1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Size
5 Material groups and material temperature limitations
6 Pressure/temperature (p/t) ratings
   6.1 General
   6.2 Standard rating
   6.3 Special rating
   6.4 Limited class
   6.5 Intermediate ratings
   6.6 Flanged ratings
7 Temperature effects
   7.1 High temperature
   7.2 Low temperature
   7.3 Fluid thermal expansion
8 Variances
   8.1 Safety valve operation
   8.2 Other variances
9 Dimensions
   9.1 Minimum wall thickness
   9.2 Inside diameter
   9.3 Minimum crotch strength
   9.4 Valve body necks
   9.5 Local areas
   9.6 Contours at body ends
   9.7 Additional metal thickness
10 Auxiliary connections
   10.1 General
   10.2 Pipe thread tapping
   10.3 Socket welding
   10.4 Butt-welding
   10.5 Bosses
   10.6 Compensation for larger openings
11 Requirements for special rating
   11.1 General
   11.2 Required examination
   11.3 Castings
   11.4 Forgings, bars, plates and tubular products
   11.5 Drop forgings
   11.6 Welded fabrication
   11.7 Defect removal and repair
12 End dimensions
   12.1 Flanged ends
   12.2 Butt welding ends
   12.3 Socket welding ends
   12.4 Threaded ends
   12.5 Intermediate rated socket welding and threaded ends
13 Marking
   13.1 Special rating valves
   13.2 Limited Class valves
   13.3 Intermediate rating valves
Annex A (informative) relationship between DN, NPS and pipe
        inside diameter Dni
Annex B (normative) Radiography procedure and acceptance
        standards
        B.1 Radiographic procedure
        B.2 Acceptance standards
Annex C (normative) Magnetic particle examination procedure
        and acceptance standards
        C.1 Procedure
        C.2 Acceptance standards
        C.3 Welds and fabrication welds
Annex D (normative) Liquid penetrant examination procedure
        and acceptance standards
        D.1 Procedure
        D.2 Acceptance standards
        D.3 Welds and fabrication welds
Annex E (normative) Ultrasonic examination procedure and
        acceptance standards
        E.1 Procedure for forgings and rolled or wrought material
        E.2 Procedure for castings
Annex F (informative) Methods for establishing pressure-
        temperature ratings
        F.1 General considerations
        F.2 Pressure/temperature ratings
Annex G (normative) Requirement for limited class valves in
        sizes DN 65 and smaller
Annex H (informative) Material groups
Bibliography
Annex ZA (informative) Clauses of this European standard
         addressing essential requirements or other
         provisions of EU Directives