CN219140203U

CN219140203U - Epoxy sleeve for repairing pipeline

Info

Publication number: CN219140203U
Application number: CN202223476515.8U
Authority: CN
Inventors: 杨阳; 路民旭; 侯世颖; 高荣钊; 吴京州; 陈真
Original assignee: Beijing Safetech Pipeline Co Ltd
Current assignee: Beijing Safetech Pipeline Co Ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-06-06
Anticipated expiration: 2032-12-26

Abstract

The utility model provides an epoxy sleeve for repairing a pipeline. The epoxy sleeve comprises a first semicircular sleeve and a second semicircular sleeve, wherein the first semicircular sleeve comprises a first long flange which vertically extends from two longitudinal edges of the first semicircular sleeve respectively, and the second semicircular sleeve comprises a second long flange which vertically extends from two longitudinal edges of the second semicircular sleeve respectively.

Description

Epoxy sleeve for repairing pipeline

Technical Field

The utility model relates to an epoxy sleeve for repairing a pipeline.

Background

Pipeline transportation is one of five transportation modes in the world today. In-service pipelines inevitably cause local thinning or missing of pipelines due to the reasons of girth weld welding defects, corrosion, abrasion, accidental damage during service and the like, so that the bearing capacity is reduced or perforation, cracking and breakage occur, and oil gas leakage and even explosion accidents are caused.

Timely repair of defective pipelines is an important means of ensuring pipeline integrity and life extension. The proper maintenance method can ensure the safe operation of the pipeline and save a great deal of operation and maintenance cost. The maintenance and repair methods of different pipeline defects comprise polishing, repair welding, A-type sleeve, B-type sleeve, steel epoxy sleeve, composite material reinforcement, mechanical clamp, patching, punching under pressure, pipe replacement and the like. In the actual operation of the pipeline, due to the improvement of the safety requirement of pipeline management, part of methods such as polishing, repair welding and patching are rarely used, and mainly because the methods have certain limitations in operation, open fire is easy to generate, and potential safety hazards exist for the pipeline in maintenance. In addition, the mechanical clamp has high maintenance cost, is complex to operate, requires large-scale machines to be used during construction, and is rarely used in daily maintenance. The main methods commonly used for repairing the defects of the current pipeline are B-type sleeve, steel epoxy sleeve and composite material reinforcement.

The epoxy sleeve repairing technology can avoid the safety problem caused by welding on the running pipeline, can ensure high safety and integrity, can reduce the influence of repairing operation on the safety of the pipeline to the minimum, and is accepted by multiple pipeline enterprises worldwide and widely applied. In addition, the epoxy sleeve repairing technology has the advantages of 'no fire movement and no transportation stop', and has larger economic and social benefits compared with other repairing methods (B-type sleeve and pipe replacement).

Fig. 1 shows a prior art steel epoxy sleeve. The epoxy sleeve comprises two semicircular steel epoxy sleeves which are sleeved at the defect part of the pipeline to be repaired and keep a certain gap with the outer wall of the pipeline through positioning bolts, then the end parts at the two ends of the epoxy sleeve are sealed by end face sealant 1, finally epoxy filler 2 is poured into the gap between the epoxy sleeve and the pipeline through filler filling holes 5, when the exhaust holes 3 overflow the epoxy filler, pouring is stopped, after the epoxy filler is solidified, radial expansion and hoop stress born by the defect part of the pipeline are transferred to the external epoxy sleeve, and the defect parts of the epoxy sleeve and the pipeline bear the stress together, so that the normal bearing capacity of the pipeline is restored. As shown in fig. 1, a plurality of positioning holes 4, which may be screw holes, for example, are provided on both sides of the steel epoxy sleeve in the circumferential direction, and positioning bolts are screwed into these positioning holes 4 and extend through the positioning holes 4 into the interior of the sleeve to respectively abut against the outer surface of the pipe surrounded by the sleeve from a plurality of positions in the circumferential direction. The gap between the steel epoxy sleeve and the circumferential direction of the pipeline is kept consistent by adjusting the length of the positioning bolt extending into the sleeve, so that the gap between the epoxy sleeve and the circumferential direction of the pipeline is adjusted on site through the positioning hole.

The epoxy sleeve shown in fig. 1 has the following problems: 1. the gap between the sleeve and the pipeline is adjusted on site by using the positioning holes, so that the operation is inconvenient, the gap is easy to be uneven, the positioning holes easily cause local stress concentration of the sleeve, and the strength is reduced; 2. the end face sealant is used for sealing the end of the epoxy sleeve, so that the operation is inconvenient, the tightness is not easy to ensure, the end sealing strength is insufficient, and especially, the end sealing is likely to crack and fail when the sleeve bears large axial force; 3. the long flange and the barrel connecting weld joint are stress concentration points and are the most likely positions to fail.

Disclosure of Invention

The epoxy high-compressive-strength filling material is arranged between the epoxy sleeve and the pipeline, and the radial expansion and the hoop stress of the pipeline are transferred to the external sleeve through the filling material, so that the stress of the pipeline is shared together, and the normal bearing capacity of the pipeline is recovered.

The utility model provides an epoxy sleeve for repairing a pipeline, which comprises a first semicircular sleeve and a second semicircular sleeve, wherein the first semicircular sleeve comprises a first long flange which is perpendicularly extended from two longitudinal edges of the first semicircular sleeve respectively, and the second semicircular sleeve comprises a second long flange which is perpendicularly extended from two longitudinal edges of the second semicircular sleeve respectively.

Advantageously, the inner wall of the first semicircular sleeve is further from the outer wall of the pipe than the inner wall of the first semicircular flange to ensure a gap between the first semicircular sleeve and the outer wall of the pipe, and the inner wall of the second semicircular sleeve is further from the outer wall of the pipe than the inner wall of the second semicircular flange to ensure a gap between the second semicircular sleeve and the outer wall of the pipe.

Advantageously, the epoxy sleeve further comprises a plurality of first reinforcing ribs spaced apart along the longitudinal direction of the first semicircular sleeve, each first reinforcing rib extending from the outer surface of the first semicircular sleeve to the first elongate flange.

Advantageously, the epoxy sleeve further comprises a plurality of second reinforcing ribs spaced apart along the longitudinal direction of the second semi-circular sleeve, each second reinforcing rib extending from the outer surface of the second semi-circular sleeve to the second elongate flange.

Advantageously, the surface of the first semicircular flange facing the outer wall of the pipe has a first groove and a first gasket arranged in the first groove to seal the first semicircular flange and the outer wall of the pipe.

Advantageously, the first semicircular flange further comprises a sealing material disposed within the first groove to further seal the first semicircular flange and the outer wall of the pipe.

Advantageously, the surface of the second semicircular flange facing the outer wall of the pipe has a second groove and a second gasket arranged in the second groove to seal the second semicircular flange and the outer wall of the pipe.

Advantageously, the second semicircular flange further comprises a sealing material disposed within the second groove to further seal the second semicircular flange and the outer wall of the pipe.

Advantageously, the first semicircular flange and the first long flange are welded to the first semicircular sleeve, respectively.

Advantageously, the second semicircular flange and the second long flange are welded to the second semicircular sleeve, respectively.

Drawings

The advantages and objects of the present utility model will be better understood in the following detailed description of the preferred embodiments of the utility model, taken in conjunction with the accompanying drawings. To better illustrate the relationship of the various components in the figures, the figures are not drawn to scale. In the accompanying drawings:

FIG. 1 shows a cross-sectional view of a prior art epoxy sleeve;

fig. 2 shows a perspective view of one half of an epoxy sleeve according to the present utility model;

FIG. 3 shows a bottom perspective view of one half of the epoxy sleeve of FIG. 2;

fig. 4 shows a plan view of the other half of the epoxy sleeve according to the utility model;

FIG. 5 shows a top view of one half of the epoxy sleeve of FIG. 2;

fig. 6 shows a bottom view of one half of the epoxy sleeve of fig. 2.

FIG. 7 shows a perspective view of an epoxy sleeve mounted to a pipe according to the present utility model;

FIG. 8 shows a side view of FIG. 7;

FIG. 9 shows a cross-sectional view taken along section line A-A of FIG. 8;

fig. 10 shows a cross-sectional view taken along section line B-B of fig. 9.

Detailed Description

Various embodiments according to the present utility model will be described in detail with reference to the accompanying drawings. Here, it is to be noted that in the drawings, the same reference numerals are given to constituent parts having substantially the same or similar structures and functions, and repeated description thereof will be omitted. The term "comprising A, B, C, etc. in turn" merely indicates the order in which the included elements A, B, C, etc. are arranged, and does not exclude the possibility of including other elements between a and B and/or between B and C.

The drawings in the present specification are schematic views, which assist in explaining the concept of the present utility model, and schematically show the shapes of the respective parts and their interrelationships.

Hereinafter, preferred embodiments according to the present utility model will be described in detail with reference to fig. 2 to 10.

Fig. 2 shows a perspective view of one half of an epoxy sleeve according to the utility model. Fig. 3 shows a perspective view of the other half of the epoxy sleeve according to the utility model. The epoxy sleeve comprises a first semi-circular sleeve 1 and a second semi-circular sleeve 2, and a first long flange 3 and a second long flange 4 extending perpendicularly from the longitudinal edges of the first semi-circular sleeve 1 and the second semi-circular sleeve 2, respectively. In the installation, the first semicircular sleeve 1 and the second semicircular sleeve 2 are installed around a pipe to be repaired and are connected by fastening bolts through the first long flange 3 and the second long flange 4. The epoxy sleeve further comprises a first semicircular flange 6 at both longitudinal edges of the first semicircular sleeve 1 and a second semicircular flange 7 at both longitudinal edges of the second semicircular sleeve 2, the first semicircular flange 6 and the second semicircular flange 7 extending perpendicularly to the longitudinal direction and forming a complete ring shape when the first semicircular sleeve 1 and the second semicircular sleeve 2 are assembled together, the inner diameter of the ring shape being slightly larger than the outer diameter of the pipe to be repaired, the outer diameter of the ring shape being substantially equal to or slightly larger than the outer diameter of the cylinder formed by the first semicircular sleeve 1 and the second semicircular sleeve 2. The epoxy sleeve, long flange and round flange are preferably made of the same material, such as steel, and may be integrally formed by casting or the like or separately formed and then joined together by welding, bonding or the like.

When the epoxy sleeve is mounted to the pipe D (as shown in fig. 7), the first semicircular flange 6 and the second semicircular flange 7 are assembled together to form a complete ring shape and have an inner diameter sized to substantially conform to the pipe outer wall so that a gap 12 is maintained between the epoxy sleeve and the pipe outer wall.

As shown in fig. 3, a first groove 13 is formed on the surface of the first semicircular flange 6 facing the outer wall of the pipe, and a first gasket and a sealing material (not shown) may be disposed in the first groove to seal the first semicircular flange and the outer wall of the pipe, so that a gap between the epoxy sleeve and the outer wall of the pipe maintains good sealing performance. Similarly, a second groove is also formed on the surface of the second semicircular flange 7 facing the outer wall of the pipe, and a second gasket and a sealing material can be disposed in the second groove to seal the second semicircular flange and the outer wall of the pipe, so that the gap between the epoxy sleeve and the outer wall of the pipe maintains good sealing performance. The sealing material is high-strength sealant, and the sealing effect is good.

Advantageously, the surfaces of the first and second long flanges facing the outer wall of the pipe are also provided with grooves for receiving sealing material. Therefore, good tightness between the epoxy sleeve and the outer wall of the pipeline can be ensured, and no air bubbles are introduced during the process of filling the epoxy filler.

A filler injection hole 5 is also provided on the first semicircular sleeve 1 for filling with filler. The second semicircular sleeve 2 is also provided with an exhaust hole 10 and an observation hole 11.

The first semicircular sleeve, the first long flange and the first semicircular flange are connected, for example, by fillet welds, and the second semicircular sleeve, the second long flange and the second semicircular flange are also connected, for example, by fillet welds. It should be appreciated that other means of connecting the first semicircular sleeve, the first long flange, and the first semicircular flange, and connecting the second semicircular sleeve, the second long flange, and the second semicircular flange may be employed.

Advantageously, the inner wall of the first semicircular sleeve 1 is further from the outer wall of the pipe than the inner wall of the first semicircular flange 6, and the inner wall of the second semicircular sleeve 2 is further from the outer wall of the pipe than the inner wall of the second semicircular flange 7, whereby a gap 12 (as shown in fig. 9) between the epoxy sleeve and the outer wall of the pipe is ensured. Epoxy filler may be poured into the gap through filler injection hole 5.

The pouring time is different for different types of epoxy fillers, and the curing time of the epoxy fillers is different.

The viscosity of the epoxy filler is 2.52-2.72 Pa.S, and the density is 1.6-1.8g/cm ³ The pouring time is 25-35min. Epoxy fillers having the above parameters are suitable for priming in this process, and epoxy fillers having the above viscosity and density tend to drive air out of the vent 10.

The preliminary curing time of the epoxy filler at normal temperature is 2-3 hours to ensure sufficient pouring time.

The epoxy sleeve and the round flange matched with the different pipelines can be selected. For example, the pipe diameter of the pipeline can be 100-1620mm, the pipe wall thickness can be 4-30mm, the conveying pressure in the pipeline is less than 10MPa, and the conveying temperature is 0-80 ℃. The epoxy sleeve can be used for repairing corrosion defects on a pipeline with a maximum depth of less than 80% of the thickness of the pipeline wall and dents with a diameter of less than 6% of the pipeline.

Advantageously, the gap between the epoxy sleeve and the outer wall of the pipe is 10-12mm, which may be, for example, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, etc. The size of the gap is set so that the epoxy filler layer with the thickness of 10-12mm can be conveniently obtained through pouring, and the effect of the epoxy filler layer with the thickness for transmitting force is good, so that the epoxy filler layer and the epoxy sleeve can share the load born by the pipeline.

At a plurality of positions spaced apart in the longitudinal direction of the first semicircular sleeve 1, a plurality of first reinforcing ribs 8 are provided, each extending from the outer surface of the first semicircular sleeve to the first long flange 3, and also, at a plurality of positions spaced apart in the longitudinal direction of the second semicircular sleeve 2, a plurality of second reinforcing ribs 9 are provided, each extending from the outer surface of the second semicircular sleeve to the second long flange 4, to enhance the connection strength between the epoxy sleeve and the long flange, reduce stress concentration at the connection of the long flange and the epoxy sleeve, and suppress rebound or deformation of the epoxy sleeve. Preferably, the first reinforcing bead 8 is welded between the first long flange and the outer surface of the first semi-circular sleeve, and the second reinforcing bead 9 is welded between the second long flange and the outer surface of the second semi-circular sleeve. The first and second ribs may also be secured between the outer surface of the first semi-circular sleeve and the first long flange, and between the outer surface of the second semi-circular sleeve and the second long flange in other ways.

The epoxy sleeve overcomes the defects in the prior art and achieves the following effects:

1. the positioning holes in the prior art are eliminated, and the first semicircular flange and the second semicircular flange are arranged, so that the gap between the epoxy sleeve and the outer wall of the pipeline is uniform, the epoxy filler poured into the gap between the epoxy sleeve and the outer wall of the pipeline is kept, the pipeline stress is shared more evenly, and the repairing effect is better. Meanwhile, the installation is convenient, and the tightness between the epoxy sleeve and the outer wall of the pipeline is ensured. More importantly, the strength of the epoxy sleeve is reduced due to the fact that the positioning holes are formed in the epoxy sleeve, and the local stress concentration and the hydrogen embrittlement sensitivity at the contact position of the positioning bolts and the outer wall of the pipeline are improved.

2. By arranging the groove on the surface of the round flange facing the outer wall of the pipeline and pouring sealant into the groove, good tightness is kept between the epoxy sleeve and the outer wall of the pipeline, and meanwhile, no air bubbles are introduced during pouring of the epoxy filler.

3. The reinforcing ribs are arranged between the long flange and the epoxy sleeve, so that the connection strength between the epoxy sleeve and the long flange is enhanced, the stress concentration at the connection part of the long flange and the epoxy sleeve is reduced, and the rebound or deformation of the epoxy sleeve is inhibited.

The above description is intended only to be illustrative of the utility model and not to be taken as limiting the utility model as fully set forth by those of ordinary skill in the art. The technical features disclosed above are not limited to the disclosed combination with other features, and other combinations between the technical features can be performed by those skilled in the art according to the purpose of the present utility model to achieve the purpose of the present utility model.

Claims

1. An epoxy sleeve for repairing a pipe, the epoxy sleeve comprising a first semicircular sleeve and a second semicircular sleeve, the first semicircular sleeve comprising a first elongate flange extending perpendicularly from each of two longitudinal edges of the first semicircular sleeve, the second semicircular sleeve comprising a second elongate flange extending perpendicularly from each of two longitudinal edges of the second semicircular sleeve, the epoxy sleeve being characterized in that the first semicircular sleeve further comprises a first semicircular flange located at each of two longitudinal edges of the first semicircular sleeve, the second semicircular sleeve further comprises a second semicircular flange located at each of two longitudinal edges of the second semicircular sleeve, the first semicircular flange and the second semicircular flange being sized such that when the first semicircular sleeve and the second semicircular sleeve are assembled around the pipe by the first elongate flange and the second elongate flange, the first semicircular flange and the second semicircular flange are respectively in engagement with an outer wall of the pipe, such that a gap is maintained between the epoxy sleeve and the outer wall of the pipe.

2. The epoxy sleeve of claim 1 wherein the inner wall of the first semicircular sleeve is further from the outer wall of the conduit than the inner wall of the first semicircular flange to ensure a gap between the first semicircular sleeve and the outer wall of the conduit and the inner wall of the second semicircular sleeve is further from the outer wall of the conduit than the inner wall of the second semicircular flange to ensure a gap between the second semicircular sleeve and the outer wall of the conduit.

3. The epoxy sleeve of claim 1 further comprising a plurality of first ribs spaced apart along the longitudinal direction of the first semicircular sleeve, each first rib extending from an outer surface of the first semicircular sleeve to the first elongate flange.

4. The epoxy sleeve of claim 1 further comprising a plurality of second ribs spaced apart along the longitudinal direction of the second semi-circular sleeve, each second rib extending from an outer surface of the second semi-circular sleeve to a second elongate flange.

5. The epoxy sleeve of claim 1 wherein the surface of the first semicircular flange facing the outer wall of the pipe has a first groove and a first gasket disposed within the first groove to seal the first semicircular flange and the outer wall of the pipe.

6. The epoxy sleeve of claim 5 wherein the first semicircular flange further comprises a sealing material disposed within the first groove to further seal the first semicircular flange and the outer wall of the pipe.

7. The epoxy sleeve of claim 1 wherein the surface of the second semicircular flange facing the outer wall of the pipe has a second groove and a second gasket disposed within the second groove to seal the second semicircular flange and the outer wall of the pipe.

8. The epoxy sleeve of claim 6 wherein the second semicircular flange further comprises a sealing material disposed within the second groove to further seal the second semicircular flange and the outer wall of the pipe.

9. The epoxy sleeve of claim 1 wherein the first semicircular flange and the first elongate flange are each welded to the first semicircular sleeve.

10. The epoxy sleeve of claim 1 wherein said second semicircular flange and second elongate flange are welded to said second semicircular sleeve, respectively.