US3673850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level detector
Assignee: Cameron Solutions Inc
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Filing: 1970-12-03
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Granted: 1972-07-04
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Expires: 1990-12-03
Abstract
Abstract In the environment of a subsea storage tank for petroleum production, a primary element is mounted within a tube extended through the tank top to sense the oil-water interface within the tank. A pump and storage system is connected to the tube to alternately fill the tube with sea water and oil for calibration purposes.
Inventors
- 👤 Bill S Burrus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:14
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/26; G01F23/263; G01F23/268
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A level detector including calibrating means for the oilwater interface in a subsea storage tank, including, an open-bottomed tube mounted on the tank to extend over the expected range of interface variation within the tank, a primary element extended down into the tube to respond to the interface over its range, a first valved conduit connected between the upper portion of the tube and the oil stored within the tank, a second valved conduit connected to the upper portion of the tube, a storage tank connected to the second conduit and positioned high enough above the tube for the sea water to lift oil from within the tube into the storage tank for calibration with the tube filled with water, and a pump connected to the second conduit and tank to force oil from the storage into the full length of the tube for calibration with the tube filled with oil.
Claim 2
Dependent Claim
151 words
A level detector including calibrating means for the oilwater interface in a subsea storage tank, including, an open-bottomed tube mounted on the tank to extend over the expected range of interface variation within the tank, a primary element extended down into the tube to respond to the interface over its range, a first valved conduit connected between the upper portion of the tube and the oil stored within the tank, a second valved conduit connected to the upper portion of the tube, a storage tank connected to the second conduit and positioned high enough above the tube for the sea water to lift oil from within the tube into the storage tank for calibration with the tube filled with water, and a pump connected to the second conduit and tank to force oil from the storage into the full length of the tube for calibration with the tube filled with oil.
Claim 3
Dependent Claim
37 words
The detector and calibration means of claim 1 including, manifesting means connected to the primary element for display of the interface location within the tank and mounted on a sealing structure for the top of the tube.
Claim 4
Dependent Claim
40 words
The detector and calibration means of claim 1 including, a third valved conduit connected to the upper portion of the tube at a location where gas is removed from the tube to obviate it affecting the interface in the tube.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |