US5141260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Force-transferring double-containment plastic pipe assembly
Assignee: FLUID CONTROLS Inc AN AL Corp
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Filing: 1991-02-04
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Granted: 1992-08-25
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Expires: 2011-02-04
Abstract
Abstract A double-containment thermoplastic pipe assembly provides for transfer of differential thermal expansion forces to rigid external supports. The assembly includes a flanged restraint coupling having an inner carrier pipe portion, an outer containment pipe portion, a wall connecting the inner and outer pipe portions, and a radially extending flange around the outside of the containment pipe portion. The flange is secured to an external support such as a manhole for underground system by being cast into the wall of a cast-in-place manhole or by being engaged by rings on each side of the flange for precast manhole systems. The outer pipe terminates at the manhole wall so that the containment function within the manhole is performed by the manhole inself. For above-ground applications, the coupling is secured by engagement of the flange with a cast concrete wall or metal saddle connected to an underground footing. Both containment and carrier pipes are connected to each end of the coupling for the latter applications. Rigid spacers are placed between the two pipes along its length to provide for controlled flexing of the carrier pipe upon undergoing thermal expansion. The invention is particularly useful for polyethylene pipes and for later diameter pipes.
Inventors
- 👤 E. Dudley Burwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:39
CPC Classifications
F; F16; F16L; F16L5/00; F16L5/02; F16L5/12; F16L5/14; F16L55/00; F16L55/16; F16L55/1604; F16L55/1608
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
128 words
A double-containment thermoplastic pipe assembly comprising: a double-containment pipe comprising an outer containment pipe and an inner carrier pipe disposed concentrically within the containment pipe; a restraint coupling having an inner carrier pipe portion connectable end to end to an end of said inner carrier pipe, an outer containment pipe portion connectable end to end to an end of said containment pipe and defining an outer circumferential surface, a rigid, radially extending wall connecting said carrier portion and said containment portion, and a flange integral with said containment portion and extending radially outward from said surface, said flange having a rectangular cross section and a thickness greater than said pipes; a reinforced concrete wall rigidly secured in place; and said flange being fixedly secured to said concrete wall.
Claim 2
Dependent Claim
128 words
A double-containment thermoplastic pipe assembly comprising: a double-containment pipe comprising an outer containment pipe and an inner carrier pipe disposed concentrically within the containment pipe; a restraint coupling having an inner carrier pipe portion connectable end to end to an end of said inner carrier pipe, an outer containment pipe portion connectable end to end to an end of said containment pipe and defining an outer circumferential surface, a rigid, radially extending wall connecting said carrier portion and said containment portion, and a flange integral with said containment portion and extending radially outward from said surface, said flange having a rectangular cross section and a thickness greater than said pipes; a reinforced concrete wall rigidly secured in place; and said flange being fixedly secured to said concrete wall.
Claim 3
Dependent Claim
19 words
An assembly as defined in claim 1 wherein said flange is cast in place in said reinforced concrete wall.
Claim 4
Dependent Claim
120 words
A double-containment polyethylene pipe assembly for underground use comprising: at least one manhole; a double-containment pipe comprising a plurality of linearly disposed sections, each section having an outer containment pipe and an inner carrier pipe, said sections being joined to one another in end-to-end relation; a restraint coupling having an inner carrier pipe portion connectable end to end to an end of said inner carrier pipe, an outer containment pipe portion connectable end to end to an end of said containment pipe, a rigid, radially extending wall connecting said carrier portion and said containment portion, and a radially outward extending flange integral with and disposed around said containment portion; and means securing said flange to a wall of said manhole.
Claim 5
Dependent Claim
120 words
A double-containment polyethylene pipe assembly for underground use comprising: at least one manhole; a double-containment pipe comprising a plurality of linearly disposed sections, each section having an outer containment pipe and an inner carrier pipe, said sections being joined to one another in end-to-end relation; a restraint coupling having an inner carrier pipe portion connectable end to end to an end of said inner carrier pipe, an outer containment pipe portion connectable end to end to an end of said containment pipe, a rigid, radially extending wall connecting said carrier portion and said containment portion, and a radially outward extending flange integral with and disposed around said containment portion; and means securing said flange to a wall of said manhole.
Claim 6
Dependent Claim
32 words
An assembly as defined in claim 3 wherein said manhole is made of concrete, and said means securing said flange comprises a portion of said wall cast in place around said flange.
Claim 7
Dependent Claim
67 words
An assembly as defined in claim 3 wherein said manhole is a precast concrete manhole, and said means securing said flange comprises a pair of rings engaging said flange at each side thereof and plurality of axially extending studs having their inner ends embedded in said wall, and means for rigidly connecting said studs to said rings at a location spaced apart outwardly from the manhole wall.
Claim 8
Dependent Claim
66 words
An assembly as defined in claim 5 wherein said double-containment pipe is connected to the outer end of said coupling, a carrier pipe is connected to its inner end, and a flanged containment pipe adapter section terminating near the manhole wall is secured to the containment pipe portion of said coupling on its inner end, and said adapter is disposed through an aperture in said wall.
Claim 9
Dependent Claim
20 words
An assembly as defined in claim 6 including a sealant disposed between said adapter and said wall around said aperture.
Claim 10
Dependent Claim
48 words
An assembly as defined in claim 7 including a pair of apertures in said wall, each having a restraint coupling and flanged adapter secured thereto, and said carrier pipe inside of said manhole being secured to the inside of each of said carrier pipe portions of said coupling.
Claim 11
Dependent Claim
65 words
An assembly as defined in claim 3 including a plurality of rigid spacers engaging the outside of the carrier pipe of said double-containment pipe and the inside of the containment pipe thereof, said spacers being disposed at predetermined locations along the length of said double-containment pipe for causing the carrier pipe to undergo controlled flexing upon expanding linearly as a result of differential thermal expansion.
Claim 12
Dependent Claim
133 words
A double-containment polyethylene pipe assembly for above-ground use comprising: a double containment comprising a plurality of sections, an inner carrier pipe disposed concentrically within a containment pipe; a restraint coupling having an inner carrier pipe portion connectable end to end to an end of said inner carrier pipe, an outer containment pipe portion connectable end to end to an end of said containment pipe, a rigid, radially extending wall connecting said carrier portion and said containment portion, and a radially outward extending flange having a rectangular cross section and integral with and disposed around said containment portion; a support member secured rigidly in place; means securing said flange to said support member; and said coupling having a carrier pipe section and a containment pipe section connected thereto on both ends of the coupling.
Claim 13
Dependent Claim
133 words
A double-containment polyethylene pipe assembly for above-ground use comprising: a double containment comprising a plurality of sections, an inner carrier pipe disposed concentrically within a containment pipe; a restraint coupling having an inner carrier pipe portion connectable end to end to an end of said inner carrier pipe, an outer containment pipe portion connectable end to end to an end of said containment pipe, a rigid, radially extending wall connecting said carrier portion and said containment portion, and a radially outward extending flange having a rectangular cross section and integral with and disposed around said containment portion; a support member secured rigidly in place; means securing said flange to said support member; and said coupling having a carrier pipe section and a containment pipe section connected thereto on both ends of the coupling.
Claim 14
Dependent Claim
36 words
An assembly as defined in claim 10 wherein said support member is a concrete wall embedded in the ground, and said means securing said flange is a portion of the concrete wall cast around said flange.
Claim 15
Dependent Claim
65 words
An assembly as defined in claim 11 including a pluraltiy of rigid spacers engaging the outside of the carrier pipe of said double-containment pipe and the inside of the containment pipe thereof, said spacers being disposed at predetermined locations along the length of said double-containment pipe for causing the carrier pipe to undergo controlled flexing upon expanding linearly as a result of differential thermal expansion.
Claim 16
Dependent Claim
24 words
An assembly as defined in claim 10 wherein said support member comprises a metal saddle and means securing the saddle to an underground footing.
Claim 17
Dependent Claim
37 words
An assembly as defined in claim 13 wherein said means securing said flange in place comprises a pair of rings engaging sides of said flange, said rings being rigidly secured to one another and to said saddle.
Claim 18
Dependent Claim
174 words
A double-containment thermoplastic pipe assembly comprising: a double-containment thermoplastic pipe comprising an outer containment pipe and an inner carrier pipe disposed concentrically within the containment pipe; a restraint coupling having an inner carrier pipe portion connectable end to end to an end of said inner carrier pipe, an outer containment pipe portion connectable end to end to an end of said containment pipe, and a rigid, radially extending wall connecting said carrier portion and said containment portion; an underground thermoplastic manhole having at least one aperture in a wall thereof for receiving a said restraint coupling; said restraint coupling having its outer containment pipe portion welded to said wall of said aperture; said restraint coupling at both ends thereof having its carrier pipe portion and its containment pipe portion joined to corresponding pipes of said double-containment pipe; a radially extending flange joined to the outside of said containment pipe outside of said manhole spaced apart longitudinally from said coupling; and a concrete ring cast around the outside of said manhole and enclosing said flange.
Claim 19
Dependent Claim
174 words
A double-containment thermoplastic pipe assembly comprising: a double-containment thermoplastic pipe comprising an outer containment pipe and an inner carrier pipe disposed concentrically within the containment pipe; a restraint coupling having an inner carrier pipe portion connectable end to end to an end of said inner carrier pipe, an outer containment pipe portion connectable end to end to an end of said containment pipe, and a rigid, radially extending wall connecting said carrier portion and said containment portion; an underground thermoplastic manhole having at least one aperture in a wall thereof for receiving a said restraint coupling; said restraint coupling having its outer containment pipe portion welded to said wall of said aperture; said restraint coupling at both ends thereof having its carrier pipe portion and its containment pipe portion joined to corresponding pipes of said double-containment pipe; a radially extending flange joined to the outside of said containment pipe outside of said manhole spaced apart longitudinally from said coupling; and a concrete ring cast around the outside of said manhole and enclosing said flange.
Claim 20
Dependent Claim
55 words
The assembly as defined in claim 15 including a spacer disposed radially between said inner and outer pipes inside said manhole in alignment with said flange and having an inner edge defining an aperture for being slid over and joined to said inner pipe and legs adapted to contact the inside of said outer pipe.
Claim 21
Dependent Claim
12 words
The assembly as defined in claim 15 wherein said thermoplastic is polyethylene.
Claim 22
Dependent Claim
12 words
An assembly as defined in claim 1 wherein said thermoplastic is polyethylene.
Claim 23
Dependent Claim
22 words
An assembly as defined in claim 3 wherein said flange has a rectangular cross section and a thickness greater than said pipes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |