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US4449852A
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Buckle arrestor
Assignee: Shell USA Inc
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Filing: 1982-07-30
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Granted: 1984-05-22
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Expires: 2002-07-30
Abstract
Abstract A pipeline buckle arrestor or preventor is provided which is composed of a fiber-reinforced resin cover secured to at least a portion of the outside of the pipeline and a polymer-concrete formulation encapsulating the resin cover.
Inventors
- 👤 Larry C. Muszynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:00
CPC Classifications
F; F16; F16L; F16L13/00; F16L13/02; F16L13/04; F16L13/0254; F16L13/0272; F16L57/00; F16L57/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
37 words
A pipeline buckle arrestor or preventor secured to the outside circumference of a minor portion of a steel pipeline comprising a fiber-reinforced resin cover immediately adjacent to the pipeline and a polymer-concrete formulation encapsulating the resin cover.
Claim 2
Dependent Claim
37 words
A pipeline buckle arrestor or preventor secured to the outside circumference of a minor portion of a steel pipeline comprising a fiber-reinforced resin cover immediately adjacent to the pipeline and a polymer-concrete formulation encapsulating the resin cover.
Claim 3
Dependent Claim
18 words
The arrestor of claim 1 wherein the resin is a B-staged epoxy and the polymer-concrete formulation includes aggregate.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein the buckle arrestor is electrically conductive for cathodic protection purposes.
Claim 5
Independent Claim
69 words
A method for preventing a collapse from propagating along an underwater pipeline, comprising increasing the hoop strength of a minor portion of the pipeline in at least one location by bonding a high tensile strength cover of fiber-reinforced resin thereto and increasing the moment of inertia of the pipeline in the same location by encapsulating the high tensile strength cover with a high compressive strength cover of polymer-concrete formulation.
Claim 6
Independent Claim
69 words
A method for preventing a collapse from propagating along an underwater pipeline, comprising increasing the hoop strength of a minor portion of the pipeline in at least one location by bonding a high tensile strength cover of fiber-reinforced resin thereto and increasing the moment of inertia of the pipeline in the same location by encapsulating the high tensile strength cover with a high compressive strength cover of polymer-concrete formulation.
Claim 7
Dependent Claim
12 words
The method of claim 4 wherein the fiber-reinforced resin is B-staged epoxy.
Claim 8
Dependent Claim
31 words
The method of claim 4 wherein said at least one location is where two pipes are joined together and the covers reduce the likelihood of the pipeline bursting at said location.
Claim 9
Dependent Claim
20 words
The method of claim 4 wherein said bonding is effected by heating the pipeline to about 350° to 500° F.
Claim 10
Dependent Claim
20 words
The method of claim 7 wherein the fiber-reinforced resin is a preimpregnated laminate which is wrapped around the heated pipeline.
Claim 11
Dependent Claim
14 words
The method of claim 8 wherein the pipeline is heated with an induction heater.
Claim 12
Dependent Claim
18 words
The method of claim 8 wherein the polymer-concrete formulation is added between concrete weight coatings around the pipeline.
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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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |