Liquid pipeline, in particular a liquid pipeline for underground transport of hot liquid

Abstract

A liquid pipeline 1A consists of an outer jacket 3, a medium-carrying pipe 5 contained within it, and insulation material located between the outer jacket 3 and the medium-carrying pipe 5. At one end of the liquid pipeline 1A, a baffle 9 is present against the insulation material. Baffle 9 is provided with a circular hole 11 through which the medium-carrying pipe 5 passes. Baffle 9 is connected to the medium-carrying pipe 5 in a liquid-tight manner along the entire circumference of the medium-carrying pipe 5 and is connected to the outer jacket 3 in a liquid-tight manner along the entire circumference of the outer jacket 3. The baffle forms a water barrier which, in the event of damage, limits the internal spread of penetrating (ground) water in the longitudinal direction of the liquid pipeline. Consequently, when repairing the liquid pipeline, at most the section of the liquid pipeline between two baffles on either side of the damage needs to be replaced.

Description

DESCRIPTION: Field of the invention The invention relates to a , comprising an outer jacket, a medium-carrying tube, which is present in the outer sheath and with ends protruding from the outer sheath, and insulation material that is present between the outer jacket and the medium-carrying pipe and that is in contact with the inside of the outer jacket and with the outside of the medium-carrying pipe, whereby a bulkhead against the at least one end of the liquid pipeline insulation material is present, whereby the bulkhead is provided with a circular hole and the medium-carrying tube passes through the hole. More specifically, the invention has relating to a liquid pipeline for district heating consisting of a network of underground liquid pipelines, through which warm / hot water flows. This allows houses / buildings and / or hot tap water for tap water and to showers are heated. The heat source varies from a power plant or a from waste incineration to geothermal / aquathermy and waste heat from data centers. The most Typical customers are private homeowners, housing associations and business clients (office owners). State of the art A liquid pipeline within the meaning of the opening of claim 1 is known from US 3 560 287 A1. In practice, the outer jacket may become damaged. due to, for example, excavation work, discontinuities in the subsurface, or expansion due to temperature fluctuations. As a result, (ground)water can enter through cracks or holes in the penetrate the outer jacket into the insulation layer up to the wall of the medium-carrying pipe. At a medium temperature of more than 100 (C, the insulation material will (polyurethane foam) boils away and pressure builds up, causing the moisture spreads along the length of the liquid pipeline and the insulation material further deteriorates. After the leak has been detected (due to a malfunction in the leak detection), In practice, it often takes a long time to carry out repair work, as a result of which the replacement costs are extra high. Characteristic of such fluid pipelines is the formation of a space between the medium-carrying pipe and the insulation material. As a result of this space can allow groundwater to penetrate as a result of damage to the outer jacket spread in the longitudinal direction of the fluid pipeline. In the case of a A medium temperature of 100 °C or higher will cause it to connect with the medium-carrying pipe in contact incoming groundwater will start boiling and boil away the polyurethane foam. The boiling of the groundwater in the space between the casing pipe and the medium-carrying The pipe creates a pressure build-up, causing the groundwater to move further. along the medium-carrying pipe and / or seeks an exit from the liquid pipeline. What What remains is a limp, warm outer coat draped over the medium-lining. pipe and the lack of thermal insulation of the transport heat relative to the environment. The groundwater containing the boiled-away polyurethane foam that a has found an escape route outside the outer casing will act as uncontrolled vapor / steam protrude above ground level / infrastructure. This results in odor nuisance combined with visible vapor / steam formation. When repairing the liquid pipeline, it is assumed that the fluid pipeline from bend to bend or from bend to T-piece is damaged and needs to be replaced. Summary of the invention One purpose of the invention is to provide a liquid. pipeline where the damage if the outer jacket is damaged is less than for the well-known liquid pipeline. To this end, the liquid pipeline is according to the invention characterized by the fact that the bulkhead extends over the entire circumference of the medium-carrying pipe is connected liquid-tight to the medium-carrying pipe and over the entire perimeter of the outer jacket is connected to the outer jacket in a liquid-tight manner. The bulkhead forms a water barrier whereby, in the event of damage, it spreads internally. of the penetrating groundwater in the longitudinal direction of the fluid pipeline is limited. As a result, during repair of the Liquid pipeline, only the part needs to be covered. of the liquid pipeline between two bulkheads on either side of the damage to be replaced. From US 2011 / 0214770 A1, an insulation element is known consisting of a closed, semicircular-arc-shaped housing containing insulation material that against a medium-carrying pipe can be installed for the purpose of insulating the medium-carrying pipe. This insulation element is not suitable for use with liquid. pipelines where the insulation material is in direct contact with the medium-carrying pipe and an outer jacket around which the insulation material is present. An embodiment of the fluid pipeline according to the invention is characterized by the fact that the bulkhead is formed by a plate provided with a hole. The advantage of this is that a panel is easy to install. At the location of the The connection of the plate to the medium-carrying pipe and the outer jacket only requires a a liquid-tight seal must be applied. This can be a sealant or a sealing rubber that may already be on the prior to installing the plate plate has been installed. A further implementation of the liquid pipeline according to the The invention is characterized by the fact that the bulkhead is formed by a hardened layer of resin. The resin-formed bulkhead is directly attached to the medium-carrying pipe and the outer jacket. attached so that no additional sealing is required. The invention also relates to a process for the improving a liquid pipeline for underground transport of liquid, which fluid pipeline comprises an outer jacket, as well as a medium-carrying pipe which is present in the outer sheath and insulation material that is present between the medium-carrying pipe and the outer jacket. The improvement involves adjusting it in such a way of a liquid pipeline such that in the event of leakage of the outer jacket, the damage to the liquid piping remains limited. With regard to this method, the invention is characterized by the fact that the insulation material extends over a distance from the liquid pipeline and the outer casing be removed, after which a bulkhead against the insulation material of one of the parts of the fluid pipeline adjacent to the break is installed and connected liquid-tight to the medium-carrying pipe and to the outer casing of that part of the liquid pipeline. The bulkhead forms a water barrier. which prevents groundwater seeping inwards in the event of a leak in the outer casing can spread over a long length of the fluid pipeline. An embodiment of the method according to the invention is characterized by the fact that the bulkhead is installed by two plate sections, each provided are of a semicircular recess, over the exposed medium-carrying tube to apply and connect to each other in a liquid-tight manner or to each other in a liquid-tight manner adhere. In the case of a liquid pipeline already present in the ground, one can of a hole the provided plate shall be fitted only around the medium-carrying pipe after first the to interrupt the medium-carrying pipe. However, this is undesirable. With the procedure According to the invention, the liquid pipeline does not need to be installed for the placement of the baffle. not to be interrupted A further implementation of the method according to the invention is characterized by the fact that the sheet is applied by a viscous resin over the entire side surface of the insulation material against the insulation material of one of the to apply a break between adjacent parts of the liquid pipeline and thereby to connect liquid-tight to the medium-carrying pipe and to the outer jacket of that part of the liquid pipeline. The advantage of this method compared to the The method described above is that when applying the resin, a obtained a liquid-tight connection to the medium-carrying pipe and the outer jacket is, no extra actions need to be performed for this. Also with this For this method, the liquid pipeline does not need to be installed before the bulkhead. be interrupted. Brief description of the drawings The invention will be explained in more detail below by means of a execution examples of the liquid pipeline shown in the drawings according to the invention. Hereby shows: Figure 1 a network of fluid pipelines during installation in the ground; Figure 2 an end of a known fluid pipeline; Figure 3 a first embodiment of the fluid pipeline according to the invention; Figure 4 the bulkhead of the liquid pipeline shown in Figure 3; Figure 5 shows a second embodiment of the fluid pipeline. according to the invention; Figure 6 a baffle for application in an existing liquid pipeline; Figure 7 a third embodiment of the fluid pipeline according to the invention in longitudinal section; and Figure 8 the fluid pipeline shown in Figure 7 in front view. Detailed description of the drawings Figure 1 shows a network of underground fluid pipelines 1 for district heating shown where hot water flows through for the heating of houses and buildings. The network comprises interconnected straight and curved (bends) Liquid pipelines l. The connection between the Liquid The piping was constructed by welding the medium-carrying pipes together. The outer jackets of the liquid pipelines are connected to each other via a socket. connected. This sleeve is welded to the outer jackets by heating the inside of the sleeve by sending a large current through a device present in the sleeve resistance wire. The space between the insulation layers of the liquid piping is then filled with insulation material. In Figure 2, an end of a known fluid pipeline is 1 shown. This well-known fluid pipeline 1 has an outer jacket 3 and a medium-carrying tube 5, which is present in the outer jacket 3 and with ends 3A out the outer jacket 3 protrudes. Between the outer jacket 3 and the medium-carrying pipe 5 is insulation material 7 present. The medium-carrying pipe 5 is often made of steel and the The outer sheath 3 is often made of polyethylene. As insulation material 7 is often polyurethane foam applied. Due to the insulation material 7 stretch leak detection wires 8 out. Figure 3 shows an end of a first embodiment of the Liquid piping 1A shown according to the invention. All parts which are identical are connected to the known liquid pipeline 1 shown in Figure 2 and are with the same reference numbers indicated. The fluid pipeline 1A is provided at one end of a partition formed by a plate 9 that is present against the insulation material. This plate 9 is provided with a circular hole 11 and is over the medium-carrying tube 5 pushed up against the insulation material and the outer jacket 3. The hole 11 has a diameter equal to the outer diameter of the medium-carrying pipe 5. The Plate 9 is liquid-tight over the entire circumference of the medium-carrying tube 5 with the medium-carrying pipe 5 connected and is over the entire circumference of the outer jacket 3 connected to the outer jacket 3 in a liquid-tight manner. Plate 9 is furthermore provided with two (or in some cases Four) small holes 13 through which the leak detection wires 8 liquid-tight insertion. These small holes 13 are after the leak detection wires 8 through the holes are lined, finished liquid-tight. When connecting two Liquid pipelines IA, it is the bulkhead-equipped end of one of the fluid pipelines attached at an unbulked end of the other liquid pipeline. In the The piping network formed in this way is therefore situated between the Liquid pipe partitions that seal the spaces containing insulation material liquid-tight separate from each other. As a result, in the event of a leak in the outer casing of a Liquid pipeline the incoming groundwater does not flow internally towards neighboring moving liquid pipelines. The liquid pipeline IA is manufactured by the medium-carrying party. to install pipe 5 in the outer jacket 3 and the space between the medium-carrying pipe 5 and to fill the outer sheath 3 with insulation material 7. Next, a end of the fluid pipeline 1 the plate 9 over the protruding part of the medium-carrying tube 5 slid and liquid-tight to the outer jacket 3 and the medium-carrying pipe 5 secured, for example by glue or sealant. In Figure 4, plate 9 is shown separately. Plate 9 is formed by a circular disc where the circular hole 11 is in the center of the disk is located. The smaller holes 13 are both located in one half of the disk. In In the case of four leak detection wires, there are also four smaller holes and they are distributed about the disk. The liquid piping can also be without leak detection wires. executed and equipped with various medium-carrying tubes. By way of An example of another version is shown in Figure 5 as the end of a second one. embodiment of the fluid piping according to the invention shown All parts that are identical to the first embodiment of the shown in Figure 3 Liquid piping is indicated with the same reference numbers. This liquid Pipeline 1B has two medium-carrying pipes 5; otherwise, this is fluid. pipeline identical to the first version. Existing pipeline networks that are not equipped with water-retaining walls Bulkheads can still be fitted with such bulkheads. For this purpose, naturally, access to the liquid pipeline must first be granted and then over the entire circumference of the liquid pipeline over part of the length of the liquid the pipe, the insulation material 7 and the outer jacket 3 to be removed. After this become two plate sections 9A and 9B, each provided with a semicircular recess 11A, 11B, over the exposed medium-carrying pipe 5 and against the insulation material 7 of one of the parts of the Liquid adjacent to the interruption piping, installed. These plate sections 9A and 9B are sealed with, for example, sealant attached to each other in a liquid-tight manner and also in a liquid-tight manner to the medium-carrying tube 5 and attached with the outer casing 3. Next, the parts of the outer jackets connected to each other again via a sleeve and the space between the parts of the liquid pipelines filled with insulation material. Figure 6 shows a plate for application in an existing liquid. pipeline shown. This plate consists of two halves 9A and 9B, each provided are of a semicircular recess 11A and 11B. In one of the halves 9A the smaller holes 13 are located for the leak detection wires. Figures 7 and 8 show a third embodiment of the Liquid. pipeline according to the invention in longitudinal section and front view respectively displayed. All parts that are identical to those of the previously described execution forms are indicated with the same reference numbers. In these embodiment is the bulkhead formed by a layer of hardened resin 10 which during the manufacture in a viscous state against the side surface of the insulation material 7 is applied and thereby liquid-tight on the outside of the medium-carrying pipe 5 and adheres to the inside of the outer sheath 3. Although the invention has been explained in the foregoing on the basis of the drawings, it must be established that the invention in no way falls within the scope of the The designs shown in the drawings are limited. The invention also extends to to all versions deviating from the versions shown in the drawings implementation forms within the framework defined by the conclusions. For example, the liquid piping according to the invention may also be used to advantage for transport of colder liquid such as for example if the spaces in homes / commercial buildings need to be cooled instead of heated. Here too the insulation material is affected by groundwater in the event of leakage of the outer jacket and also here the groundwater will spread via the insulation in the longitudinal direction of the liquid pipeline

Claims

1. Liquid pipeline (1A; 1B), in particular a liquid pipeline for underground transport of hot liquid, comprising an outer jacket (3), a medium-carrying tube (5), which is present in the outer jacket (3) and with ends (3A) protrudes from the outer casing (3), and insulation material (7) that is present between the outer jacket (3) and the medium-carrying tube (5) and that is in contact with the inside of the outer jacket (3) and with the outside of the medium-carrying pipe (5), where at at least one end of the liquid pipeline (1A; 1B) a bulkhead against the insulation material (7) is present, with the bulkhead provided with a circular hole (11) and the medium-carrying tube (5) passes through the hole (11), with the characteristic that it bulkhead over the entire circumference of the medium-carrying pipe (5) liquid-tight with the medium-carrying tube (5) is connected and over the entire circumference of the outer jacket (3) is connected to the outer jacket (3) in a liquid-tight manner.

2. Liquid pipeline (1A; 1B) according to claim 1, characterized by the fact that The bulkhead is formed by a plate provided with a hole (9).

3. Liquid pipeline (1A; 1B) according to claim 1, characterized by the fact that The bulkhead is formed by a hardened layer of resin (10).

4. Procedure for improving a fluid pipeline (IA; IB) for underground transport of liquid, which liquid pipeline (IA; IB) a outer jacket (3) comprises, as well as a medium-carrying tube (5) which is present in the outer jacket (3) and insulation material (7) present between the medium-carrying tube (5) and the outer casing (3), with the characteristic that of the fluid pipe over a distance the insulation material (7) and the outer casing (3) are removed, after which a partition against the insulation material (7) of one of the walls bordering the interruption parts of the liquid pipeline are installed and connected in a liquid-tight manner. with the medium-carrying tube (5) and with the outer jacket (3) of that part of the liquid piping.

5. Method according to claim 4, characterized by the fact that the shot is installed by two plate sections (9A, 9B), each of which is provided with a semicircular recess (11A, 11B), over the exposed medium-carrying pipe (5) to apply and connect to each other in a liquid-tight manner or to each other in a liquid-tight manner to attach.

6. Method according to claim 4, characterized by the fact that the shot is applied by a viscous resin (10) over the entire side surface of the insulation material (7) against the insulation material (7) of one of the interruptions to install adjacent parts of the liquid pipeline and in doing so liquid-tight 5 to connect to the medium-carrying pipe (5) and to the outer jacket (3) of that part of the liquid pipeline.

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