Now in chemical, flange pn2.
It does not include the fluctuation pressure of the fluidDesign pressure refers to the maximum instantaneous pressure acting on the inner wall of a pipe system. Generally, the pressure of the work force and the sum of the residual water hammer pressure are usedNominal pressure is to design, manufacture and convenient use, a nominal pressure set artificially. The nominal pressure is the actual pressure unit, "pressure" is commonly known as the Chinese, unit is "Pa" instead of "N".
Must be noted that the new and old standard flange PN units are not the same! The old standard unit is the kg/cm facility. The unit is MPa. that is the old standard PN2.5 corresponding to the new standard PN0.25.
Nominal pressure PN (=2.5MPa):Reference value relating to the pressure resistance of piping system componentsWorking pressure is the maximum continuous running pressure acting on the inner wall of a pipe under normal working conditions.
