The nominal pressure is the pressure resistance at the reference temperature, the working pressure is the maximum pressure when the pipeline is safely in operation, the design pressure is the set maximum pressure, and the test pressure is the pressure of the strength test before leaving the factory.
1. Different meanings
The nominal pressure is also the nominal pressure, that is, the design pressure, which is also the maximum allowable pressure of the valve. Generally speaking, it is the value after the rounding of the design pressure. It indicates the pressure resistance of the product at the reference temperature.
The working pressure is the pressure that the valve needs to withstand under normal working conditions. It indicates the pressure that the pipe and pipe fittings withstand under normal conditions.
What is the difference between the nominal pressure and the working pressure of steel pipe pipelines?
2. Different units
The nominal pressure is indicated by PN, unit: MPa.
The working pressure is indicated by Pt.
3. Different temperatures
The reference temperature of nominal pressure: Different materials have different reference temperatures. For example, the base temperature of steel is 250°C.
Working pressure: t × 10 = the maximum working temperature of the product.
4. Different sizes
PN > Pt, the nominal pressure is greater than the working pressure.
EN10210 S355J2 Carbon Steel Seamless Tube
