For piping to supply water at a temperature of 20°C without any particular constraints, the operating pressure [maximum service pressure (MSP) or allowable operating pressure (AOP)] is equal to NP.
AOP (MSP) = fT × fA × NP
When the PE piping system operates at constant pressure that is continuously greater than 20°C, a decalibration coefficient, fT, must be applied. For water transportation, fA is equal to 1.
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