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Title: ISO Standards On Differentialpressure Flow Measurement: Developments
Author: Michael Reader-Harris
Source: 2006 South East Asia Flow Measurement Conference
Year Published: 2006
Abstract: Differential-pressure meters are commonly used in many areas of flow measurement, but particularly in the measurement of large gas flows. The principal ISO standard, ISO 5167, was published in 4 parts in 2003: general (ISO 5167-1), orifice plates (ISO 5167-2), nozzles and Venturi nozzles (ISO 5167-3), and Venturi tubes (ISO 5167-4) 1-4. The changes were described in 5. The main areas of change are summarized below. Following the publication of ISO 5167 three documents that depend on it are being revised: the guidelines in ISO/TR 9464 6, ISO/TR 12767 7 on the effect of not complying with ISO 5167, and ISO/TR 15377 8 on nozzles and orifice plates beyond the scope of ISO 5167. At the same time ISO 2186 9 on impulse lines is being revised. The main changes are described below.

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