Patent US4964296A successfully refreshed from Google Patents.
US4964296A
Expired / Lapsed
US
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Method and apparatus for detecting liquid leaks
Assignee: Mobil Oil AS
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Filing: 1989-09-28
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Granted: 1990-10-23
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Expires: 2009-09-28
Abstract
Abstract A liquid leak detector for above-ground tanks includes an upright standpipe connected to the tank so that the standpipe can be filled with liquid from the tank to the same level as the liquid in the tank. A pressure transducer is connected between the bottom of the tank and the bottom of the standpipe to measure the difference in pressure of the liquids in the tank and standpipe. Any change in the liquid pressure at the bottom of the tank as a result of leakage from the tank will change the pressure differential on the pressure transducer. This changes the output of the transducer which can be recorded to indicate leakage from the tank.
Inventors
- 👤 Jay E. Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:55
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/32; G01M3/3236; G01M3/3263
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A method of detecting leakage of a liquid from an above-ground tank of uniform dimensions comprising the steps of: filling an upright standpipe of uniform dimensions with liquid from the tank until the liquid in the standpipe is at the same level as the liquid in the tank; and measuring the pressure differential between the pressure of the liquid at substantially the bottom of the tank and the pressure of the liquid at substantially the bottom of the standpipe to determine any change in the pressure differential caused by leakage of liquid from the tank.
Claim 2
Independent Claim
95 words
A method of detecting leakage of a liquid from an above-ground tank of uniform dimensions comprising the steps of: filling an upright standpipe of uniform dimensions with liquid from the tank until the liquid in the standpipe is at the same level as the liquid in the tank; and measuring the pressure differential between the pressure of the liquid at substantially the bottom of the tank and the pressure of the liquid at substantially the bottom of the standpipe to determine any change in the pressure differential caused by leakage of liquid from the tank.
Claim 3
Dependent Claim
39 words
A method in accordance with claim 1 including connecting the top of the standpipe to the tank above the liquid in the tank so that the same ambient conditions are applied to the liquids in the tank and standpipe.
Claim 4
Dependent Claim
28 words
The method of claim 2, wherein the pressure differential is measured using a pressure transducer, the pressure transducer having an electrical output signal corresponding to the pressure differential.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein the pressure differential is measured using a pressure transducer, the pressure transducer having an electrical output signal corresponding to the pressure differential.
Claim 6
Dependent Claim
25 words
The method of claim 4, further comprising the step of connecting a recorder to the pressure transducer to record the output of the pressure transducer.
References Cited (Backward Citations)
FR607011A
Cited
US3257851A
Cited
US3902356A
Cited
US3939383A
Cited
US4389888A
Cited
JPS6189589A
Cited
US4862734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |