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Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - General principles and requirements has-digital Plastics – Generic identification andMeasurement of fluid flow by means of pressure differential devices inserted in circular cross section conduits running full Part 1: General principles and requirements Executive summary General principles for methods of measurement and computation of the flow rate of fluid flowing in circular cross section conduits running full. Abstract This International Standard, a part of the ISO 5167 series, defines terms and symbols and establishes the general