Patent ID: 6578408
Filing Date: 2003-06-17
Classification: G01M

Abstract:
A method of testing a transportable storage tank, said tank comprising a foot valve located between a liquid storage compartment and an outlet pipe, said method comprising closing said foot valve, disposing said storage compartment at a first gas pressure, which is positive in relation to atmospheric pressure, disposing said outlet pipe at a second gas pressure, which is negative in relation to atmospheric pressure, and monitoring the pressure within said storage compartment or said outlet pipe in order to determine whether said foot valve is subject to leakage;said tank further comprising a vapor recovery conduit separated from said liquid storage compartment by a further valve, said method further comprising: fluidly sealing said further valve; disposing said vapor recovery conduit at a third gas pressure, different to a gas pressure in said liquid storage compartment; and monitoring pressure within said vapor recovery conduit or said liquid storage compartment in order to determine whether said further valve is subject to leakage.