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Title: How Todays Gas Ultrasonic Meter Handles Compressor Pulsations
Author: John Lansing
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: To date limited testing has been done to determine the effects pulsation in the gas stream may have on the ultrasonic meters accuracy and performance. Some previous testing does show that there may be an impact on accuracy when the frequency of the pulsation is the same as, or a multiple of, the sampling frequency of the ultrasonic meter. AGA 9 Ref 1 discusses pulsation and indicates errors from pulsation can occur depending upon the level of pulsation. However, as little data exists on the potential affects, it is only mentioned in this document. To more clearly understand the pulsation impact, SICK sponsored tests that were conducted at the TransCanada Pipe Line Didsbury Gas Dynamic Test Facility (GDTF). This is also known as the NOVA Chemical Didsbury Test Facility. The results shown in this presentation are for an NPS 8 - FLOWSIC600 4 + 1 meter, also known as the 2plex design. A series of flow rates, frequency of pulsations, and amplitudes were generated upstream of the meter. The accuracy of the ultrasonic meter was determined by comparison to sonic nozzles that are located upstream of the pulsation source in such a manner so as to be unaffected by the pulsations being generated

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