US3578892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaseous sealing devices
Assignee: Airoil Burner Co Ltd
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Filing: 1969-03-12
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Granted: 1971-05-18
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Expires: 1989-03-12
Abstract
Abstract A gaseous sealing device intended particularly for use with flare stacks. The device is composed of two hollow members disposed one within another and a number of walls extending between the members to form first and second chambers communicating with one another, the second chamber communicating with the interior of the innermost member open to the atmosphere. The first chamber receives a waste gas from the flare stack and the gas passes through the first chamber in one direction, through the second chamber in the reverse direction and finally through the innermost member again in said one direction. When the gas flow ceases air is prevented from passing into the first chamber by waste gas trapped in the device.
Inventors
- 👤 Ronald D Wilkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:32
CPC Classifications
F; F23; F23G; F23G7/00; F23G7/06; F23G7/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
168 words
A gaseous sealing device comprising two hollow members disposed one within another, one end of the innermost member being disposed within the outermost member, the other end of the innermost member being disposed externally of the outermost member and open to the atmosphere a first wall positioned near said other end of the innermost member and extending between the innermost surface of the outermost member and the outermost surface of the innermost member to close the gap between the members, second and third walls extending between the innermost surface of the outermost member and the outermost surface of the innermost member to divide the gap between the members into two chambers communicating with one another near said first wall, a further wall extending across said one end of the innermost member and adjoining the innermost surface of the outermost member to close the gap between the members, a section being cut away from the innermost member adjacent said one end to form an inlet to the interior thereof.
Claim 2
Dependent Claim
22 words
A device according to claim 1, wherein the gas admitting means includes a source of purge gas communicating with said first chamber.
Claim 3
Dependent Claim
77 words
A device according to claim 1, wherein said two walls extend between the outer surface of the second member and the inner surface of the first member, the third wall of said at least three walls extends across said other end of the second member and adjoins a part of the innermost surface of the first member and a section is cut away from the second member adjacent said other end thereof to provide an inlet thereto.
Claim 4
Dependent Claim
22 words
A device according to claim 4, wherein each of said two walls extend tangentially of the outer surface of the second member.
Claim 5
Dependent Claim
22 words
A device according to claim 4, wherein each of said two walls extends radially of the outer surface of the second member.
Claim 6
Dependent Claim
17 words
A device according to claim 1, wherein a syphon tube extends between the first and second chambers.
Claim 7
Dependent Claim
29 words
A device according to claim 4, wherein a syphon tube extends between the first and second chambers and has an inlet formed by a bore in said third wall.
Claim 8
Dependent Claim
58 words
A device according to claim 1, wherein two frustoconical elements are provided each having its widest end attached to one of the ends of the second member and having its narrowest end directed outwardly of the device, one of said frustoconical elements forming said closure and having its narrowest end adjoining the outer surface of the second member.
Claim 9
Dependent Claim
188 words
A flare stack incorporating a gaseous sealing device, said device comprising a first hollow member connected to said stack, a second hollow member disposed within said first hollow member, one end of said second member being open to the atmosphere and the other end of said second member being disposed within said first member, a closure closing an end of said first member adjacent said one end of said second member, at least three walls extending between said first and second members, a first chamber defined by a portion of the inner surface of said first member, by said closure and by two of said at least three walls; a second chamber defined by at least some of the remaining portion of the inner surface of said first member and by said at least three walls, said first and second chambers communicating adjacent said closure and said second chamber communicating with said second member at said other end thereof, a gas flow path extending through said first chamber in one direction, through said second chamber in the reverse direction and through the second member in said one direction.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |