WO2023023799A1 - Pipe repair system - Google Patents
Pipe repair system Download PDFInfo
- Publication number
- WO2023023799A1 WO2023023799A1 PCT/AU2022/051027 AU2022051027W WO2023023799A1 WO 2023023799 A1 WO2023023799 A1 WO 2023023799A1 AU 2022051027 W AU2022051027 W AU 2022051027W WO 2023023799 A1 WO2023023799 A1 WO 2023023799A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pipe
- tape
- reinforcement tape
- hdpe
- hdpe pipe
- Prior art date
Links
- 230000008439 repair process Effects 0.000 title abstract description 26
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 110
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 110
- 230000002787 reinforcement Effects 0.000 claims abstract description 83
- 238000004804 winding Methods 0.000 claims abstract description 50
- 239000002131 composite material Substances 0.000 claims abstract description 34
- 239000004593 Epoxy Substances 0.000 claims abstract description 29
- 239000000853 adhesive Substances 0.000 claims abstract description 28
- 230000001070 adhesive effect Effects 0.000 claims abstract description 28
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000003522 acrylic cement Substances 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 21
- 238000011065 in-situ storage Methods 0.000 abstract description 3
- 230000003014 reinforcing effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000009972 noncorrosive effect Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/02—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
-
- 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
- F16L55/1686—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by winding a tape
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/346—Applications of adhesives in processes or use of adhesives in the form of films or foils for building applications e.g. wrap foil
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2423/00—Presence of polyolefin
- C09J2423/04—Presence of homo or copolymers of ethene
- C09J2423/046—Presence of homo or copolymers of ethene in the substrate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2423/00—Presence of polyolefin
- C09J2423/04—Presence of homo or copolymers of ethene
- C09J2423/048—Presence of homo or copolymers of ethene in the pretreated surface to be joined
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
- C09J2433/003—Presence of (meth)acrylic polymer in the primer coating
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2463/00—Presence of epoxy resin
-
- 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
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
-
- 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
- F16L55/1683—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of a patch which is fixed on the wall of the pipe by means of an adhesive, a weld or the like
-
- 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
- F16L55/17—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose
-
- 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
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
Definitions
- the present invention relates generally to a system for repairing damaged High-density Polyethylene (HDPE) pipe.
- HDPE High-density Polyethylene
- HDPE High-density Polyethylene
- HDPE pipes are very popular for domestic, mining, industrial and irrigation applications, and often provide advantages over alternative piping solutions such as iron, steel or cement pipes.
- HDPE pipes are commonly used for both above and below ground pipelines, including pressurised water or gas supply pipe applications, and for sewerage pipe applications.
- Defects are normally detected by visual recognition where the pipe has visually been scratched, gouged and/or squashed during transportation, installation or excavation.
- the method of repair is usually selected on location and depends on the type of defect, size and risk profile associated with a pipe rupture.
- the operator typically considers the pipeline downtime and commercial evaluation of the repair. Some operators must close production plants to conduct a repair, which can be expensive, so repair options must be considered carefully.
- the invention resides in a system for repairing a High-density Polyethylene (HDPE) pipe, the system comprising: a damaged section of the HDPE pipe; an adhesive primer applied to an outer surface of the damaged section of the HDPE pipe and substantially surrounding the damaged section of the HDPE pipe; windings of reinforcement tape wrapped around the damaged section of the HDPE pipe and covering the adhesive primer, wherein at least one winding of the reinforcement tape substantially overlaps another winding of the reinforcement tape, thereby bonding the reinforcement tape to the HDPE Pipe; at least one strapping band wrapped around the reinforcement tape; and windings of composite epoxy tape wrapped around the reinforcement tape and the at least one strapping band, wherein at least one winding of the composite epoxy tape substantially overlaps another winding of the composite epoxy tape.
- HDPE High-density Polyethylene
- the damaged section defines a damage start point and a damage end point along a longitudinal distance of the pipe
- the adhesive primer extends longitudinally along the HDPE pipe a distance about 1.5 times the outer diameter of the pipe, both before the damage start point and after the damage end point.
- the adhesive primer is a liquid adhesion agent, or an adhesion patch which adheres to the HDPE pipe.
- the reinforcement tape or the composite epoxy tape overlaps in a spiral manner.
- the reinforcement tape interlocks with itself by overlay or by design with an interlocking shape.
- the reinforcement tape or the composite epoxy tape overlaps in a concentric manner.
- At least one winding of the reinforcement tape overlaps between 20% and 50% of another winding of the reinforcement tape.
- At least one winding of the composite epoxy tape overlaps between 20% and 50% of another winding of the composite epoxy tape.
- the reinforcement tape has a modulus of elasticity greater than that of the HDPE pipe.
- the reinforcement tape has a high temperature rating greater than that of the damaged HDPE pipe.
- a plurality of strapping bands are positioned equidistant from each other along the pipe.
- the composite epoxy tape comprises fiberglass.
- the at least one strapping band includes a tensioning device.
- the tensioning device comprises a clamp and mechanical torsion device.
- the tensioning device comprises a ratchet type mechanical device.
- the damaged section of the HDPE pipe is at a bend in the HDPE pipe.
- the damaged section of the HDPE pipe is in a coupler of the HDPE pipe.
- the reinforcement tape comprises stainless steel.
- the reinforcement tape comprises teeth to engage with the HDPE pipe.
- the reinforcement tape comprises a mechanism to lock overlapping sections of the reinforcement tape in a plane that allows the reinforcement tape to be tensioned.
- FIG. 1 is a schematic diagram representing longitudinal stress and hoop stress in a HDPE pipe when under pressure.
- FIG. 2 is a cross sectional diagram of a repair system implemented on the damaged HDPE pipe, according to some embodiments of the present invention.
- FIG. 3 is a schematic side view of a repaired HDPE pipe, with the defect having a damage start point and a damage end point along a longitudinal distance of the pipe, according to some embodiments of the present invention.
- FIG. 4 is further schematic side view of the repaired HDPE pipe of FIG. 3, showing the winding of the reinforcement tape wrapped around the HDPE pipe, in a spiral manner, and covering the adhesive primer.
- FIG. 5 is yet a further schematic side view of the repaired HDPE pipe of FIG. 3, depicting a strapping band wrapped around the reinforcement tape to provide additional reinforcement.
- FIG. 6 is a final schematic side view of the straight section of the repaired HDPE pipe of FIG. 3, with the composite epoxy tape covering all the preceding layers of adhesive primer, reinforcement tape and strapping bands, as applied to unify the repair system.
- FIG.7 is a schematic diagram illustrating a bent HDPE pipe as repaired using a pipe repair system, according to some embodiments of the present invention.
- FIG.8 is a schematic diagram illustrating an example of a reinforcement tape interlocking system based on the shape of the reinforcement tape, according to some embodiments of the present invention.
- FIG.9 is a schematic diagram illustrating the top view of another interlocking tape design, according to some embodiments of the present invention.
- FIG. 10 is a schematic diagram illustrating the side view of the interlocking tape shown in FIG. 9.
- the present invention relates to a system for repairing damaged HDPE pipes. Elements of the invention are illustrated in concise outline form in the drawings, showing only those specific details that are necessary to understanding the embodiments of the present invention, but so as not to clutter the disclosure with excessive detail that will be obvious to those of ordinary skill in the art in light of the present description.
- adjectives such as first and second, left and right, above and below, top and bottom, upper and lower, rises and falls, upward and downward, etc., are used solely to define one element or method step from another element or method step without necessarily requiring a specific relative position or sequence that is described by the adjectives.
- Words such as “comprises” or “includes” are not used to define an exclusive set of elements or method steps. Rather, such words merely define a minimum set of elements or method steps included in a particular embodiment of the present invention.
- the present invention is defined as a system for repairing a High-density Polyethylene (HDPE) pipe, the system comprising: a damaged section of the HDPE pipe; an adhesive primer applied to an outer surface of the damaged section of the HDPE pipe and substantially surrounding the damaged section of the HDPE pipe.
- HDPE High-density Polyethylene
- windings of reinforcement tape wrapped around the damaged section of the HDPE pipe and covering the adhesive primer wherein at least one winding of the reinforcement tape substantially overlaps another winding of the reinforcement tape, thereby bonding the reinforcement tape to the HDPE Pipe; at least one strapping band wrapped around the reinforcement tape to provide additional reinforcement; and windings of composite epoxy tape wrapped around the reinforcement tape and the at least one strapping band, wherein at least one winding of the composite epoxy tape substantially overlaps another winding of the composite epoxy tape.
- Advantages of some embodiments of the present invention include providing a system for repairing damaged HDPE pipes which can be used regardless of pipe wall thickness, pipe diameter, length or nature of the defect to be repaired, and pressure of the medium transitioning through the damaged HDPE pipe. Furthermore, the system does not require any mechanical means such as bolting or clamping, thereby alleviating excessive compressive stress on the HDPE pipe or relaxation of mechanical parts due to temperature and pressure cycling which can lead to premature pipe failure.
- the system also allows for mitigating both the hoop and longitudinal stress once applied to a damaged HDPE pipe, thereby providing a means of strengthening the repaired HDPE pipe.
- the system can be applied to complex pipe geometries including but not limited to bends, T junction welded pipe saddles and welded jointing couplers. In addition, the systems often can be implemented in situ while the damaged pipe remains in operation, thereby limiting downtime.
- FIG. 1 is a schematic diagram representing a HDPE pipe 100 with a transitioning medium applying a pressure 101 into the inner surface of the pipe 100 and a defect 102 on the pipe 100.
- the defect 102 may have been caused by various actions, such as faulty installation or a stone indentation or pipe vibration rubbing on a rock, and may include a puncture, cracks, or a scrape/gouge along the pipe 100.
- the defect 102 is defined by a damage start point 103 and a damage end point 104 along a longitudinal distance of the pipe 100.
- the pressure 101 inside the pipe 100 induces two stress components on the pipe wall: a hoop stress or tangential stress 105, which is the stress around the circumference of the pipe 100 and the longitudinal stress 106 along the length of the pipe 100.
- FIG. 2 is a cross sectional diagram of a repair system of the present invention as implemented on the damaged HDPE pipe 100.
- the HDPE pipe 100 is first coated with a layer of adhesive primer 200, followed by windings of reinforcement tape 300, at least one strapping band (not shown in FIG. 2) wrapped around the reinforcement tape to provide additional reinforcement, and windings of composite epoxy tape 400.
- the section of the pipe 100 near the defect 102 is exposed and then adequately cleaned to remove dirt and other debris.
- the cleaning can also involve lightly abrading or roughening of the HDPE pipe 100 surface to increase the surface area for the adhesive primer, thereby increasing the coverage of the adhesive primer onto the HDPE pipe 100.
- the adhesive primer 200 is then applied around the entire circumference of the HDPE pipe 100.
- a purpose of the adhesive primer 200 is to enable the subsequent bonding of the windings of reinforcement tape 300 onto the HDPE pipe 100.
- the adhesive primer 200 can be, for example but not limited to, a two-part acrylic adhesive, such as Scotch-WeldTM DP8010 manufactured by the 3M company, or a liquid adhesion agent, or an adhesion patch which adheres to the HDPE pipe 100.
- the reinforcement tape 300 can be made from, for example, a material which is noncorrosive. Such examples include stainless steel tapes or carbon fibre tapes.
- the reinforcement tape 300 is made to deform around the HDPE pipe 100 such that it becomes cohesively set in place around the damaged section of the HDPE pipe 100.
- the reinforcement tape 300 is manufactured from a perforated material which grips to the HDPE pipe 100 to increase the pipe strength.
- the reinforcement tape 300 has a high temperature rating and/or a modulus of elasticity greater than that of the damaged HDPE pipe 100.
- FIG. 3 is a schematic side view of the repaired HDPE pipe 100, with the defect 102 having a damage start point 103 and a damage end point 104 along a longitudinal distance of the pipe 100.
- the reinforcement tape 300 is wrapped in a spiral manner above the adhesive primer 200. Alternatively, the reinforcement tape 300 can be wrapped in a concentric manner. To ensure the maximum efficiency of the repair system, the reinforcement tape 300 extends longitudinally along the HDPE pipe 100 a distance a nominal 1 .5 times the outer diameter of the HDPE pipe 100, both before the damage start point 103 and after the damage end point 104 of the defect. Also, the adhesive primer 200 extends longitudinally along the HDPE pipe 100 substantially beyond the reinforcement tape 300.
- FIG. 4 is further schematic side view of the repaired HDPE pipe 100, showing the winding of the reinforcement tape 300 wrapped around the HDPE pipe 100, in a spiral manner, and covering the adhesive primer 200. Windings of the reinforcement tape 300 overlap about 20% of other windings of the reinforcement tape 300, thereby providing additional strength to alleviate longitudinal stress. As will be understood by those skilled in the art, the winding overlap can be further increased, for example to a 50% overlap, to compensate for higher pipe pressures. Alternatively, the reinforcement tape 300 can be wrapped in a concentric manner (not shown in FIG. 3). According to some embodiments, the winding overlap will be generally between 20% and 50%.
- FIG. 5 is yet a further schematic side view of the repaired HDPE pipe 100, depicting a strapping band 500 wrapped around the reinforcement tape 300 to provide additional reinforcement.
- a plurality of strapping bands 500 are positioned equidistant from each other along the HDPE pipe 100.
- the strapping bands 500 are installed with a tensioning device over the reinforcement tape 300 at calculated points to bind the reinforcement tape 300 to the HDPE pipe 100.
- the strapping bands can be made, for example, of stainless steel, polymers or composites, or various other noncorrosive materials with sufficient mechanical strength.
- FIG. 6 is a schematic side view of a straight section of repaired HDPE pipe 100, with the composite epoxy tape 400 covering all the preceding layers of adhesive primer 200, reinforcement tape 300 and strapping bands 500, as applied to unify the repair system.
- the windings of the composite epoxy tape 400 are wrapped in a spiral manner, and overlap about 20% of another winding of the tape 400, thereby providing additional strength to alleviate longitudinal stress. Similar to the windings of the reinforcement tape 300, the winding overlap of the composite epoxy tape 400 can be further increased, for example to a 50% overlap, to compensate for higher pipe pressures. According to some embodiments, the winding overlap will be generally between 20% and 50%.
- the composite epoxy tape 400 can be wrapped in a concentric manner (not shown in FIG. 3).
- the composite epoxy tape 400 can comprise, for example, fiberglass, thermoplastic or a resin based tape.
- embodiments of the present invention are not limited to repairing straight sections of HDEP pipe and can be applied to more complex pipe geometries.
- FIG.7 shows a bent HDPE pipe as repaired using a pipe repair system of the present invention.
- a system for repairing a damaged HDEP pipe according to the present invention can be applied to a coupler of an HDPE pipe.
- FIG. 8 shows a reinforcement tape 805 with a hexagonal interlocking pattern, wrapped around the repaired HDPE pipe 100.
- the hexagonal reinforcement tape 805 can be applied circumferentially or longitudinally to the repaired HDPE pipe 100 and provide lateral or longitudinal reinforcement without requiring overlap of the tape windings.
- the interlocking pattern may be of a different shape, such as another polygonal shape, and may have teeth (not shown) that substantially penetrate the surface of the repaired HDPE pipe 100.
- a penetration depth from the surface should be preferably less than 10% of the repaired HDPE pipe wall thickness.
- FIG. 9 shows the front view of another example of interlocking reinforcing tape 900.
- the interlocking reinforcing tape 900 has a longitudinal ridge 905 and teeth 910.
- the interlocking reinforcing tape 900 is a steel band, but alternatively could comprise another metal or a composite construction.
- the teeth 910 may be indentations or perforations in the tape.
- the teeth 910 substantially penetrate the repaired HDPE pipe, preferably by less than 10% of the repaired HDPE pipe wall thickness.
- FIG. 10 shows a side view of the interlocking reinforcing tape 900, where a longitudinal groove 1005 is positioned opposite to the longitudinal ridge 905, on the other side of the interlocking reinforcing tape 900.
- This arrangement allows for two consecutive windings of the interlocking reinforcing tape 900 to be fastened to each other when the longitudinal ridge 905 embeds in the longitudinal groove 1005.
- Both the longitudinal groove 905 and the teeth 910 enable locking the tape 900 to an adjacent interlocking reinforcing tape 900 winding and onto the repaired HDPE pipe.
- Such an embodiment provides a system that can be robustly tensioned for full lateral and longitudinal reinforcement of the repaired HDPE pipe.
- the interlocking reinforcing tape 900 slides on the tape on the overlapping section during application and tensioning, whereas in the non-overlapping section the teeth 910 will grip and pull into the surface of the pipe 100.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Pipe Accessories (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU2022333542A AU2022333542A1 (en) | 2021-08-25 | 2022-08-25 | Pipe repair system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2021221595 | 2021-08-25 | ||
AU2021221595A AU2021221595A1 (en) | 2021-08-25 | 2021-08-25 | Pipe repair system |
Publications (1)
Publication Number | Publication Date |
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WO2023023799A1 true WO2023023799A1 (en) | 2023-03-02 |
Family
ID=85322211
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/AU2022/051027 WO2023023799A1 (en) | 2021-08-25 | 2022-08-25 | Pipe repair system |
Country Status (2)
Country | Link |
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AU (2) | AU2021221595A1 (en) |
WO (1) | WO2023023799A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004061743A1 (en) * | 2004-12-22 | 2006-07-06 | Fibre Optics Ct Gmbh | Holes and cracks sealing method and material for uncut cables and pipes, has sealing material selected from self adhesive, chemical and temperature resistance sealing band, central roll spring and other roll spring |
US20110203694A1 (en) * | 2008-02-08 | 2011-08-25 | Brooks Carl M | Repair system and method |
US20110284115A1 (en) * | 2010-05-21 | 2011-11-24 | Pipestream B.V. | Methods for Repairing a Defective Pipeline |
US20150204476A1 (en) * | 2014-01-23 | 2015-07-23 | Neptune Research, Inc. | Unidirectional fiber composite system for structural repairs and reinforcement |
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2021
- 2021-08-25 AU AU2021221595A patent/AU2021221595A1/en active Pending
-
2022
- 2022-08-25 WO PCT/AU2022/051027 patent/WO2023023799A1/en active Application Filing
- 2022-08-25 AU AU2022333542A patent/AU2022333542A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004061743A1 (en) * | 2004-12-22 | 2006-07-06 | Fibre Optics Ct Gmbh | Holes and cracks sealing method and material for uncut cables and pipes, has sealing material selected from self adhesive, chemical and temperature resistance sealing band, central roll spring and other roll spring |
US20110203694A1 (en) * | 2008-02-08 | 2011-08-25 | Brooks Carl M | Repair system and method |
US20110284115A1 (en) * | 2010-05-21 | 2011-11-24 | Pipestream B.V. | Methods for Repairing a Defective Pipeline |
US20150204476A1 (en) * | 2014-01-23 | 2015-07-23 | Neptune Research, Inc. | Unidirectional fiber composite system for structural repairs and reinforcement |
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