CN110315668B - Novel steel epoxy sleeve repairing method - Google Patents
Novel steel epoxy sleeve repairing method Download PDFInfo
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- CN110315668B CN110315668B CN201910477579.3A CN201910477579A CN110315668B CN 110315668 B CN110315668 B CN 110315668B CN 201910477579 A CN201910477579 A CN 201910477579A CN 110315668 B CN110315668 B CN 110315668B
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- Prior art keywords
- sleeve
- epoxy
- epoxy resin
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- steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
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- Pipe Accessories (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Abstract
The invention discloses a novel steel epoxy sleeve repairing method, which comprises the steps of firstly filling epoxy resin into a thin-wall steel pipe to form epoxy particle pipes, then arranging the epoxy particle pipes in sleeves with chamfers at two ends according to the most dense arrangement, then placing the sleeves on a vibration table to shatter the epoxy resin, and finally controlling the temperature around a pipe body to enable the sleeves to form interference fit with the pipe body, thereby fixing the sleeves on the pipe body. The invention has the advantages that: (1) the epoxy resin in the sleeve exists in a particle form and is filled in a thin-wall steel pipe, and the epoxy resin does not exist in a large plate-shaped structure any more, so brittle cracking cannot occur, the possibility that the steel epoxy sleeve is damaged due to the brittle cracking of the epoxy resin is avoided, and the bending resistance and the impact resistance of the large-diameter pipeline are obviously improved; (2) the sleeve is installed on the body through interference fit, need not reuse epoxy to seal telescopic both ends, convenient operation realizes labour saving and time saving easily.
Description
Technical Field
The invention relates to a method for repairing a large-diameter pipeline, in particular to a novel method for repairing a steel epoxy sleeve capable of enabling the large-diameter pipeline to have good bending resistance and shock resistance, and belongs to the technical field of pipeline repair.
Background
The existing high-steel-grade large-pipe-diameter conveying pipeline has a trend of continuously improving the defect repairing requirements, and the defects of the traditional pipeline defect repairing technology are obvious.
Tube body defects mainly fall into four categories: metal loss, cracks, distortion, weld defects. In general, in the running process of the pipeline, the existence of the girth weld defects has the greatest harm to the running of the pipeline, so that research on the repairing method and the repairing process of the girth weld defects is very necessary.
At present, the common domestic defect repair methods comprise: repair welding, plate repair, repair of an A-type sleeve, repair of a B-type sleeve, repair of a steel epoxy sleeve, repair of a composite material, addition of a mechanical clamp, addition of a lining, pipe replacement and the like. For the circumferential weld defects, the most adopted repair method is as follows: b-type sleeve repair and steel epoxy sleeve repair.
1. B-type sleeve repair
The B-type sleeve is used for repairing the circumferential weld defects, and the following defects mainly exist:
(1) in the welding process, oil and gas are required to stop conveying;
(2) in the welding process, due to the existence of welding heat, danger is easy to occur to flammable and explosive oil and gas pipelines;
(3) during the welding process, the requirements on temperature and humidity are strict, otherwise hydrogen embrittlement is easy to occur.
2. Steel epoxy sleeve repair
The repair of the steel epoxy sleeve to the girth weld defect is greatly improved compared with the repair of a B-type sleeve, for example: the steel epoxy sleeve is sealed with the pipe body through epoxy resin, and the solidified epoxy resin is high in brittleness, so that when the pipeline is greatly deformed or is severely impacted, the epoxy resin is likely to crack in a brittle manner, the steel epoxy sleeve is likely to be damaged, and the overall performance (including bending resistance and impact resistance) of the pipeline is greatly influenced.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a novel steel epoxy sleeve repairing method which can enable a large-diameter pipe to have better bending resistance and impact resistance.
In order to achieve the above object, the present invention adopts the following technical solutions:
the novel method for repairing the steel epoxy sleeve is characterized by comprising the following steps of:
step 1: pouring epoxy resin into the thin-wall steel pipe, standing to solidify the epoxy resin to form an epoxy particle pipe;
step 2: chamfering is made at two ends of a common sleeve to form a sleeve with chamfers;
step 3: arranging the epoxy particle tubes in the sleeve in a closest arrangement, welding the inner epoxy particle tube with the sleeve, and welding the outer epoxy particle tube with the inner epoxy particle tube;
step 4: vertically placing the sleeve welded with the epoxy particle tubes, pouring epoxy resin into the sleeve to fill the gaps between the epoxy particle tubes and the sleeve and the gaps between the epoxy particle tubes and the epoxy particle tubes with the epoxy resin, and standing to solidify the epoxy resin;
step 5: placing the sleeve into which the epoxy resin is poured on a vibration table for vibration, and vibrating and crushing the epoxy resin;
step 6: reducing the temperature around the tube body to cause the tube body to shrink, and sleeving the sleeve on the tube body at a preset assembly temperature to enable the sleeve to be attached to the tube body;
step 7: and the temperature around the pipe body is recovered, the sleeve and the pipe body form interference fit, and the sleeve is fixed on the pipe body.
The novel method for repairing the steel epoxy sleeve is characterized in that in Step1, the pipe diameter of the thin-wall steel pipe is 50-60 mm.
The new method for repairing the steel epoxy sleeve is characterized in that in Step2, the gradient ratio of the chamfer is 1: 2.
The novel method for repairing the steel epoxy sleeve is characterized in that in Step2, the wall thickness of the chamfered sleeve is 3/4-1 times of that of the pipe body.
The new method for repairing the steel epoxy sleeve is characterized in that in Step5, the vibration force of a vibration table is adjusted to ensure that the granularity of the epoxy resin is 5-7 mm.
The new method for repairing steel epoxy sleeve is characterized in that in Step6, the assembly temperature is less than 10 ℃.
The invention has the advantages that:
(1) epoxy resin in the sleeve exists in a particle form and is filled in a thin-wall steel pipe to form an epoxy particle pipe, the epoxy resin does not exist in a large plate-shaped structure any more, so brittle cracking does not occur, the possibility that the steel epoxy sleeve is damaged due to the brittle cracking of the epoxy resin is avoided, and the bending resistance and the shock resistance of the large-diameter pipeline are obviously improved;
(2) the sleeve is installed on the body through interference fit, need not reuse epoxy to seal telescopic both ends, convenient operation realizes labour saving and time saving easily.
Drawings
FIG. 1 is a schematic external view of a repaired pipe;
figure 2 is a schematic cross-sectional view of a repaired pipe (only a portion of the epoxy pellets are shown).
The meaning of the reference symbols in the figures: 1-pipe body, 2-sleeve, 3-epoxy granular pipe, 4-circumferential weld and 5-flange.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
Referring to fig. 1 and 2, the new method for repairing the steel epoxy sleeve provided by the invention comprises the following steps:
step 1: manufacture of epoxy particle tube
And (3) pouring the epoxy resin into the thin-wall steel pipe, standing for 24 hours to solidify the epoxy resin and form the epoxy particle pipe 3.
The length of the thin-wall steel pipe is slightly shorter than that of the sleeve 2, and the pipe diameter is 50-60 mm.
Step 2: manufacturing sleeve with chamfer
Chamfers are manufactured at two ends of the common sleeve, the gradient ratio of the chamfers is 1:2, and the sleeve 2 with the chamfers is formed.
The wall thickness of the sleeve 2 is determined according to the wall thickness of the tubular body 1 to be repaired, and is typically 3/4-1 times the wall thickness of the tubular body 1.
Step 3: fixed epoxy particle tube
The epoxy particle tubes 3 are arranged in the sleeve 2 in the most dense arrangement, the inner layer of the epoxy particle tubes 3 is welded with the sleeve 2, and the outer layer of the epoxy particle tubes 3 is welded with the inner layer of the epoxy particle tubes 3.
Step 4: casting epoxy resin
Vertically placing the sleeve 2 welded with the epoxy particle tubes 3 on a horizontal plane, pouring epoxy resin into the sleeve 2 to fill the gaps between the epoxy particle tubes 3 and the sleeve 2 and the gaps between the epoxy particle tubes 3 and the epoxy particle tubes 3 with the epoxy resin, and standing for 24h to solidify the epoxy resin.
Step 5: shattering epoxy resin
The sleeve 2 poured with the epoxy resin is placed on a vibration table, the epoxy resin in the epoxy particle tube 3, the epoxy resin filled between the epoxy particle tube 3 and the sleeve 2 and the epoxy resin filled between the epoxy particle tube 3 and the epoxy particle tube 3 are vibrated to be broken, and the vibration force of the vibration table is adjusted to enable the granularity of the epoxy resin to be 5-7 mm.
The epoxy resin has smaller granularity, and can avoid the formation of gaps among particles, thereby being beneficial to improving the bending resistance and the impact resistance of the pipeline.
Step 6: assembly sleeve
The method comprises the steps of cleaning and polishing a surface anticorrosive layer of a pipe body 1 to be repaired, reducing the temperature around the pipe body 1 to cause the pipe body 1 to shrink, sleeving a sleeve 2 on the pipe body 1 at a preset assembly temperature (less than 10 ℃) to cause the sleeve 2 to be attached to the pipe body 1.
Step 7: fixing sleeve
The temperature around the pipe body 1 is recovered, the pipe body 1 is thermally expanded before, the sleeve 2 and the pipe body 1 form interference fit, and the sleeve 2 is fixed on the pipe body 1.
Because epoxy's line coefficient of contraction and expansion is less than or equal to 0.05%, the holistic contraction and expansion of sleeve 2 can be ignored, and the contraction and expansion rate of body 1 is far greater than the contraction and expansion rate of sleeve 2, so can fix sleeve 2 on body 1 through interference fit, need not reuse epoxy to carry out the sealed at sleeve both ends, convenient operation, easy realization, labour saving and time saving.
In addition, because the epoxy resin in the sleeve 2 exists in the form of particles and is filled in a thin-wall steel pipe to form the epoxy particle pipe 3, the epoxy resin does not exist in a large plate-shaped structure any more, so brittle fracture does not occur, the possibility that the steel epoxy sleeve is damaged due to the brittle fracture of the epoxy resin is avoided, and the bending resistance and the shock resistance of the large-diameter pipeline are obviously improved.
It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the protection scope of the present invention.
Claims (6)
1. The novel method for repairing the steel epoxy sleeve is characterized by comprising the following steps of:
step 1: pouring epoxy resin into the thin-wall steel pipe, standing to solidify the epoxy resin to form an epoxy particle pipe;
step 2: chamfering is made at two ends of a common sleeve to form a sleeve with chamfers;
step 3: arranging the epoxy particle tubes in the sleeve in a closest arrangement, welding the inner epoxy particle tube with the sleeve, and welding the outer epoxy particle tube with the inner epoxy particle tube;
step 4: vertically placing the sleeve welded with the epoxy particle tubes, pouring epoxy resin into the sleeve to fill the gaps between the epoxy particle tubes and the sleeve and the gaps between the epoxy particle tubes and the epoxy particle tubes with the epoxy resin, and standing to solidify the epoxy resin;
step 5: placing the sleeve into which the epoxy resin is poured on a vibration table for vibration, and vibrating and crushing the epoxy resin;
step 6: reducing the temperature around the tube body to cause the tube body to shrink, and sleeving the sleeve on the tube body at a preset assembly temperature to enable the sleeve to be attached to the tube body;
step 7: and the temperature around the pipe body is recovered, the sleeve and the pipe body form interference fit, and the sleeve is fixed on the pipe body.
2. The new steel epoxy sleeve repair method of claim 1, wherein in Step1, the diameter of said thin-walled steel tube is 50-60 mm.
3. The new steel epoxy sleeve repair method of claim 1, wherein in Step2, the slope ratio of the chamfer is 1: 2.
4. The new steel epoxy sleeve repair method of claim 1, wherein in Step2, the chamfered sleeve has a wall thickness 3/4-1 times the wall thickness of the tubular body.
5. The new steel epoxy sleeve repair method of claim 1, wherein the vibration force of the vibration table is adjusted to make the epoxy resin particle size 5-7mm at Step 5.
6. The new steel epoxy sleeve repair method of claim 1 wherein in Step6, the assembly temperature is < 10 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910477579.3A CN110315668B (en) | 2019-06-03 | 2019-06-03 | Novel steel epoxy sleeve repairing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910477579.3A CN110315668B (en) | 2019-06-03 | 2019-06-03 | Novel steel epoxy sleeve repairing method |
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| CN110315668A CN110315668A (en) | 2019-10-11 |
| CN110315668B true CN110315668B (en) | 2021-04-20 |
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| CN201910477579.3A Active CN110315668B (en) | 2019-06-03 | 2019-06-03 | Novel steel epoxy sleeve repairing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112361115A (en) * | 2020-09-29 | 2021-02-12 | 中国石油天然气集团有限公司 | Special-shaped sleeve for repairing fillet weld defect of B-shaped sleeve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5417910A (en) * | 1991-10-31 | 1995-05-23 | Levesque; Michael D. | Method for securing flared or compression tube fittings |
| US5722463A (en) * | 1996-11-25 | 1998-03-03 | Petro-Line Upgrading Services Ltd. | External pipe reinforcing sleeve |
| GB2393229B (en) * | 2002-09-17 | 2004-11-24 | Petronas Res & Scient Services | Method and means of repairing a pipe |
| CN200949730Y (en) * | 2006-02-15 | 2007-09-19 | 北京华油天然气有限责任公司 | Clamp for restoring pipeline with epoxide resin injection method |
| CN109000083A (en) * | 2017-06-07 | 2018-12-14 | 中国石油天然气股份有限公司 | Method for repairing pipeline by using epoxy sleeve |
| CN109058658A (en) * | 2018-09-27 | 2018-12-21 | 江苏清源管道技术有限公司 | A kind of three layers of PE anticorrosion structure of joint coating on pipeline and construction technology |
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