Ultrasonic flow meters have gained industry acceptance for many applications including custody transfer.Custody transfer applications were made possible when in October 2002 API Committee on Petroleum Measurement published the Draft Standard entitled "Measurement of Liquid Hydrocarbons by Ultrasonic Flowmeters Using Transit Time Technology".In October,2004,a slightly revised version of this draft was accepted as a full standard (Chapter 5.8) for inclusion into the API Manual of Petroleum Measurement Standards putting this technology on a par with PD meters,turbine meters and Coriolis meters.This paper will delve into some of the ways the ultrasonic flow meters are changing the techniques for precision petroleum measurement.
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