CA2230538A1 - Pipe rehabilitation - Google Patents
Pipe rehabilitation Download PDFInfo
- Publication number
- CA2230538A1 CA2230538A1 CA002230538A CA2230538A CA2230538A1 CA 2230538 A1 CA2230538 A1 CA 2230538A1 CA 002230538 A CA002230538 A CA 002230538A CA 2230538 A CA2230538 A CA 2230538A CA 2230538 A1 CA2230538 A1 CA 2230538A1
- Authority
- CA
- Canada
- Prior art keywords
- liner
- pipeline
- bladder
- resin
- rehabilitated
- 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.)
- Abandoned
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
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
- F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
- F16L55/1652—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section the flexible liner being pulled into the damaged section
- F16L55/1654—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section the flexible liner being pulled into the damaged section and being inflated
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
A method for rehabiliting existing pipelines in-situ is disclosed. A tubular liner (5) of a generally absorbent material is formed and at least one expandable bladder (7) is fed into the liner (5). The liner (5) is impregnated with a cold curable resin. The external surface of the liner and/or the internal surface of the pipeline (8) to be rehabilited is coated with a water resistant adhesive coating (16) prior to being fed into the pipeline (8) to be rehabilited together with its associated bladder (7). The bladder (7) is then inflated with a gaseous fluid to force the liner (5) against the internal wall (19) of said pipeline; and the inflation is maintained until the resin impregnated liner (5) has cured. The bladder (7) may then be removed from the cured liner (5).
Description
CA 02230~38 1998-02-26 W O 97/08487 PCT/AU9G~ 8 PIPE REHABILITATION
TECHNICAL FIELD
The present invention relates to rehabilit~ting Pxietinp pipelines of various lengths s and diameters and, in particular, to a method for performing such rehabilitation.
BACKGROUND ART
Und&~ ou"d pipe systems deteriorate over time as a result of degradation of m~t~ri~le and outside influences such as tree roots, co",~l~;s:iion from above, expansion and contraction and numerous other factors. In order to avoid the expense of excavating 0 the pipes and replacing them a nurnber of "in situ" rehabilitation techniques have been developed. Most of these systems involve lining int~rn~lly the old pipe using a plastic liner which is fed into the old pipe via exieting manholes or other ~xieting access points.
The liner is normally exrzn~1ecl into the required position against the int~rn~l wall ofthe t-xieting pipe and cured to provide a rehabilitated pipe.
Known techniques typically use polyvinylchloride (PVC) liners which are hot-cured. The liner is fed into the çxietinf~ pipe in a heated and softened form and then is further heated and P!xr~n~1çcl using ~ ul;sed steam to force the liner against the intf rn~l wall of the ~xieting pipe. The steam is then replaced by ~.le;,~;lll ;ee-l air and the liner allowed to cool and cure while still being held firmly against the intern~l pipe wall.
Such systems have a number of disadvantages. They require expensive, speci~liee~l plant and eqllipment For example, special semi-trailers, capable of carrying large in~llletri~l generators and c-,llll,l.,;,~ors. The capital equipment may cost in the order of hundreds of thousands of dollars and is required by each crew to rehabilitate CA 02230~38 1998-02-26 each pipeline. Each pipeline may take of the order of 6-12 hours to complete. In view of the high capital equipment costs, duplication of capabilities is very costly, making response to market cllom~nt1.c difficult.
Hot cure systems are also ~usc~lible to chrink~ge both longit~l-1in~11y and s diametrically. This can produce a number of problems including doubts as to the structural integrity of the pipeline. Longitudinal chrink~ge may result in infiltration and blockages, particularly in respect of connections to branch lines. For example, where the liner shrinks after the connections for the branch line have been cut, the cut out portion of the liner may move further along the pipe wall resulting in infiltration through the 10 liner. Further, movement of the liner with chrink~ge may result in the liner moving across and blocking the branch conn~ctinn-It is also difficult to stop infiltration, or flow from a branch line during therehabilitation process. This can result in the heated liner coming into con tact with a head of water. The water causes what is known as a "cold spot" in the hot cure method.
15 This cold spot can inhibit the curing process which in turn leads to a failure of the line.
Often hot cure PVC liners do not expand beyond the diameter of the host pipe.
This can result in an in-l~nt~tion not forming where the branch line connects to the m~inlin~- This makes location of laterals and branches very difficult and time C(~ g Further, hot cure PVC lines normally require their branch line connections 20 to be cut using an c;x~,~nsi~e remotely operated internal lateral cutter. Hot cure PVC
liners also normally require two access points to the host pipe.
Cold cure techniques are also known, most notably, a system using an inverted liner saturated with resin. The liner is turned inside out or inverted and then forced into CA 02230~38 1998-02-26 W O 97/08487 PCT/AU9G~-~8 position in the pipeline by ~J~cs~ ised water normally produced by a static head of water in a vertical inversion tube or pre;,~ vessel being fed into an open end of the liner.
Though ambient or cold cure resins can be used with this system, thermo activated polyester resin systems are ~lc;r~ d.
DISCLOSURE OF THE INVENTION
The present invention seeks to overcome or at least ameliorate the above problems associated with the prior art by providing a cold cure method of lining existing pipelines in-situ.
According to the present invention there is provided a method for rehabilit~tinp0 exi~ting pipelines in-situ comprising the following steps:
a) forming a tubular liner of a generally absorbent m~teri~l;
b) feeding at least one exr~n-l~ble bladder into said liner;
c) hll~Le~ l;. .E said liner with a cold curable resin;
d) coating an e~tern~l surface of said liner and/or the int~rn~l surface of the pipeline to be rehabilitated with a water resistant adhesive co~ting;
e) feeding said liner into the pipeline to be rehabilitated together with its associated bladder;
f) infl~ting said bladder with a gaseous fluid to force the liner against the intt-rn~l wall of said pipeline; and g) m~ g said inflation until the resin impregn~tecl liner has cured.
Preferably, the method includes the further steps of removing the bladder from the cured liner. In a ~.~;re..~d form, the liner is formed of a felt-like m~teri~l For W O 97/08487 PCT/AU~ '38 preference, the bladder is coated with a release agent prior to insertion into the liner tube.
Preferably, the gaseous fluid is co,-,pr,s~ed air.
The resin curing time may be adjusted by adjusting the ratios of base resin and catalysts used. Further, where ~t~ntled curing time is required, the resin may be cooled s below ambient telll~ldlule during the set up process.
BRIEF DESCRIPTION OF THE DRAWINGS
A ~,er~ d embodiment of the present invention will now be described, by way of example only, with reference to the ~ccol,.~ yillg drawings in which:
Figure 1 shows a pictorial ~ rest;~ lion of the liner prior to insertion into the host 1 0 pipe, Figure 2 shows a sectional .~ .,e"l~lion of the liner and bladder prior to insertion into the host pipe, Figure 3 shows a sectional part cutaway representation of the liner inserted into the pipeline.
Figure 4 shows a pictorial ,~>.~ s~ ~lion of the lining method where there is only a single access point and a boundary trap at one end.
MODES FOR CARRYING OUT THE INVENTION
Before ~ cll~sinp~ the process or method used in lining e~i~tin~ pipelines, an initial description of the m~t~.ri~l~ used will be provided. The liner 5 is typically a felt-like 20 m~ .rizll with a flexible coating 6 applied to the outside of the felt. Typically, the felt is formed from interlocked polyester with a thin membrane of polyu,c~ll,aLle forming the flexible coating. It is tubed, stitl~h~cl or vulcanised to form the shape of the pipeline.
One or more extruded tubes 7 are coated with a release agent and inserted inside the felt CA 02230~38 1998-02-26 tube or liner 5 to form an inflatable bladder. The extruded tubes 7 are typically formed of PVC or other suitable plastics m~tçri~l although any form of flexible tubing capable of forming an inflatable bladder cont~inin~ co,.,~ ssed air may be used. The inflatable bladder 7 may be inserted in the liner 5 before or after the felt is stitched or vulc~ni~erl The steps of a plefe.,ed method of lining an existing pipeline 8 will now be discussed with reference to the accompanying drawings. Firstl,v, the pipeline 8 to be lined is surveyed to access the length of pipeline to be lined and the location of any relevant junctions. These junction distances are then marked on the liner 5 and a thin flexible additional piece of tubing 9 is attached to the liner 5, as best shown in Figure 1.
0 This additional tubing 9 is optional, but desirable, in that it prevents excess resin impregn~ting the liner 5 from bulging into the junctions and also assists in the cutting of the junctions once the liner 5 is cured.
The liner 5 is next placed in a straight line on the ground and air plugs 10, 1 1 inserted into each end of the inflatable bladder 7. A short piece of tubing 12 is placed overtheendofbladder7adjacenttheairplug 10,11 andtheairplug 10,11 isinfl~te-1to retain the bladder end 13 between the air plug 10, 1 1 and the short piece of tubing 12.
Air is supplied to the air plugs by air line 3 and to the bladder 7 by air line 4. The end of the bladder 13 is spaced from the end of the liner 14 to prevent the end of the liner being retained. The liner S is then infl~t~otl through one or both of the air plugs 10, 1 1. The 20 liner 5 is infl~f~d sufficiently to form the desired shape of the pipeline 8 to be relined.
Once this is done both air plugs 10, 11 are pulled in opposite directions so as to stretch the bladder 7 within the felt liner 5. This process elimins~tes any ridges. The air plugs 10, 11 are then deflated and removed. The bladder 7 is also deflated.
CA 02230~38 1998-02-26 W O 97/08487 PCT/AU~C/0~'~8 -6-A cold cure resin is then mixed and introduced b~lwtiell the bladder 7 and the felt liner 5 such that the resin impregnates into the liner material. The liner S can then be winched into position within the pipe 8 to be rehabilitated. As it is being winched into position through an access hole 15, a water resistant adhesive coating 16 is applied to 5 outer flexible coating 6 of the liner 5. This water resistant coating 16 helps prevent infiltration in the rehabilitated pipe 8.
Once the liner 5 is winched into the correct position within the pipe 8, a blank air or me~hAnical plug 17 is inserted in one end of the liner inside the bladder end and a flow through air plug 18 is inserted in the other end of the bladder in the same manner.
10 The bladder 7 is then inflAte~l using col~ si,ed air. Once inflAt~-l the bladder 7 may be stretched to remove any ridges. A number of deflated bladders 7 may be used inside the liner 5 as a form of security. Should the outer bladder fail through bursting or fails to hold ~ i7i7We for any reason, then the air plugs 17, 18 are easily removed and inserted into a spare bladder.
The resin is then allowed to cure for the required time. During the curing process, the liner 5 is held against the inner wall 19 of the pipeline 8 by the pressurised bladder 7.
The liner S is also AttArhet1 to the inner wall 19 by means of the water resistant a&esive 16 previously applied. Following completion of the curing process, the plugs 17, 18 are removed and the internAl bladder 7 removed after deflation. Preferably, the bladder 7 is 20 attached to a cable which rotates the bladder tubing 7 while withdrawing it from the liner.
Once this stage is completed, the junctions can be cut int~rnAlly by use of a remote control lateral cutter working in conjunction with a closed circuit TV (CCTV) camera.
CA 02230~38 1998-02-26 ~lternzltively, an electric drain cleaner can be used e~t.on~lly to cut the junctions from relative access points.
Where there is only one access point to the pipeline 8 to be relined, the liner 5 is pushed into position with hand rods or other suitable means. The remote ends of the s bladder 7 are sealed to prevent escape of inflation air and a flow through plug 18 is inserted into the ~cc~cihle end of the bladder 7. The process is then performed in a similar manner to that described above.
In the case, where the only other access to the pipeline is a boundary trap, themethod according to a further aspect of the present invention includes introducing a o CCTV camera through the boundary trap to monitor and ensure correct positioning of the liner in the pipeline. This is shown in Figure 4. The liner S has one end 20 sealed.
This end 20 is pushed toward the boundary trap 21 using hand rods (not shown) or the like until the CCTV camera 22 shows that the liner 5 is CO~ Lly positioned within the pipeline 8. The liner S can then be infl~te(l using the intern~l bladder 7 in the usual manner through the ~ccecsible end via flowthrough plug 18.
It will be lln-lerst()od that the present invention overcomes or at least ameliorates the problems of ~hrink~ge by use of an adhesive between the liner and the pipeline as well as a cold cure technique. Further the cold cure technique enables long lengths of pipe to be rehabilitated without the use of expensive, sophisticated eq ~ipment It will be appreciated that further embo-liment~ and exemplifications of the invention are possible without departing from the spirit or scope of the invention described and the invention is not limited to the particular embo~liment~ described.
TECHNICAL FIELD
The present invention relates to rehabilit~ting Pxietinp pipelines of various lengths s and diameters and, in particular, to a method for performing such rehabilitation.
BACKGROUND ART
Und&~ ou"d pipe systems deteriorate over time as a result of degradation of m~t~ri~le and outside influences such as tree roots, co",~l~;s:iion from above, expansion and contraction and numerous other factors. In order to avoid the expense of excavating 0 the pipes and replacing them a nurnber of "in situ" rehabilitation techniques have been developed. Most of these systems involve lining int~rn~lly the old pipe using a plastic liner which is fed into the old pipe via exieting manholes or other ~xieting access points.
The liner is normally exrzn~1ecl into the required position against the int~rn~l wall ofthe t-xieting pipe and cured to provide a rehabilitated pipe.
Known techniques typically use polyvinylchloride (PVC) liners which are hot-cured. The liner is fed into the çxietinf~ pipe in a heated and softened form and then is further heated and P!xr~n~1çcl using ~ ul;sed steam to force the liner against the intf rn~l wall of the ~xieting pipe. The steam is then replaced by ~.le;,~;lll ;ee-l air and the liner allowed to cool and cure while still being held firmly against the intern~l pipe wall.
Such systems have a number of disadvantages. They require expensive, speci~liee~l plant and eqllipment For example, special semi-trailers, capable of carrying large in~llletri~l generators and c-,llll,l.,;,~ors. The capital equipment may cost in the order of hundreds of thousands of dollars and is required by each crew to rehabilitate CA 02230~38 1998-02-26 each pipeline. Each pipeline may take of the order of 6-12 hours to complete. In view of the high capital equipment costs, duplication of capabilities is very costly, making response to market cllom~nt1.c difficult.
Hot cure systems are also ~usc~lible to chrink~ge both longit~l-1in~11y and s diametrically. This can produce a number of problems including doubts as to the structural integrity of the pipeline. Longitudinal chrink~ge may result in infiltration and blockages, particularly in respect of connections to branch lines. For example, where the liner shrinks after the connections for the branch line have been cut, the cut out portion of the liner may move further along the pipe wall resulting in infiltration through the 10 liner. Further, movement of the liner with chrink~ge may result in the liner moving across and blocking the branch conn~ctinn-It is also difficult to stop infiltration, or flow from a branch line during therehabilitation process. This can result in the heated liner coming into con tact with a head of water. The water causes what is known as a "cold spot" in the hot cure method.
15 This cold spot can inhibit the curing process which in turn leads to a failure of the line.
Often hot cure PVC liners do not expand beyond the diameter of the host pipe.
This can result in an in-l~nt~tion not forming where the branch line connects to the m~inlin~- This makes location of laterals and branches very difficult and time C(~ g Further, hot cure PVC lines normally require their branch line connections 20 to be cut using an c;x~,~nsi~e remotely operated internal lateral cutter. Hot cure PVC
liners also normally require two access points to the host pipe.
Cold cure techniques are also known, most notably, a system using an inverted liner saturated with resin. The liner is turned inside out or inverted and then forced into CA 02230~38 1998-02-26 W O 97/08487 PCT/AU9G~-~8 position in the pipeline by ~J~cs~ ised water normally produced by a static head of water in a vertical inversion tube or pre;,~ vessel being fed into an open end of the liner.
Though ambient or cold cure resins can be used with this system, thermo activated polyester resin systems are ~lc;r~ d.
DISCLOSURE OF THE INVENTION
The present invention seeks to overcome or at least ameliorate the above problems associated with the prior art by providing a cold cure method of lining existing pipelines in-situ.
According to the present invention there is provided a method for rehabilit~tinp0 exi~ting pipelines in-situ comprising the following steps:
a) forming a tubular liner of a generally absorbent m~teri~l;
b) feeding at least one exr~n-l~ble bladder into said liner;
c) hll~Le~ l;. .E said liner with a cold curable resin;
d) coating an e~tern~l surface of said liner and/or the int~rn~l surface of the pipeline to be rehabilitated with a water resistant adhesive co~ting;
e) feeding said liner into the pipeline to be rehabilitated together with its associated bladder;
f) infl~ting said bladder with a gaseous fluid to force the liner against the intt-rn~l wall of said pipeline; and g) m~ g said inflation until the resin impregn~tecl liner has cured.
Preferably, the method includes the further steps of removing the bladder from the cured liner. In a ~.~;re..~d form, the liner is formed of a felt-like m~teri~l For W O 97/08487 PCT/AU~ '38 preference, the bladder is coated with a release agent prior to insertion into the liner tube.
Preferably, the gaseous fluid is co,-,pr,s~ed air.
The resin curing time may be adjusted by adjusting the ratios of base resin and catalysts used. Further, where ~t~ntled curing time is required, the resin may be cooled s below ambient telll~ldlule during the set up process.
BRIEF DESCRIPTION OF THE DRAWINGS
A ~,er~ d embodiment of the present invention will now be described, by way of example only, with reference to the ~ccol,.~ yillg drawings in which:
Figure 1 shows a pictorial ~ rest;~ lion of the liner prior to insertion into the host 1 0 pipe, Figure 2 shows a sectional .~ .,e"l~lion of the liner and bladder prior to insertion into the host pipe, Figure 3 shows a sectional part cutaway representation of the liner inserted into the pipeline.
Figure 4 shows a pictorial ,~>.~ s~ ~lion of the lining method where there is only a single access point and a boundary trap at one end.
MODES FOR CARRYING OUT THE INVENTION
Before ~ cll~sinp~ the process or method used in lining e~i~tin~ pipelines, an initial description of the m~t~.ri~l~ used will be provided. The liner 5 is typically a felt-like 20 m~ .rizll with a flexible coating 6 applied to the outside of the felt. Typically, the felt is formed from interlocked polyester with a thin membrane of polyu,c~ll,aLle forming the flexible coating. It is tubed, stitl~h~cl or vulcanised to form the shape of the pipeline.
One or more extruded tubes 7 are coated with a release agent and inserted inside the felt CA 02230~38 1998-02-26 tube or liner 5 to form an inflatable bladder. The extruded tubes 7 are typically formed of PVC or other suitable plastics m~tçri~l although any form of flexible tubing capable of forming an inflatable bladder cont~inin~ co,.,~ ssed air may be used. The inflatable bladder 7 may be inserted in the liner 5 before or after the felt is stitched or vulc~ni~erl The steps of a plefe.,ed method of lining an existing pipeline 8 will now be discussed with reference to the accompanying drawings. Firstl,v, the pipeline 8 to be lined is surveyed to access the length of pipeline to be lined and the location of any relevant junctions. These junction distances are then marked on the liner 5 and a thin flexible additional piece of tubing 9 is attached to the liner 5, as best shown in Figure 1.
0 This additional tubing 9 is optional, but desirable, in that it prevents excess resin impregn~ting the liner 5 from bulging into the junctions and also assists in the cutting of the junctions once the liner 5 is cured.
The liner 5 is next placed in a straight line on the ground and air plugs 10, 1 1 inserted into each end of the inflatable bladder 7. A short piece of tubing 12 is placed overtheendofbladder7adjacenttheairplug 10,11 andtheairplug 10,11 isinfl~te-1to retain the bladder end 13 between the air plug 10, 1 1 and the short piece of tubing 12.
Air is supplied to the air plugs by air line 3 and to the bladder 7 by air line 4. The end of the bladder 13 is spaced from the end of the liner 14 to prevent the end of the liner being retained. The liner S is then infl~t~otl through one or both of the air plugs 10, 1 1. The 20 liner 5 is infl~f~d sufficiently to form the desired shape of the pipeline 8 to be relined.
Once this is done both air plugs 10, 11 are pulled in opposite directions so as to stretch the bladder 7 within the felt liner 5. This process elimins~tes any ridges. The air plugs 10, 11 are then deflated and removed. The bladder 7 is also deflated.
CA 02230~38 1998-02-26 W O 97/08487 PCT/AU~C/0~'~8 -6-A cold cure resin is then mixed and introduced b~lwtiell the bladder 7 and the felt liner 5 such that the resin impregnates into the liner material. The liner S can then be winched into position within the pipe 8 to be rehabilitated. As it is being winched into position through an access hole 15, a water resistant adhesive coating 16 is applied to 5 outer flexible coating 6 of the liner 5. This water resistant coating 16 helps prevent infiltration in the rehabilitated pipe 8.
Once the liner 5 is winched into the correct position within the pipe 8, a blank air or me~hAnical plug 17 is inserted in one end of the liner inside the bladder end and a flow through air plug 18 is inserted in the other end of the bladder in the same manner.
10 The bladder 7 is then inflAte~l using col~ si,ed air. Once inflAt~-l the bladder 7 may be stretched to remove any ridges. A number of deflated bladders 7 may be used inside the liner 5 as a form of security. Should the outer bladder fail through bursting or fails to hold ~ i7i7We for any reason, then the air plugs 17, 18 are easily removed and inserted into a spare bladder.
The resin is then allowed to cure for the required time. During the curing process, the liner 5 is held against the inner wall 19 of the pipeline 8 by the pressurised bladder 7.
The liner S is also AttArhet1 to the inner wall 19 by means of the water resistant a&esive 16 previously applied. Following completion of the curing process, the plugs 17, 18 are removed and the internAl bladder 7 removed after deflation. Preferably, the bladder 7 is 20 attached to a cable which rotates the bladder tubing 7 while withdrawing it from the liner.
Once this stage is completed, the junctions can be cut int~rnAlly by use of a remote control lateral cutter working in conjunction with a closed circuit TV (CCTV) camera.
CA 02230~38 1998-02-26 ~lternzltively, an electric drain cleaner can be used e~t.on~lly to cut the junctions from relative access points.
Where there is only one access point to the pipeline 8 to be relined, the liner 5 is pushed into position with hand rods or other suitable means. The remote ends of the s bladder 7 are sealed to prevent escape of inflation air and a flow through plug 18 is inserted into the ~cc~cihle end of the bladder 7. The process is then performed in a similar manner to that described above.
In the case, where the only other access to the pipeline is a boundary trap, themethod according to a further aspect of the present invention includes introducing a o CCTV camera through the boundary trap to monitor and ensure correct positioning of the liner in the pipeline. This is shown in Figure 4. The liner S has one end 20 sealed.
This end 20 is pushed toward the boundary trap 21 using hand rods (not shown) or the like until the CCTV camera 22 shows that the liner 5 is CO~ Lly positioned within the pipeline 8. The liner S can then be infl~te(l using the intern~l bladder 7 in the usual manner through the ~ccecsible end via flowthrough plug 18.
It will be lln-lerst()od that the present invention overcomes or at least ameliorates the problems of ~hrink~ge by use of an adhesive between the liner and the pipeline as well as a cold cure technique. Further the cold cure technique enables long lengths of pipe to be rehabilitated without the use of expensive, sophisticated eq ~ipment It will be appreciated that further embo-liment~ and exemplifications of the invention are possible without departing from the spirit or scope of the invention described and the invention is not limited to the particular embo~liment~ described.
Claims (9)
1. A method for rehabilitating existing pipelines in-situ comprising the following steps:
a) forming a tubular liner of a generally absorbent material;
b) feeding at least one expandable bladder into said liner;
c) impregnating said liner with a cold curable resin;
d) coating an external surface of said liner and/or the internal surface of the pipeline to be rehabilitated with a water resistant adhesive coating;
e) feeding said liner into the pipeline to be rehabilitated together with its associated bladder;
f) inflating said bladder with a gaseous fluid to force the liner against the internal wall of said pipeline; and g) maintaining said inflation until the resin impregnated liner has cured.
a) forming a tubular liner of a generally absorbent material;
b) feeding at least one expandable bladder into said liner;
c) impregnating said liner with a cold curable resin;
d) coating an external surface of said liner and/or the internal surface of the pipeline to be rehabilitated with a water resistant adhesive coating;
e) feeding said liner into the pipeline to be rehabilitated together with its associated bladder;
f) inflating said bladder with a gaseous fluid to force the liner against the internal wall of said pipeline; and g) maintaining said inflation until the resin impregnated liner has cured.
2. A method according to claim 1 including the further step of removing the bladder from the cured liner.
3. A method according to claim 1 or claim 2 wherein the liner is formed of a felt-like material.
4. A method according to claim 3 wherein the felt-like material is formed from interlocked polyester with a thin membrane of polyurethane forming a flexible outer covering.
5. A method according to claim 1 wherein the bladder is coated with a release agent prior to insertion into the liner tube.
6. A method according to claim 1 wherein the gaseous fluid is compressed air.
7. A method according to claim 1 including the step of cooling the resin impregnated liner below ambient temperature prior to step (e) to lengthen the curing time of the resin.
8. A method according to claim 1 including the step of reinforcing the regions of the liner which, in use, coincide with junction points along the pipeline.
9. A method according to claim 1 wherein the pipeline to be rehabilitated has access at one end for feeding in of said liner and the only other access to the pipeline being a boundary trap, the method including the step of introducing a TV camera through the boundary trap to monitor and ensure correct positioning of the liner in the pipeline.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPN5110A AUPN511095A0 (en) | 1995-08-29 | 1995-08-29 | Pipe rehabilitation |
| AUPN5110 | 1995-08-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2230538A1 true CA2230538A1 (en) | 1997-03-06 |
Family
ID=3789438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002230538A Abandoned CA2230538A1 (en) | 1995-08-29 | 1996-08-28 | Pipe rehabilitation |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0850381A1 (en) |
| AU (1) | AUPN511095A0 (en) |
| CA (1) | CA2230538A1 (en) |
| NZ (1) | NZ315541A (en) |
| WO (1) | WO1997008487A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9711294D0 (en) * | 1997-06-03 | 1997-07-30 | Autotte Jean Bernard | Apparatus and method for lining of passageways |
| FI982416A (en) * | 1998-11-06 | 2000-05-07 | Suomen Putkisaneeraus | Flow channel repair material |
| US6868870B2 (en) | 2002-10-30 | 2005-03-22 | Daniel Warren | Method of lining a pipeline using a calibration hose |
| US7849883B2 (en) * | 2005-05-02 | 2010-12-14 | Nuflow Technologies 2000 Inc. | Liner assembly for pipeline repair and methods of installing same |
| US7270150B2 (en) | 2005-06-14 | 2007-09-18 | Warren Environmental, Inc. | Method of lining a pipeline |
| FR2911078B1 (en) * | 2007-01-05 | 2010-12-24 | Inst Francais Du Petrole | EXTENSIBLE REINFORCEMENT OF INTERNAL COATING RESTRUCTURING. |
| US8591695B2 (en) | 2008-03-14 | 2013-11-26 | Danny Warren | Method and composition for lining a pipe |
| WO2013163736A1 (en) * | 2012-05-02 | 2013-11-07 | Nu Flow Technologies 2000 Inc. | Liner assembly for pipeline repair or reinforcement and method of installing same |
| ES2893537T3 (en) | 2014-04-17 | 2022-02-09 | Warren Env & Coating Llc | Method of lining and repairing a large diameter pipe |
| CN114458856A (en) * | 2021-12-16 | 2022-05-10 | 堡森(上海)新材料科技有限公司 | Device and method for repairing water-carrying structure of in-service pipeline |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2665088A (en) * | 1987-12-07 | 1989-06-08 | Neil John Stephens | Improved pipe liner and method |
| DE3906057A1 (en) * | 1988-07-21 | 1990-01-25 | Hans Mueller | METHOD FOR LINING A PIPE PUT IN GROUND |
| GB9203005D0 (en) * | 1992-02-13 | 1992-03-25 | Insituform Group Ltd | Improvements relating to the lining of pipelines or passageways |
| AU694172B2 (en) * | 1994-04-11 | 1998-07-16 | Cant, Richard Samuel | Lining material |
-
1995
- 1995-08-29 AU AUPN5110A patent/AUPN511095A0/en not_active Abandoned
-
1996
- 1996-08-28 WO PCT/AU1996/000538 patent/WO1997008487A1/en not_active Application Discontinuation
- 1996-08-28 CA CA002230538A patent/CA2230538A1/en not_active Abandoned
- 1996-08-28 NZ NZ315541A patent/NZ315541A/en not_active IP Right Cessation
- 1996-08-28 EP EP96927455A patent/EP0850381A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0850381A1 (en) | 1998-07-01 |
| NZ315541A (en) | 1999-08-30 |
| AUPN511095A0 (en) | 1995-09-21 |
| WO1997008487A1 (en) | 1997-03-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |