August 2007

Special Report: Fluid Flow and Rotating Equipment

Use liquid ultrasonic meters for custody transfer

This technology is gaining widespread acceptance in the field

Seiler, D., Syrnyk, P., Daniel Division, Emerson Process Management

Using liquid ultrasonic meters for liquid petroleum applications such as custody transfer or allocation measurement is gaining global acceptance by the hydrocarbon processing industry. Ultrasonic technology is well established but using it for custody transfer and allocation measurement is relatively new. End users often try to utilize the same measurement practices that apply to turbine technology. While the two approaches share some similarities—such as the need for flow conditioning and upstream and downstream piping requirements—there are also differences. Several in-situ proving methods can be used to successfully field calibrate a liquid ultrasonic meter. Transit time

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