What is the pressure rating between the equipment, pipes, and valves?
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If the design pressure of the equipment is 0.3 MPa, what pressure rating should be chosen for the flange connected to the equipment? What pressure rating are required for the pipes connected to this flange, as well as the valves on those pipes? Are there any special circumstances? For example, the medium may be a flammable gas, corrosive, or prone to ignition and explosion, etc. I would appreciate some guidance from the experts here.
The pressure rating of a flange depends on the operating temperature; for the same pressure class, flanges used at different temperatures can have different maximum operating pressures. It is recommended that you consult the standards for chemical industry flanges, which specify the maximum operating pressure for flanges at various temperatures.
The pressure rating depends on various design requirements, and it is generally more than twice as high
Choose a pressure rating of 1.0MP or 0.6MP.
1.0 MPa should be chosen; there are more such products available, and their quality is also more stable. Moreover, in your case the medium might be a flammable gas, corrosive, or prone to ignition and explosion. National standards require products with a pressure of 1.0 MPa or higher