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Title: Traceable Calibration Of Liquid Densitometers
Author: Norman Glen
Source: 2008 North Sea Flow Measurement Workshop
Year Published: 2008
Abstract: Density measurement is a key element of both mass and volume flowrate measurement in the oil industry and as such is fundamental to the commercial operation of facilities. The most widely implemented approach for mass flow measurement is to use a volumetric flowmeter and a densitometer. All flowmeters require periodic calibration and traceability within the UK is provided through the Flow Programme. All commercial densitometers also require periodic calibration. In 2004 the Aberdeenbased Energy Resources Development Unit of DTIs Energy Group identified a need for research into practical methods for in-situ calibration of densitometers, as well as a greater understanding of the effects on densitometer performance of variations in product density, pressure and temperature. This is particularly important as more and more operators are involved in smaller field developments tied back to other operators platforms, feeding third-party pipeline infrastructures. In addition, as more HTHP fields come on stream, more densitometers will be operating at temperatures and pressures significantly different from those currently used as the reference conditions for calibration. TUV NEL, the custodians of the UK Fluid Density Standards, are leading a Joint Industry Project (JIP) aimed at providing the oil and gas industry with confidence in densitometer performance, by developing a calibration procedure which links traceably to National Standards. Fourteen operators, a densitometer manufacturer and the UK oil and gas regulator (part of the Department for Business, Enterprise and Regulatory Reform) have joined the project.

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