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Title: Calibration Of A Five Beam Ultrasonic Flowmeter For LNG At Cryogenic Temperatures
Author: Asaad Kenbar Peter Van Brakel Jeroen Van Klooster
Source: 2009 South East Asia Flow Measurement Conference
Year Published: 2009
Abstract: Liquefied Natural Gas (LNG) has traditionally been bought and sold on the basis of long term contracts, with the amount of energy transferred derived from measurements of tank volumes. However, as the contribution of LNG to global gas sales increases, it is likely that it will be increasingly traded on the basis of short-term (spot) prices in a similar way to crude oil. In such circumstances the use of flowmeters, the accepted method of measuring oil, becomes attractive for custody transfer measurement at receiving terminals. TUV NEL has conducted research to investigate the application of conventional flowmeters to LNG. This report forms part of this research work. The ultimate objective of this research work is to establish standards for cryogenic flow measurement, in particular for measurement of Liquefied Natural Gas (LNG). The aim of the work is to assist industry to establish a framework of measurement standards and capabilities. These will enable UK businesses and public authorities to make accurate flow measurements that will be accepted nationally and internationally. A comprehensive review covering LNG measurement technologies, calibrations and uncertainties has already been completed by TUV NEL 1. The review identified two types of flowmeters suitable for LNG flow measurement, namely Coriolis and ultrasonic flowmeters.

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