Instrument process connection pressure rating
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May I ask, what pressure rating should be used for the connections during the installation of piping instruments (throttle devices, flow meters, control valves, etc.) in order to meet the requirements specified in the piping material grade table?
What do you mean? The pressure rating is specified by the manufacturing process; we just need to choose one that can accommodate it... Refer to national standards
Only the pressure rating needs to be considered; it should be the same as or higher than that of the pipeline. . However, when it comes to pipeline grade tables, the material issue often still needs to be taken into consideration.