ISO technical report to help oil and gas sector measure flowrate in pipelines

The oil and gas sector will benefit from a recently published technical report from ISO on measuring flowrate in pipelines.

ISO/TR 9464:2008, Guidelines for the use of ISO 5167:2003, presents guidance on applying the rules and requirements of ISO 5167 based on theory and experimental work undertaken in the field of flow measurement. The report will help petroleum and gas shippers and producing, exporting and importing nations to get the best from ISO 5167:2003, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full.

ISO 5167:2003 is an International Standard (in four parts) for flow measurement based on the differential pressure generated by a constriction introduced into a circular conduit. It covers the geometry and method of use (installation and operating conditions) of orifice plates, nozzles and Venturi tubes when they are inserted in a conduit running full to determine the flowrate of the fluid flowing in the conduit. It also gives necessary information for calculating the flowrate and its associated uncertainty.

ISO/TR 9464 answers some important questions which might arise on the use of ISO 5167, for example, on calculating upstream from downstream temperature. With the application of the rules it provides, it is practicable to achieve flow measurement within an uncertainty of approximately 1 % of the calculated flowrate.

The report gives supplementary guidance on the use of all parts of ISO 5167 and information on the use of essential secondary instrumentation, including measurement of pressure, differential pressure, temperature, density and electrical supply.

ISO/TR 9464:2008, Guidelines for the use of ISO 5167:2003, was developed by ISO technical committee ISO/TC 30, Measurement of fluid flow in closed conduits, subcommittee SC 2, Pressure differential devices. It costs 164 Swiss francs and is available from ISO national member institutes (see the complete list with contact details) and from ISO Central Secretariat through the ISO Store or by contacting the Marketing & Communication department (see right-hand column).