NEN EN 14141 : 2013

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Functional requirements
  4.1 Travel stops
  4.2 Position of the obturator
  4.3 Protection of exposed stems and shafts
  4.4 Piggability
  4.5 Lifting lugs
  4.6 Additional requirements
5 Requirements and tests
  5.1 Design
      5.1.1 Shell
      5.1.2 End-to-end dimensions
      5.1.3 Butt welding ends
      5.1.4 Anti-blow-out feature
      5.1.5 Sealant injection systems
      5.1.6 Extended drain, vent and sealant lines
      5.1.7 Vent, drain and sealant valves
      5.1.8 Mechanical resistance against excessive
            actuating forces
      5.1.9 Body/bonnet connection
  5.2 Operation
      5.2.1 Handwheels and levers, ease of operation
      5.2.2 Protection against rapidly moving external
            components
      5.2.3 Manual override devices
      5.2.4 Torque/thrust testing
  5.3 Materials
      5.3.1 Material compatibility
      5.3.2 Shell materials
      5.3.3 Obturator
      5.3.4 Body/bonnet connection, bolting materials
  5.4 Repair
  5.5 Non-destructive testing
      5.5.1 Qualification of testing personnel
      5.5.2 Welding
      5.5.3 Castings
      5.5.4 Forgings
      5.5.5 Welding ends for on-site welding
  5.6 Shell test
  5.7 External tightness
      5.7.1 Stem/shaft sealing
      5.7.2 External pressure relief
      5.7.3 Fire test (optional if requested)
  5.8 Internal tightness
      5.8.1 Seat tightness
      5.8.2 Functional test on clean service (optional)
      5.8.3 Abrasion resistance test on dirty service
            (optional)
6 Certification
7 Quality
8 Type tests
9 Functional and other qualification tests
Annex A (normative) Type test on general design and
        production of pipeline valves
  A.1 General
  A.2 Purpose
  A.3 Type test qualification limits
      A.3.1 Size range
      A.3.2 Design
      A.3.3 Material
      A.3.4 Type of manufacture
  A.4 Type test
      A.4.1 Prerequisites for manufacturing
      A.4.2 Stress evaluation and safety design check
      A.4.3 Test on valves
      A.4.4 Documentation
  A.5 Check on the production and testing by the
      independent accepted body
  A.6 Modification of valves with type mark
      A.6.1 Revisions to this standard
      A.6.2 Notification of modifications
  A.7 Procedure
      A.7.1 Application for type test
      A.7.2 Test report
      A.7.3 Type mark
  A.8 Notification of valves with type mark
      A.8.1 Approvals
      A.8.2 Expiry
      A.8.3 Specimen of declaration of obligation
Annex B (normative) Functional test on behaviour of
        valve sealing materials towards liquids in
        natural gas
  B.1 Purpose
  B.2 Performance of test
  B.3 Acceptance criteria
Annex C (normative) Strength test on torque/thrust
  C.1 Purpose
  C.2 Performance of test Acceptance criteria
Annex D (normative) Functional test on clean gas (on
        option)
  D.1 Purpose
  D.2 Performance of test
  D.3 Acceptance criteria
Annex E (normative) Functional test for abrasion
        resistance to dirty service of ball valves (on
        option)
  E.1 Purpose
  E.2 Performance of test
  E.3 Acceptance criteria
Annex F (normative) Wall thickness measurement
  F.1 Purpose
  F.2 Description of test
  F.3 Test method
  F.4 Acceptance criteria
Annex G (informative) Additional requirements
  G.1 Bending strength
  G.2 Protection against excessive torques
Annex H (informative) Summary of tests on product and
        type tests
Bibliography

Specifies all valves (plug valves, ball valves, gate valves and check valves) used in onshore transmission pipelines for transport of natural gas in accordance with EN 1594.