CA2166840A1 - Method of connecting fiberglass-reinforced plastic pipes - Google Patents
Method of connecting fiberglass-reinforced plastic pipesInfo
- Publication number
- CA2166840A1 CA2166840A1 CA 2166840 CA2166840A CA2166840A1 CA 2166840 A1 CA2166840 A1 CA 2166840A1 CA 2166840 CA2166840 CA 2166840 CA 2166840 A CA2166840 A CA 2166840A CA 2166840 A1 CA2166840 A1 CA 2166840A1
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- male
- female
- female pipe
- pipes
- 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
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000011152 fibreglass Substances 0.000 title claims abstract description 19
- 239000004744 fabric Substances 0.000 claims abstract description 18
- 239000011347 resin Substances 0.000 claims abstract description 11
- 229920005989 resin Polymers 0.000 claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims description 12
- 230000001070 adhesive effect Effects 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 description 4
- MPDDTAJMJCESGV-CTUHWIOQSA-M (3r,5r)-7-[2-(4-fluorophenyl)-5-[methyl-[(1r)-1-phenylethyl]carbamoyl]-4-propan-2-ylpyrazol-3-yl]-3,5-dihydroxyheptanoate Chemical compound C1([C@@H](C)N(C)C(=O)C2=NN(C(CC[C@@H](O)C[C@@H](O)CC([O-])=O)=C2C(C)C)C=2C=CC(F)=CC=2)=CC=CC=C1 MPDDTAJMJCESGV-CTUHWIOQSA-M 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- IHPYMWDTONKSCO-UHFFFAOYSA-N 2,2'-piperazine-1,4-diylbisethanesulfonic acid Chemical compound OS(=O)(=O)CCN1CCN(CCS(O)(=O)=O)CC1 IHPYMWDTONKSCO-UHFFFAOYSA-N 0.000 description 1
- 239000007990 PIPES buffer Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
A method of joining female and male fiberglass-reinforced plastic pipes, the female pipe having an end portion with an inner surface defining a non-threaded socket, the male pipe having an end portion, the method comprising the steps of (a) inserting the end portion of the male pipe into the socket of the female pipe, (b) wrapping a UV-curable resin-impregnated cloth around a portion of the female pipe adjacent the end thereof and around a portion of the male pipe, and (c) thereafter exposing the cloth to UV light to cure the resin and provide a sealed joint between the pipes.
Description
æl~ss4~
METHOD OF CONNECTING FIBERGLASS-REINFORCED PLASTIC PIPES
BACKGROUND OF THE INVENTION
The invention relates to fiberglass-reinforced plastic (FRP) pipes, and more particularly to methods of connecting such pipes.
There are many known methods for conecting FRP pipes end-to-end.
One method is to thread the end of one pipe into the end of the other. It is common to use an adhesive or sealant between the threads. Another method is a socket joint, which is formed by inserting the unthreaded end of one pipe into an unthreaded socket in the end of the other pipe, usually with an adhesive between the pipe ends. Another method is a butt joint, in which the ends of two pipes butt up against each other. In one variation of a butt joint, the outer surfaces of the pipes are ground down to form a 'scarfed area' around the joint, thereby exposing the fibers of the pipes, and the 'scarfed area' is overwrapped with a heat-curable, resin-impregnated fiber glass. In another variation of the butt joint, an irradiated polyethylene tape is wrapped around the joint, and a glass cloth sheet impregnated with thermosetting resin is wrapped around the polyethylene tape and then exposed to heat to cure the resin. See U.S. Patent No. 3,235,289.
668~
SUMMARY OF THE INVENTION
The invention provides an improved method for joining FRP pipes and ys utilizing a socket joint. As used herein, "fittings" include couplings, elbows, tees, etc., and "pipes" include both pipes, as they are commonly known, and fittings. Prior to the invention, socket joints were -sometimes not used to connect FRP pipes because of difficulties in sealing the joint and in providing mechanical strength. The invention solves this problem.
More particularly, the invention provides a method of joining two FRP pipes, one pipe (the female pipe) having an end portion with an inner surface defining a non-threaded socket. Preferably, the socket is also tapered, and the other pipe (the male pipe) has an end portion with a generally cylindrical, untapered, non-threaded outer surface. The end portion of the male pipe is inserted into the socket of the female pipe.
Adhesive is preferably applied to either or both the outer surface of the male pipe and the inner surface of the female pipe prior to inserting the male pipe into the female pipe. Next, a UV-curable resin-impregnated cloth is wrapped around both pipes adjacent the joint. The cloth is preferably made of fiberglass and UV-curable resin. If desired, prior to 21 6~84~
wla,u~ g the cloth around the pipes, a fillet compound can be applied between the end of the female pipe and the outer surface of the male pipe to provide a smooth transition between the outer surfaces of the pipes.
Finally, the cloth is exposed to UV light to cure the resin and provide a strong sealed joint between the pipes.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is an exploded view, partially in section, of the ends of male and female FRP pipes prior to connection according to the invention.
Fig. 2 shows the male pipe inserted into the female pipe with adhesive between the pipes.
Fig. 3 shows the pipes connected as in Fig. 2 and further with a fillet compound and a UV-curable overwrap.
Before one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of the construction and the arrangements of components set forth - 2~68~
in the following des~;,iplion or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of desc,i,ulion and should not be regarded as limiting.
2~i6~84~
DESCRIPTION OF THE PREFERRED EMBODIMENT
Fig. 1 illustrates female and male pipes, 10 and 14, respectively.
The pipes are made of fiberglass-reinforced plastic, as is known in the art. The female pipe 10 has an outer surface 18, a generally planar end 22, and an end portion 26 with an inner surface 30 defining a non-threaded, tapered socket 34. It should be understood that the socket 34 could also be straight. The male pipe 14 has an end portion 38 with a generally cylindrical, untapered, non-threaded outer surface 42. It should be understood that the outer surface 42 could also be tapered.
Fig. 2 illustrates the initial steps in connecting the pipes according to the invention. Preferably, the outer surfaces 18 and 42 of the pipes 10 and 14 are first prepared by sanding or other suitable means. An adhesive 46 is then applied to at least one of the pipe surfaces, the outer surface 42 of the male pipe 14 and/or the inner surface 30 of the female pipe 10.
Any suitable adhesive can be employed. Next, the end portion 38 of the male pipe 14 is inserted into the socket 34 of the female pipe 10, as shown in Fig. 2, so that the adhesive 46 substantially fills the space between the inner surface 30 of the female pipe 10 and the outer surface 42 of the male pipe 14.
21~6$ ~
After the male pipe 14 is inserted into the socket 34 of the female pipe 10, a fillet compound 50 (see Fig. 3) is placed between the end 22 of the female pipe 10 and the outer surface 42 of the male pipe 14 to provide a smooth transition between the outer surface 18 of the female pipe 10 and the outer surface 42 of the male pipe 14. Any suitable fillet compound can be employed. Next, as shown in Fig. 3, a UV-curable resin-impregnated cloth 54 is wrapped around the end portion 26 of the female pipe 10, around the fillet compound 50, and around a portion of the male pipe 14 adjacent the fillet compound 50. The resin-impregnated cloth 54 is preferably made of fiberglass and UV-curable resin. A suitable resin-impregnated cloth is manufactured by SUN REZ Corp. Finally, the resin-impregnated cloth 54 is exposed to UV light to cure the resin and provide a sealed joint between the pipes. Any suitable source of UV light (not shown) can be employed.
This method of joining FRP pipes allows the use of a simple socket joint while providing a good seal and a stronger joint between the pipes.
Because the UV-cured overwrap 54 provides increased joint strength, the adhesive 46 can be formulated for maximum chemical resistance and/or maximum thermal ability as opposed to strength.
8~
Various features of the invention are set forth in the following claims.
METHOD OF CONNECTING FIBERGLASS-REINFORCED PLASTIC PIPES
BACKGROUND OF THE INVENTION
The invention relates to fiberglass-reinforced plastic (FRP) pipes, and more particularly to methods of connecting such pipes.
There are many known methods for conecting FRP pipes end-to-end.
One method is to thread the end of one pipe into the end of the other. It is common to use an adhesive or sealant between the threads. Another method is a socket joint, which is formed by inserting the unthreaded end of one pipe into an unthreaded socket in the end of the other pipe, usually with an adhesive between the pipe ends. Another method is a butt joint, in which the ends of two pipes butt up against each other. In one variation of a butt joint, the outer surfaces of the pipes are ground down to form a 'scarfed area' around the joint, thereby exposing the fibers of the pipes, and the 'scarfed area' is overwrapped with a heat-curable, resin-impregnated fiber glass. In another variation of the butt joint, an irradiated polyethylene tape is wrapped around the joint, and a glass cloth sheet impregnated with thermosetting resin is wrapped around the polyethylene tape and then exposed to heat to cure the resin. See U.S. Patent No. 3,235,289.
668~
SUMMARY OF THE INVENTION
The invention provides an improved method for joining FRP pipes and ys utilizing a socket joint. As used herein, "fittings" include couplings, elbows, tees, etc., and "pipes" include both pipes, as they are commonly known, and fittings. Prior to the invention, socket joints were -sometimes not used to connect FRP pipes because of difficulties in sealing the joint and in providing mechanical strength. The invention solves this problem.
More particularly, the invention provides a method of joining two FRP pipes, one pipe (the female pipe) having an end portion with an inner surface defining a non-threaded socket. Preferably, the socket is also tapered, and the other pipe (the male pipe) has an end portion with a generally cylindrical, untapered, non-threaded outer surface. The end portion of the male pipe is inserted into the socket of the female pipe.
Adhesive is preferably applied to either or both the outer surface of the male pipe and the inner surface of the female pipe prior to inserting the male pipe into the female pipe. Next, a UV-curable resin-impregnated cloth is wrapped around both pipes adjacent the joint. The cloth is preferably made of fiberglass and UV-curable resin. If desired, prior to 21 6~84~
wla,u~ g the cloth around the pipes, a fillet compound can be applied between the end of the female pipe and the outer surface of the male pipe to provide a smooth transition between the outer surfaces of the pipes.
Finally, the cloth is exposed to UV light to cure the resin and provide a strong sealed joint between the pipes.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is an exploded view, partially in section, of the ends of male and female FRP pipes prior to connection according to the invention.
Fig. 2 shows the male pipe inserted into the female pipe with adhesive between the pipes.
Fig. 3 shows the pipes connected as in Fig. 2 and further with a fillet compound and a UV-curable overwrap.
Before one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of the construction and the arrangements of components set forth - 2~68~
in the following des~;,iplion or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of desc,i,ulion and should not be regarded as limiting.
2~i6~84~
DESCRIPTION OF THE PREFERRED EMBODIMENT
Fig. 1 illustrates female and male pipes, 10 and 14, respectively.
The pipes are made of fiberglass-reinforced plastic, as is known in the art. The female pipe 10 has an outer surface 18, a generally planar end 22, and an end portion 26 with an inner surface 30 defining a non-threaded, tapered socket 34. It should be understood that the socket 34 could also be straight. The male pipe 14 has an end portion 38 with a generally cylindrical, untapered, non-threaded outer surface 42. It should be understood that the outer surface 42 could also be tapered.
Fig. 2 illustrates the initial steps in connecting the pipes according to the invention. Preferably, the outer surfaces 18 and 42 of the pipes 10 and 14 are first prepared by sanding or other suitable means. An adhesive 46 is then applied to at least one of the pipe surfaces, the outer surface 42 of the male pipe 14 and/or the inner surface 30 of the female pipe 10.
Any suitable adhesive can be employed. Next, the end portion 38 of the male pipe 14 is inserted into the socket 34 of the female pipe 10, as shown in Fig. 2, so that the adhesive 46 substantially fills the space between the inner surface 30 of the female pipe 10 and the outer surface 42 of the male pipe 14.
21~6$ ~
After the male pipe 14 is inserted into the socket 34 of the female pipe 10, a fillet compound 50 (see Fig. 3) is placed between the end 22 of the female pipe 10 and the outer surface 42 of the male pipe 14 to provide a smooth transition between the outer surface 18 of the female pipe 10 and the outer surface 42 of the male pipe 14. Any suitable fillet compound can be employed. Next, as shown in Fig. 3, a UV-curable resin-impregnated cloth 54 is wrapped around the end portion 26 of the female pipe 10, around the fillet compound 50, and around a portion of the male pipe 14 adjacent the fillet compound 50. The resin-impregnated cloth 54 is preferably made of fiberglass and UV-curable resin. A suitable resin-impregnated cloth is manufactured by SUN REZ Corp. Finally, the resin-impregnated cloth 54 is exposed to UV light to cure the resin and provide a sealed joint between the pipes. Any suitable source of UV light (not shown) can be employed.
This method of joining FRP pipes allows the use of a simple socket joint while providing a good seal and a stronger joint between the pipes.
Because the UV-cured overwrap 54 provides increased joint strength, the adhesive 46 can be formulated for maximum chemical resistance and/or maximum thermal ability as opposed to strength.
8~
Various features of the invention are set forth in the following claims.
Claims (5)
1. A method of joining female and male fiberglass-reinforced plastic pipes, the female pipe having an end portion with an inner surface defining a non-threaded socket, the male pipe having an end portion, said method comprising the steps of (a) inserting the end portion of the male pipe in the socket of the female pipe, (b) wrapping a UV-curable resin-impregnated cloth around a portion of the female pipe adjacent the end thereof and around a portion of the male pipe, and (c) thereafter exposing the cloth to UV light to cure the resin and provide a sealed joint between the pipes.
2. A method as set forth in Claim 1 wherein the male pipe has an outer surface, and wherein said method further comprises the step of, prior to step (a), applying an adhesive to at least one of the outer surface of the male pipe and the inner surface of the female pipe so that the adhesive substantially fills the space between the inner surface of the female pipe and the outer surface of the male pipe when the male pipe is inserted into the female pipe.
3. A method as set forth in Claim 1 wherein the female pipe has an end and an outer surface, and wherein said method further comprises the step of, prior to step (b), placing a fillet compound between the end of the female pipe and the outer surface of the male pipe to provide a smooth transition between the outer surface of the female pipe and the outer surface of the male pipe, and wherein the cloth is wrapped around the fillet compound.
4. A method as set forth in Claim 1 wherein the cloth is made of fiberglass and UV-curable resin.
5. A method of joining female and male fiberglass-reinforced plastic pipes, the female pipe having an outer surface, an end, and an end portion with an inner surface defining a non-threaded socket, the male pipe having an end portion with a generally cylindrical, non-threaded outer surface, said method comprising the steps of applying an adhesive to at least one of the outer surface of the male pipe and the inner surface of the female pipe, inserting the end portion of the male pipe into the socket of the female pipe so that the adhesive substantially fills the space between the inner surface of the female pipe and the outer surface of the male pipe, placing a fillet compound between the end of the female pipe and the outer surface of the male pipe to provide a smooth transition between the outer surface of the female pipe and the outer surface of the male pipe, wrapping a resin-impregnated cloth around a portion of the female pipe adjacent the end thereof, around the fillet compound, and around a portion of the male pipe adjacent the fillet compound, the cloth being made of fiberglass and UV-curable resin, and thereafter exposing the cloth to UV light to cure the resin and provide a sealed joint between the pipes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US38138695A | 1995-01-31 | 1995-01-31 | |
| US08/381,386 | 1995-01-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2166840A1 true CA2166840A1 (en) | 1996-08-01 |
Family
ID=23504835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2166840 Abandoned CA2166840A1 (en) | 1995-01-31 | 1996-01-09 | Method of connecting fiberglass-reinforced plastic pipes |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2166840A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105135132A (en) * | 2015-08-08 | 2015-12-09 | 浙江三方管业有限公司 | Polyethylene pipeline with connecting port capable of being rapidly sealed |
| CN108548018A (en) * | 2018-04-30 | 2018-09-18 | 上海英泰塑胶股份有限公司 | Three step port high-pressure pipe member of continuous fiber reinforced thermoplastic concave |
-
1996
- 1996-01-09 CA CA 2166840 patent/CA2166840A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105135132A (en) * | 2015-08-08 | 2015-12-09 | 浙江三方管业有限公司 | Polyethylene pipeline with connecting port capable of being rapidly sealed |
| CN105135132B (en) * | 2015-08-08 | 2018-08-24 | 杭州道盈信息科技有限公司 | Polyethylene pipe with fast sealing connectivity port |
| CN108548018A (en) * | 2018-04-30 | 2018-09-18 | 上海英泰塑胶股份有限公司 | Three step port high-pressure pipe member of continuous fiber reinforced thermoplastic concave |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |