What is the Maximum Operating Pressure (MOP)?
Before introduction of the European standard the internal pressure load capacity of PE pressure pipes and fittings was indicate by the nominal pressure stages of a pipe in terms of a PN rating. For instance, pipes rated PN 6 meant that the permissible internal pressure load capacity of the pipe was 6 bar for water at a temperature of 20°C over a lifespan of 50 years. According to the present European standard, the designation (PN) is replaced by the designations (SDR) or (ISO-S). The permissible internal pressure load capacity or maximum operating pressure of PE pipes (PE80, PE100) is based on variable safety factors SF = 1.25 (for water supply pipes) and SF = 2.0 (for gas pipes).
