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Title: Effects And Control Of Pulsation In Gas Measurement
Author: Robert J. Mckee
Source: 2006 International School of Hydrocarbon Measurement
Year Published: 2006
Abstract: Accurate gas measurement has always been important in the natural gas Industry and is even more essential in todays operating environment. Flow meters determine how much energy is bought and sold and how much a company is paid for transporting the gas. The value of accurate flow metering has never been higher than it is today. One of the most common and difficult to identify errors in metering is that caused by pulsating flow. Periodic unsteady flows, known as pulsating flows, can produce measurement bias errors in all types of gas flow meters. It is important to understand the effects that pulsations have on the common flow meter types used in the gas industry so that any result measurement inaccuracies can be identified and avoided. It is also essential to identify ways to control the effects of pulsation by reducing pulsation amplitudes or by eliminating pulsation with properly designed acoustic filters. This paper describes the effects of pulsation on orifice, turbine, ultrasonic, and a few other flow meter types. Suggestions on how to mitigate pulsation effects at meter installations, including a specific procedure for designing acoustic filters that can isolate a flow meter from the source of pulsation, are also provided.

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