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Title: Acoustical Filter Design
Author: Henry W. Poellnitz
Source: 1993 Western Gas Measurement Short Course
Year Published: 1993
Abstract: Acoustic filters are used to dampen flow pulsations generally caused by reciprocating compressors. Measurement inaccuracies attributable to pulsating flow are recognized as a major problem in the natural gas industry. The phenomenon of square root error (SRE) in orifice measurement bas been discussed for more than twenty years, but only recently has technology made it possible to develop equipment that can accurately measure SRE by use of a square root error indicator (SREI).

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