The document you are looking for is likely ASME PTC 19.2 , which stands for Pressure Measurement Instruments and Apparatus
Calculating measurement uncertainty and applying corrections. asme ptc 192 pdf
In performance testing, even a 0.5% error in pressure can lead to: The document you are looking for is likely ASME PTC 19
It defines the differences between:
ASME PTC 19.2 is a performance test code that provides guidelines for measuring the moisture content of steam in power plants and other industrial facilities. The code outlines the procedures and instrumentation required to accurately determine the moisture content of steam, which is essential for optimizing plant performance, efficiency, and reliability. asme ptc 192 pdf