US4147274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating roof tank seal
Assignee: Shell USA Inc
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Filing: 1978-05-12
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Granted: 1979-04-03
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Expires: 1998-05-12
Abstract
Abstract A rim seal is provided for a floating roof tank to fill the space between the floating roof and circumferential wall of the tank. The seal is a compressible toroid of approximately the diameter of the tank and has a cross-sectional diameter greater than the largest opening between the floating roof and the circumferential wall or an existing seal and the circumferential wall. An inner tube is provided which encapsulates the toroid; an outer tube is provided which is elastic and encapsulates the inner tube. Slits in the outer tube adjacent to the circumferential wall are disposed substantially circumferentially with respect to the toroid.
Inventors
- 👤 William E. Hall
- 👤 James G. Record
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:19
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/34; B65D88/42; B65D88/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
A rim seal for a floating roof tank to seal the space between the floating roof and circumferential wall of the tank, comprising, a compressible toroid of approximately the diameter of the tank and having a cross-sectional diameter greater than the largest opening between the floating roof and the circumferential wall or an existing seal and the circumferential wall, an inner tube which encapsulates the toroid, an outer tube which is elastic and encapsulates the inner tube, slits in the outer tube adjacent the circumferential wall and disposed substantially circumferentially with respect to the toroid, and means for attaching the rim seal to the floating roof.
Claim 2
Dependent Claim
106 words
A rim seal for a floating roof tank to seal the space between the floating roof and circumferential wall of the tank, comprising, a compressible toroid of approximately the diameter of the tank and having a cross-sectional diameter greater than the largest opening between the floating roof and the circumferential wall or an existing seal and the circumferential wall, an inner tube which encapsulates the toroid, an outer tube which is elastic and encapsulates the inner tube, slits in the outer tube adjacent the circumferential wall and disposed substantially circumferentially with respect to the toroid, and means for attaching the rim seal to the floating roof.
Claim 3
Dependent Claim
20 words
The seal of claim 1 wherein the distance between the slits is from about 1/4 inch to about 1/2 inch.
Claim 4
Dependent Claim
20 words
The seal of claim 1 wherein the length of the slits is from about 7 inches to about 9 inches.
Claim 5
Dependent Claim
11 words
The seal of claim 1 wherein the toroid is polyurethane foam.
Claim 6
Dependent Claim
11 words
The seal of claim 1 wherein the inner tube is Buna-N-rubber.
Claim 7
Dependent Claim
12 words
The seal of claim 1 wherein the outer tube is urethane-nylon fabric.
Claim 8
Dependent Claim
26 words
The seal of claim 1 wherein the distance between the slits varies in accordance with the distance between protuberances on the inside of the circumferential wall.
Claim 9
Dependent Claim
14 words
The seal of claim 7 wherein the protuberances are rivets, plate overlaps, or welds.
Claim 10
Dependent Claim
11 words
The seal of claim 1 wherein the inner tube is elastic.
References Cited (Backward Citations)
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Cited
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GB882189A
Cited
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Cited
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Cited
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Cited
US4099643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |