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Title: Determination Of Measurement Uncertainty For The Purpose Of Wet Gas Hydrocarbon Allocation
Author: Per Lunde, Kjell-Eivind Frysa, Svein Neumann, Einar Halvorsen
Source: 2002 North Sea Flow Measurement Workshop
Year Published: 2002
Abstract: A Handbook of uncertainty calculations - Ultrasonic fiscal gas metering stations 1 has been developed in a cooperation between NFOGM, NPD and CMR, addressing fiscal metering of gas using multipath ultrasonic transit time flow meters (USM). The many different approaches to calculating the uncertainty of ultrasonic gas metering stations have been a source of confusion - varying practice in this respect has definitely been experienced. The intention of the present initiative has been that a handbook together with a spreadsheet program EMU - USM Fiscal Gas Metering Station, based upon the principles laid down in the Guide to the expression of uncertainty in measurement (GUM) 2 and ISO/DIS 5168 3, would satisfy the need for a modern method of uncertainty evaluation in the field of ultrasonic fiscal gas measurement. In the present work, calculation of the expanded uncertainty of the following four metering station measurands is addressed: the actual volume flow rate, the standard volume flow rate, the mass flow rate, and the energy flow rate.

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