ASME PTC 19.2-2019 is a performance test code (PTC) published by the American Society of Mechanical Engineers (ASME) that provides guidelines for conducting and reporting performance tests on steam turbines. ASME PTC 19

You're referring to the ASME PTC 19.2 standard! including measurement of steam flow

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ASME PTC 19.2-2019, "Steam Turbines"

This code provides procedures for conducting performance tests on steam turbines, including measurement of steam flow, power output, and efficiency. It covers various types of steam turbines, including impulse, reaction, and combined impulse-reaction turbines.