A sectional pipe for district heating pipe insulation and a method of installing the same

Abstract

The application provides a kind of area heating pipeline insulation layer partition pipe fittings and its installation method.The application includes: medium conveying steel pipe, steel sealing fixed disc, sealing rubber ring, sealing ring plate, pressing disc, tightening disc, fastener and wing ring, both ends of the medium conveying steel pipe are connected with the pipeline to be connected respectively, the steel sealing fixed disc is sleeved on the outside of the medium conveying steel pipe, the sealing ring plate and the pressing disc are sequentially sleeved on the medium conveying steel pipe, the tightening disc is sleeved on the medium conveying steel pipe and there is a preset distance between the tightening disc and the pressing disc, the pressing disc drives the sealing ring plate to be pressed on the steel sealing fixed disc through the fastener, the wing ring is sleeved on the outer layer of the above components, and the connection between the outer layer of the medium conveying steel pipe and the insulation layer of the pipeline to be connected is completed through the wing ring.The application can avoid the problem that the extension of water inlet of old pipeline causes damage and destruction of newly built or newly repaired pipeline, and the problem that the connection between monitoring partitions is affected due to sealing defects of the outer protective tube.

Description

Technical Field

[0001] This invention relates to the field of waterproof sealing and partitioning technology for pipeline insulation layers, and more specifically, to a partition pipe fitting for insulation layers of district heating pipelines and its installation method. Background Technology

[0002] In the construction of new pipelines for centralized heating, it is common to encounter situations where new pipelines are connected to old pipelines. The outer sheath of old pipelines may have sealing defects. Directly connecting the outer sheaths and insulation layers of new and old pipelines poses a risk that the insulation layer of the new pipeline may be damaged in a short period of time due to water seepage into the insulation layer of the old pipeline.

[0003] In the repair of insulation layers on centralized heating pipelines, a similar problem arises when connecting repaired and unrepaired pipelines. To prevent the repaired pipeline from suffering further damage due to sealing defects in the old pipeline, it is necessary to isolate the connection point between the repaired and unrepaired pipelines with insulation layers to protect the project's achievements.

[0004] For newly constructed pipelines that have adopted the Nordic system for pipeline leak monitoring, when connecting pipelines in different monitoring zones, direct connection of the insulation layer may cause mutual interference due to sealing defects in the outer protective pipe. Insulation layer separation and isolation measures are also required at the connection points of the monitoring zones.

[0005] In the current construction of regional heating pipelines, no segmented isolation measures have been taken at the connection points that require insulation layer separation, as mentioned above. This has created a risk that water ingress into old pipelines can lead to secondary damage to newly built or repaired pipelines in a short period of time. This cascading damage is particularly noticeable in high water level environments.

[0006] During the construction of district heating pipeline projects, it is imperative to implement insulation layer separation and isolation measures at connection points between new and old pipelines, between newly repaired and unrepaired pipelines, between pipelines with and without monitoring measures, and between pipelines in different monitoring zones with monitoring measures. The structure and installation method provided by this invention specifically solve the above-mentioned problems. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a thermal insulation layer isolation pipe fitting and its installation method for district heating pipelines. This invention can be used as a waterproof sealing isolation pipe fitting between newly built / repaired pipelines and old pipelines in centralized heating / cooling pipeline construction or repair projects. The thermal insulation layer isolation pipe fitting is used to completely waterproof and seal the thermal insulation layer between the newly built / repaired pipeline and the old pipeline, preventing water ingress into the old pipeline's insulation layer and causing extended damage to the insulation layer of the newly built / repaired pipeline, thus protecting the insulation layer of the newly built / repaired pipeline. This invention is also applicable to the segmented isolation of insulation layers between pipe sections with and without pipeline leakage monitoring measures.

[0008] The technical means employed in this invention are as follows:

[0009] A district heating pipeline insulation layer partition fitting includes: a medium conveying steel pipe, a steel sealing plate, a sealing rubber ring, a sealing ring plate, a pressure plate, a tightening plate, fasteners, and a wing ring. Both ends of the medium conveying steel pipe are connected to the pipeline to be connected. The steel sealing plate is fitted onto the outside of the medium conveying steel pipe, and a groove for accommodating the sealing rubber ring is formed on the steel sealing plate. The sealing ring plate and the pressure plate are sequentially fitted onto the medium conveying steel pipe. The tightening plate is fitted onto the medium conveying steel pipe with a predetermined distance between it and the pressure plate. Fasteners passing through the tightening plate press the pressure plate onto the steel sealing plate, causing the sealing ring plate to be pressed against it. The wing ring is fitted onto the outer layer of the steel sealing plate, sealing rubber ring, sealing ring plate, pressure plate, and tightening plate, thus completing the insulation layer connection between the outer layer of the medium conveying steel pipe and the pipeline to be connected.

[0010] Furthermore, the sealing ring plate has a boss for positioning the wing ring during installation.

[0011] Furthermore, the clamping plate is a steel disc, the tightening plate is a steel disc with circumferentially distributed threaded holes, and the fastener is a fully threaded internal hexagonal high-strength bolt.

[0012] Furthermore, the outer diameter of the wing ring is the same as that of the outer protective pipe of the connected insulation pipe, and the wing ring is welded to the sealing ring plate.

[0013] The present invention also provides a method for installing insulation layer partition pipe fittings for district heating pipelines, comprising the following steps:

[0014] Step 1: Prepare a medium conveying steel pipe that matches the size of the pipes to be connected, based on the distance and diameter between the pipes.

[0015] Step 2: Process the various components installed on the steel pipe according to its dimensions;

[0016] Step 3: After positioning and assembling the steel sealing plate and the medium conveying steel pipe, weld the two together;

[0017] Step 4: Adhere the sealing ring to the groove of the sealing strip on the sealing plate;

[0018] Step 5: Fit the sealing ring plate onto the medium conveying steel pipe and make it fit against the rubber ring groove side of the sealing surface of the sealing plate;

[0019] Step 6: Fit the clamping plate onto the medium conveying steel pipe and make it abut against the side of the sealing ring plate facing the clamping plate;

[0020] Step 7: Place the tensioning plate onto the medium conveying steel pipe, located outside the pressure plate and maintaining a preset distance from the pressure plate, and then fix the tensioning plate.

[0021] Step 8: Position the wing ring using the protrusions on both sides of the sealing ring plate as positioning references, and weld it to the entire circumference of the sealing ring plate.

[0022] Step 9: Install the bolts through the threaded holes of the upper tightening plate. After applying the preset preload, push and squeeze the tightening plate to make the sealing ring plate bite into the sealing groove. Fit the surface of the sealing ring plate with the surface of the sealing plate, and then weld the bolts. Then install the wing ring and the insulation pipes on both sides.

[0023] Furthermore, in step 3, the weld between the assembled steel sealing plate and the medium conveying steel pipe needs to be subjected to dye penetrant testing, and welding defects need to be repaired until the test is qualified.

[0024] Furthermore, following step 9, the following steps are also included:

[0025] Step 10: Weld the insulation layer partition pipe fitting to the medium conveying steel pipe of the insulation pipe on both sides according to the engineering welding process requirements. The upper tightening plate of the partition pipe fitting is connected to the newly built / repaired pipeline on one side and to the old pipeline on the other side.

[0026] Furthermore, following step 10, the following steps are also included:

[0027] Step 11: Connect the wing ring of the partition pipe fitting on the sealing plate side to the high-density polyethylene outer protective pipe on the side connected to the old pipe for joint repair.

[0028] Furthermore, following step 11, the following steps are also included:

[0029] Step 12: Open the airtightness test hole for the completed outer protective pipe joint and conduct an air pressure sealing test. After confirming that the test is qualified, install the wing ring on the other side of the partition pipe fitting to the outer protective pipe joint of the insulation pipe on the other side, and then conduct the same airtightness test.

[0030] Furthermore, after the wing ring and the insulation pipes on both sides are installed, the joints connecting the partition pipe to the insulation pipe on both sides are foamed using the injection process to form an insulation layer at the joint position. Then, the foam injection hole is welded and sealed using welding, and the injection hole plug, weld and joint sleeve are covered by extrusion welding using a temperature-controlled extrusion welding process.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] This invention enables the insulation layer at the pipe connection points of new and repaired district heating pipeline projects, as well as monitoring zones of new pipeline projects, to be effectively isolated in a reliable waterproof and sealing manner. This avoids the problem of water ingress into old pipelines leading to damage to new or repaired pipelines, and also prevents cascading damage caused by defects in the outer protective pipe at the connection points between monitoring zones.

[0033] This invention solves the practical problems existing in district heating pipeline projects, meets the need for insulation layer partition sealing in projects, and fills the product gap of insulation layer partition sealing components in the field of district heating pipelines.

[0034] This invention enables the installation of insulation layer isolation and sealing components without interrupting the flow of the medium transport pipeline through corresponding changes in the components. It has targeted and practical significance for in-situ replacement and repair projects of insulation pipes. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a structural diagram of the insulation layer partition sealing pipe fitting for the regional heating pipeline of the present invention.

[0037] Figure 2 This is a structural diagram of the steel pipe for transporting the medium according to the present invention.

[0038] Figure 3 This is a schematic diagram of the steel sealing plate structure of the present invention.

[0039] Figure 4 This is a schematic diagram of the sealing ring plate of the present invention.

[0040] Figure 5 This is a schematic diagram of the clamping disc of the present invention.

[0041] Figure 6This is a schematic diagram of the upper tensioning plate of the present invention.

[0042] Figure 7 This is a schematic diagram of the wing ring of the present invention.

[0043] Figure 8 This is a schematic diagram of the installation of the sealing ring of the present invention.

[0044] Figure 9 This is a schematic diagram of the installation of the clamping plate of the present invention.

[0045] Figure 10 This is a schematic diagram of the positioning and installation of the upper clamping plate according to the present invention.

[0046] Figure 11 This is a schematic diagram of the installation and tightening of the wing ring and fasteners of the present invention.

[0047] Figure 12 This is a schematic diagram of the connection between the partition pipe and the insulation pipe of the present invention.

[0048] Figure 13 This is a complete schematic diagram of the partition pipe fitting wing ring and the outer protective pipe of the insulation pipe after installation.

[0049] In the diagram: 1. Medium conveying steel pipe; 2. Wing ring; 3. Fastener; 4. Tightening plate; 5. Pressing plate; 6. Sealing ring plate; 7. Steel sealing plate; 8. Sealing rubber ring; 9. Insulated pipe; 10. Welded joint connecting the medium conveying steel pipe to the insulation layer partition sealing pipe fitting; 11. Joint connecting the outer protective pipe of the insulation pipe and the insulation layer partition sealing pipe fitting. Detailed Implementation

[0050] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0054] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0055] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0056] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0057] like Figure 1 As shown in the figure, an embodiment of the present invention discloses a thermal insulation layer partition pipe fitting for a district heating pipeline, comprising: a medium conveying steel pipe 1, a steel sealing plate 7, a sealing rubber ring 8, a sealing ring plate 6, a pressing plate 5, a tightening plate 4, fasteners 3, and a wing ring 2. The two ends of the medium conveying steel pipe are respectively connected to the pipeline to be connected. The steel sealing plate is sleeved on the outside of the medium conveying steel pipe. The steel sealing plate has a groove for accommodating the sealing rubber ring. The sealing ring plate and the pressing plate are sequentially sleeved on the medium conveying steel pipe. The tightening plate is sleeved on the medium conveying steel pipe and there is a preset distance between it and the pressing plate. The pressing plate is pressed onto the steel sealing plate by the fastener passing through the tightening plate, which drives the sealing ring plate to be pressed onto the steel sealing plate. The wing ring is sleeved on the outer layer of the steel sealing plate, the sealing rubber ring, the sealing ring plate, the pressing plate, and the tightening plate. The wing ring completes the connection of the thermal insulation layer between the outer layer of the medium conveying steel pipe and the pipeline to be connected.

[0058] like Figure 2 As shown, the medium conveying steel pipe is a steel pipe, with the same material and specifications as the insulated pipe. (See figure.) This refers to the outer diameter of the steel pipe used for transporting the medium.

[0059] like Figure 3 As shown, the steel sealing plate is a steel disc with a groove for a sealing rubber ring, which is sealed and welded to the medium conveying steel pipe. The diameter of the steel pipe used for transporting the medium is increased by 3 to 4 mm during actual processing to avoid assembly interference.

[0060] The top width of the groove in the sealing strip is 1mm. The sealing ring is an 8mm x 8mm silicone rubber sealing ring.

[0061] like Figure 4 As shown, the sealing ring plate is a ring made of high-density polyethylene material that meets the standard GB / T29047, and the sealing ring plate has a boss for mounting and positioning the wing ring.

[0062] like Figure 5 As shown, the clamping plate is a steel disc used to contact and press the sealing ring plate and the steel sealing plate together.

[0063] like Figure 6 As shown, the tightening disc is a steel disc with evenly distributed threaded holes around its circumference, and it is welded and fixed to the medium conveying steel pipe. The number n and spacing of the threaded holes are determined according to the outer diameter of the specific medium conveying steel pipe and the required clamping force. The fastener is a fully threaded internal hexagonal high-strength bolt, used to apply force through the tightening disc to the clamping disc, thereby pressing the sealing ring plate tightly against the sealing plate. The specific specifications are adjusted according to the actual application.

[0064] like Figure 7 As shown, the wing ring is a cylinder made of high-density polyethylene material that meets the standard GB / T29047, and its outer diameter is the same as that of the outer protective pipe of the connected insulation pipe. (See figure.) Determined based on the wall thickness of the outer protective pipe of the insulation pipe.

[0065] This invention uses a pressing plate to press the sealing ring plate and the surface of the sealing plate firmly together, causing the quick-cut end of the sealing plate to be pressed into the sealing ring plate, thereby compressing the sealing strip to achieve a waterproof seal. The surface of the sealing plate facing the sealing ring plate is the sealing surface, and the weld joint between it and the medium-transporting steel pipe must ensure strength and a strict seal.

[0066] The embodiments of the present invention also disclose the production method and installation method of the above-mentioned device. Taking the production of the insulation layer partition pipe fitting as an example, the production of the product of the present invention and its application and installation in the engineering site include the following steps: cutting the medium conveying steel pipe, processing the various parts of the insulation layer partition pipe fitting, welding the steel sealing plate to the medium conveying steel pipe, colorimetric inspection of the weld of the sealing plate, installation of the sealing ring, installation of the sealing ring plate, installation of the pressure plate, positioning and installation of the tightening plate, welding and installation of the wing ring, installation and tightening of fasteners, and on-site installation.

[0067] The process of cutting the medium conveying steel pipe involves cutting the required length of steel pipe from the steel pipe material according to the size requirements of the medium conveying steel pipe and performing pipe end beveling.

[0068] The components of the insulation layer partition pipe are processed according to... Figures 2-7The drawings of each component shown complete the processing of all parts of the insulation layer partition pipe fitting, and complete the pre-assembly preparation work.

[0069] The steel sealing positioning plate is welded to the medium conveying steel pipe by first positioning and assembling the steel sealing positioning plate and the medium conveying steel pipe, and then welding the two together. The positioning position of the steel sealing positioning plate is such that the side with the sealing rubber ring groove is aligned with the center line of the medium conveying steel pipe. Both sides of the steel sealing positioning plate are welded to the medium conveying steel pipe by fillet welds, and the welding adopts argon-electric welding process.

[0070] The dye penetrant testing of the sealing plate welds involves applying dye penetrant testing to the fillet welds between the two sides of the sealing plate and the medium conveying steel pipe, repairing any welding defects until the test is passed. The purpose of this testing is to ensure weld quality and sealing performance.

[0071] like Figure 8 As shown, the sealing ring is installed by inserting an 8mm x 8mm rectangular silicone rubber sealing ring into the groove of the sealing strip on the sealing plate. The silicone rubber ring joint is bonded with silicone rubber adhesive.

[0072] The sealing ring plate is installed by fitting a high-density polyethylene sealing ring plate onto the medium conveying steel pipe and making it abut against the edge of the rubber ring groove on the sealing surface of the sealing plate.

[0073] like Figure 12 As shown, the clamping plate is installed by fitting the clamping plate onto the medium conveying steel pipe and having it abut against the surface of the high-density polyethylene sealing ring plate facing the clamping plate.

[0074] like Figure 10 As shown, the upper tensioning plate is positioned and installed by fitting the upper tensioning plate onto the medium conveying steel pipe, located outside the pressure plate and maintaining a net distance of 20-30mm from the pressure plate. After spot welding the upper tensioning plate to the medium conveying steel pipe for positioning, the two sides of the upper tensioning plate are welded and fixed to the medium conveying steel pipe.

[0075] The wing ring welding installation involves positioning the wing ring with the protrusions on both sides of the sealing ring plate as positioning references, and then using a temperature-controlled extrusion welding process to weld the wing ring to the sealing ring plate around its entire circumference.

[0076] like Figure 11 As shown, the fastener installation and tightening involves installing fully threaded hexagonal high-strength bolts through the threaded holes of the tightening disc and pressing them into the clamping disc, causing the sealing ring plate to engage with the sealing groove and ensuring the surface of the sealing ring plate is flush with the surface of the sealing disc. After all the bolts around the circumference are installed and secured in place, the bolts are spot-welded to the tightening disc to prevent them from loosening. At this point, the assembly of the insulation layer partition pipe fittings is complete.

[0077] like Figure 12As shown, in the pipeline installation construction site, the insulation layer partition pipe fitting is welded to the medium conveying steel pipe of the insulation pipes 9 on both sides according to the engineering welding process requirements 10. The installation direction of the partition pipe fitting is: one side of the upper tightening plate of the partition pipe fitting is connected to the newly built / repaired pipeline, and the other side is connected to the old pipeline.

[0078] Next, a jointing operation 11 is performed to connect the wing ring of the partition pipe fitting on the sealing plate side to the high-density polyethylene outer protective pipe on the side connected to the old pipe. The jointing operation includes the overlapping circumferential welding connection and the butt longitudinal welding process of the high-density polyethylene outer protective pipe. This invention preferentially adopts the TSC jointing process for the welding and installation process of the jointed outer protective pipe.

[0079] Next, an airtightness test was conducted. An airtightness test hole was opened at the completed outer protective pipe joint, and a pressure test was performed at 0.2 Bar for 2 minutes. During the airtightness test, all weld seams at the joint were inspected with soapy water to confirm there were no leaks. Under this condition, airtightness checks were continued. If pressure could not be maintained, the fastening bolts were tightened evenly around the circumference of the clamping plate on the partition fitting until there was no pressure drop within the airtightness test's pressure holding time.

[0080] Subsequently, the TSC splicing process is used to connect the wing ring on the upper tightening disc side of the partition pipe fitting to the insulation pipe connected to this side as an outer protective pipe splice. For example... Figure 13 As shown, after the joint welding is completed, an airtight test is conducted in the same manner as the airtight test of the aforementioned partition components. After all airtight tests are passed, a foaming process is used to foam the joints connecting the partition pipes to the insulation pipes on both sides to form an insulation layer at the joint location. Then, the foaming injection holes are welded and sealed, and a temperature-controlled extrusion welding process is used to extrude and weld the injection hole plugs, welds, and local surfaces of the joint sleeve.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A partition fitting for insulation layer of a district heating pipeline, characterized in that, The system includes a medium-transporting steel pipe, a steel sealing plate, a sealing ring, a sealing ring plate, a pressure plate, a tightening plate, fasteners, and a wing ring. Both ends of the medium-transporting steel pipe are connected to the pipe to be connected. The steel sealing plate is fitted onto the outside of the medium-transporting steel pipe and has a groove for accommodating the sealing ring. The sealing ring plate and the pressure plate are sequentially fitted onto the medium-transporting steel pipe. The tightening plate is fitted onto the medium-transporting steel pipe at a predetermined distance from the pressure plate. Fasteners passing through the tightening plate press the pressure plate onto the steel sealing plate, causing the sealing ring plate to be pressed against it. The wing ring is fitted onto the outer layer of the steel sealing plate, sealing ring, sealing ring plate, pressure plate, and tightening plate, thus completing the connection between the outer layer of the medium-transporting steel pipe and the insulation layer of the pipe to be connected.

2. The insulation layer partition pipe fitting for district heating pipelines according to claim 1, characterized in that, The sealing ring plate has a boss for positioning the wing ring during installation.

3. The insulation layer partition pipe fitting for district heating pipelines according to claim 1, characterized in that, The clamping plate is a steel disc, the tightening plate is a steel disc with evenly distributed threaded holes around its circumference, and the fastener is a fully threaded internal hexagonal high-strength bolt.

4. The insulation layer partition pipe fitting for district heating pipelines according to claim 1, characterized in that, The outer diameter of the wing ring is the same as that of the outer protective pipe of the connected insulation pipe, and the wing ring is welded to the sealing ring plate.

5. A method for installing insulation layer partition pipe fittings in a district heating pipeline, characterized in that, Includes the following steps: Step 1: Based on the distance and pipe diameter between the pipes to be connected, prepare a medium conveying steel pipe that matches the distance and pipe diameter; Step 2: Process the various components installed on the steel pipe according to its dimensions; Step 3: After positioning and assembling the steel sealing plate and the medium conveying steel pipe, weld the two together; Step 4: Adhere the sealing ring to the groove of the sealing strip on the sealing plate; Step 5: Fit the sealing ring plate onto the medium conveying steel pipe and make it fit against the rubber ring groove side of the sealing surface of the sealing plate; Step 6: Fit the clamping plate onto the medium conveying steel pipe and make it abut against the side of the sealing ring plate facing the clamping plate; Step 7: Place the tensioning plate onto the medium conveying steel pipe, located outside the pressure plate and maintaining a preset distance from the pressure plate, and then fix the tensioning plate. Step 8: Position the wing ring using the protrusions on both sides of the sealing ring plate as positioning references and weld it to the entire circumference of the sealing ring plate. Step 9: Install the bolts through the threaded holes of the upper tightening plate. After applying the preset preload, push and squeeze the tightening plate to make the sealing ring plate bite into the sealing groove. Fit the surface of the sealing ring plate with the surface of the sealing plate, and then weld the bolts. Then install the wing ring and the insulation pipes on both sides.

6. The method according to claim 5, characterized in that, In step 3, the weld between the assembled steel sealing plate and the medium conveying steel pipe needs to be subjected to dye penetrant testing, and welding defects need to be repaired until the test is qualified.

7. The method according to claim 6, characterized in that, Following step 9, the following steps are also included: Step 10: Weld the insulation layer partition pipe fitting to the medium conveying steel pipe of the insulation pipe on both sides according to the engineering welding process requirements. The upper tightening plate of the partition pipe fitting is connected to the newly built / repaired pipeline on one side and to the old pipeline on the other side.

8. The method according to claim 7, characterized in that, Following step 10, the following steps are also included: Step 11: Connect the wing ring of the partition pipe fitting on the sealing plate side to the high-density polyethylene outer protective pipe on the side connected to the old pipe for joint repair.

9. The method according to claim 8, characterized in that, Following step 11, the following steps are also included: Step 12: Open the airtightness test hole for the completed outer protective pipe joint and conduct an air pressure sealing test. After confirming that the test is qualified, install the wing ring on the other side of the partition pipe fitting to the outer protective pipe joint of the insulation pipe on the other side, and then conduct the same airtightness test.

10. The method according to any one of claims 5 to 9, characterized in that, After the wing ring and the insulation pipes on both sides are installed, the joints connecting the partition pipe to the insulation pipe on both sides are foamed to form an insulation layer at the joint. Then, the foam injection hole is welded and sealed, and the injection hole plug, weld and joint sleeve are covered by extrusion welding with temperature control.

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