NEN EN 13799 : 2012

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Operating conditions
5 Materials
   5.1 General
   5.2 Metallic materials
   5.3 Non-metallic components
   5.4 Lubricants, sealants and adhesives
6 Design - General requirements
   6.1 General
   6.2 Seals
   6.3 Springs
   6.4 Threads
   6.5 Flanges
7 Design - Specific requirements
   7.1 Contents gauge
        7.1.1 Float gauge
        7.1.2 Rotary gauge
        7.1.3 Fixed level gauge
        7.1.4 Slip tube gauge
        7.1.5 Other contents gauges
   7.2 Dials for contents gauges
   7.3 Overfill protection device
8 Design testing
   8.1 General
   8.2 Over-torquing deformation test
   8.3 External tightness test
   8.4 Internal tightness test
   8.5 Endurance test
   8.6 Hydrostatic strength test
   8.7 Stress cracking test
        8.7.1 General
        8.7.2 Mercurous nitrate immersion test
        8.7.3 Moist ammonia air stress cracking test
   8.8 Float pressure test
   8.9 Dimensional inspection
   8.10 Function test
   8.11 Accuracy assessment
9 Production testing and inspection
10 Marking
11 Documentation
Annex A (normative) - Float gauge flange and gasket dimensions
Annex B (normative) - Special low temperature requirements for
                         gauges
Annex C (normative) - Taper thread dimensions
Annex ZA (informative) - Clauses of this European Standard addressing
                         essential requirements or other provisions
                         of EU Directives