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Title: LNG Tank Level Measurement
Author: Mason P. Wilson, Jr.
Source: American Gas Association 1976
Year Published: 1976
Abstract: Most bulk liquid custody transfer in the world today is accomplished by using flow meters, usually a turbine or orifice meter. Unfortunately, the market demand has not been sufficient to warrant the development of these typeof meters for use with LNG. Small turbine meters rated for LNG service (1) do exist but for the most part these are for flow rates that are of the order of magnitude normally found in truck custody transfer. Consequently, ship type custody transfer of LNG must rely on tank level measurements before and after unloading of the cargo. Accurate, within 0.5% and more often 0.1 to 0.2%. inventory closures can be obtained in practice provided proper attention is given to both land based and shipboard instrumentation.(2) Errors substantially greater can occur to the unwary making one wish they had paid sufficient attention to measurement details before the first annual inventory shows a net operating loss. Good custody transfer begins when the terminal or ship is on the drawing boards and in the writing of sales contracts. Everything that occurs after this stage is patchwork, never-lhe-less, it is never too late to try to recoup actual or anticipated revenue losses, the sooner, the better.

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