According to SH/T 3005-2016, the pressure rating of the valve body should not be lower than PN20; does this mean that metric standards cannot be used?
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Points 10.1.7 b) and 10.3.2.3 of the SH/T 3005-2016 standard require that the design and manufacture of the valve body shall comply with ASME B16.34 or equivalent Chinese standards; the pressure class of the valve body shall not be lower than PN20 (CASME CL150). The design pressure, design temperature, material, and corrosion resistance of the valve body and its accessories shall not be inferior to those specified for the piping materials, and all pressure-bearing components shall meet the requirements of the pipeline design conditions. In domestic projects that use the metric system, most pipelines are of PN16 grade. Does this mean that in future metric-based projects, petrochemical standards will no longer be applicable?
Each project has its own unified design regulations, which should specify whether a particular discipline within that project should follow American standards or Chinese standards, or indicate a specific standard number.
It should be like this, using HG or GB standards.
The metric standard should use a pressure rating of 25 (bar).