Composite pipe sleeve for temporary sealing of steam pipe joints

Abstract

The utility model provides a kind of composite pipe sleeve for steam pipeline joint temporary sealing, there is annular gap between the thermal insulation layer of two ends at weld in turn with thermal insulation layer and outer sleeve steel pipe on the outer surface of working steel pipe, composite pipe sleeve is multilayer sleeve structure for slidingly sleeving on the outer diameter of thermal insulation pipeline, multilayer sleeve structure is equipped with plastic film cover, metal sleeve, EPE foam cover in turn from inside to outside, the axial length of plastic film cover is greater than the width of annular gap;The length of plastic film cover, metal sleeve, EPE foam cover gradually reduces to form stepped end at both ends of composite pipe sleeve;Annular gap is sealed by sliding composite pipe sleeve, the gap between plastic film cover end and outer sleeve steel pipe outer wall, and the gap between metal sleeve end and plastic film cover outer wall are all sealed by waterproof adhesive tape.The utility model provides a kind of composite pipe sleeve for steam pipeline joint temporary sealing, with remarkable technical effect and practical value, can be widely applied in the construction and maintenance of steam thermal insulation pipe network.

Description

Technical Field

[0001] This utility model relates to steam insulation pipeline networks, specifically to a composite pipe sleeve for temporary sealing of steam pipeline joints. Background Technology

[0002] Pre-insulated direct-buried steam pipelines are crucial infrastructure, forming part of centralized heating and combined heat and power (CHP) systems. They operate continuously year-round, transporting large quantities of heat energy. Introduced in the 1980s and 90s, they have been in use for over thirty years, with their performance continuously improving. However, rainwater immersion in the pipeline insulation layer leads to severe deterioration of insulation performance and a significant reduction in pipeline lifespan—a problem that continues to plague the industry and remains a major challenge. This is because pipeline joint welding construction, inspection, joint insulation, and joint closure involve product manufacturing, earthwork engineering, pipeline installation, quality control, weld quality inspection, and system tightness testing. During the handover phase between these departments, heavy rainfall often results in the main insulation layer of the pipeline and the insulation at the joints being submerged in water, with serious consequences. Utility Model Content

[0003] This utility model provides a composite pipe sleeve for temporary sealing of steam pipe joints. The insulated pipe includes several working steel pipes welded end to end. An insulation layer and an outer steel pipe are sequentially provided on the outer surface of the working steel pipes. There is a gap between the insulation layers at both ends of the weld to form an annular gap that exposes the weld.

[0004] The composite pipe sleeve is a multi-layered sleeve structure that slides on the outer diameter of the insulated pipe. The multi-layered sleeve structure consists of a plastic film sleeve, a metal sleeve, and an EPE foam sleeve from the inside out. The axial length of the plastic film sleeve is greater than the width of the annular gap.

[0005] The lengths of the plastic film sleeve, metal sleeve, and EPE foam sleeve gradually decrease to form stepped ends at both ends of the composite pipe sleeve.

[0006] The annular gap is sealed by sliding the composite sleeve. The gap between the end of the plastic film sleeve and the outer wall of the outer steel pipe, as well as the gap between the end of the metal sleeve and the outer wall of the plastic film sleeve, are all sealed with waterproof tape.

[0007] Furthermore, the two ends of the plastic film sleeve are 10mm to 20mm longer than the metal sleeve, the two ends of the metal sleeve are 10mm to 20mm longer than the EPE foam sleeve, and the axial length of the EPE foam sleeve is 100mm to 200mm greater than the width of the annular gap.

[0008] Furthermore, the thickness of the EPE foam sleeve is 10–30 mm.

[0009] Furthermore, the thickness of the metal sleeve is 0.5mm to 1.0mm.

[0010] Furthermore, the thickness of the plastic film sleeve is 0.1mm to 0.5mm.

[0011] Furthermore, the plastic film sleeve is made of polyethylene film.

[0012] The composite pipe sleeve of this invention has a simple structure, is easy to operate, and has a good temporary sealing effect. During the temporary sealing process of steam pipe joints, the multi-layered sleeve structure of the composite pipe sleeve can effectively prevent rainwater or other liquids from seeping into the insulation layer, thereby protecting the insulation performance of the pipeline and extending the service life of the pipeline network.

[0013] The innermost layer, a plastic film sleeve, offers excellent waterproofing and a degree of elasticity, allowing it to fit snugly against the outer diameter of the insulated pipe, forming a preliminary sealing barrier. The metal sleeve provides additional strength and stability, ensuring the composite pipe sleeve is not easily damaged during sliding and installation. The outermost layer, an EPE foam sleeve, not only provides good cushioning and shock absorption but also further isolates the pipe from external moisture and humidity.

[0014] In addition, the stepped end design at both ends of the composite sleeve allows for sealing at each end with two layers of waterproof tape, enhancing the sealing effect.

[0015] In summary, the composite pipe sleeve for temporary sealing of steam pipe joints provided by this utility model has significant technical effects and practical value, and can be widely used in the construction and maintenance of steam insulation pipe networks. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional view of the unwelded closed outer steel pipe of an insulated pipe in the prior art;

[0018] Figure 2 A schematic diagram of a composite pipe sleeve provided by this utility model being used to cover an insulated pipe;

[0019] Figure 3 A schematic diagram showing the sealing of the joint of an insulated pipe after the sliding composite pipe sleeve has been used to seal the gap.

[0020] Figure 4 for Figure 3 Enlarged view of point A in the middle. Detailed Implementation

[0021] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0022] To fully understand this utility model, detailed steps and structures will be presented in the following description to illustrate the technical solution of this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0023] Before the finished steam pipes leave the factory, waterproof end seals are installed at both ends of the pipes. These seals prevent water from entering the insulation layer 2 before the pipe assembly and welding work begins. However, the waterproof end seals do not protect the joint insulation layer 2. If the waterproof end seals are removed before the outer steel pipe 3 outside the insulation layer 2 is closed, the main insulation layer of the pipe will be unprotected and may still be susceptible to water immersion.

[0024] To prevent rain damage during the handover of various work operations, this utility model provides a composite pipe sleeve for temporary sealing of steam insulation pipe joints. The composite pipe sleeve can close the insulation pipe joint at any time. If there are subsequent construction processes, the joint area can be reopened until the outer sleeve is finally sealed.

[0025] Reference Figure 1-4 As shown, this utility model provides a composite pipe sleeve for temporary sealing of steam pipe joints. The steam pipe includes several working steel pipes 1 connected end to end by welding. An insulation layer 2 and an outer steel pipe 3 are sequentially provided on the outer surface of the working steel pipe 1. There is a gap between the insulation layers 2 at both ends of the weld 4 to form an annular gap 8 that exposes the weld 4.

[0026] The composite sleeve is a multi-layered sleeve structure that slides onto the outer diameter of the steam pipe. From the inside out, the multi-layered sleeve structure consists of a plastic film sleeve 5, a metal sleeve 6, and an EPE (pearl cotton) foam sleeve 7. The axial length of the plastic film sleeve 5 is greater than the width of the annular gap 8 to ensure complete coverage of the annular gap 8. The plastic film sleeve 5 is made of polyethylene membrane, which has excellent waterproof performance. The plastic film sleeve 5 is completely seamless in the circumferential direction to ensure impermeability. The metal sleeve 6 is welded from a full steel plate and is impermeable in the radial direction.

[0027] like Figure 4As shown, the lengths of the plastic film sleeve 5, metal sleeve 6, and EPE foam sleeve 7 gradually decrease to form stepped ends at both ends of the composite tube sleeve. Preferably, the two ends of the plastic film sleeve 5 are 10mm to 20mm longer than the metal sleeve 6, the two ends of the metal sleeve 6 are 10mm to 20mm longer than the EPE foam sleeve 7, and the axial length of the EPE foam sleeve 7 is 100mm to 200mm greater than the width of the annular gap 8. Figure 4 As shown, the width of the EPE foam sleeve 7 on one side and the annular gap 8 is 50~100 mm, meaning the overall axial length of the EPE foam sleeve 7 is 100 mm to 200 mm greater than the width of the annular gap 8. The ends of the composite sleeve adopt a stepped design, and each end of the composite sleeve can be sealed with two layers of waterproof tape to ensure waterproof performance.

[0028] In a preferred embodiment, the two ends of the plastic film sleeve 5 are each 20mm longer than the metal sleeve 6, and the two ends of the metal sleeve 6 are each 20mm longer than the EPE foam sleeve 7. The axial length of the EPE foam sleeve 7 is greater than the width of the annular gap 8 by 200mm. The plastic film sleeve 5 has a thickness of 0.5mm, the metal sleeve 6 has a thickness of 1.0mm, and the EPE foam sleeve 7 has a thickness of 20mm. Figure 4 As shown.

[0029] During use, the composite pipe sleeve is slid to completely cover the annular gap 8. The gaps between the end of the plastic film sleeve 5 and the outer wall of the outer steel pipe 3, and between the end of the metal sleeve 6 and the outer wall of the plastic film sleeve 5, are all sealed with waterproof tape, ensuring no leaks in either the gaps between the plastic film sleeve 5 and the outer steel pipe 3, or between the plastic film sleeve 5 and the metal sleeve 6. After installation, the sealing effect can be verified by checking for a tight seal with the waterproof tape and for any looseness or deformation of the composite pipe sleeve. To disassemble the composite pipe sleeve, simply tear off the waterproof tape and slide the composite pipe sleeve axially along the steam pipe; the operation is simple and quick. Furthermore, the composite pipe sleeve's design allows for reuse, reducing operating costs and improving economic efficiency.

[0030] During the shipping and storage stages of steam insulation pipes, the composite pipe sleeve serves to prevent impacts and scratches. During the trenching and assembly stage of the insulation pipes, during the intervals between different work operations, the composite pipe sleeve can be slid down to cover the annular gap 8 of the pipe joint, and both ends are sealed with sealing tape to achieve temporary waterproofing. When proceeding to the next step, the tape is removed and the composite pipe sleeve is removed. This process can be repeated multiple times until the outer steel pipe 3 is welded closed, at which point the rainproof sleeve's function is complete.

[0031] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above. Devices and structures not described in detail herein should be understood as being implemented in a conventional manner within the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of this utility model using the disclosed methods and techniques, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. This does not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, still fall within the protection scope of the technical solution of this utility model.

Claims

1. A composite pipe sleeve for temporary sealing of a steam pipe joint, wherein the insulated pipe comprises a plurality of working steel pipes (1) welded end to end, an insulation layer (2) and an outer steel pipe (3) are sequentially provided on the outer surface of the working steel pipes (1), and an annular gap (8) is provided between the insulation layers (2) at both ends of the weld (4) to expose the weld (4), characterized in that, The composite sleeve is a multi-layer sleeve structure that is slidably sleeved on the outer diameter of the heat-insulating pipe. The multi-layer sleeve structure is provided with a plastic film sleeve (5), a metal sleeve (6), and an EPE foam sleeve (7) from the inside to the outside. The axial length of the plastic film sleeve (5) is greater than the width of the annular gap (8). The lengths of the plastic film sleeve (5), the metal sleeve (6), and the EPE foam sleeve (7) gradually decrease to form stepped ends at both ends of the composite tube sleeve; The annular gap (8) is sealed by sliding the composite sleeve. The gap between the end of the plastic film sleeve (5) and the outer wall of the outer steel pipe (3), as well as the gap between the end of the metal sleeve (6) and the outer wall of the plastic film sleeve (5), are sealed with waterproof tape.

2. The composite pipe sleeve for temporary sealing of steam pipe joints as described in claim 1, characterized in that, The two ends of the plastic film sleeve (5) are 10mm to 20mm longer than the metal sleeve (6), the two ends of the metal sleeve (6) are 10mm to 20mm longer than the EPE foam sleeve (7), and the axial length of the EPE foam sleeve (7) is 100mm to 200mm greater than the width of the annular gap (8).

3. A composite pipe sleeve for temporary sealing of steam pipe joints as described in claim 1, characterized in that, The thickness of the EPE foam sleeve (7) is 10-30 mm.

4. A composite pipe sleeve for temporary sealing of steam pipe joints as described in claim 1, characterized in that, The thickness of the metal sleeve (6) is 0.5mm to 1.0mm.

5. A composite pipe sleeve for temporary sealing of steam pipe joints as described in claim 1, characterized in that, The thickness of the plastic film sleeve (5) is 0.1mm to 0.5mm.

6. A composite pipe sleeve for temporary sealing of steam pipe joints as described in claim 1, characterized in that, The plastic film sleeve (5) is a polyethylene film.

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