Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1983-10-11
1989-03-14
Cuchlinski, Jr., William A.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73149, 73240R, 73290V, 73295, G01F 2300
Patent
active
048116017
ABSTRACT:
The rate of leaking from a liquid storage tank may be accurately determined by measuring the change in volume of the tank over a period of time, and during said same period (or during a period immediately before or after said measuring period, or both,) measuring the change in length of a probe which extends from the bottom of the tank to the top, and calculating, from the change in length of said probe, the change in volume of the liquid in the tank due to changes in temperature throughout the entire height of the tank. In one embodiment of the invention, the probe is a rod of material which has a high coefficient of thermal expansion and which is inert to the liquid being tested. Since each segment of the rod assume a length which is a function of the temperature at the level of that segment, the rod assumes a length which is a function of the integrated temperatures from the top of the bottom of the tank. Therefore changes in length of the rod are proportional to the total change in volume of the liquid due to temperature change. This change in volume may be applied algebraically to the total measured change in volume to obtain the change in volume due to leakage.
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Bissell Henry M.
Cuchlinski Jr. William A.
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