Patent US3929166A successfully refreshed from Google Patents.
US3929166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipeline thermal insulation
Assignee: Kawasaki Thermal Systems Inc
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Filing: 1973-08-09
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Granted: 1975-12-30
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Expires: 1993-08-09
Abstract
Abstract Preformed foam insulation in longitudinal sections forming segments of an annulus are bonded to outer sheet metal covers. The segments are assembled about a pipeline which is to carry hot gas or oil in a cold climate such as the Arctic. To eliminate shear forces on the insulation because of differential thermal expansion and contraction of the pipe and the cover, the insulation has an inner diameter larger than the outer diameter of the pipe and friction reducing means is provided between the insulation and the pipe.
Inventors
- 👤 Robert J Westerheid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:37
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/02; F16L59/021; F16L59/024; F16L59/04; F16L59/12; Y; Y10; Y10S; Y10S285/00; Y10S285/904
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
Improved insulation for application to a pipe carrying hot fluids in an environment which is cool relative to the fluids comprising: preformed foamed insulation in a longitudinal section forming a segment of an annulus; said annulus having an inner diameter sufficiently larger than the outer diameter of the pipe to permit free relative axial movement between the pipe and the insulation; a segmented sheet metal cover to which said insulation is bonded; and friction reducing means between the inner surface of said segment and the outer surface of said pipe to eliminate shear forces in the foamed insulation when the relative movement occurs, whereby friction between said pipe and said segment is reduced.
Claim 2
Dependent Claim
113 words
Improved insulation for application to a pipe carrying hot fluids in an environment which is cool relative to the fluids comprising: preformed foamed insulation in a longitudinal section forming a segment of an annulus; said annulus having an inner diameter sufficiently larger than the outer diameter of the pipe to permit free relative axial movement between the pipe and the insulation; a segmented sheet metal cover to which said insulation is bonded; and friction reducing means between the inner surface of said segment and the outer surface of said pipe to eliminate shear forces in the foamed insulation when the relative movement occurs, whereby friction between said pipe and said segment is reduced.
Claim 3
Dependent Claim
23 words
The insulation of claim 1 further including: securing means molded in said insulation for securing said insulation to said pipe at spaced intervals.
Claim 4
Dependent Claim
14 words
The insulation of claim 1 wherein: said friction reducing means is a polyethylene sheet.
Claim 5
Dependent Claim
19 words
The insulation of claim 3 wherein: said sheet is bonded to the inner surface of said insulation section. >
References Cited (Backward Citations)
US2330966A
Cited
US2718273A
Cited
US2841203A
Cited
US3317074A
Cited
US3284860A
Cited
US3289491A
Cited
US3563825A
Cited
US3491171A
Cited
US3359351A
Cited
US3685546A
Cited
US3628572A
Cited
US3728187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |