System for detecting leaks in underground fuel tanks and the like
This patent describes a system for detecting leaks in incompletely filled liquid storage tanks, incorporating projecting fill and vent pipes, which systems are connected with a liquid withdrawal system normally isolated from the atmosphere. It comprises: means for filling the tank space above the surface of the liquid therein with a gas under a pressure greater than atmospheric pressure and maintaining a gaseous pressure on the the liquid surface; a fluid containing receptacle disposed in the tank space above the surface of the liquid; means including a pair of tubular parts, one extending to a predetermined depth of submersion in the liquid in the tank and the other extending to a predetermined depth of submersion in the fluid in the receptacle for forcing a continuous stream of bubbles of gas into the the liquid and into the the fluid whereby the resistance to gas introduction is influenced in each by the composite effect of the pressure of the gas on the surface of the liquid and the head at which the bubbles are introduced; and means for balancing the pressure required to flow the continuous stream of bubbles into the liquid against the pressure required to flow the continuous stream of bubbles into the fluid and indicating any differential pressure variation over a time period.
- Assignee:
- NOV; NOV-90-006221; EDB-90-075659
- Patent Number(s):
- US 4885931; A
- Application Number:
- PPN: US 7-167779A
- OSTI ID:
- 6975563
- Resource Relation:
- Patent File Date: 14 Mar 1988
- Country of Publication:
- United States
- Language:
- English
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