ISO 5167 compliance is the foundational international benchmark for measuring fluid flow using Differential Pressure (DP) devices in full-bore circular pipelines. Widely used across the oil and gas industry, it dictates the precise geometry, installation, and operating guidelines required to calculate flow rates and measurement uncertainties accurately.
Unlike alternative standards such as API MPMS 14.3 / AGA-3 (which focus almost exclusively on natural gas custody transfer), ISO 5167 covers a broader range of industrial fluids—including liquids, vapors, and gases—under strict subsonic, single-phase conditions. Structure of the ISO 5167 Series
The International Organization for Standardization (ISO) divides ISO 5167 into six distinct sections based on the specific type of primary DP element deployed:
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