An un-grooved restrained joint pipe system with visibility gap to view the restraining member

Abstract

A pipe system consists of a pipe (10) with a flared portion (16) extending inwardly from a radial retention wall (14) to the spigot end (12). The flared portion (16) features a mating surface (17) larger than the pipe’s (10) outer surface (15). The receptacle body (40) has a reception end (42) from where a clear bore (43) extends into a key groove (48), followed by a containing bore (56) to contain the flared portion (16). A locking device (80) accommodates inside the key groove (48) sandwiching between the pipe's retention wall (14) and the receptacle's retention wall (51) in a coupled state. The derived visibility gap (45) permits viewing of the pipe retention wall (14) from the reception end (42) while the pipe (10) is inserted until the system is uncoupled and subsequently gives a view of the locking device (80) when the system is coupled, ensuring secure connection (Refer FIG. 4).

Description

TECHNICAL FIELDThe present subject matter described herein, in general, relates to a specializedcomponent of a pipe system that is used in the context of fluid mechanics or pipingtechnology. Specifically, it outlines the design and function of a couplingmechanism between two pipe segments, which includes geometries, lockingaspects, and visibility features involved in their connection.BACKGROUNDBackground description includes information that may be useful in understandingthe present invention. It is not an admission that any of the information providedherein is prior art or relevant to the presently claimed invention, or that anypublication specifically or implicitly referenced in prior art.For a long duration, the art has been aware of joining pipes by employing restrainingdevices, enabling quick and easy assembly by inserting the grooved end of oneconduit (the male member) into the opening of another conduit (the femalemember). Such restrained joint pipe systems are commonly used in irrigation,mining, and borewells in developed countries, where pipes typically have thickerwalls due to a higher safety factor affordable by users. The increased wall thicknessis necessary to create a groove of sufficient depth in the male conduit. However,this necessity for thicker walls poses a limitation in India, where increasing wallthickness solely to derive a restraining groove is not economically practical.Moreover, cutting a groove into the pipe reduces its ability to withstand internalpressures and axial tensile forces, because the pipe wall is thinner at the groove.This weakness is particularly problematic when the system is installed verticallyfor extended lengths, as in borewell water risers, where the grooved joints can crackand separate under pressure.Additionally, grooving polymer pipes, such as those made from polyethylene orpolypropylene, is particularly challenging because the pipe tends to wobble on alathe, complicating the grooving process.A significant drawback of existing restrain joint pipe systems is the inability toverify the engagement of the restraining member inside the receiving pipe once themale pipe is inserted. When employing a snap acting restrainer, this poses aconsiderable risk of incomplete assembly, where the male pipe may not be inserteddeeply enough for restrainer to snap and engage properly, or the restrainer mightfail to snap due to obstruction or damage, without any visual confirmation for theuser. When employing a spline restrainer, a user may mistakenly insert a shorterspline which may engage with only a portion of the retention wall, resultantly thejoint doesn't realize its fuller potential. When employing an interlocking-ends splitring restrainer, the restrainer in a locked state may achieve a diameter not radiallycovering the whole retention wall thereby resulting in a weaker than realizable jointstrength.Also, during dis-assembly of the restrained pipe system, the restraining membersoften fail to un-couple and get jammed in the key groove due to sand and dustclogging.Given these limitations, threaded joint systems are currently more popular in indiathan restrained joint systems, even though they require more time for installation,removal, and reinstallation. However, threaded joints are susceptible to decouplingif the fluid flow creates rotational thrust inside the water pump, causing the threadedpipes to unscrew. While various attempts have been made to include wire-locks orother mechanisms to counteract this thrust, these solutions have often beencommercially expensive.Therefore, there is a clear need for a new restrained joint conduit system that notonly improves the strength realized from the male conduit elements but also allowsusers to visually confirm the engagement of the restraining device, ensuring theintegrity of the joint and preventing failures.SUMMARYThe following presents a simplified summary of the subject matter in order toprovide a basic understanding of some aspects of subject matter embodiments. Thissummary is not an extensive overview of the subject matter. It is not intended toidentify key / critical elements of the embodiments or to delineate the scope of thesubject matter. Its sole purpose is to present some concepts of the subject matter ina simplified form as a prelude to the more detailed description that is presentedlater.A pipe system comprises a pipe with an axis, a spigot end, an outer surface, asmooth bore, and a flared portion extending axially inward from the spigot end toa radial pipe retention wall. The flared portion includes a mating surface positionedadjacent to the pipe retention wall and has a diameter greater than that of the outersurface. A receptacle body with an axis and a reception end is also part of thesystem. The system features a clear bore that extends inward from the reception endup to a key groove, situated between a receptacle retention wall toward the clearbore and an opposite sidewall. Additionally, there is a containing bore extendingaxially from the opposite sidewall into the interior of the receptacle body toaccommodate the flared portion both axially and radially. A visibility gap in theinner periphery of the clear bore is formed when the pipe retention wall enters theclear bore during insertion of the pipe. This visibility gap provides a view of thepipe retention wall from the reception end until the assembly is in an uncoupledstate. Furthermore, a locking device located in the key groove, comprising a leadingedge toward the receptacle retention wall and an oppositely disposed trailing edge,is positioned to be sandwiched between the pipe retention wall and the receptacleretention wall to couple the assembly. The visibility gap also provides a view of thelocking device when the system is coupled.In an embodiment, the clear bore includes a chamfer at the reception end to enhancevisibility. The locking device is a split ring with interlocking ends, designed to bepre-positioned in the key groove before inserting the pipe into the receptacle body.This split ring features a locking profile at one end and a complementary lockingprofile at the other end. W hen placed in the key groove in a relaxed state, the inneredge of the split ring has a diameter equal to or greater than that of the matingsurface of the pipe. Upon interlocking the locking profile and complementarylocking profile, the inner edge contracts to a diameter smaller than that of the matingsurface.In one embodiment, the locking device is a flexible spline made from resilient andflexible plastic materials, such as nylon. This spline-type locking device is insertedinto the key groove opening after the complete insertion of the pipe's flared portioninto the containing bore of the receptacle body. Another embodiment of the pipesystem includes a snap-acting locking device that is pre-positioned in the keygroove before inserting the pipe. In the uncoupled assembly of the pipe system, theinner diameter of the snap-acting locking device's trailing edge is smaller than thatof the pipe's mating surface. As the pipe is inserted, the locking device graduallyexpands, allowing the flared portion to enter the containing bore. Once the flaredportion is fully inside the containing bore, the locking device contracts, securingthe flared portion within and locking the assembly. Additionally, in oneembodiment, the locking device is a snap-acting split ring with an inner edgealigned linearly with the axis of the receptacle body.In one embodiment, the split ring locking device features a chamfer on its leadingedge, positioned towards the reception end within the inner periphery. This designenhances functionality during assembly. Another embodiment of the split ringlocking device involves an incomplete circumference with radial extensions at itsends. These extensions protrude outward from an opening in the receptacle body'skey groove. When these radial extensions are separated, the split ring expands,allowing its inner edge to exceed the diameter of the pipe's mating surface.Additionally, in another embodiment, the split ring locking device's ends overlapcircumferentially and include radial extensions protruding from the key grooveopening. By squeezing these radial extensions together, the locking device expands,enabling its inner edge to reach a diameter larger than that of the pipe's matingsurface.In one embodiment, the snap-acting locking device features a rhomboidal crosssection.The inner and outer edges taper inward towards the trailing edge, creatinga frusto-conical configuration for the portion of the locking ring inside the keygroove. Another embodiment involves a snap-acting split ring that fits entirelywithin the key groove. The leading edge has a maximum radial size equal to orgreater than the diameter of the key groove. This ensures that when placed in thekey groove, the outer rim of the leading edge contacts the base of the key groove,forming a corresponding circular shape.In one embodiment, the split ring locking device includes a catch member extendingon the outer periphery of the leading edge. The receptacle body's key groove isdesigned with a deep section adjacent to the receptacle retention wall to capture thecatch member. This design limits axial movement of the locking device and triggersimmediate expansion upon being pushed by the spigot end during pipe insertioninto the receptacle body. Another embodiment features a snap-acting lockingdevice consisting of an arcuate band. The outer diameter of the leading edgematches or exceeds that of the key groove. Thus, when the locking ring device isplaced within the key groove, the outer rim of the leading edge contacts the base ofthe key groove, forming a corresponding circular shape. Additionally, in oneembodiment of the pipe system, there is a tubular push key with a bore, an insertionend, an oppositely disposed gripping end, and a raised surface extending axiallyfrom the insertion end on the outer surface of the push key. The bore is mountableon the outer surface of the pipe, and the raised surface has a diameter equal to orgreater than that of the pipe's mating surface. After inserting the push key into thevisibility gap of a coupled assembly from its insertion end, the locking deviceexpands within the key groove, causing the system to decouple.In one embodiment, the flared portion of the pipe includes a limiting shoulder thattapers inwardly from the mating surface to a second mating surface.Correspondingly, the containing bore of the receptacle body features a co-matingsurface and a second co-mating surface. These are designed to accommodate themating surface and the second mating surface of the pipe, respectively, separatedby a co-limiting shoulder. The insertion of the pipe into the receptacle body isrestricted by the contact between the limiting shoulder of the pipe and the colimitingshoulder of the receptacle body. Another embodiment includes acontaining bore that incorporates a pressure-activated gasket housed within apressure gasket groove positioned deeper within the receptacle body after thesecond co-mating surface. Axially following this is an expanded surface with adiameter larger than the second mating surface of the pipe. This arrangementfacilitates a fluid channel to operate the pressure-activated gasket when theassembly is locked. Furthermore, in one embodiment, the co-limiting shoulder istapered towards the axis of the receptacle body.In one embodiment, the pipe system includes a seal groove that houses acompressible sealing ring positioned on the second mating surface of the pipe.When the assembly is coupled, the sealing ring remains compressed against thesecond co-mating surface, effectively sealing the fluid between the pipe and thereceptacle body. Additionally, in another embodiment, the pipe system features oneor more thrust ribs extending axially from the interior of the containing boretowards the reception end. The pipe is equipped with a thrust slot corresponding toeach rib. As the pipe is inserted into the receptacle body, each thrust rib fits into itsrespective thrust slot. This arrangement ensures proper alignment and a secureconnection between the pipe and the receptacle body.In one embodiment, a seal groove containing a sealing ring is positioned on thesecond mating surface of the pipe. A co-limiting shoulder within the containingbore engages with the sealing ring after each thrust rib is located inside itsrespective thrust slot. This arrangement ensures proper sealing in the coupledassembly. Another embodiment of the pipe system includes a seal groove situatedin the containing bore of the receptacle body. This groove houses a compressiblesealing ring that, in a coupled assembly, remains compressed against the flaredportion of the pipe to create a fluid seal. In another embodiment, the pipe systemfeatures a non-engagement surface extending axially from the spigot end of thepipe. This surface has a diameter smaller than the inner diameter of a sealing ringlocated in a seal groove within the containing bore of the receptacle body.Following the non-engagement surface is a tapered seal engagement shoulder. Thelength of the non-engagement surface is designed so that the seal engagementshoulder engages with the sealing ring after each thrust rib is positioned inside itsrespective thrust slot during the insertion of the pipe.In one embodiment, the flared portion of the pipe is formed by attaching a flaringdevice to the pipe end. The flaring device is a tubular body that includes a spigotend, an oppositely disposed joining end, and a flared portion extending from thespigot end to a pipe retention wall. A bore extends axially inward from the joiningend of the flaring device to attach with the outer surface of the pipe. In anotherembodiment, the pipe retention wall is positioned at the joining end of the flaringdevice. Furthermore, in another embodiment, the pipe retention wall and the joiningend are separated by an extended surface. In another aspect of the pipe system, theflaring device and the outer surface of the pipe are both made from a polyolefinmaterial, such as polypropylene or polyethylene. This material compatibilityfacilitates heat fusion between the bore of the flaring device and the outer surfaceof the pipe. Additionally, in another embodiment, the polyolefin material used forthe flaring device may be reinforced with additives such as glass fiber or carbonfiber. These reinforcements help prevent decoupling caused by deformation of thepipe retention wall due to cold flow.In one embodiment, the pipe and the flaring device are manufactured separately,and then the bore and outer surface are heat fused together to form a secureconnection. In another embodiment, the flaring device is over-molded onto theouter surface adjacent to the pipe end, creating a seamless integration. In anotherscenario, the pipe and the flaring device are both made from PVC (Polyvinylchloride), and the bore and outer surface are solvent welded together for a strongbond. Alternatively, in another embodiment, the pipe and the flaring device can bemade from rigid materials such as metal or PVC, and the bore and outer surface arethreadedly attached to each other for assembly. In another aspect, in oneembodiment, at least a portion of the locking device that is visible from the visibilitygap is colored differently from the surfaces of other system components visiblewithin the visibility gap. This color contrast helps in identifying and distinguishingthe locking device during assembly and maintenance operations.BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGSThe foregoing and further objects, features, and advantages of the present subjectmatter will become apparent from the following description of exemplaryembodiments with reference to the accompanying drawings, wherein numerals areused to represent like elements.It is to be noted, however, that the appended drawings illustrate only typicalembodiments of the present subject matter, and are, therefore, not to be consideredfor limiting of its scope, for the subject matter may admit to other equally effectiveembodiments.FIG. 1 illustrates a top, cross-sectional side view of an embodiment of the pipesystem at the onset of insertion of the pipe 10 from its spigot end 12 inside the clearbore 43 of the receptacle body 40.FIG. 2 illustrates a top, cross-sectional side view of the embodiment of Fig. 1 in anintermediate stage of insertion of the pipe 10 inside the receptacle body 40.FIG. 3 illustrates a top, cross-sectional side view of the embodiment of Fig. 1 in alocked state with the visibility gap 45.FIG. 4 illustrates a sectioned isometric view of the assembly of Fig. 3.FIG. 5 illustrates a perspective view of the locking ring device 80 of theembodiment of Fig. 1FIG. 5a illustrates an axial end view of the assembly of Fig. 3 sectioned at the keygroove 48 showing the locking ring device 80 in an expanded state.FIG. 5b illustrates an axial end view of the assembly of Fig. 4 sectioned at the keygroove 48 showing the locking ring device 80 in a locked state.FIG. 6 illustrates a top, cross-sectional side view of an embodiment at the onset ofinsertion of the pipe 10A inside the receptacle body 40A.FIG. 7 illustrates a top, cross-sectional side view of the embodiment of Fig. 6 in alocked state showing a push key 70A mounted on the pipe 10A ready for insertionin the visibility gap 45A.FIG. 8 illustrates a top, sectional side view of the embodiment of Fig. 6 showingthe locking ring device 80A expanded by insertion of the push key 70A inside thevisibility gap 45A.FIG. 9 illustrates a perspective view of the push key 70A of the embodiment of Fig.7.FIG. 9a illustrates a perspective view of the push key 70A of the embodiment ofFig. 7 expanded by enlarging the gap in the discontinuity 76A for side mounting onthe pipe 10A.FIG. 10 illustrates a perspective view of an alternate embodiment of a locking ringdevice 80B.FIG. 10a illustrates an axial end view sectioned at the key groove 48B of theembodiment of the pipe system containing the locking ring device 80B of Fig. 10in a locked state.FIG. 10b illustrates an axial end view of the embodiment of Fig. 10a sectioned atthe key groove 48B showing the locking ring device 80B in an expanded stateachieved by pushing apart radial extensions 87B and 89B.FIG. 11 illustrates a perspective view of an alternate embodiment of a locking ringdevice 80C.FIG. 11a illustrates an axial end view sectioned at the key groove 48C of theembodiment of the pipe system containing the locking ring device 80C of Fig. 11in a locked state.FIG. 11b illustrates an axial end view of the embodiment of Fig. 11a sectioned atthe key groove 48C showing the locking ring device 80C in an expanded stateachieved by squeezing together radial extensions 87C and 89C.FIG. 12 illustrates a top, sectional side view of an embodiment of pipe 10C wherea flaring device 30C is threadingly affixed on the pipe 10C.FIG. 13 illustrates an exploded view of an embodiment of the pipe system withvarious conduit bodies like bends, tees, and adapters.FIG. 14 illustrates a top, sectional side view of and embodiment of pipe system inlocked state where the Flaring device 30D comprises an extended surface 34D formore reliable attachment and a push key 70D located outside the visibility gap 45D.FIG. 15 illustrates a top, sectional side view of the embodiment of Fig. 14 showingthe locking ring device 80D expanded by insertion of the push key 70D inside thevisibility gap 45D.FIGS. 16 and 16a illustrate a top, sectional side view of an embodiment of the pipesystem with a rhomboidal cross-section locking ring device 80E installed inside keygroove 48E.FIG. 17 illustrates a perspective view of the rhomboidal locking ring device 80Eof Fig. 16 before its placement inside the key groove 48E.FIG. 18 illustrates a perspective view of the receptacle body 40E of the assemblyof Fig. 16 sectioned at the key groove 48E with an opening 53E for insertion oflocking ring device 80E.FIG. 19 illustrates a top, sectional side view of the embodiment of Fig. 16 showinginsertion of spigot end 12E causing expansion of the locking ring 80E.FIG. 20 illustrates a top, sectional side view of the embodiment of Fig. 16 showingthe complete expansion of he locking device 80E within the key groove 48E.FIG. 21 illustrates a top, sectional view of the embodiment of Fig. 16in a lockedstate.FIG. 22 illustrates a perspective view of the assembly of Fig. 21 showing thelocking ring device 80E with an end 88E protruding outside for its withdrawal.FIG. 23 illustrates a top, sectional side view of an embodiment of Fig. 21 showingthe push key 70E expanding locking ring 80E to facilitate pipe withdrawal.FIG. 24 illustrates a perspective view an alternate embodiment of a rhomboidallocking ring device 80F with a flattened portion 92F interrupting between its overallcurved structure.FIG. 25 illustrates a perspective view sectioned at the key groove 48F of anembodiment of the pipe system with the locking ring device 80F of Fig. 24 locatedinside the key groove 48F.FIGS. 26 and 26a illustrates a top, sectional side view of an embodiment of thepipe system comprising a deep groove 55G in the key groove 48G to contain a catchmember 91G on the locking ring device 80G.FIG. 27 and 27a illustrate a top, sectional side view of the embodiment of Fig. 26wherein the spigot end 12G pushes the inner edge 83G of the frusto-conical lockingring 80G to start expanding the locking ring device 80G.FIG. 28 illustrates a sectional view of the key groove 48G of the embodiment ofFig. 26 showing the fully expanded locking ring device 80G and the mating surface17G enters the containing bore 57G.FIG. 29 illustrates a top, sectional side view of the embodiment of Fig. 26 in alocked state.FIG. 30 illustrates a top, sectional side view of an embodiment of the pipe systemat the onset of insertion of the pipe 10H comprising a limiting surface 18H insidethe receptacle body 40H comprising a co-limiting surface 58H.FIG. 31 illustrates a top, sectional side view of the embodiment of Fig. 30 whereinthe inner edge 83H of the locking ring 80H attains a larger radial size to climb onthe second mating surface 19H.FIGS. 32 and 32a illustrate a top, sectional side view of the pipe system of Fig. 30wherein the inner edge 83H of the locking ring 80H expands further over the sealingring 24H.FIG. 33 illustrates a top, sectional side view of the pipe system of Fig. 30 whereinthe locking ring 80H achieves maximum expansion for insertion of the matingsurface 17H inside the containing portion 56H of the receptacle body 40H.FIG. 34 illustrates a sectional view of the pipe system of Fig. 30 in a locked / assembled / operative state.FIG. 35 illustrate a top, sectional side view of an embodiment of the pipe systemwith a sealing ring 61I on the second co-mating surface 59I, and a locking ring 80Ifeaturing a chamfer 85I for smoother interaction with the sealing ring 24I and thelimiting shoulder 18I during insertion.FIGS. 36-37 show a top sectional side view of an embodiment of the pipe systemcomprising a rhomboidal locking ring 80J wherein the tapered inner edge 83Jenables smooth engagement with the sealing ring 24J and the limiting shoulder 18Jon the pipe 10J.FIG. 38 illustrates a cross-sectional perspective view of a receptacle body 40K ofan embodiment where the receptacle body 40K includes thrust ribs 66K extendingin the containing bore 56K towards the reception end 42K.FIGS. 39 illustrates a perspective view of an embodiment of the pipe 10K suitablefor the embodiment of the receptacle body 40K of Fig. 38 showing the spigot end12K of the pipe 10K featuring a thrust slot 26K for each thrust rib 66K.FIG. 40 provides a sectional sideview of the embodiment of pipe 10K of Fig. 39.FIG. 41 illustrates a sectional view of an embodiment formed by bodies illustratedin Figs. 38-40 showing each thrust rib 66K interlocked with its corresponding thrustslot 26K before engagement of sealing ring 61K with the engagement shoulder 20Kduring insertion of pipe 10K in the receptacle body 40K.FIG. 42 illustrates a sectional view of the embodiment of Fig. 41 in a locked state.FIG. 43 illustrates an embodiment in locked state where a flaring device 30Lcontaining thrust slots 26L is attached on the pipe 10L.FIG. 44 illustrates a sectional sideview of the receptacle body 40M of anembodiment where the receptacle body 40M contains thrust slots 66M and colimitingsurface 58M.FIG. 45 illustrates a sectional sideview of the pipe 10M suitable for the receptaclebody 40M of the embodiment of Fig. 44.FIG. 46 and 46a illustrate a sectional sideview of the embodiment formed bybodies illustrated in Figs. 44-45 in an intermediate stage of insertion of pipe 10Min the receptacle body 40M where each thrust rib 66K gets interlocked with itscorresponding thrust slot 26M before engagement of sealing ring 24M with the colimitingshoulder 58M.FIG. 47 illustrates cross-sectional side view of the embodiment of Fig. 46 with allcomponents in a locked state.FIG. 48 illustrates an alternative embodiment of the split ring locking device 80Nwith interlocking ends, including locking profiles 93N and 94N, and radialextensions 87N and 89N.FIG. 49 illustrates an axial end view of an embodiment in an intermediate stage ofinsertion of a pipe 10N in a receptacle body 40N, sectioned at the key groove 48Nwith a pre-positioned locking device 80N of Fig. 48 during an.FIG. 50 illustrates an axial end view of the embodiment of Fig. 49 in a locked statesectioned at the key groove 48N.FIG. 51 illustrates a perspective view of the assembly of Fig. 50 highlighting thevisibility gap 45N, showing how the locking device 80N appears when properlyengaged and coupled.FIG. 52 illustrates an embodiment of a locking device 80P constructed as a splineband with a resilient plastic composition..FIG. 53 illustrates an embodiment sectioned at the key groove 48P where thespline-type locking device 80P of Fig. 52 is inserted into the key groove 48P afterthe flared portion 16P of the pipe 10P is positioned within the containing bore 52Pof the receptacle body 40P.FIG. 54 illustrates a top, cross-sectional side view illustrating the spline-typelocking device 80P positioned in the key groove 48P, serving as a barrier againstpipe 10P withdrawal.FIG. 55 illustrates the visibility gap 45P in a perspective view of the assembly ofFig. 54, providing a clear view of the spline-type locking device 80P to ensureproper assembly and prevent inadvertent locking errors.DETAILED DESCRIPTIONThe following presents a detailed description of various embodiments of the presentsubject matter with reference to the accompanying drawings.The embodiments of the present subject matter are described in detail withreference to the accompanying drawings. However, the present subject matter is notlimited to these embodiments which are only provided to explain more clearly thepresent subject matter to a person skilled in the art of the present disclosure. In theaccompanying drawings, reference numerals are used to indicate like components.The specification may refer to "an", "one", "different" or "some" embodiment(s)in several locations. This does not necessarily imply that each such reference is tothe same embodiment(s), or that the feature only applies to a single embodiment.Single features of different embodiments may also be combined to provide otherembodiments.As used herein, the singular forms "a", "an" and "the" are intended to include theplural forms as well, unless expressly stated otherwise. It will be further understoodthat the terms "includes", "comprises", "including" and / or "comprising" when usedin this specification, specify the presence of stated features, integers, steps,operations, elements, and / or components, but do not preclude the presence oraddition of one or more other features, integers, steps, operations, elements,components, and / or groups thereof. It will be understood that when an element isreferred to as being "attached" or "connected" or "coupled" or "mounted" toanother element, it can be directly attached or connected or coupled to the otherelement or intervening elements may be present. As used herein, the term "and / or"includes any and all combinations and arrangements of one or more of theassociated listed items.The figures depict a simplified structure only showing some elements andfunctional entities, all being logical units whose implementation may differ fromwhat is shown.The figures depict a simplified structure only showing some elements andfunctional entities, all being logical units whose implementation may differ fromwhat is shown.The embodiments of the currently disclosed pipe system include conduit bodies ofvarious shapes, like straight, L-shaped, T-shaped or Y-shaped and can havemultiple inlet outlet points, ends of which are joined in a male-female fashion.While joining two conduit bodies together, the body providing a male joining end,referred to as the pipe 10, (FIGS. 1-5), has a centre axis 11, a spigot end 12, asmooth bore 25 and an outer surface 15 of substantially constant diameter. A flaredportion 16 axially extends from the spigot end 12 to a radial pipe retention wall 14.This flared portion 16 can comprise a mating surface 17 positioned adjacent to thepipe retention wall 14 linearly extending therefrom towards the spigot end 12having a diameter more than that of the outer surface 15.The flared portion 16 can be produced monolithically (a single, seamless piece asshown in FIG. 1) during injection moulding of the pipe 10. In other embodiments,a flared portion 16A can be comprised on pipe 10A by attaching a flaring device30A at an end 13A of the pipe 10A by various methods (FIG. 6,12) at the factory.This ensures that the flaring device 30A is an integral component of pipe 10A whenit is delivered to the user for field assembly.The current system also comprises a receptacle body 40 (FIG. 1-4), a conduit bodyof the pipe system providing the female end as noted before, having a centre axis41, a reception end 42 at the axial end and a clear bore 43 extending from thereception end 42 and up to a key groove 48.The key groove 48 can confine between a receptacle retention wall 51 towards theclear bore 43 and an opposite sidewall 52. The receptacle body 40 comprises acontaining bore 56, extending further axially inside the receptacle body 40 from thekey groove 48 for a length at least equal to the length of the flared portion 16 of thepipe 10, such that the flared portion 16 of the pipe 10 can fit entirely inside thecontaining bore 56 of the receptacle body 40.The containing bore 56 contains a co-mating surface 57, whose diameter is onlymarginally greater than that of the mating surface 17. This design allows the flaredportion 16 to fit snugly inside the containing bore 56, (FIG. 3) thereby maintainingthe pipe 10 fairly coaxial with the receptacle body 40.To couple the assembly, the pipe 10 is inserted from its spigot end 12 inside thereceptacle body's 40 clear bore 43. During insertion, when the pipe retention wall14 enters the clear bore 43, users will observe a radial visibility gap 45 inside theclear bore 43 at the reception end 42 of the receptacle body 40 (FIG. 2-4). Users ofthe system get a sight of the retention wall 14 from the visibility gap 45 till the timethe assembly has not attained a locked configuration. (Fig. 2).In a locked state of the assembly, a locking device 80 is positionable inside the keygroove 48 to be sandwiched between the receptacle retention wall 51 and the piperetention wall 14 to prohibit the axial withdrawal of the pipe 10 from the receptaclebody 40. (Fig. 3) In an embodiment, the locking device comprises a leading edge81 towards and for abutment with the receptacle retention wall 51, and anoppositely disposed trailing edge 82 for abutment with the pipe retention wall 14.In such a locked state of the assembly, the view of the pipe retention wall 14 in thevisibility gap 45 is replaced by a view of the locking device 80 indicating a positivelocking state (FIG 3,4).In some versions, the locking device 80 can be a snap acting one, which is prepositioned(Fig. 1) in the key groove 48 and composed of a material with elasticmemory to allow its expansion and retraction. The leading edge 81 and trailing edge82 are connected by an inner edge 83 and outer edge 84. In an uncoupled assembly,the size of the opening of the trailing edge 81, i.e. the inner diameter of the trailingedge 81, of the relaxed snap acting locking device 80, is less than the diameter ofthe mating surface 17 on the pipe 10. The snap acting locking device 80 expandswhen stressed upon by the spigot end 12 during insertion of the pipe 10 (Fig. 2)gradually mounting its inner edge 83 on the mating surface 17 of the pipe 10. Thekey groove 48 is configured to accommodate the increased radial size of the lockingdevice 80 (Fig. 2,5a). This expansion of the locking device 80 permits the entry ofthe flared portion 16 inside the containing bore 56 of the receptacle body 40, afterwhich, the snap acting locking device 80 quickly contracts to an operative state,while destressing back to assume its relaxed state, such that, the inner diameter ofthe trailing edge 81 snaps to a size less than the diameter of the mating surface 17of the pipe 10 (Fig. 3,4) and the assembly attains a locked configuration.Consequently, in the event of axial tensile forces attempting to dislodge the pipe 10from the receptacle body 40, the split ring locking ring 80 is sandwiched betweenthe pipe retention wall 14 and the receptacle retention wall 51 of the receptacle body40, which effectively secures the flared portion 16 of the pipe 10 within thecontaining bore 56 of the receptacle body 40.In one version, the snap acting locking device 80 (FIG. 5), is a split ring and haveends 86 and 88 wherein the split ring is discontinuous between them. In someembodiments, the snap acting locking device 80 has an inner edge 83 that is linear(Fig. 1), such that, upon interaction with the spigot end 12, the entire locking device80 expands i.e. both the leading edge 81 and the trailing edge 82 expandsimultaneously (Fig. 2). In a version, the split ring locking device 80 includesmultiple spacers 90 (FIGS. 5, 5b) positioned along its outer edge 84 to maintain aco-axial alignment of the split ring locking ring 80 within the key groove 48.In some versions, a chamfer 22 is located on the outer periphery of the spigot end12. When the pipe 10 is inserted into the receptacle body 40 through the clear bore43, the chamfer 22 presses against the inner edge 83 (FIG. 1). This action facilitatesa smooth engagement between the spigot end 12 and the split ring locking ring 80,converting the axial movement of the pipe 10 into a radial displacement across theentire split ring locking ring 80.In an embodiment, a seal groove 60 (FIG. 3) within the co-mating surface 57 of thereceptacle body 40 houses a compressible elastomeric sealing ring 61. When theflared portion 16 of the pipe 10 is secured inside the containing bore 56, the matingsurface 17 of the flared portion 16 compresses the sealing ring 61, ensuring a fluid10tight seal.In a version, the receptacle body 40 comprises an end surface 65 (FIG. 1-3) at theend of the containing bore 56 to narrow down the bore of the receptacle conduitbody 40 such that the spigot end 12 of the pipe 10 abuts with the end surface 65.During insertion of the pipe 10, when the containing bore 56 of the receptacle body40 comprises a seal groove 60, it becomes crucial to limit the insertion depth of thespigot end 12 of the pipe 10 into the receptacle body 40 to prevent the pipe retentionwall 14 from inadvertently axially reaching beyond the depth of the seal groove 60within the containing bore 56 thus ensuring that a fluid seal is continuously realized.Such insertion limitation is provided by the end surface 65 of the receptacle body40 in this embodiment. Various alternative methods for limiting the insertion depthcan be utilized (FIG. 25-42), which will be detailed in the following embodiments.In other embodiments, the receptacle body 40 does not comprise a seal groove 60and the sealing ring 61, eliminating the need to limit the insertion of the pipe 10inside the receptacle body 40, not shown by drawings. Therefore, those versions ofthe receptacle body 40 can comprise no end surface 65.To augment the view of the locking device 80 from the visibility gap 45 forascertaining the integrity of the joint, in some embodiments, atleast a portion of thelocking device 80 visible from the visibility gap 45 has a colour distinct from thecolour of the pipe 10 and the receptacle body 40. In some embodiments, the wholelocking device 80 has a distinct colour from the colour of the pipe 10 and thereceptacle 40.An embodiment of the system comprises a visibility enhancement chamfer 44(FIGS. 3) located in the clear bore 43 of the receptacle body 40, adjacent to thereception end 42. This chamfer 44 increases the visibility span of interior of thereceptacle body 40 for the users. Other versions (Fig. 7) comprise no such visibilityenhancement chamfer 44. Instead, the combination of the length of the clear bore43A and the diameter of the outer surface 15A of the pipe 10A provides for a clearview of the split ring locking ring 80A from the visibility gap 45A without requiringthe visibility enhancement chamfer 44A.In an embodiment, the snap acting split ring locking device 80A has a chamfer 85Alocated at the inner periphery of the leading edge 81A, (FIG. 6-8) facing thereception end 42A to facilitate smooth interaction with the spigot end 12A of thepipe 10A.An embodiment of the pipe system (FIGS. 7-8) includes a chamfer 85A in the splitring locking ring 80A and a push key 70A of a tubular structure. The tubular pushkey 70A has an insertion end 71A, an oppositely disposed gripping end 74A and abore 77A having a constant size only slightly larger than the outer surface 15A ofthe pipe 10A. A raised surface 73A, with a diameter at least equal to that of themating surface 17A, extends along the outer portion of the push key 70A from itsinsertion end 71A. This raised surface 73A is designed to be of a length such that,when inserted into the visibility gap 45A of a locked assembly (FIG. 8), theinsertion end 71A penetrates the receptacle body 40A to a depth sufficient to pressagainst the chamfer 85A of the split ring locking ring 80A. This action graduallyexpands the split ring locking device 80A, causing its inner edge 83A to expandand mount on the raised surface 73A, thereby allowing the pipe 10A to bewithdrawn from the receptacle body 40A.In another version, the push key 70A includes a gripping profile 75A (FIG. 8)positioned adjacent to the gripping end 74A to provide a grip for manually holdingthe push key 70A when unlocking the system.As previously noted, in an embodiment of the pipe system (FIG. 6), a pipe 10A ismanufactured in stages and not monolithically. A pipe 10A with an outer surface15A adjacent to its end 13A, is manufactured in a first step without the flaredportion 16A. In a second step, a flaring device 30A having a tubular structure isattached on the outer surface 15A at the end 13A of the pipe 10A to provide theflared portion 16A, such that the flaring device 30A becomes an integral part of thepipe 10A.An embodiment of a flaring device 30A (FIG. 6) comprises a joining end 33A andan opposite end, which serves as the spigot end 12A of the pipe 10A, and a bore31A extending axially inward from the joining end 33A and ends at a bore end 32Abefore the spigot end 12A of the flaring device 30A. The bore 31A is configuredand sized to receive the end 13A of the pipe 10A and join with its outer surface15A. A flared portion 16A is comprised on the flaring device 30A extendingbetween the spigot end 12A and the pipe retention wall 14A. In an embodiment, thepipe retention wall 14A can be located at the joining end 33A.In an embodiment of the pipe 10A, the flaring device 30A and atleast the outersurface 15A of the pipe 10A is manufactured from the same polyolefin material likepolyethylene and polypropylene facilitating heat fusion between the bore 31A ofthe flaring device 30A with the outer surface 15A of the pipe 10A. Polyolefinproducts have a tendency to gradually deform when subjected to mechanical stress,a phenomenon known as cold flow. In an embodiment of the flaring device 30A,the polyolefin material used for making the flaring device 30A is reinforced withagents including, but not limited to, glass fibre and carbon fibre to prevent itsdeformation due to cold flow.In an embodiment of the pipe 10A, the flaring device 30A and the pipe 10A aremanufactured separately of the same polyolefin material and the bore 31A of theflaring device 30A are heat fused together in a second step. In another embodimentalso illustrated from Fig. 6, the pipe 10A is made of a polyolefin material likepolyethylene or polypropylene and a flaring device 30A of the same polyolefinmaterial as the pipe 10A is over-moulded at the end 13A of the pipe 10A. Thiswould eliminate an additional step of separately manufacturing the flaring device30A and then heat fusing it at the end 13A of the pipe 10A. Rather, the flaringdevice 30A at the time of its manufacturing, simultaneously gets attached at the end13A of the pipe 10A leading to cost and time savings and also ensures aninseparable attachment between the flaring device 30A and the pipe 10A.While, in yet another embodiment also illustrated from Fig. 6, the pipe 10A and theflaring device 30A are manufactured separately from PVC material in a first stepfollowed by the fusion of the bore 31A and the outer surface 15A adjacent to theend 13A of the pipe 10A by a solvent adhesive.In another version, the tubular push key 70A includes a single discontinuity 76A(FIG. 9) such that the push key 70A is mounted on a pipe 10A in the field byenlarging the gap in the discontinuity 76A (FIG. 9a) to a size equal or greater thanthe diameter of the outer surface 15A of the pipe 10A.In another embodiment, the push key 70A does not comprise the discontinuity 76Aand the attachment of flaring device 30A on the pipe 10A is done after slidinglymounting the push key 70A on the pipe 10A. Thereby, the push key becomes anintegral part of the pipe 10A.In one version (FIG. 10, 10a), the snap acting split ring locking device 80B featuresradial extensions 87B & 89B extending from ends 86B and 88B, respectively,protruding outside the receptacle body 40B through an opening 53B. To unlock anassembly, the users space apart the radial extensions 87B and 89B from each other(FIG. 10b), such that the split ring locking device 80B gradually enlarges to amaximum radial size possible inside the key groove 48B. Consequently, inner edge83B attains a diameter greater than that of the mating surface 17B, permitting theaxial withdrawal of the pipe 10B from the receptacle body 40B.In some embodiments of the receptacle 40B, the opening 53B features a stopmember 54B to trap a radial extension 89B (FIG. 10b) in a portion of the opening53B, such that the user is enabled to push away only the other radial extension 87Bto expand the split ring locking ring 80B.In another version (FIG. 11, 11a), the snap-acting split ring locking device 80Cfeatures circumferentially overlapping ends 86C and 88C, each with radialextensions 87C and 89C. These extensions protrude visibly through an opening53C in the receptacle body 40C. When the user brings the radial extensions 87Cand 89C closer together (FIG. 11b), the split ring locking ring 80C expands to itsmaximum circular size within the key groove 48C where the diameter of the inneredge 83 is greater than that of the mating surface 17. This allows for the axialwithdrawal of the pipe 10C from the receptacle body 40C.In another embodiment (Fig. 12), the bore 31C of the flaring device 30C, hasthreading 35C for affixation with a threaded portion 28C on the outer surface 15Cadjacent to the end 13C of the pipe 10C. The flaring device 30C can bemanufactured from any rigid material for making threads on its outer surface 15C.Figure 13 shows an embodiment of the pipe system 1C in an un-coupled state. Inan embodiment of the pipe system 1C, the pipe 10C is a conduit body havingmultiple ends for example a Bend 2C acts as a pipe 10C at the spigot end 12 / 2C, aTee 3C acting as a pipe 10C at all three spigot ends 12 / 3C, a male-female pipe 5Cacting as a pipe 10C at the spigot end 12 / 5C or an extruded tube 6C acting as thepipe 10C at two spigot ends 12 / 6C. In an embodiment, the pipe 10C has a pluralityof spigot end 12C for the example, a Tee 3C, a pipe 6C. In another embodiment,the pipe 10C further comprises one or more reception ends 42C for example, aBend 2C, a straight pipe 5C.In yet another embodiment, the pipe 10C has one or more ends for joining thecurrent pipe system with another pipe system having a different joining method. Inyet another embodiment, the pipe 10C has no other end for example an end cap.In another embodiment of the pipe system, the receptacle body 40C can be a conduitbody having multiple ends, for example, a bend 2C acting as a receptacle body 40Cat reception end 42 / 2C, a female-by-female adapter 4C acting as a receptacle body40C at both its reception ends 42 / 4C, a male by female adapter 5C acting as areceptacle body 40C at reception end 42 / 5C etc. In an embodiment, the receptaclebody 40C has multiple reception ends 42C for example an adapter 4C havingreception ends 42 / 4C. In another version, the receptacle body 40C has one or morespigot end 12C for example a bend 2C, a male by female adapter 5C.In yet another embodiment, the receptacle body 40C has one or more ends forjoining with another pipe system having a different joining method. In yet anotherembodiment, the receptacle 40C has no other inlet / outlet end for example an endcap 7C.The structure of the pipe 10C and receptacle body 40C is not limited to the pipesystem 1C of Figure 13 and can be constructed with many other conduit bodies notillustrated by way of drawings and are generally available in the market for examplea Y-shape or a 4 way cross etc. It would be understood by the user that the conduitbodies illustrated in Fig. 13 has a different combination of inlet / outlet ends forexample the bend 2C can have both ends as spigot ends 12 / 2C, or both ends asreception end 42 / 2C depending on the end use requirements.In another embodiment of the flaring device 30D, illustrated in Fig. 14, the joiningend 33D and the pipe retention wall 14D are disposed at a distance from each other,separated by an extended surface 34D. This configuration provides an extendedengagement between the bore 31D and the outer surface 15D ensuring a morereliable attachment of the flaring device 30D on the pipe 10D.In another embodiment, the push key 70D comprises a slide chamfer 72D (Fig. 14)at the inner periphery of the insertion end 71D and the key bore 77D is sized tomount on the extended surface 34D. The slide chamfer 72D facilitates smoothengagement with the joining end 33D of the flaring device 30D while inserting thepush key 70D inside a locked assembly (Fig. 15).In another embodiment, the snap-acting locking device 80E has a rhomboidal crosssection(Fig. 16). Its cross-section can have a leading edge 81E, transverse to thecentre axis 41E, located towards retention wall 51E and an oppositely disposedtrailing edge 82E. An inner side wall 83E and an outer edge 84E taper inwardlyfrom the leading edge 81E towards the trailing edge 82E connecting the trailingedge 82E with the leading edge 81E. The rhomboidal locking device 80E is preinstalledinside the key groove 48E such that the installed portion attains a frustoconicalconfiguration.In a version of the rhomboidal cross-section locking device, it is an arcuate band (asection of a ring). In a pre-installed state (Fig. 17), the outer diameter of the leadingedge 81E of the rhomboidal band locking device 80E has a size not less than thatof the key groove 48E, such that upon its location inside the key groove 48E, theouter rim of the leading edge 81E sits in communication with the key groove 48E(Fig. 16) and attains a circular size and shape corresponding to the key groove 48E(Fig. 18).An embodiment of the receptacle body 40E, comprises an opening 53E (Fig. 18) tofacilitate insertion of the rhomboidal band locking device 80E from an end 86E forpositioning it inside the key groove 48E. In another embodiment, an end 88E of thelocking device 80E is left outside the receptacle body 40E (Fig. 22) for withdrawalof the locking device 80E for decoupling the system.In an un-coupled state of the assembly, when the rhomboidal locking device 80E islocated inside the key groove 48E, the mating surface 17E of the pipe 10E has adiameter greater than the inner diameter of the trailing edge 82E. Additionally, theouter diameter of the trailing edge 82E is larger than that of the co-mating surface57E of the receptacle body 40E (Fig. 16). Consequently, when the spigot end 12Eof the pipe 10E engages with the rhomboidal locking device 80E, the trailing edge82E comes into contact with the opposite side wall 52E (Fig. 16a). This preventsthe locking device 80E from moving inward into the containing bore 56E, therebyconfining it within the key groove 48E.Upon further insertion of the pipe 10E, the spigot end 12E engages with the inneredge 83E causing the enlarging of the inner rim of the trailing edge 82E of therhomboidal locking device 80E (FIG. 19). This gradual expansion allows the innerrim of the trailing edge 82E to slide over the mating surface 17E and allow entryof the flared portion 16E of the pipe 10E into the containing portion 56E (FIG. 20).When the retention wall 14E aligns with the opposite side wall 52E, the trailingedge 82E of the rhomboidal locking device 80E snaps to attain an inner diameterless than that of the mating surface 17E (FIG. 21), ensuring that the trailing edge82E abuts with the retention wall 14E when axial tensile forces attempt to dislodgethe pipe 10E from the receptacle body 40E.In another embodiment, the assembly comprises a push key 70E wherein theinsertion end 71E (FIG. 23) pushes the inner edge 83E of the rhomboidal lockingdevice 80E to expand the locking device 80E completely inside the key groove48E, facilitating the axial withdrawal of the pipe 10E from the receptacle body 40E.In another embodiment, the rhomboidal cross-section locking device 80F is a splitring, where the arc length of the outer rim of the leading edge 81F is no greater thanthe circumference of the key groove 48F (FIG. 24). This design allows the lockingdevice 80F to be inserted into the key groove 48F from the clear bore 43F and sitentirely within the key groove 48F (FIG. 25). Additionally, the maximum radiallength 97E of the locking device 80E is not less than the diameter of the key groove48E. In some versions, the locking device 80F comprises a flattened portion 92F(FIG. 24) interrupting between the overall curved structure of the locking device80F, such that the locking device 80F is compressed for insertion inside the keygroove 48F, re-expands to attain a circular shape corresponding to the key groove48F, and sits completely inside the key groove 48F after insertion from the clearbore 43F.Persons skilled in the art will realize that versions of the current system be formedsuch that the locking device 80F comprises no flattened portion 92F and the outerradius of the leading edge 81F of the locking device 80F is equal or greater thanthe radius of the key groove 48F to make the leading edge 81F attain a circularshape corresponding to the key groove 48F.In another embodiment the key groove 48G of the receptacle body 40G comprisesa deep groove 55G (FIG. 26,26a) positioned adjacent the receptacle retention wall51G and the rhomboidal locking device 80G features a catch member 91Gprotruding radially on the outer periphery of the leading edge 81G (FIG. 26a). Inits relaxed state and before being located inside the receptacle body 40G, the outerradius of the catch member 91G of the rhomboidal locking device 80G can matchor exceed the radius of the deep groove 55G, such that the outer rim of the catchmember 91G sits in communication with the deep groove 55G. When the entirelocking device 80G inclines to expand within the key groove 48G (FIG. 27a), theaxial width of the deep groove 55G is greater than that of the catch member 91G toallow the catch member 91G to incline within the deep groove 55G.When the spigot end 12G of the pipe 10G pushes the inner edge 83G of therhomboidal locking device 80G (FIG. 27a), the deep groove 55G retains the catchmember 91G within it, causing the inner edge 83G to start expanding immediatelywithout the rhomboidal locking device 80G touching the opposite sidewall 52G(FIG. 28). In another embodiment, not shown by figures, the rhomboidal lockingdevice 80G featuring a catch member 91G has a trailing edge 82G with an outerdiameter not greater than that of the co-mating surface 57G of the receptacle body40G.In an embodiment of the pipe system (Fig. 30), the restriction of the pipe's 10Hinsertion inside the receptacle body 40H is acheived by incorporating a taperedlimiting shoulder 18H on the outer surface of the flared portion 16H of the pipe10H. This limiting shoulder 18H is contiguous with the mating surface 17H anddecreases the size of the outer surface of the flared portion 16H by taperinginwardly from the mating surface 17H to a linear second mating surface 19H. Suchtapering of the limiting shoulder 18H facilitates its smooth entry inside thereceptacle body 40H along with smooth interaction with the locking ring 80H.The containing bore 56H of the receptacle body 40H is reformable to closely matchthe contour of flared portion 16H of the pipe 10H, and features a co-limitingshoulder 58H. The co-limiting shoulder 58H is contiguous with the mating surface57H and followed by a linear second co-mating surface 59H. The second co-matingsurface 59H has a size only slightly larger than that of the second mating surface19H of the pipe 10H to ensure a snug fit to contain the flared portion 16H within.During insertion of the pipe 10H inside the receptacle body 40H the limitingshoulder 18H abuts with the co-limiting shoulder 58H to limit the insertion.In an embodiment, the co-limiting shoulder 58H in the receptacle body 40H tapersinwardly from the co-mating surface 57H to the second co-mating surface 59H.However, skilled artisans would understand that an effective embodiment of thecurrent system can be formed with a co-limiting shoulder 58H which is transverseto the centre axis 41H, and paired to abut with a tapered limiting shoulder 18H onthe pipe 10H, providing an equally effective barrier to the excessive entry of thepipe 10H in the receptacle body 40H.In an embodiment of the pipe 10H, the second mating surface 19H incorporates aseal groove 23H, wherein an elastomeric compressible sealing ring 24H is locatable(Fig. 30). This sealing ring 24H is designed to be compressed against its outersurface by the second co-mating surface 59H of the receptacle body 40H uponachieving a locked configuration (Fig. 34), ensuring a fluid-tight seal between thecomponents.Figures 30-34 illustrate the stages undergone by an embodiment of the pipe systemfor creating a locked joint. Figure 30 illustrates a pipe 10H positioned adjacent tothe receptacle 40H at the onset of insertion. Figure 31 illustrates the inner edge 83Hof the snap acting locking device 80H attaining a larger radial size to climb on thesecond mating surface 19H and start engagement with the pipe sealing ring 24H.Figure 32 and 32a, illustrate the inner edge 83H of the snap acting locking device80H expanding further over the sealing ring 24H and starting engagement with thelimiting shoulder 18H of the pipe 10H. Figure 33 illustrates a maximum desiredexpansion of the snap acting locking device 80H for insertion of the mating surface17H inside the containing portion 56H of the receptacle body 40H. And finally, thefigure 34 illustrates the pipe system in a locked / assembled / operative state.In another embodiment, a pressure gasket groove 62H, containing a pressureactivatedgasket 63H, is located after the second co-mating surface 59H andfollowed by an expanded surface 64H for the remaining portion of the containingbore 56H (Fig. 30). The expanded surface 64H has a size significantly larger thanthat of the second mating surface 19H but adequate to confine the pressureactivatedgasket 63H within the gasket groove 62H. When the assembly is in alocked and operational state (Fig. 34), the enlargement of the end portion of thecontaining bore 56H by the expanded surface 64H creates a fluid channel 68H atthe spigot end 12H of the pipe 10H. This channel serves to direct pressurized fluidto the pressure-activated gasket 63H. The pressurized fluid from fluid channel 68Hexpands the pressure-activated gasket 63H into tight engagement within thepressure gasket groove 62H and the second mating surface 19H to provide a fluidseal between the components.In an embodiment, the second co-mating surface 59I features a seal groove 60Ihousing a sealing ring 61I (Fig. 35), configured to be compressed by the secondmating surface 19I of the pipe 10I upon achieving a locked configuration.In an embodiment, a locking ring 80I features a chamfer 85I (FIG. 35) to interactin a smoother manner with the sealing ring 24I and the limiting shoulder 18I of thepipe 10I during insertion.In an embodiment, a flaring device 30I is affixed on a pipe 10I to provide a flaredportion 16I. The flaring device 30I has a linear second mating surface 19I locatedadjacent to the spigot end 12I and a limiting shoulder 18I bridges between themating surface 17I and the second mating surface 19I.In another embodiment, the locking ring 80J has a rhomboidal cross-section (Fig.36-37) wherein the inner edge 83J is tapered and enables a smooth engagement ofthe locking ring 80J with the sealing ring 24J and the limiting shoulder 18J on thepipe 10J.In another embodiment of the pipe system, (Fig. 38), the receptacle body 40Kcomprises one or more thrust rib 66K extending axially from the interior of thecontaining bore 56K for a length towards the reception end 42K. Correspondingly,the spigot end 12K of the pipe 10K comprise a thrust slot 26K relative to eachthrust rib 66K (Fig. 39-40). When the spigot end 12K of the pipe 10K enters thecontaining bore 56K of the receptacle body 40K, the pipe 10K is rotated along withaxial insertion inside the receptacle body 40K to locate each thrust rib 66K withinthe corresponding thrust slot 26K (Fig. 41), thereby permitting further axial entryof the spigot end 12K beyond the rib end 67K. The rib end 67K limits excessiveentry of the pipe 10K inside the receptacle body 40K by abutting with the slot end27K (Fig. 42). The interlock between the thrust rib 66K and the thrust slot 26Kprohibits unsynchronized rotation between the receptacle body 42K and the pipe10K.An embodiment of the pipe 10K can comprise an engagement shoulder 20Kdecreasing the diameter of the flared portion 16K from the mating surface 17K toa non-engagement surface 21K (Fig. 40) such that the diameter of the nonengagementsurface 21K is smaller than the inner diameter of the sealing ring 61Kpre-positioned in the receptacle body 40K. The engagement shoulder 20K islocated on the flared portion 16K such that during insertion of the pipe 10K insidethe receptacle body 40K. The engagement shoulder 20K engages with the sealingring 61K only after location of the thrust ribs 66K inside the corresponding thrustslot 26K (Fig. 41), which avoids any frictional resistance to rotation of the pipe10K caused by the sealing ring 61K.In another embodiment, the receptacle body 40K is a tube, extrusion formed withone or more thrust rib 66K running continuously inside the tube, wherein afterextrusion, the tube is machined to remove the unrequired length of each rib 66Kand to form the key groove 48K in the bore of the tube to shape the receptacle body40K.Fig. 39-42 illustrate the embodiment of the pipe 10K wherein thrust slots 26Kemployed as entry barrier can be formed monolithically on the pipe 10K, byinjection moulded manufacturing of the conduit body acting as the pipe 10K.In another embodiment of the pipe system, the thrust slot 26L on the pipe 10L canbe comprised by affixing a flaring device 30L at its end 13L as illustrated in Fig.43. The flaring device 30L comprises one or more thrust slot 26L extending axiallyinward from the spigot end 12L of the flaring device 30L to end at or before thebore end 32L of the bore 31L (Fig. 43).In an embodiment (Fig. 44-47), the pipe 10M can comprise a number of thrust slots26M along with a limiting shoulder 18M and a second mating surface 19M and asealing ring 24M. The sealing ring 24M is positioned on the second mating surface19M, such that the sealing ring 24M stays uncompressed under co-mating surface57M and engages with a tapered co-limiting shoulder 58M in the receptacle body40M (Fig. 46-46a) only after locating the thrust ribs 66M inside the correspondingthrust slot 26M to avoid any frictional resistance to rotation of the pipe 10M causedby the sealing ring 24M during insertion of the pipe 10M inside the receptacle body40M.In another embodiment, the receptacle body 40M comprises a sealing ring 61M inthe second co-mating surface 59M and an engagement shoulder 20M is located onthe flared portion 16M. The engagement shoulder 20M bridges between with thesecond mating surface 19M and a non-engagement surface 21M, such that theengagement shoulder 20M engages with the sealing ring 61M only after locationof the thrust ribs 66M inside the corresponding thrust slot 26M (Fig. 46-46a). Thisengagement of the engagement shoulder 20M with the sealing ring 61M avoids anyfrictional resistance to rotation of the pipe 10M caused by the sealing ring 61Mduring insertion of the pipe 10M inside the receptacle body 40M.In another embodiment, the locking device 80N is a split ring with interlocking endsfeaturing a locking profile 93N and a complementary locking profile 94N at one ofthe ends 86N & 88N along with radial extensions 87N & 89N (FIG. 48). Thelocking device 80N is pre-positioned in the key groove 48N before insertion of thepipe 10N inside the receptacle body 40N, such that, upon placement in the keygroove 48N, and in a relaxed state, the inner edge 83N of the split ring lockingdevice 80N has a diameter atleast slightly greater than the diameter of the matingsurface 17N (FIG. 49). Upon complete insertion of the flared portion 16N of thepipe 10N inside the containing bore 56N of the receptacle body 40N, the radialextensions 87N & 89N are squeezed together to interlock the locking profile 93Nand the complementary locking profile 94N against each other to decrease the sizeof locking device 80N to a locked state (FIG. 50). In a locked state, the inner edge83N of the locking device 80N has a diameter less than that of the mating surface17N of the pipe 10N and the locking ring 80N is sandwiched between the piperetention wall 14N and the receptacle retention wall 51N to prohibit the withdrawalof the pipe 10N from the receptacle body 40N. To unlock the assembly, the userscan space apart the radial extensions 87N and 89N from each other, such that thelocking profile 93N and complementary locking profile 94N detach from each otherto revert the locking device 80N to a relaxed state permitting the withdrawal of thepipe 10N from the receptacle body 40N.Figure. 51 illustrates the assembly of the pipe system with a locking device 80Nconfigured as a split ring with locking ends, demonstrating the visibility gap 45Nwhich provides a view of the locking device 80N when the assembly attains acoupled state. During field assembly of the system, there may be instances wherethe locking profile 93N and complementary locking profile 94N only partiallyengage, resulting in a less robust and unsustainable compression of the lockingdevice 80N into a locked state. However, the visibility gap 45N demonstrates theinsufficient contraction of the locking device 80N to the user and preventsunintended decoupling of the system.In another embodiment, the locking device 80P is a flexible spline manufacturedfrom a resilient and flexible plastic material like nylon, having an insertion end 96Pand an outside end 95P (FIG. 52). The spline type locking device 80P is insertedfrom the insertion end 96P in the key groove 48P from an opening 53P aftercomplete insertion of the flared portion 16P of the pipe 10P inside the containingbore 56P of the receptacle body 40P (FIG. 53). The key groove 48P has a depthless than the radial thickness of the locking device 80P such that upon insertioninside the key groove 48P, the locking device 80P acts against the pipe retentionwall 14P acting as a barrier for withdrawal of the pipe 10P from the receptacle body40P (FIG. 54).During assembly of the system in the field, a situation can arise wherein the lengthof the spline type locking device 80P falls short of covering the whole periphery ofthe key groove 48P where the locking device 80P provides an inferior lockingstrength than attainable. In other cases, the user may accidentally insert the wholespline type locking device 80P into the key groove 48P and the assembly becomespermanent and not de-couplable. Figure. 55 illustrates the visibility gap 45Pproviding a view of the locking device 80P to avert the aforementioned situations.Although the invention has been described with reference to specific embodiments,this description is not meant to be construed in a limiting sense. Variousmodifications of the disclosed embodiments, as well as alternate embodiments ofthe invention, will become apparent to persons skilled in the art upon reference tothe description of the invention. It is, therefore, contemplated that suchmodifications can be made without departing from the scope of the presentinvention as defined.

Claims

1. A pipe system comprising: a pipe (10, 10A, 10B, 10C, 10D, 10E, 10G, 10H, 10I, 10J, 10K, 10L, 10M, 10N, 10P) comprising an axis (11, 11G, 11H), a spigot end (12, 12A, 12C, 12D, 12E, 12G, 12H, 12I, 12K, 12L, 12M), an outer surface (15, 15A, 15B, 15C, 15D, 15H, 15I, 15K, 15L, 15M, 15N, 15P), a smooth bore (25, 25A) and a flared portion (16, 16A, 16C, 16D, 16E, 16H, 16I, 16J, 16K, 16L, 16M, 16P) extending axially inwardly from the spigot end (12, 12A, 12C, 12D, 12E, 12G, 12H, 12I, 12K, 12L, 12M) to a radial pipe retention wall (14, 14A, 14B, 14C, 14D, 14E, 14G, 14H, 14I, 14J, 14K, 14L, 14M, 14P), wherein, the flared portion (16, 16A, 16C, 16D, 16E, 16H, 16I, 16J, 16K, 16L, 16M, 16P) comprises a mating surface (17, 17A, 17B, 17C, 17D, 17E, 17G, 17H, 17I, 17J, 17K, 17L, 17M, 17N) positioned adjacent to the pipe retention wall (14, 14A, 14B, 14C, 14D, 14E, 14G, 14H, 14I, 14J, 14K, 14L, 14M, 14P) and is formed of a diameter greater than that of the outer surface (15, 15A, 15B, 15C, 15D, 15H, 15I, 15K, 15L, 15M, 15N, 15P), a receptacle body (40, 40A, 40B, 40C, 40D, 40E, 40F, 40G, 40H, 40I, 40J, 40K, 40L, 40M, 40N, 40P) comprising an axis (41, 41G, 41H) and a reception end (42, 42A, 42B, 42C, 42D, 42E, 42G, 42H, 42I, 42J, 42K, 42L, 42M, 42N, 42P); a clear bore (43, 43A, 43D, 43E, 43H, 43K, 43M, 43P) that inwardly extends from the reception end (42) upto a key groove (48, 48A, 48B, 48C, 48D, 48E, 48F, 48G, 48H, 48I, 48J, 48K, 48L, 48M, 48N, 48P) lying between a receptacle retention wall (51, 51A, 51E, 51G, 51H, 51P) towards the clear bore (43, 43A, 43D, 43E, 43H, 43K, 43M, 43P) and an opposite sidewall (52, 52A, 52E, 52G), and a containing bore (56, 56A, 56E, 56H, 56I, 56J, 56M, 56P) extending axially from the opposite sidewall (52, 52A, 52E, 52G) to the interior of the receptacle body to accommodate the flared portion (16, 16A, 16C, 16D, 16E, 16H, 16I, 16J, 16K, 16L, 16M, 16P) axially and radially within, such that, a visibility gap (45, 45A, 45D, 45E, 45G, 45H, 45K, 45L, 45N, 45P) in the inner periphery of the clear bore (43, 43A, 43D, 43E, 43H, 43K, 43P) is formed when the pipe retention wall (14, 14A, 14B, 14C, 14D, 14E, 14G, 14H, 14I, 14J, 14K, 14L, 14P) enters the clear bore (43, 43A, 43D, 43E, 43H, 43K, 43P) during insertion of the pipe (10, 10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10I, 10J, 10K, 10L, 10M, 10N, 10P), wherein the visibility gap (45, 45A, 45D, 45E, 45G, 45H, 45K, 45L, 45N, 45P) provides a view of the pipe retention wall (14, 14A, 14B, 14C, 14D, 14E, 14G, 14H, 14I, 14J, 14K, 14L, 14M, 14P) from the reception end (42, 42A, 42B, 42C, 42D, 42E, 42G, 42H, 42I, 42J, 42K, 42L, 42M, 42N, 42P) until the assembly is in an uncoupled state, a locking device (80, 80A, 80B, 80C, 80D, 80E, 80F, 80G, 80H, 80I, 80J, 80K, 80L, 80M, 80P) located in the key groove (48, 48A, 48B, 48C, 48D, 48E, 48F, 48G, 48H, 48I, 48J, 48K, 48L, 48M, 48N, 48P) comprising a leading edge (81, 81A, 81B, 81C, 81E, 81F, 81G, 81N, 81P) towards the receptacle retention wall (51, 51A, 51E, 51G, 51H, 51P) and an oppositely disposed trailing edge (82, 82A, 82E, 82G, 82H), wherein the a locking device (80, 80A, 80B, 80C, 80D, 80E, 80F, 80G, 80H, 80I, 80J, 80K, 80L, 80M, 80P) is positioned to be sandwiched between the pipe retention wall (14, 14A, 14B, 14C, 14D, 14E, 14G, 14H, 14I, 14J, 14K, 14L, 14M, 14P) and receptacle retention wall (51, 51A, 51E, 51G, 51H, 51P) to couple the assembly, such that, the visibility gap (45, 45A, 45D, 45E, 45G, 45H, 45K, 45L, 45N, 45P) provides a view of the locking device (80, 80A, 80B, 80C, 80D, 80E, 80F, 80G, 80H, 80I, 80J, 80K, 80L, 80M, 80P) when the system attains a coupled state.

2. The pipe system as claimed in claim 1, wherein the clear bore (43, 43D, 43E, 43H, 43K) comprises a visibility enhancement chamfer (44, 44D, 44E, 44H, 44K) at the reception end (42, 42D, 42E, 42H, 42K)3. The pipe system as claimed in claim 1, wherein the locking device (80N) is a split ring with interlocking ends, configured to be pre-positioned in the key groove (48N) before the insertion of the pipe (10N) into the receptacle body (40N), wherein the split ring comprises : a locking profile (93N) at one end (86N) and a complementary locking profile (94N) at the other end (88N), such that when placed in the key groove (48N) in a relaxed state, an inner edge (83N) of the split ring has a diameter not less than that of the mating surface (17N) of the pipe (10N), and wherein upon interlocking the locking profile (93N) and complementary locking profile (94N), the inner edge (83N) acquires a diameter smaller than that of the mating surface (17N).

4. The pipe system as claimed in claim 1, wherein the locking device (80P) is a flexible spline made from a resilient and flexible plastic material, such as but not limited to nylon, wherein the spline-type locking device (80P) is inserted from an opening (53P) in the key groove (48P) after the complete insertion of a flared portion (16P) of the pipe (10P) into the containing bore (56P) of the receptacle body (40P).

5. The pipe system as claimed in claim 1, comprises a snap acting locking device (80, 80A, 80B, 80C, 80D, 80E, 80F, 80G, 80H, 80I, 80J, 80K, 80L, 80M) that is prepositioned in the key groove (48, 48A, 48B, 48C, 48D, 48E, 48F, 48G, 48H, 48I, 48J, 48K, 48L, 48M) before insertion of the pipe (10, 10A, 10B, 10C, 10D, 10E, 10G, 10H, 10I, 10J, 10K, 10L, 10M), wherein in an un-coupled assembly of the pipe system, the inner diameter of a trailing edge (82, 82A, 82E, 82G, 82J) of the snap acting locking device (80, 80A, 80B, 80C, 80D, 80E, 80F, 80G, 80H, 80I, 80J, 80K, 80L, 80M) is less than that of the mating surface (17, 17A, 17B, 17C, 17D, 17E, 17G, 17H, 17I, 17J, 17K, 17L, 17M) of the pipe (10, 10A, 10B, 10C, 10D, 10E, 10G, 10H, 10I, 10J, 10K, 10L, 10M), and wherein upon insertion of the pipe (10, 10A, 10B, 10C, 10D, 10E, 10G, 10H, 10I, 10J, 10K, 10L, 10M), the locking device (80, 80A, 80B, 80C, 80D, 80E, 80F, 80G, 80H, 80I, 80J, 80K, 80L, 80M) gradually expands permitting the flared portion (16, 16A, 16C, 16D, 16E, 16H, 16I, 16J, 16K, 16L, 16M) of the pipe (10, 10A, 10B, 10C, 10D, 10E, 10G, 10H, 10I, 10J, 10K, 10L, 10M) to enter the containing bore (56, 56A, 56E, 56H, 56I, 56J, 56M) and when the flared portion (16, 16A, 16C, 16D, 16E, 16H, 16I, 16J, 16K, 16L, 16M) locates completely inside the containing bore (56, 56A, 56E, 56H, 56I, 56J, 56M), the locking device (80, 80A, 80B, 80C, 80D, 80E, 80F, 80G, 80H, 80I, 80J, 80K, 80L, 80M) destresses and contracts, which causes trapping of the flared portion (16, 16A, 16C, 16D, 16E, 16H, 16I, 16J, 16K, 16L, 16M) within the containing bore (56, 56A, 56E, 56H, 56I, 56J, 56M) and locking the assembly.

6. The pipe system as claimed in claim 5, wherein the locking device (80, 80A, 80B, 80C, 80D, 80H, 80I) is a snap acting split ring having an inner edge (83, 83A, 83B, 83C, 83D, 83H, 83I) that is linear to the axis (41, 41H) of the receptacle body (40, 40A, 40B, 40C, 40D, 40H, 40I, 40K, 40L, 40M).

7. The pipe system as claimed in claim 6, wherein the split ring locking device (80A, 80D, 80I) comprises a chamfer (85A, 85D, 85I) facing the reception end (42A, 42D, 42I) that is positioned in the inner periphery of its leading edge (81A).

8. The pipe system as claimed in claim 6, wherein the split ring locking device (80B) has an incomplete circumference and comprises radial extensions (87B and 89B) at ends (86B and 88B) of the split ring locking device (80B), which protrude outward from an opening (53B) in the key groove (48B) of the receptacle body (40B), wherein when the radial extensions (87B and 89B) are pushed apart, the split ring locking ring device (80B) expands, causing inner edge (83B) of the split ring locking ring device (80B) to achieve a size larger than that of the mating surface (17B) of the pipe (10B).

9. The pipe system as claimed in claim 6, wherein the ends (86C and 88C) of the split ring locking device (80C) circumferentially overlap and comprise radial extensions (87C and 89C) which protrude out from an opening (53C) in the key groove (48C), wherein upon squeezing the radial extensions (87C and 89C) together, the locking ring device (80C) expands to a size such that its inner edge (83C) achieves a diameter larger than that of the mating surface (17C) of the pipe (10C).

10. The pipe system as claimed in claim 5, wherein the snap acting locking device (80E, 80F, 80G, 80J) is formed of a rhomboidal cross-section, wherein an inner edge (83E, 83F, 83G, 83J) and an outer edge (84E, 84G) taper inwardly towards the trailing edge (82E, 82G, 82J) such that the portion of the locking ring device (80E, 80F, 80G, 80J) located inside the key groove (48E, 48F, 48G, 48J) forms a frusto-conical configuration.

11. The pipe system as claimed in claim 10, wherein the locking device (80F) is a snap acting split ring completely accommodatable inside the key groove (48F), wherein the maximum radial size (97F) of the leading edge (81F) is not less than the diameter of the key groove (48F), which ensures that upon placement within the key groove (48F) the outer rim of the leading edge (81F) contacts the base of the key groove (48F) to form a corresponding circular shape.

12. The pipe system as claimed in claim 11, wherein the split ring locking device (80G) comprises a catch member (91G) extending on the outer periphery of the leading edge (81G), and the key groove (48G) of the receptacle body (40G) comprises a deep groove (55G) adjacent to the receptacle retention wall (51G) to capture the catch member (91G) within, which limits the axial movement of the locking device (80G) and initiates immediate expansion of the locking device (80G) upon being pushed by the spigot end (12G) during insertion of the pipe (10G) in the receptacle body (40G).

13. The pipe system as claimed in claim 10, wherein the snap acting locking device (80E) comprises an arcuate band, wherein the outer diameter of the leading edge (81E) is not smaller than that of the key groove (48E), consequently upon placement of the locking ring device (80E) within the key groove (48E), the outer rim of the leading edge (81E) makes contact with the base of the key groove (48E) to form a corresponding circular shape.

14. The pipe system as claimed in claim 5, comprises a tubular push key (70A, 70D, 70E) featuring a bore (77A, 77D, 77E), an insertion end (71A, 71D, 71E), an oppositely disposed gripping end (74A), and a raising surface (73A, 73D, 73E), extending axially on the outer of the push key (70A, 70D, 70E) from the insertion end (71A, 71D, 71E), wherein the bore (77A, 77D, 77E) is mountable on the outer surface (15A, 15D, 15E) of the pipe (10A, 10D, 10E), and the raising surface (73A, 73D, 73E) has a diameter not less than that of the mating surface (17A, 17D, 17E) of the pipe (10A, 10D, 10E), such that subsequent to insertion of the push key (70A, 70D, 70E) from its insertion end (71A, 71D, 71E) into the visibility gap (45A, 45D, 45E) of a coupled assembly, the locking device (80A, 80D, 80E) expands within the key groove (48A, 48D, 48E), causing decoupling of the system.

15. The pipe system as claimed in claim 1, wherein the flared portion (16H, 16I, 16J, 16M) comprises a limiting shoulder (18H, 18I, 18J, 18M) tapering inwardly from the mating surface (17H, 17I, 17J, 17M), to a second mating surface (19H, 19I, 19J, 19M), and complementing the contours of the flared portion (16H, 16I, 16J, 16M), the containing bore (56H, 56I, 56J, 56M) of the receptacle body (40H, 40I, 40J, 40M) comprises a co-mating surface and a second co-mating surface (59H, 59I, 59J, 59M), both configured to accommodate mating surface (17H, 17I, 17J, 17M) and the second mating surface (19H, 19I, 19J, 19M) respectively, separated from each other by a colimiting shoulder (58H, 58I, 58J, 58M), such that the pipe's (10H, 10I, 10J, 10M) insertion inside the receptacle body (40H, 40I, 40J, 40M) is limited by the abutment between the limiting shoulder (18H, 18I, 18J, 18M) and the co-limiting shoulder (58H, 58I, 58J, 58M).

16. The pipe system as claimed in claim 15, wherein the containing bore (56H) comprises a pressure activated gasket (63H) housed inside a pressure gasket groove (62H) located deeper in the receptacle body (40H) after the second co-mating surface (59H), and followed axially by an expanded surface (64H) having a diameter larger than the second mating surface (19H) of the pipe (10H) to provide a fluid channel (68H) for the operating the pressure activated gasket (63H) when the assembly is in a locked state.

17. The pipe system as claimed in claim 15, wherein the co-limiting shoulder (58H, 58I, 58J, 58M) is tapered to the axis (42H) of the receptacle body (40H, 40I, 40J, 40M).

18. The pipe system as claimed in claim 17, comprises a seal groove (23H, 23M) housing a compressible sealing ring (24H, 24M) located on the second mating surface (19H, 19M) of the pipe (10H, 10M) such that in a coupled state of assembly, the sealing ring (24H, 24M) stays compressed against the second co-mating surface (59H, 59M) to provide a fluid seal between the pipe (10H, 10M) and the receptacle body (40H, 40M).

19. The pipe system as claimed in claim 1, comprises a one or more of thrust ribs (66K, 66L, 66M) extending axially towards the reception end (42K, 42L, 42M) from the interior of the containing bore (56K, 56M), wherein the pipe (10K, 10L, 10M) comprises a thrust slot (26K, 26L, 26M) corresponding to each rib (66K, 66L, 66M), wherein during the insertion of the pipe (10K, 10L, 10M) into the receptacle body (40K, 40L, 40M), the pipe (10K, 10L, 10M) is simultaneously rotated to align and interlock the thrust rib (66K, 66L, 66M) with the corresponding thrust slot (26K, 26L, 26M), wherein the interlock prevents unsynchronized rotation between the pipe (10K, 10L, 10M) and the receptacle body (40K, 40L, 40M) in the coupled state of the assembly.

20. The pipe system as claimed in claim 19, wherein a seal groove (23M) containing a sealing ring (23M) is positioned on the second mating surface (19M), wherein a co30 limiting shoulder (58M) in the containing bore (56M) and the sealing ring (24M) engage after each thrust rib (66M) is located inside the respective thrust slot (26M).

21. The pipe system as claimed in claim 1, comprises a seal groove (60, 60I, 60K, 60M) positioned in the containing bore (56, 56I, 56K, 56M) of the receptacle body (40, 40I, 40K, 40M), which houses a compressible sealing ring (61, 61I, 61K, 61M), wherein in a coupled assembly, the sealing ring (61, 61I, 61K, 61M) stays compressed against the flared portion (16, 16I, 16K, 16M) of the pipe to provide a fluid seal.

22. The pipe system as claimed in claim 19, comprises a non-engagement surface (21K, 21M) having a diameter less than the inner diameter of a sealing ring (61K, 61M) located in a seal groove (60K, 60M) in the containing bore (56K, 56M) of the receptacle body (40K, 40M), wherein the non-engagement surface (21K, 21M) extends axially on the pipe (10K, 10M) from the spigot end (12K, 12M) and is followed contiguously by a tapered seal engagement shoulder (20K, 20M), and wherein the length of the nonengagement surface (21K, 21M) is configured to engage the seal engagement shoulder (20K, 20M) with the sealing ring (61K, 61M) after each thrust rib (66K, 66M) is located inside the respective thrust slot (26K, 26M) during insertion of the pipe (10K, 10M).

23. The pipe system as claimed in claim 1, wherein the flared portion (16A, 16C, 16D, 16I, 16J, 16L) is comprised on the pipe (10A, 10C, 10D, 10I, 10J, 10L) by attaching a flaring device (30A, 30C, 30D, 30I, 30J, 30L) at a pipe end (13A, 13C, 13D, 13I, 13J, 13L), wherein the flaring device (30A, 30C, 30D, 30I, 30J, 30L) is a tubular body having a spigot end (12A, 12C, 12D, 12I, 12J, 12L), an oppositely disposed joining end (33A, 33C, 33D, 33I, 33J, 33L), a flared portion (16A, 16C, 16D, 16I, 16J, 16L) extending on the flaring device (30A, 30C, 30D, 30I, 30J, 30L) from the spigot end (12A, 12C, 12D, 12I, 12L) for a length up to a pipe retention wall (14A, 14C, 14D, 14I, 14J, 14L), and a bore (31A, 31C, 31D, 31I, 31J, 31L) extending axially inwardly from its joining end (33A, 33C, 33D, 33I, 33J, 33L) to attach with the outer surface (15A, 15C, 15D, 15I, 15L) of the pipe (10A, 10C, 10D, 10I, 10J, 10L).

24. The pipe system as claimed in claim 23, wherein the pipe retention wall (14A, 14C) is located at the joining end (33A, 33C).

25. The pipe system as claimed in claim 23, wherein the pipe retention wall (14D, 14J) and the joining end (33D, 33J) are separated by an extended surface (34D, 34J).

26. The pipe system as claimed in claim 23, wherein the flaring device (30A, 30D, 30L) is made from a polyolefin material, including Polypropylene and polyethylene, and atleast the outer surface (15A, 15D, 15L) of the pipe (10A, 10D, 10L) is made of the same material, facilitating heat fusion between the bore (31A, 31D, 31L) and outer surface (15A, 15D, 15L).

27. The pipe system as claimed in claim 26, wherein the polyolefin material used for making the flaring device (30A, 30D, 30L) is reinforced with agents including, but not limited to, glass fibre and carbon fibre to prevent decoupling due to deformation of the pipe retention wall (14A, 14D, 14L) by cold flow.

28. The pipe system as claimed in claim 26, wherein the pipe (10A, 10D, 10L) and the flaring device (30A, 30D, 30L) are manufactured separately, and then bore (31A, 31D, 31L) and outer surface (15A, 15D, 15L) are heat fused together.

29. The pipe system as claimed in claim 26, wherein the flaring device (30A, 30D, 30L) is over-moulded on the outer surface (15A, 15D, 15L) adjacent to the pipe end (13A, 13D, 13L).

30. The pipe system as claimed in claim 23, wherein the pipe (10A, 10D, 10L) and the flaring device (30A, 30D, 30L) are made from the PVC (Poly-vinyl-chloride) and the bore (31A, 31D, 31L) and the outer surface (15A, 15D, 15L) are solvent welded.

31. The pipe system as claimed in claim 23, wherein the pipe (10C) and the flaring device (30C) are both made from any rigid material like metal or PVC (Poly-vinyl chloride) and the bore (31C) and the outer surface (15C) are threadedly attached with each other.

32. The pipe system as claimed in claim 1, wherein at least a portion of the locking device (80, 80A, 80D, 80E, 80G, 80H, 80K, 80L, 80N, 80P) that is visible from the visibility gap (45, 45A, 45D, 45E, 45G, 45H, 45K, 45L, 45N, 45P) has a colour in contrast with the surfaces of other system components visible within the visibility gap (45, 45A, 45D, 45E, 45G, 45H, 45K, 45L, 45N, 45P).