scope:

This European Standard specifies the tabulation method fordetermining the wall thickness of valve bodies, bonnets and coverswith essentially circular cross-section made in forged, cast orfabricated steel. For valve shells with oval, rectangular ornon-circular shapes, see 8.6. The range of PN or Class designationsfor which thicknesses are tabulated is: PN 2,5, PN 6, PN 10, PN 16,PN 25, PN 40, PN 63, PN 100, PN 160, PN 250, PN 320, PN 400, Class150, Class 300,Class 600, Class 900, Class 1500, Class 2500, Class4500. Pressure/temperature ratings are specified for each materialgroup for the above PN Standard Class and Special Classdesignations. The non-destructive examination procedures andacceptance levels that need to be applied to the valve shellcomponents in order for the valve to be used at Special Classpressure/temperature ratings are defined. Details are also givenfor the alternative rules for small bore valves of DN 65 andsmaller designated as Limited Class. This standard does not applyto threaded end valves: - DN 80 or larger; - or which have pressureratings greater than Class 2500; - or which operate at temperaturesgreater than 540 ?C. Socket welding end valves DN 80 or larger areoutside the scope of this standard.