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Title: Effects Of Downstream Clean-Out Tees On Ultrasonic Meters
Author: Jeffry S. Snyder Frank Brown John R. Hand
Source: American Gas Association 2013
Year Published: 2013
Abstract: While attempting to achieve the 100 feet per second (fps) flow rate as requested, flow and pressure instability was experienced that TCC could not control. The pressure measured at the meter under test (MUT) was fluctuating by approximately 2 psi, very sporadically and the flow rate was fluctuating at approximately the same frequency. The indicated flow was too unstable to confidently calculate a reliable MUT deviation. TCC attempted to improve the dynamics of the flowing gas and isolate the source of the instability. The test facility gas supply piping configuration was changed several times, but the gas path changes did not improve the MUT instability situation. They increased the compressor discharge pressure approximately 30 psi and then lowered it 30 psi below the original operating pressure. Flow rate was reduced in steps, but the instability remained at the high flow rates. None of the facility configuration, flow or pressure changes produced stabile flow rates above 70 fps.

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