US3744823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature pipeline joints
Assignee: Shaw Pipe Industries Ltd
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Filing: 1972-02-25
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Granted: 1973-07-10
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Expires: 1992-02-25
Abstract
Abstract A joint between pipe sections of a pipeline capable of operating at high temperatures has the adjacent pipe sections welded together. Prior to joining, each section can be passed, if necessary, through an apertured, rigid, water, impermeable end cap which can be welded to the respective pipe section. Located between the ends of the factory applied insulation, and surrounding the welded joint, is a sleeve of asbestos surrounded by a sleeve of polyurethane. Overlying and sealed to the polyurethane is a polyethylene sleeve, heat sealed in position.
Inventors
- 👤 J Muir
- 👤 I Payne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:03
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/18; F16L58/181; F16L59/00; F16L59/14; F16L59/16; F16L59/18; F16L59/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
24 words
The pipe joint of claim 1 wherein a generally cylindrical layer of insulating material is proviDed between the pipe sections and the polyurethane sleeves.
Claim 2
Dependent Claim
40 words
The pipe joint of claim 1 wherein the sleeve of thermoplastic resin is sealed to said structure by heat sealing, said heat sealing being accomplished by embedding a resistance wire in the layer of thermoplastic and passing electric current therethrough.
Claim 3
Dependent Claim
39 words
The pipe joint of claim 1 wherein the water resistant sealant composition comprises an ambient temperature curing, liquid, terminally halogenated polybutadiene, and a curative therefor, said composition having been cured in situ into a water resistant, rubbery sealant composition.
Claim 4
Dependent Claim
48 words
The pipe joint of claim 1 wherein first and second apertured end caps of substantially water impermeable material are provided, each surrounding and in sealing engagement with a respective pipe section, and located near the juxtaposed ends thereof, the end caps being sealing engagement with the polyurethane sleeve.
Claim 5
Dependent Claim
74 words
The pipe joint of claim 5 wherein the end caps have axially presented end faces in sealing engagement with the end faces of both the polyurethane sleeve and the insulating layer, the polyurethane sleeve being of rigid foamed polyurethane, and the end caps have integral cylindrical skirt portions extending away from the juxtaposed ends of the pipe sections, the sleeve of thermoplastic material being heat sealed to the outer surface of said skirt portions.
Claim 6
Dependent Claim
46 words
The pipe joint of claim 6 wherein the end caps are of composite construction, having a metal portion and a rigid thermoset plastic portion, the respective pipe sections passing through the apertures in the end caps and being sealed to the respective end cap by welding.
Claim 7
Dependent Claim
36 words
The pipe joint of claim 7 wherein the skirt portions are of rigid thermoset resin, and have over the outer surfaces thereof a layer of thermoplastic, to which the sleeve of thermoplastic material is heat sealed.
Claim 8
Dependent Claim
12 words
The pipe joint of claim 8 wherein the insulating layer contains asbestos.
Claim 9
Dependent Claim
17 words
The pipe joint of claim 8 wherein the sleeve of thermoplastic resin is of high density polyethylene.
Claim 10
Dependent Claim
36 words
The pipe joint of claim 1 wherein the whole pipe joint assembly is overlaid by a water resistant thermoplastic sleeve, heat shrunk into tight engagement with the sleeve of thermoplastic resin, and overlying the ends thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |