| 摘要 |
A method of leakage testing a volatile liquid tank farm together with a vapour recovery system, to collect vapour from the tanks at the time of re-filling them with volatile liquid. The tank farm has individual fill-pipes (13) for each tank (10) with each fill-pipe outlet below the normal minimum liquid level in the tank and each tank having a vent-pipe (11) connected to a common manifold (25). To perform the test, the common manifold is closed to atmosphere and one side of a shut-off valve (17) is connected to the manifold (25), a flow meter (20) being connected to the other side of the shut-off valve. Flow meters (22, 23) are coupled to all but one of the fill-pipes (13), the shut-off valve (17) is opened to allow volatile liquid to be supplied to the remaining fill-pipe so as to increase the volume of volatile liquid in the associated tank, and the out-flow of gas or wet vapour from the common manifold (25) is monitored via the flowmeters (20, 22, 23) for substantial correlation to the volume of volatile liquid admitted into the tank associated with the remaining fill-pipe. The method can be modified also to allow the testing of individual tanks of a tank farm, where the vent pipes of the tanks individually vent to atmosphere, with the leakage test or vapour recovery system test then being performed one at time, on each of the individual tank(s).
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