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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
  4.1 Pressure ratings for valves
      4.1.1 General
      4.1.2 Valves without indicated flow direction
  4.2 Service temperatures for valves
  4.3 Steel parts
      4.3.1 Valve Body
      4.3.2 Valve steel pipe
      4.3.3 Welding ends
      4.3.4 Welding
  4.4 Casing
      4.4.1 General
      4.4.2 Requirements for polyethylene welding
      4.4.3 Diameter and wall thickness of the casing
  4.5 Polyurethane rigid foam insulation (PUR)
      4.5.1 General
      4.5.2 Minimum insulation thickness
  4.6 Valve assembly
      4.6.1 Ends of valve assembly
      4.6.2 End of stem construction
      4.6.3 Tolerances on the main dimensions
      4.6.4 Installation of measuring elements
  4.7 Requirements for effective operation and
      maintenance
  4.8 Resistance to axial forces and bending moments
5 Testing, test methods and test requirements
  5.1 General
  5.2 Test specimens
      5.2.1 General
      5.2.2 Test specimens for type testing steel
            parts of valve
      5.2.3 Test specimens from casings and
            polyurethane foam
  5.3 Steel parts
      5.3.1 Type test
      5.3.2 Leak-tightness of shell and stem casing
      5.3.3 Leak-tightness of the seat
      5.3.4 Torque load measurement of unloaded
            valve
      5.3.5 Axial compressive force test
      5.3.6 Axial tensile force test
      5.3.7 Bending test
      5.3.8 Testing of steel welds
  5.4 Casing
      5.4.1 General
      5.4.2 Leak-tightness of the welded casing
  5.5 Polyurethane rigid foam insulation
  5.6 Valve assembly
  5.7 Surveillance system
  5.8 Leak testing of valves
6 Marking
  6.1 General
      6.1.1 Steel valve
      6.1.2 Casing
      6.1.3 Valve assembly
7 Installation and maintenance
Annex A (informative) - Guidelines for inspection
        and testing
Annex B (normative) - Resistance to axial force
        and bending moment
Annex C (normative) - Resistance to bending forces