NEN EN 12308 : 1998

Foreword
1 Scope
2 Normative references
3 Definitions
    3.1 liquefied natural gas (LNG)
    3.2 nominal diameter (DN)
    3.3 nominal pressure (PN)
    3.4 NPS
    3.5 Class
    3.6 Class of pressure
    3.7 Ps (allowable pressure)
    3.8 Required bolting load Fa
4 Design specifications of tested gaskets
5 Technical documentation by the gasket manufacturer
6 Check of compatibility between bolting load and
    mechanical strength of joint components
    6.1 Compatibility with flanges
    6.2 Compatibility with bolting
7 Means and equipment required for testing
    7.1 Test rig
    7.2 Measuring equipment
8 Testing
    8.1 Application of bolting load
    8.2 Leak testing at ambient temperature
    8.3 Leak testing at cold temperature
9 Acceptance criterion
10 Test report
Annex A (informative) Thermo-mechanical behaviour of a
flanged joint with gasket
Annex B (informative) Test rig
Annex C (normative) Method for verifying the bolting load
Annex D (normative) DN equivalence for tests
Annex E (normative) PN equivalence for tests

Defines tests carried out so as to assess the suitability of gaskets designed for flanged joints used on LNG pipes. Applies for gaskets with: Nominal pressure range from PN 16 to PN 100 Nominal diameter range from DN 10 to DN 1000 Class range from Class 150 to 900 Nominal diameter range for Class flanges from NPS 1/4 to NPS 42