초록 ▼

A method of inspecting storage tanks for leaks by means of pressure decrease and increase in the tanks, in which a part of a liquid 6 stored in a tank 1 is discharged to put the tank 1 under vacuum and variations in the pressure in the tank 1 with time are checked, the pressure in the tank 1 is ther

A method of inspecting storage tanks for leaks by means of pressure decrease and increase in the tanks, in which a part of a liquid 6 stored in a tank 1 is discharged to put the tank 1 under vacuum and variations in the pressure in the tank 1 with time are checked, the pressure in the tank 1 is thereafter increased to the level of the atmospheric pressure, and then the liquid which was discharged from the tank is poured back thereinto to put the tank under pressure and variations in the pressure in the tank with time are checked. The method is done by an apparatus designed for inspecting storage tanks for leaks by means of pressure decrease and increase in the tanks, having an air pipe (2), a measuring pipe (3), a liquid feed pipe (4), a liquid suction pipe (5) and an air-tight container (7), which are communicated with a tank (1) to be inspected, a pressure regulator pump (8) connected to the air-tight container (7), and a manometer (11) and a recording air gauge (10) connected to the measuring pipe (3).

대표청구항 ▼

A method of testing for leakage of a tank that contains a liquid having a high vapor pressure, said method being characterized by: A. sealing the tank from the atmosphere; B. with the tank thus sealed, withdrawing from the tank to a container a part of the liquid stored in the tank, to reduce pressu

A method of testing for leakage of a tank that contains a liquid having a high vapor pressure, said method being characterized by: A. sealing the tank from the atmosphere; B. with the tank thus sealed, withdrawing from the tank to a container a part of the liquid stored in the tank, to reduce pressure in the portion of the tank that is above the liquid therein to a subatmospheric value; C. making a first measurement of the rate of increase per unit of time of pressure in said portion of the tank, during at least a final portion of a period long enough to ensure that said rate has attained a stable value; D. while said part of the liquid remains in said container, venting the tank to atmosphere to equalize pressure in said portion of the tank with atmospheric pressure; E. thereafter resealing the tank from the atmosphere; F. with the tank resealed, returning to the tank from said container the part of the liquid that had been withdrawn from the tank, to increase the pressure in said portion of the tank to an above-atmospheric value; and G. making a second measurement of the rate of increase per unit of time of pressure in said portion of the tank, through at least a final portion of a period long enough to ensure that said rate has attained a stable value, for comparison with the rate found by said first measurement, the existence of a leak in the tank being signified by a difference between the compared rates.