NEN EN ISO 11439 : 2013

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Service conditions
5 Approval and certification
6 Requirements for type CNG-1 metal cylinders
7 Requirements for type CNG-2 hoop-wrapped cylinders
8 Requirements for type CNG-3 fully-wrapped cylinders
9 Requirements for type CNG-4 all-composite cylinders
10 Marking
11 Preparation for dispatch
Annex A (normative) Test methods and criteria
Annex B (normative) Ultrasonic inspection
Annex C (informative) Approval and certification procedures
Annex D (informative) NDE defect size by flawed cylinder
                      cycling
Annex E (informative) Report forms
Annex F (informative) Environmental test
Annex G (informative) Verification of stress ratios using
                      strain gauges
Annex H (informative) Manufacturer's instructions for
                      handling, use and inspection of
                      cylinders

Defines minimum requirements for serially produced light-weight refillable gas cylinders only for the on-board storage of high pressure compressed natural gas as a fuel for automotive vehicles to which the cylinders will be fixed. Service conditions do not cover external loadings arising from vehicle collisions etc. Covers cylinders of aluminium, steel or non-metallic material construction using any design or method of manufacture suited to the specific service conditions. Does not cover cylinders of stainless steel or welded construction.