ASME PTC 19.2 (Performance Test Code 19.2) is the industry standard for Pressure Measurement Instruments and Apparatus
A "fixed" pressure measurement is only as good as the tap installation. ASME PTC 19.2 outlines strict geometry rules to prevent flow disturbance. asme ptc 192 fixed
A common confusion among engineers is whether to use the Fixed or Comparison method. Here is a direct comparison: ASME PTC 19