Selection of the nominal pressure for pipe fittings
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Should the nominal pressure of pipe fittings be one grade higher than the design pressure of the pipeline? What standards dictate this?
No standards are needed! Can’t it be used if it’s too low?
There is no such thing as a grade for design pressure; the nominal pressure is sufficient to encompass the design pressure
With a design pressure of 1.4 Mpa, it is definitely necessary to choose valves with a pressure rating of 1.6 Mpa. With a design pressure of 1.6, 2.5 is generally chosen
I really didn’t pay attention to what standard was used as the basis. Generally, considerations are made for safety reasons; of course, there is no need to design for 2.0 Mpa, nor is it necessary to use valves weighing 25 kilograms – 40-kilogram valves must be used instead.