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Title: Ethylene Measurement
Author: James E. Gallagher
Source: 1988 International School of Hydrocarbon Measurement
Year Published: 1988
Abstract: Shell Pipe Line Corporation, cognizant of the importance of highly accurate orifice measurement for polymer-grade ethylene, embarked on a development program to improve the overall uncertainty of orifice metering. The programs goal was to successfully apply master meter proving techniques to dense phase ethylene orifice meter facilities operated on a mass basis. This paper presents the techniques and results of mass proving concentric, square edged, flange tapped orifice meters. All data were obtained on commercially operated metering facilities which are in compliance with ANSI 2530 requirements. Results indicate an overall orifice meter uncertainty tolerance of approximately + 0.31 percent is attainable when orifice meters are mass proved in situ using master meter proving techniques.

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