초록 ▼

A system for detecting leaks in hazardous liquid tanks, particularly underground gasoline tanks at service stations. The tank is filled incompletely to leave a space in the tank which is then filled with a gas under pressure. A reference tank is disposed within this space and continuous streams of g

A system for detecting leaks in hazardous liquid tanks, particularly underground gasoline tanks at service stations. The tank is filled incompletely to leave a space in the tank which is then filled with a gas under pressure. A reference tank is disposed within this space and continuous streams of gas are forced into the liquid in the reference tank and the liquid in the tank being measured. Resistance to gas introduction in the reference tank is compared with the resistance to gas introduction in the gasoline tank and monitored during a test period to note any differential variation which would indicate a leak in the tank.

대표청구항 ▼

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, comprising: a. means for filling the tank space above the surface of the liquid t

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, comprising: a. 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 said liquid surface; b. a fluid containing receptacle disposed in the tank space above the surface of the liquid; c. 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 said liquid and into the said 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 d. 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 said fluid and indicating any differential pressure variation over a time period.