Nominal diameter of instrument interface
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For industrial metal piping design codes, for steam pipes with a design pressure of not more than 6.3 MPa or a design temperature of not more than 425°C, the nominal diameter of the instrument connections shall be not less than 15 mm； For pipelines that meet the conditions mentioned above and are subject to vibration, the nominal diameter of the instrument interface should not be less than 20 mm ； When the nominal diameter of the main pipe is less than 20 mm, the instrument interface should not be smaller than the diameter of the main pipe. May I ask how the nominal diameter of the instrument interface above was determined?
Do you mean the specifications of the pressure tapping stub left for the process? It is usually DN15