Definition of nominal pressure in pressure pipelines
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What does the nominal pressure mentioned in this clause refer to? I only know that the flange is related to the engineering pressure; what does the nominal pressure of a pipe refer to? What is the relationship between it and working pressure and design pressure? Seeking advice
Nominal pressure, abbreviated as PN, refers to the maximum operating pressure that pressure pipelines and their accessories can withstand at specified operating temperatures. It is a pressure level representation that facilitates standardization, and is commonly used to indicate the design and manufacturing standards for equipment or piping components. The nominal pressure is different from the operating pressure under actual conditions (i.e., the pressure when the equipment is in use), and it is also different from the design pressure. The design pressure is usually higher than the nominal pressure, which provides a certain safety margin for safe operation. In short, nominal pressure is a theoretical reference standard, while operating pressure and design pressure are more related to actual application conditions. .
The nominal pressure here should refer to the nominal pressure of various pipe fittings (including flanges, valves, filters, etc.).