This document defines the testing and reporting protocols for flow measurement devices based on the detection of a pressure differential that is created by the device in a flowing stream. These protocols are designed to supply industry with a comparable description of the capabilities of these devices for the measurement of single-phase fluid flow when they are used under similar operating conditions.
API MPMS Chapter 5.7
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API Manual of Petroleum Measurement Standards, Chapter 5 , Metering -Section 7, Testing Protocol for Differential Pressure Flow Measurement Devices, First Edition