WO1996009487B1 - A double containment pipe coupling assembly, system and method - Google Patents

A double containment pipe coupling assembly, system and method

Info

Publication number
WO1996009487B1
WO1996009487B1 PCT/US1995/011644 US9511644W WO9609487B1 WO 1996009487 B1 WO1996009487 B1 WO 1996009487B1 US 9511644 W US9511644 W US 9511644W WO 9609487 B1 WO9609487 B1 WO 9609487B1
Authority
WO
WIPO (PCT)
Prior art keywords
coupling
tubular member
assembly
transition
fluid
Prior art date
Application number
PCT/US1995/011644
Other languages
French (fr)
Other versions
WO1996009487A3 (en
WO1996009487A2 (en
Filing date
Publication date
Priority claimed from US08/320,665 external-priority patent/US5713607A/en
Application filed filed Critical
Priority to DE69525523T priority Critical patent/DE69525523T2/en
Priority to CZ19961412A priority patent/CZ294252B6/en
Priority to AU36316/95A priority patent/AU696049B2/en
Priority to JP8510970A priority patent/JPH09505876A/en
Priority to EP95933798A priority patent/EP0731893B1/en
Priority to AT95933798T priority patent/ATE213530T1/en
Priority to CA002176464A priority patent/CA2176464C/en
Publication of WO1996009487A2 publication Critical patent/WO1996009487A2/en
Publication of WO1996009487A3 publication Critical patent/WO1996009487A3/en
Publication of WO1996009487B1 publication Critical patent/WO1996009487B1/en

Links

Abstract

A pipe coupling assembly for use with at least one terminal end of a fluid transfer pipe (Ps) having an inner tubular member (Pi) for transferring fluid, an outer tubular member (Po), and an interstitial space (Si) therebetween. The pipe coupling assembly comprises a transition coupling (Ct) for attachment to the pipe (Ps) to provide a first path for the transfer fluid in the inner tubular member (Po) and a second path (62) for the transfer pipe's interstitial space (Si), and a transition fitting (Ft) for attachment to the transition coupling (Ct) to provide separate access to the transfer fluid and the transfer pipe's interstitial space (Pi).

Claims

AMENDED CLAIMS
[received by the International Bureau on 6 May 1996 (06.05.96);
original claims 2, 20, 62, 63 and 80 cancelled; original claims 1, 19, 34, 61, 76, 78, 79, 92 and 113 amended;
new claim 125 added; remaining claims unchanged (19 pages)]
1. A pipe coupling assembly for use with at least one terminal end of a fluid transfer pipe having an inner tubular member for transferring fluid, an outer tubular member.
and an interstitial space therebetween, comprising:
a transition coupling for attachment to the pipe to provide a first path for fluid in the inner tubular member and a second path for the interstitial space;
a transition fitting for attachment to said transition coupling to provide
separate access to the fluid and the interstitial space,
wherein said transition coupling comprises a ferrule, an insert, and a coupling means, said ferrule having means for attachment to said outer tubular member at its terminal end. said ferrule having an outer annular flange and a passageway for alignment with said interstitial space,
said insert having means for attachment to said inner tubular member at its terminal end and comprising an inner annular flange to cooperate with said outer angular flange to define a circumferentially extending chamber,
said coupling means attached to said ferrule for coupling engagement with said transition fitting. 3. The assembly of Claim 2 wherein said transition fitting comprises a channel aligned for engagement with said chamber, and seal pockets having O-ring seals therein for sealing engagement with said outer and inner annular flanges.
4 The assembly of Claim 3 wherein said insert means comprises metal and said ferrule means and said transition fitting are nondegradable plastic, said insert means contained within said ferrule means to prevent exposure of said metal insert means when said assembly is in said coupling engagement.
5. The assembly of Claim 4 wherein said nondegradable plastic is selected from the group consisting of nylon polyethylene, and glass fiber filled plastic composite.
6. The assembly of Claim 4 wherein said metal insert can be expanded into said inner tubular member. 7 The assembly of Claim 3 wherein said coupling means comprises a
nondegradable plastic swivel nut and said transition fitting comprises threads for coupling engagement with said nut.
8. The assembly of Claim 3 wherein said seal pockets each include an O-ring, and said outer and inner annular flanges have sufficient length to extend into said seal pockets for sealing engagement with said O-rings.
9. The assembly of Claim 3 wherein said means for attachment on said ferrule is teeth means formed in said ferrule for deformational engagement with said outer tubular member.
10. The assembly of Claim 3 wherein said insert is attached to said inner tubular member using teeth means formed in said insert means for deformational engagement with said inner tubular member upon expansion of said insert means
11. The assembly of Claim 3 further comprises back-off restrictor means for engaging said coupling means to prevent movement of said coupling means due to vibration
12 The assembly of Claim 1 wherein said transition fitting comprises means for coupling to additional structure.
13. The assembly of Claim 12, wherein said means for coupling to additional structure comprises a tee fitting having three ends with transition fittings on at least two ends thereof.
14. The assembly of Claim 13 wherein said third end of said tee fitting is adapted to receive a threaded riser pipe. 15. The assembly of Claim 13 wherein said third end of said tee fitting comprises a transition fitting.
16. The assembly of Claim 12 wherein said means for coupling to additional structure is selected from an elbow fitting, a tee fitting, a riser adapter, a shear valve adapter, a male adapter and a female adapter.
17. The assembly of Claim 1 wherein said transition fitting comprises a first channel forming a pass-through channel for alignment along said axial direction of said transfer pipe
18. The assembly of Claim 17 wherein said transition fitting further comprises a second channel forming a directional channel for alignment in a direction other than said axial direction. 19 A pipe assembly comprising:
a pipe for transferring fluid having an inner tubular member for transferring fluid, an outer tubular member, and an interstitial space therebetween;
a transition coupling for attachment to said pipe to provide a first path for fluid in said inner tubular member and a second path for said interstitial space; and
a transition fitting for attachment to said transition coupling to provide access to said fluid and said interstitial space,
wherein said transition coupling comprises ferrule means, insert means, and coupling means,
said ferrule means attached to said outer tubular member at its terminal end and comprising an outer annular flange and a passageway aligned with said interstitial space, said insert means attached to said inner tubular member at its terminal end and having an inner annular flange to cooperate with said outer annular flange to define a
circumferentially extending chamber.
said coupling means attached to said ferrule means for coupling engagement with said transition fitting.
21. The coupling assembly of Claim 19 wherein said transition fitting comprises a channel aligned for engagement with said chamber and seal pockets for sealing engagement with said outer and inner flanges.
22. The assembly of Claim 21 wherein said insert means comprises metal and said ferrule means and said transition fitting comprise nondegradable plastic,
said insert means contained within said ferrule means to prevent exposure of said insert means when said assembly is in said coupling engagement.
23. The assembly of Claim 22 wherein said nondegradable plastic is selected from the group consisting of nylon, glass fiber filled plastic composite, and polyethylene. 24. The assembly of Claim 22 wherein said metal insert means can be expanded into said inner tubular member.
25. The assembly of Claim 21 wherein said coupling means is a nondegradable plastic swivel nut, and said transition fitting comprises threads for coupling engagement with said nut.
26. The assembly of Claim 21 wherein said seal pockets each comprise an O-ring, and said outer and inner flanges extend into said seal pockets for sealing engagement with said O-rings.
27. The assembly of Claim 21 wherein said ferrule means is attached to said outer tubular member using teeth means formed in said ferrule means for deformational engagement with said outer tubular member
28. The assembly of Claim 21 wherein said insert means is attached to said inner tubular member using teeth means formed in said insert means for deformational engagement with said inner tubular member upon expansion of said insert means. 29. The assembly of Claim 21 which further comprises back-off restrictor means for engaging said coupling means to prevent radial movement of said coupling means due to vibration.
30. The assembly of Claims 19 wherein said transition fitting comprises means for coupling to additional structure
31. The assembly of Claim 30 wherein said means for coupling to additional structure comprises a tee fitting having three ends with transition fittings on at least two ends thereof.
32. The assembly of Claim 31 wherein said third end of said tee fitting is adapted to receive a threaded riser pipe.
33 The assembly of Claim 31 wherein said third end of said tee fitting further comprises a transition fitting.
34. The assembly of Claim 30 wherein said coupling means including means for engaging said additional structure is selected from an elbow fitting, a tee fitting, a riser adapter, a shear valve adapter, a male adapter and a female adapter.
35. The assembly of Claim 19 wherein said transition fitting comprises a first interstitial channel forming a pass-through channel aligned along said axial direction of said transfer pipe.
36. The assembly of Claim 35 further comprising a second channel forming a directional channel aligned in a direction other than said axial direction.
37. A pipe system for distributing fluids, comprising:
a supply tank;
pump means for transferring fluid from said supply tank;
at least one dispensing means for dispensing said fluid;
a plurality of pipe segments connecting said pump means to said dispensing means, said pipe segments having an inner tubular member for transferring said fluid, an outer tubular member, and an interstitial space therebetween, and
means for connecting said pipe segments to provide a first path for fluid in said inner tubular member and a second path for said interstitial space.
38. A pipe system of Claim 37 wherein said means for connecting said pipe segments comprises:
a transition coupling for attachment to said pipe segments to provide a first path for fluid in said inner tubular member and a second path for said interstitial space; and a transition fitting for attachment to said transition coupling to provide separate access to said fluid and said interstitial space.
39. The pipe system of Claim 38 wherein said transition coupling comprises ferrule means, insert means, and coupling means.
said ferrule means attached to said outer tubular member at its terminal end and having an outer annular flange and a passageway aligned with said interstitial space, said insert means attached to said inner tubular member at its terminal end and having an inner annular flange to cooperate with said outer annular flange to define a circumferentially extending chamber, and
said coupling means attached to said ferrule means for coupling engagement with said transition fitting.
40. The pipe system of Claim 39 wherein said transition fitting comprises a channel aligned for engagement with said chamber, and seal pockets for sealing engagement with said outer and inner flanges.
41. The system of Claim 40 wherein said insert means comprises metal and said ferrule means and said transition fitting comprise nondegradable plastic, and
said insert means contained within said ferrule means to prevent exposure of said insert means when said assembly is in said coupling engagement.
42. The system of Claim 41 wherein said nondegradable plastic is selected from the group consisting of nylon, polyethylene and glass fiber filled plastic composite.
43. The system of Claim 41 wherein said metal insert means is internally expanded into said inner tubular member
44. The system of Claim 40 wherein said coupling means is a nondegradable plastic swivel nut. and said transition fitting comprises threads for coupling engagement with said nut.
45. The system of Claim 40 wherein said seal pockets each comprise an O-ring, and said outer and inner annular flanges extend into said seal pockets for sealing engagement with said O-rings.
46. The system of Claim 40 wherein said ferrule means is attached to said outer tubular member using teeth means formed in said ferrule means for deformational engagement with said outer tubular member. 47. The system of Claim 40 wherein said insert means is attached to said inner tubular member using teeth means formed in said insert means for deformational engagement with said inner tubular member upon expansion of said insert means.
48. The system of Claim 40 further comprising back-off restrictor means for engaging said coupling means to prevent movement of said coupling means due to vibration.
49 The system of Claim 38 wherein said transition fitting comprises means for coupling to additional structure. S0. The system of Claim 49 wherein said means for coupling to additional structure comprises a tee fitting having three ends with transition fittings on at least two ends thereof.
51. The system of Claim 50 wherein said third end of said tee fitting is adapted to receive a threaded riser pipe.
52. The system of Claim 50 wherein said third end of said tee fitting comprises a transition fitting. 53. The system of Claim 49 wherein said means for coupling to said additional structure is selected from an elbow fitting, a tee fitting, a riser adapter, a shear valve adapter, a male adapter and a female adapter.
54. The system of Claim 38 wherein said transition fitting comprises a first channel forming a pass-through channel aligned along said axial direction of said transfer pipe
55. The system of Claim 54 wherein said transition fitting further comprises a second channel forming a directional channel aligned in a direction other than said axial direction.
56. The system of Claim 37 wherein said second space path is a closed path interconnecting all interstitial space in said system. 57. The system of Claim 37 further comprising means for providing fluid access to said second space path.
58. The system of Claim 37 further comprising means for providing gas pressure to said interstitial space to enable said system to be tested to measure integrity of said fittings and existence o f leaks .
59. The system of Claim 37 further comprising means for providing a vacuum to said interstitial space to enable said system to be tested to measure integrity of said fittings and existence of leaks.
60. The system of Claim 37 further comprising means to fill said second path with liquid and means for monitoring level of said liquid, whereby presence of a leak in any of said tubular members can be detected. 61 A method for distributing fluid comprising:
withdrawing fluid from a supply tank,
transferring said fluid from said supply tank through a
plurality of pipe segments to at least one dispensing means for dispensing said fluid,
said pipe segments having an inner tubular member for transferring said fluid, an outer tubular member, and an interstitial space therebetween;
said pipe segments connected by means for connecting said pipe segments to provide a first continuous path for fluid in said inner tubular member and a second continuous, closed path for said interstitial space,
wherein said means for connecting said pipe segments comprises a transition coupling for attachment to said pipe segments to provide a first path for fluid in said inner tubular member and a second path for said interstitial space, and
a transition fitting for attachment to said transition coupling to provide access to the fluid and said interstitial space wherein said transition coupling comprises ferrule means, insert means, and coupling means, said ferrule means attached to said outer tubular member at its terminal end and having an outer annular flange and a passageway aligned with said interstitial space,
said insert means attached to said inner tubular member at its terminal end and having an inner annular flange to cooperate with said outer annular flange to define a
circumferentially extending chamber, and
said coupling means attached to said ferrule means for coupling engagement with said transition fitting
64. The method of Claim 61 wherein said second space path is connected to form a closed path interconnecting all interstitial space in said system.
65. The method of Claim 61 further comprising providing fluid access to said second space path. 66. The method of Claim 61 further comprising pro siding gas pressure to said interstitial space to measure integrity of said fittings and existence of leaks.
67 The method of Claim 61 further comprising providing a vacuum to said interstitial space to measure integrity of said fittings and existence of leaks
68. The method of Claim 61 comprising filling said second path with liquid, and monitoring the level of said liquid whereby presence of a leak in any of said tubular members is detected.
69. A pipe system for distributing fluids, comprising:
a supply tank;
pump means for transferring fluids from said supply tank;
at least one dispensing means for dispensing the fluid;
a plurality of pipe segments connecting said pump means to said dispensing means, said pipe segments having an inner tubular member for transferring the fluid, an outer tubular member, and an interstitial space therebetween;
means for connecting said pipe segments to provide a first path for fluid in said inner tubular member and a second path for said interstitial space;
means for providing a vacuum to said interstitial space; and
control means for employing said vacuum to test said interstitial space for leaks.
70.The system of Claim 69 which further comprises means for closing said system to preserve said vacuum therein and timing means for measuring the time that said vacuum is maintained below a predetermined value,
said timing means comprising alarm means for providing a signal in response to the length of time measured by said timing means.
71 .The system of Claim 69 which comprises timing means for measuring the time required to reach a predetermined level of vacuum and alarm means for providing a signal representative of the time lapsed prior to reaching said predetermined level.
72.The system of Claim 71 which further comprises shut off means for closing the system to preserve the vacuum therein and wherein said timing means comprises means to measure the time said vacuum is maintained below a predetermined value, said timing means further comprising alarm means for providing a signal representative of the length of time measured by said timing means. 73 The system of Claim 69 further comprising liquid sensor means for determining presence of liquid in said system during said vacuum,
said liquid sensor comprising means for providing a signal responsive to presence of liquid in said interstitial space. 74. A method for distributing fluid comprising,
withdrawing fluid from a supply tank and transferring said fluid from said supply tank through a plurality of pipe segments to at least one dispensing means for dispensing the fluid; said pipe segments having an inner tubular member for transferring the fluid, an outer tubular member, and an interstitial space therebetween;
said pipe segments connected by means for connecting said pipe segments for providing a first continuous path for fluid in said inner tubular member and a second continuous, closed path for said interstitial space; and
providing a vacuum to said interstitial space to test said interstitial .space for leaks 75 The method of Claim 74 which further comprises the step of closing said system to preserve said vacuum therein,
measuring the time that said vacuum is maintained below a predetermined value, and providing a signal in response to the time measured 76.The method of Claim 74 which comprises measuring the time required to reached a predetermined level of vacuum and providing a signal representative of the tune lapsed prior to reaching said predetermined level.
77. The method of Claim 75 which further comprises closing the system to preserve the vacuum therein, measuring the time said vacuum is maintained below a predetermined value, and providing a signal representative of the time measured.
78.The method of Claim 74 which comprises determining the presence of liquid in said system during said vacuum with a liquid sensor and providing a signal responsive to the presence of liquid in said interstitial space.
79. A pipe coupling assembly for use with at least one terminal end of a fluid transfer pipe having an inner tubular member for transferring fluid, an outer tubular member, and art interstitial space therebetween, comprising:
a transition coupling for attachment to said pipe to provide a first path for fluid in said inner tubular member and a second path for said interstitial space, and
a transition fitting for attachment to said transition coupling to provide access to said fluid and said interstitial space,
said transition coupling comprising a ferrule, an insert, and a coupling means, said ferrule having means for attachment to said outer tubular member at its terminal end, at least one radial interstitial channel for alignment with said interstitial space,
said insert comprising means for attachment to said inner tubular member at its terminal end.
81. The coupling assembly of claim 79 wherein said coupling means can be attached to said ferrule for coupling engagement with said transition fitting, said transition fitting having a channel therein for alignment with said at least one interstitial channel in said ferrule. 82 The coupling assembly of claim 79 wherein said insert comprises stainless steel.
83. The coupling assembly of claim 79 wherein said ferrule and said transition fitting comprise nondegradable plastic.
84. The coupling assembly of claim 82 wherein said insert is contained within said ferrule to prevent exposure of said insert when said assembly is in said coupling engagement.
85. The coupling assembly of claim 83 wherein said nondegradable plastic is selected from the group consisting of nylon, polyethylene, and glass fiber filled plastic composite.
86. The coupling assembly of claim 79 said metal insert can be internally expanded into said inner tubular member. 87. The coupling assembly of claim 79 wherein said coupling means is a
nondegradable plastic swivel nut.
88. The coupling assembly of claim 79 wherein said transition fitting comprises threads for coupling engagement with said swivel nut.
89. The coupling assembly of claim 79 wherein said insert comprises channels for retaining O-ring seals for radial sealing engagement with said transition fitting
90. The coupling assembly of claim 79 wherein said ferrule comprises at least one channel for retaining O-ring seals for radial sealing engagement with said transition fitting.
91. The coupling assembly of claim 79 wherein said means for attachment on said ferrule is teeth means formed in said ferrule for deformational engagement with said outer tubular member
92. The coupling assembly of claim 79 wherein said insert is attached to said inner tubular member by teeth means formed in said insert for deformational engagement with said inner tubular member upon expansion of said insert.
93. The coupling assembly of claim 79 wherein said transition fitting comprises means for coupling to additional structure.
94. The coupling assembly of claim 93 wherein said means for coupling to additional structure comprising a tee fitting having three ends with transition fittings on at least two ends thereof.
95. The coupling assembly of claim 79 wherein said transition fitting comprises a first channel forming a pass-through channel for alignment along said axial direction of said transfer pψe.
96. The coupling assembly of claim 91 wherein said transition fitting comprises a second channel forming a directional channel for alignment in a direction other than said axial direction.
97. A transition coupling for connection to a coaxial pipe having an inner tubular member for transferring fluid, an outer tubular member, and an interstitial space therein, said coupling providing a first path for fluid in said inner tubular member and a second path for said interstitial space comprising, a ferrule, an insert, and a coupling means,
said ferrule having means for attachment to said outer tubular member at its terminal end. and at least one radial interstitial channel for alignment with said interstitial space.
9H. The coupling assembly of claim 97 wherein said insert comprises means for attachment to said inner tubular member
99. The coupling assembly of claim 97 wherein said coupling means can be attached to said ferrule for coupling engagement with said transition fitting, said
transition fitting having at least one channel therein for alignment with said at least one interstitial channel in .said ferrule
100. The coupling assembly of claim 99 wherein said insert comprises stainless steel. 101. The coupling assembly of claim 97 wherein said ferrule and said
transition fitting comprise nondegradable plastic.
102. The coupling assembly of claim 100 wherein said insert is contained within said ferrule to prevent exposure of said insert when said assembly is in said coupling engagement.
103. The coupling assembly of claim 101 wherein said nondegradable plastic is selected from the group consisting of nylon, polyethylene, and glass fiber filled plastic composite. 104. The coupling assembly of claim 97 wherein said insert can be internally expanded into said inner tubular member.
105. The coupling assembly of claim 97 wherein said coupling means is a swivel nut. 106. The coupling assembly of claim 97 wherein said transition fitting comprises threads for coupling engagement with said swivel nut.
107. The coupling assembly of claim 97 wherein said insert comprises at least one channel for retaining O-ring seals for providing radial sealing engagement with said transition fitting.
10R. The coupling assembly of claim 106 wherein said ferrule comprises at least one channel for retaining O-ring seals for providing radial sealing engagement with said transition fitting.
109. The coupling assembly of claim 97 wherein said means for attachment on said ferrule is teeth means formed in said ferrule for deformational engagement with said outer tubular member.
110. The coupling assembly of claim 98 wherein said insert is attached to said inner tubular member by teeth means formed in said insert for deformational engagement with said inner tubular member upon expansion of said insert. 111. A pipe coupling assembly for use with at least one terminal end of a fluid transfer pipe having an inner tubular member for transferring fluid, an outer tubular member, and an interstitial space therebetween, comprising:
a transition coupling for attachment to said transfer pipe to provide a first path for fluid in said inner tubular member and a second path for said interstitial space; and
a transition fitting for attachment to said transition coupling to provide access to said fluid and said interstitial space, said transition fitting having a first interior surface and an interior bore section, said interior bore section having an exterior surface and an interior surface for transport of fluid therethrough,
said bore section suspended from said first interior surface to provide interstitial channels between said first interior surface of said fitting and said exterior surface of said interior bore section.
112. The coupling assembly of claim 111 wherein said bore section is suspended from said interior surface of said fitting by connecting rib members.
113. The coupling assembly of claim 1 12 wherein said fitting comprises
nondegradable plastic selected from the group consisting of nylon, polyethylene, and glass fiber filled plastic composite.
114. The coupling assembly of claim 1 1 1 further comprising an insert for internal expansion into said inner tubular member.
115. The coupling assembly of claim 11 1 wherein said coupling means is a swivel nut.
1 16. The coupling assembly of claim 111 wherein said transition fitting further comprises threads for coupling engagement with said swivel nut.
117. The coupling assembly of claim 1 1 1 wherein said insert comprises at least one channel for retaining O-ring seals for radial sealing engagement with said transition fitting.
1 18. The coupling assembly of claim 11 1 wherein said means for attachment on said ferrule is teeth means formed in said ferrule for deformational engagement with said outer tubular member.
1 19. The coupling assembly of claim 114 wherein said insert comprises teeth means for deformational engagement with said inner tubular member upon expansion of said insert.
120. A transition fitting for attachment to a transition coupling for a coaxial pipe having an interstitial space therein,
said transition fitting having a first interior surface and an interior bore section, said interior bore section having an exterior surface and an interior surface for transport of fluid therethrough,
said bore section suspended from said interior surface to provide interstitial channels between said first interior surface of said fitting and said exterior surface of said bore section
121. The transition fitting of claim 120 wherein said bore section is suspended from said first interior surface by connecting rib members.
122. The transition fitting of claim 120 wherein said fitting comprises nondegradable plastic selected from the group consisting of nylon, polyethylene, and glass fiber filled plastic composite 123. The transition fitting of claim 120 wherein said transition fitting further comprises threads for coupling engagement with said swivel nut.
124. The transition fitting of claim 120 wherein said interstitial channels enable flow of interstitial fluid in both horizontal and vertical directions.
125. A method for distributing fluid comprising:
withdrawing fluid from a supply tank,
transferring said fluid from said supply tank through a
plurality of pipe segments to at least one dispensing means for dispensing said fluid.
said pipe segments having an inner tubular member for transferring said fluid, an outer tubular member, and an interstitial space therebetween;
said pipe segments connected by means for connecting said pipe segments to provide a first continuous path for fluid in said inner tubular member and a second continuous, closed path for said interstitial space,
wherein said means for connecting said pipe segments comprises a transition coupling for attachment to said pipe segments to provide a first path for fluid in said inner tubular member and a second path for said interstitial space, and
a transition fitting for attachment to said transition coupling to provide access to the fluid and said interstitial space wherein said transition coupling comprises ferrule means, insert means, and coupling means, said ferrule means attached to said outer tubular member at its terminal end and having an outer annular flange and a passageway aligned with said interstitial space, said coupling means attached to said ferrule means for coupling engagement with said transition fitting STATEMENT UNDER ARTICLE 19 ( 1 )
The amendments to claims 1 , 19, 34, 61 , 76, 78, 79, 92 and 113 clarify Applicant's claimed invention New claim 125 recites additional patentable aspects of Applicant's invention. In this connection, none of the references cited in the search report are believed to teach or suggest the presently claimed invention.
PCT/US1995/011644 1994-09-15 1995-09-15 A double containment pipe coupling assembly, system and method WO1996009487A2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE69525523T DE69525523T2 (en) 1994-09-15 1995-09-15 TUBE CLUTCH ASSEMBLY, SYSTEM AND METHOD
CZ19961412A CZ294252B6 (en) 1994-09-15 1995-09-15 Coupling assembly for connecting a dual-wall pipe
AU36316/95A AU696049B2 (en) 1994-09-15 1995-09-15 Pipe coupling assembly, system and method
JP8510970A JPH09505876A (en) 1994-09-15 1995-09-15 Pipe fitting assembly, system and method
EP95933798A EP0731893B1 (en) 1994-09-15 1995-09-15 Pipe coupling assembly, system and method
AT95933798T ATE213530T1 (en) 1994-09-15 1995-09-15 PIPE COUPLING ASSEMBLY, SYSTEM AND METHOD
CA002176464A CA2176464C (en) 1994-09-15 1995-09-15 Pipe coupling assembly, system and method

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US30668094A 1994-09-15 1994-09-15
US08/306,680 1994-09-15
US08/320,665 US5713607A (en) 1994-09-15 1994-10-11 Pipe coupling assembly, system and method
US08/320,665 1994-10-11
US38900495A 1995-02-15 1995-02-15
US08/389,004 1995-02-15

Publications (3)

Publication Number Publication Date
WO1996009487A2 WO1996009487A2 (en) 1996-03-28
WO1996009487A3 WO1996009487A3 (en) 1996-06-27
WO1996009487B1 true WO1996009487B1 (en) 1996-09-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/011644 WO1996009487A2 (en) 1994-09-15 1995-09-15 A double containment pipe coupling assembly, system and method

Country Status (10)

Country Link
US (2) US5831149A (en)
EP (1) EP0731893B1 (en)
JP (1) JPH09505876A (en)
AT (1) ATE213530T1 (en)
AU (1) AU696049B2 (en)
CA (1) CA2176464C (en)
CZ (1) CZ294252B6 (en)
HU (1) HUT77498A (en)
MX (1) MX9601833A (en)
WO (1) WO1996009487A2 (en)

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