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Title: Ultrasonic Meter Installation & Design Considerations
Author: James Y. Lee
Source: 2007 Western Gas Measurement Short Course
Year Published: 2007
Abstract: The custody transfer gas flow measurement applications using ultrasonic meters in United States has passed decade. The basic theory behind using ultrasonic meter (USM) is when high frequency pulse (between 100 KHz to 300 KHz) signals are sent and received between pair of transducers and measures transit time of the signal. When the signal is sent in the direction of the gas flow, the transit time will be faster than when the signal is sent against the direction of the gas flow. This difference in transit time (in order of micro seconds and nano seconds) is measured and translate into gas velocity of gas in the pipe. The uncorrected volume can be calculated using the velocity of the gas and cross sectional area of the meter.

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