GB2210134A - Method of repairing a pipe - Google Patents
Method of repairing a pipe Download PDFInfo
- Publication number
- GB2210134A GB2210134A GB8722174A GB8722174A GB2210134A GB 2210134 A GB2210134 A GB 2210134A GB 8722174 A GB8722174 A GB 8722174A GB 8722174 A GB8722174 A GB 8722174A GB 2210134 A GB2210134 A GB 2210134A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pipe
- shell
- seal
- seal means
- space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
- F16L55/175—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by using materials which fill a space around the pipe before hardening
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
A seal 14 is placed around the damaged part 12 and clamped between a shell 16 and the pipe 10. Epoxy resin seals 20, 22 are formed. Material is injected at 28 to fill the space 26 between the shell and pipe and outside the seal 14. In a second stage of injection resin material is injected at 34 to fill the space 24 within the seal 14. lf gas is escaping through the damaged part 12 and through the valve 38 the pressure applied to the resin exceeds the gas pressure and is maintained during curing. Instead of a single continuous seal 14, two seals each encircling the pipe can be used. The shell is two parts joined by welding; or two parts drawn together by bolts to compress the seal or seals. <IMAGE>
Description
METHOD OF REPAIRING A PIPE
The invention relates to methods of repairing pipes.
In a known method of repairing a pipe, such as a pipeline, an encircling steel shell in two parts is welded to the pipe but there are disadvantages in welding the shell to the pipe while it is conveying gas under pressure. In another known repair method the shell is placed around the damaged part of the pipe leaving a gap of say 16 millimetres to accommodate ovality in the shell and pipe. The gap is filled with epoxy resin material which when cured either adheres or at least closely conforms to both the shell and the pipe and supports the damaged part.
The resin material provides quite an efficient load transfer path from the pipe to the shell.
In cases in which the damage is such that gas is leaking from the pipe while it is being repaired pressure is applied to the epoxy resin material and maintained until the material has set. The applied pressure is at or about the pressure of the gas in the pipe and substantial forces are needed to prevent the epoxy resin material from extruding out of the gaps between the ends of the shell and the pipe. Such forces are provided by a structure which is inconvenient to use and which may give rise to considerable difficulties.
The object of the invention is to provide a method of repairing a pipe by which injection of epoxy resin or other settable material into the space between the pipe and the shell is effected in two stages.
The method is applicable to the repair of pipes which are not leaking or which are leaking.
According to the invention, a method of repairing a pipe comprises effecting the method in two stages in the first of which first seal means bounding a first space between the pipe and an encircling shell and adjacent the damaged part of the pipe wall is enclosed by settable material injected into remaining space between the pipe and the shell bounded by the first seal means and by second seal means and in the second stage settable material is injected into the first space.
In one form, the method comprises using as the first seal means a seal which extends continuously around the damaged part of the pipe wall.
In that case it is preferred to move the shell towards the pipe to compress the first seal means and to fix the position of the shell in relation to the pipe before the first stage is effected.
In another form, the method comprises using as the first seal means two seals each extending continuously around the pipe with the damaged part of the pipe wall between them.
The shell used in the method can be in two parts which are moved together to compress the first seal means and the positions of which are fixed in relation to the pipe before the first stage is effected.
One form of method will now be described by way of example with reference to the accompanying drawing, which is a diagrammatic side elevation partly in longitudinal section showing part of a pipe which has been damaged and a shell fixed in position relatively to the pipe. The various parts are shown ready for the commencement of the first stage of injection of settable material.
The drawing shows a steel pipe 10, which for example is part of a natural gas transmission pipeline conveying gas at a pressure of 6.89 Newtonsj square millimetre (70 bar). The pipe 10 has sustained damage to part 12 of the pipe wall. A first seal means in the form of a continuous seal 14 of the O-ring kind, for example, extends continuously around the damaged part 12. The seal is made of deformable elastomeric material, for example, and is shown compressed between the pipe 10 and a cylindrical steel shell 16, which completely encircles the pipe 10.
The steps of the method which have already been effected to reach the position shown in the drawing are as follows: two parts, for example halves, of the shell 16 are assembled around the pipe 10 and joined together for example by welding to form the complete shell 16 shown.
Alternatively, the parts can be connected together by bolts extending through flanges on the parts. The seal 14 is positioned around the damaged part 12. The seal is bonded to the pipe, if preferred, for example if the seal is at the lower side of the pipe. The shell 16 is moved along the pipe 10 so as to enclose the seal 14. As a further alternative the parts of the shell can be assembled around the damaged part and the seal before being bolted together.
The shell 16 has screws 18 which are adjusted to move the shell 16 towards the pipe so as to clamp the seal 14 between the shell and the pipe 10. The screws 18 also fix the position of the shell in relation to the pipe 10. If the shell is parts bolted together the seal 14 can be clamped by the movement of the shell parts towards each other, or screws 18 can be used as before.
In any case the shell must be fixed by screws similar to the screws 18, or by other means, in relation to the pipe 10.
Next, a quick-setting epoxy resin material is applied to the gaps between the ends of the shell 16 and the pipe 10 to form second and third seals 20, 22. The outside of each seal 20, 22 is smoothly contoured as shown to enable an external corrosion-protection material (not shown) to be wrapped around the repaired pipe. Once the seals 20, 22 have set the assembly is as shown in the drawing and is ready for the injection of epoxy resin material in two stages.
The seal 14 bounds a first space 24 within the seal between the shell 16 and the pipe 10. The remaining space 26 between the shell 16 and the pipe 10 outside the seal 14 is bounded by that seal and the second and third seals 20, 22. Epoxy resin material is injected through a tube 28 into that remaining space 26 in the first stage. The tube 28 communicates with a port through the wall of the shell 16. The filling of the space 26 is monitored by observation of bubbles of air issuing through screwed holes which extend through the wall of the shell 16. As filling proceeds, when the resin material issuing through the holes is free of air bubbles, the holes are closed by screws 30. When the space 26 is full resin material issues from an over-flow pipe 32.
Injection is now stopped when the resin material issuing is free of air bubbles and the resin material in the space 26 is allowed to cure.
When the resin material has cured, a screw-plug 34 is removed from its screwed hole in the shell 16 and a filler tube (not shown) is connected to the. shell 16 at the same hole. The pipe 32 is removed.
The shell 16 has a small orifice 36 at its highest level which communicates with a valve 38 and a pipe 40. If gas is escaping from the pipe 10 through the damaged part 12 it passes through the orifice 36, the valve 38 and the pipe 40 to a safe zone where it can be vented to atmosphere. The second stage of injection can now be effected.
Epoxy resin material is injected into the first space 24 through the filler tube (not shown) and through the hole vacated by the plug 34.
When material issuing from a bleed hole (not shown) beyond the outlet of the valve 38 is free from air bubbles, the valve is closed. More material is injected until the pressure applied by the injecting pump is greater than the pressure of the gas in the pipe 10. The applied pressure is maintained until the resin material has cured and set.
When the material in the first space 24 has set, all projections on the cylindnical surface of the shell 16 are removed leaving a smooth outer surface ready to receive the external corrosion-protection wrapping.
If gas was not escaping, the valve 38 its stub pipe and the pipe 40 would be unnecessary. There would be no need to apply high pressure to the resin material nor maintain the pressure during curving.
The resin material which is used preferably includes a filler, such as fine sand which for example comprises 75% of the mixture by weight.
In cases where the damaged part 12 extends angularly around the pipe 10 to the extent of some 1800 or more it will be necessary to use a shell in two parts which can be moved towards each other by bolts or otherwise to clamp the seal. Where the damaged part 12 extends angularly around the pipe to the extent of 3600, or nearly to that extent, it may be preferred to use a different form of first seal means. In such cases the first seal means comprise two seals, each extending continuously around the pipe 10 with the damaged part between them. Each seal can be formed by a length of material placed around the pipe with its ends united by a scarf joint.In that case, the remaining space outside the space enclosed by the first seal means is in two parts and each is filled with resin material through its own injection hole, at the lowermost side of the pipe in a manner similar to that described above. Each part would have an exit hole.
It is possible to use material other than epoxy resin material to fill the spaces. For example, a cement mixture can be used, and may be preferred where the method is used for underwater repair. In that case, the cement is mixed using seawater on board a support vessel at the sea surface and pumped down to the pipe.
For underwater applications, and for land applications if preferred, the end seals 2, 22 are made of lengths of elastomeric material, such as rubber or synthetic plastic material instead of settable material. The lengths are for example, placed around the pipe and their ends jointed by scarf joints using adhesive before the shell is assembled around them.
In a modification of the method, the valve 38 and the pipe 40 are used to pressurise the resin or other material in the space 24 up to the internal pipe pressure. Ths has the advantage that the strss on the damaged part 12 is significantly reduced.
Claims (10)
1. A method of repairing a pipe comprising effecting the method in two
stages in the first of which first seal means bounding a first space
between the pipe and an encircling shell and adjacent the damaged
part of the pipe wall is enclosed by settable material injected into
remaining space between the pipe and the shell bounded by the first
seal means and in the second stage settable material is injected
into the first space.
2. A method according to claim 1, comprising using as the first seal
means a seal which, extends continuously around the damaged part of
the pipe wall.
3. A method according to claim 2 comprising moving the shell towards
the pipe to clamp the first seal means and fixing the position of
the shell in relation to the pipe before the first stage is
effected.
4. A method according to claim 1, comprising using the first seal means
two seals each extending continuously around the pipe with the
damaged part of the pipe wall between them.
5. A method according to claim 1, 2 or 4, comprising using a shell in
two parts and moving the parts together to clamp the first seal
means and fixing the positions of the shell parts in relation to the
pipe before the first stage is effected.
6. A method according to any preceding claim comprising forming the
second seal means using a settable material comprising epoxy
resin.
7. A method according to any preceding claim comprising using as the
settable material injected into the first and remaining spaces a
material comprising epoxy resin.
8. A method according to any preceding claim comprising applying
pressure to the settable material injected into the first space to
counteract the pressure of gas in the pipe and maintaining the
applied pressure until the material has set.
9. A method according to claim 1, substantially as herein described
with reference to the accompanying drawing.
10. A pipe repaired by the method claimed in any preceding claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8722174A GB2210134B (en) | 1987-09-21 | 1987-09-21 | Method of repairing a pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8722174A GB2210134B (en) | 1987-09-21 | 1987-09-21 | Method of repairing a pipe |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8722174D0 GB8722174D0 (en) | 1987-10-28 |
| GB2210134A true GB2210134A (en) | 1989-06-01 |
| GB2210134B GB2210134B (en) | 1990-11-14 |
Family
ID=10624130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8722174A Expired - Fee Related GB2210134B (en) | 1987-09-21 | 1987-09-21 | Method of repairing a pipe |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2210134B (en) |
Cited By (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2295874A (en) * | 1994-12-10 | 1996-06-12 | Progenitive Serv Ltd | Pipeline isolation apparatus and method |
| WO1996019694A1 (en) * | 1993-07-01 | 1996-06-27 | Jens Vatne | Arrangement for use by fitting pipes into each other, and a method for mounting/use of the arrangement |
| GB2344147A (en) * | 1998-11-26 | 2000-05-31 | Vosper Thornycroft Ltd | Encasing tubular component |
| GB2352489A (en) * | 1999-07-24 | 2001-01-31 | Bg Intellectual Pty Ltd | Tee Connection to a pipeline |
| GB2362446A (en) * | 2000-04-28 | 2001-11-21 | Lattice Intellectual Property | Securing shell assemblies to pipelines |
| WO2006055102A1 (en) * | 2004-09-29 | 2006-05-26 | Dresser, Inc. | Pipeline repair system and method of installation |
| WO2009118556A1 (en) * | 2008-03-25 | 2009-10-01 | Flexlife Limited | Method and apparatus for repairing tubular members |
| RU2449204C2 (en) * | 2010-01-11 | 2012-04-27 | Общество С Ограниченной Ответственностью "Нпип Киатон" | COUPLING REPAIR METHOD OF PIPELINE (TECHNOLOGY BY KiATON COMPANY) (VERSIONS) |
| RU2451233C2 (en) * | 2008-07-07 | 2012-05-20 | Дочерняя Компания "Укртрансгаз" Национальной Акционерной Компании "Нефтегаз Украины" | Repair method of pipeline in operation (versions) |
| RU2474752C1 (en) * | 2012-01-20 | 2013-02-10 | Открытое акционерное общество "Газпром" | Method for prevention of defect growth in pipeline walls |
| RU2484359C1 (en) * | 2011-11-01 | 2013-06-10 | Общество с ограниченной ответственностью "ВолгаУралСпецстрой" | Method of pipeline repair and device to this end |
| WO2013086192A1 (en) * | 2011-12-06 | 2013-06-13 | Berry Metal Company | Method to repair compromised inlet outlet piping |
| GB2505528A (en) * | 2012-08-30 | 2014-03-05 | David Beech | Enclosure for pipes, cables and wires |
| RU2516052C1 (en) * | 2012-10-23 | 2014-05-20 | Открытое акционерное общество "Урало-Сибирские магистральные нефтепроводы имени Д.А. Черняева" (ОАО "Уралсибнефтепровод") | Well repair method |
| RU2520778C1 (en) * | 2012-12-21 | 2014-06-27 | Открытое акционерное общество "Транссибирские магистральные нефтепроводы" (ОАО "Транссибнефть") | Method of pipeline repair by composite coupling installation |
| DE202015103610U1 (en) | 2014-07-14 | 2015-07-27 | Larisa Vladimirovna Lantsova | Versatile cone sleeve |
| CN105864565A (en) * | 2016-06-24 | 2016-08-17 | 合肥欧克斯新型建材有限公司 | Device for treating industrial pipeline leak points |
| CN105953021A (en) * | 2016-07-03 | 2016-09-21 | 安徽碧源环保工程有限公司 | Under-pressure processing method for leakage point of industrial pipeline |
| CN105953022A (en) * | 2016-06-30 | 2016-09-21 | 合肥天沃能源科技有限公司 | Device for treating leakage point of industrial pipeline |
| CN105953020A (en) * | 2016-06-30 | 2016-09-21 | 合肥天沃能源科技有限公司 | Method for treating leakage point of industrial pipeline under pressure |
| CN105972374A (en) * | 2016-06-24 | 2016-09-28 | 合肥欧克斯新型建材有限公司 | Flange short tube with valve |
| CN105972376A (en) * | 2016-06-30 | 2016-09-28 | 合肥天沃能源科技有限公司 | Flange short tube with valve |
| CN105972377A (en) * | 2016-07-03 | 2016-09-28 | 安徽碧源环保工程有限公司 | Flange short pipe provided with valve |
| DE202017107920U1 (en) | 2017-12-27 | 2018-01-17 | Roman Radifovich Muginov | Conical composite sleeve |
| CN107725965A (en) * | 2017-09-14 | 2018-02-23 | 中石化川气东送天然气管道有限公司 | A kind of method from leakage point between internal closure gas trunklines pipeline branch mouth and branch pipeline root valve |
| RU2704346C1 (en) * | 2019-04-11 | 2019-10-28 | Общество с ограниченной ответственностью "Научно-исследовательский институт природных газов и газовых технологий - Газпром ВНИИГАЗ" | Pipeline repair coupling |
| RU2704524C1 (en) * | 2019-04-11 | 2019-10-29 | Общество с ограниченной ответственностью "Научно-исследовательский институт природных газов и газовых технологий - Газпром ВНИИГАЗ" | Pipeline coupling |
| CN110762332A (en) * | 2019-09-26 | 2020-02-07 | 中国石油天然气集团有限公司 | Device and process for repairing pipeline girth weld defects by using epoxy steel sleeve |
| US10563807B2 (en) | 2017-01-20 | 2020-02-18 | Valeriy Ivanovich Vinokurov | Composite conical sleeve |
| US11767943B2 (en) | 2020-12-10 | 2023-09-26 | Xcel Energy | Vent box method and appartus |
-
1987
- 1987-09-21 GB GB8722174A patent/GB2210134B/en not_active Expired - Fee Related
Cited By (37)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996019694A1 (en) * | 1993-07-01 | 1996-06-27 | Jens Vatne | Arrangement for use by fitting pipes into each other, and a method for mounting/use of the arrangement |
| GB2295874A (en) * | 1994-12-10 | 1996-06-12 | Progenitive Serv Ltd | Pipeline isolation apparatus and method |
| GB2344147A (en) * | 1998-11-26 | 2000-05-31 | Vosper Thornycroft Ltd | Encasing tubular component |
| GB2352489A (en) * | 1999-07-24 | 2001-01-31 | Bg Intellectual Pty Ltd | Tee Connection to a pipeline |
| GB2352489B (en) * | 1999-07-24 | 2003-04-23 | Bg Intellectual Pty Ltd | Tee Connection to a pipeline |
| GB2362446A (en) * | 2000-04-28 | 2001-11-21 | Lattice Intellectual Property | Securing shell assemblies to pipelines |
| GB2362446B (en) * | 2000-04-28 | 2004-09-15 | Lattice Intellectual Property | Securing shell assemblies to pipelines |
| WO2006055102A1 (en) * | 2004-09-29 | 2006-05-26 | Dresser, Inc. | Pipeline repair system and method of installation |
| US7165579B2 (en) | 2004-09-29 | 2007-01-23 | Dresser, Inc. | Pipeline repair system and method of installation |
| AU2009229198B2 (en) * | 2008-03-25 | 2014-01-09 | Flexlife Limited | Method and apparatus for repairing tubular members |
| WO2009118556A1 (en) * | 2008-03-25 | 2009-10-01 | Flexlife Limited | Method and apparatus for repairing tubular members |
| US9016727B2 (en) | 2008-03-25 | 2015-04-28 | Flexlife Limited | Apparatus for repairing tubular members |
| RU2451233C2 (en) * | 2008-07-07 | 2012-05-20 | Дочерняя Компания "Укртрансгаз" Национальной Акционерной Компании "Нефтегаз Украины" | Repair method of pipeline in operation (versions) |
| RU2449204C2 (en) * | 2010-01-11 | 2012-04-27 | Общество С Ограниченной Ответственностью "Нпип Киатон" | COUPLING REPAIR METHOD OF PIPELINE (TECHNOLOGY BY KiATON COMPANY) (VERSIONS) |
| RU2484359C1 (en) * | 2011-11-01 | 2013-06-10 | Общество с ограниченной ответственностью "ВолгаУралСпецстрой" | Method of pipeline repair and device to this end |
| WO2013086192A1 (en) * | 2011-12-06 | 2013-06-13 | Berry Metal Company | Method to repair compromised inlet outlet piping |
| CN103998847A (en) * | 2011-12-06 | 2014-08-20 | 贝里金属公司 | Method to repair compromised inlet outlet piping |
| RU2474752C1 (en) * | 2012-01-20 | 2013-02-10 | Открытое акционерное общество "Газпром" | Method for prevention of defect growth in pipeline walls |
| GB2505528B (en) * | 2012-08-30 | 2015-05-20 | David Beech | Enclosure means for pipes, cables and wires |
| GB2505528A (en) * | 2012-08-30 | 2014-03-05 | David Beech | Enclosure for pipes, cables and wires |
| RU2516052C1 (en) * | 2012-10-23 | 2014-05-20 | Открытое акционерное общество "Урало-Сибирские магистральные нефтепроводы имени Д.А. Черняева" (ОАО "Уралсибнефтепровод") | Well repair method |
| RU2520778C1 (en) * | 2012-12-21 | 2014-06-27 | Открытое акционерное общество "Транссибирские магистральные нефтепроводы" (ОАО "Транссибнефть") | Method of pipeline repair by composite coupling installation |
| DE202015103610U1 (en) | 2014-07-14 | 2015-07-27 | Larisa Vladimirovna Lantsova | Versatile cone sleeve |
| CN105972374A (en) * | 2016-06-24 | 2016-09-28 | 合肥欧克斯新型建材有限公司 | Flange short tube with valve |
| CN105864565A (en) * | 2016-06-24 | 2016-08-17 | 合肥欧克斯新型建材有限公司 | Device for treating industrial pipeline leak points |
| CN105972376A (en) * | 2016-06-30 | 2016-09-28 | 合肥天沃能源科技有限公司 | Flange short tube with valve |
| CN105953020A (en) * | 2016-06-30 | 2016-09-21 | 合肥天沃能源科技有限公司 | Method for treating leakage point of industrial pipeline under pressure |
| CN105953022A (en) * | 2016-06-30 | 2016-09-21 | 合肥天沃能源科技有限公司 | Device for treating leakage point of industrial pipeline |
| CN105953021A (en) * | 2016-07-03 | 2016-09-21 | 安徽碧源环保工程有限公司 | Under-pressure processing method for leakage point of industrial pipeline |
| CN105972377A (en) * | 2016-07-03 | 2016-09-28 | 安徽碧源环保工程有限公司 | Flange short pipe provided with valve |
| US10563807B2 (en) | 2017-01-20 | 2020-02-18 | Valeriy Ivanovich Vinokurov | Composite conical sleeve |
| CN107725965A (en) * | 2017-09-14 | 2018-02-23 | 中石化川气东送天然气管道有限公司 | A kind of method from leakage point between internal closure gas trunklines pipeline branch mouth and branch pipeline root valve |
| DE202017107920U1 (en) | 2017-12-27 | 2018-01-17 | Roman Radifovich Muginov | Conical composite sleeve |
| RU2704346C1 (en) * | 2019-04-11 | 2019-10-28 | Общество с ограниченной ответственностью "Научно-исследовательский институт природных газов и газовых технологий - Газпром ВНИИГАЗ" | Pipeline repair coupling |
| RU2704524C1 (en) * | 2019-04-11 | 2019-10-29 | Общество с ограниченной ответственностью "Научно-исследовательский институт природных газов и газовых технологий - Газпром ВНИИГАЗ" | Pipeline coupling |
| CN110762332A (en) * | 2019-09-26 | 2020-02-07 | 中国石油天然气集团有限公司 | Device and process for repairing pipeline girth weld defects by using epoxy steel sleeve |
| US11767943B2 (en) | 2020-12-10 | 2023-09-26 | Xcel Energy | Vent box method and appartus |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2210134B (en) | 1990-11-14 |
| GB8722174D0 (en) | 1987-10-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
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