With the term “pressure”, a distinction needs to be drawn between terminology used by:
– the network designer (dependent on the hydraulic capacity),
– the manufacturer (dependent on the product performance),
– the network user (dependent on the service).
The terminology listed below is drawn from the draft European standard EN 805 – Water supply. Specification for external networks and components – applicable to all materials.
The product standard EN 545 - Ductile cast iron pipes and fittings - uses this terminology where the manufacturer is concerned.
|Mdp||Maximum design pressure|
|Stp||System test pressure|
|manufacturer||pfA||Allowable operating pressure|
|pMA||Allowable maximum operating pressure|
|peA||Allowable test pressure|
PN - Nominal pressure (in compliance with Standard EN 545)
Numerical designation expressed by a number used for reference purposes. All flanged components with the same DN and designated by the same PN are compatible for interconnection.
Standard EN 545 sets out for flanged pipes and fittings, the following PN equivalents in PFA, PMA and PEA.
|DN||PN 10||PN 16||PN 25||PN 40|
|40 to 50||See PN 40||See PN 40||See PN 40||40||48||53|
|60 to 80||See PN 16||16||20||25||See PN 40||40||48||53|
|100 to 150||See PN 16||16||20||25||25||30||35||40||48||53|
|200 to 300||10||12||17||16||20||25||25||30||35||40||48||53|
|350 to 1 200||10||12||17||16||20||25||25||30||35||–||–||–|
|1400 to 2000||10||12||17||16||20||25||–||–||–||–||–||–|
|For DN 80 flanged parts manufactured by PAM, use the following equivalents:|
|80||See PN 40||See PN 40||See PN 40||40||48||53|
Leaktightness test pressure (in the sense of Standard EN 545)
Pressure applied to a component during its manufacture to ensure its leaktightness.