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This document specifies minimum requirements for the materials, design, construction, prototype testing and routine manufacturing inspections of composite gas cylinders and tubes for compressed hydrogen. NOTE 1 Unless specified in the text, for the purposes of this document, the word “cylinder” includes tubes. This document applies to - fully wrapped composite cylinders (Type 3 and Type 4) - hoop wrapped cylinders (Type 2) with carbon fibres intended to be permanently mounted in a frame (e.g. bundle or trailer) with a test pressure of not less than 300 bar, with: — non-metallic liners (for Type 4) or seamless metallic liners (for Type 2 and Type 3), — a maximum water capacity of 3 000 l — a maximum working pressure of 1 000 bar. — the product of working pressure times water capacity (p x V) not exceeding 1 000 000 bar.l. NOTE 2 A glass fibre protective layer is sometimes applied to the external surface of the cylinder

This document specifies design, type testing, marking and manufacturing tests and examinations requirements for:

a) self-closing cylinder valves;

b) self-closing cylinder valves with integrated pressure regulator (VIPR), which include VIPR designs where the primary valve operating mechanism is located upstream of the pressure regulating system (VIPR type A) and where the primary valve operating mechanism is located at the low-pressure side of the pressure regulating system (VIPR type C);

used for refillable transportable gas cylinders which convey compressed, liquefied or dissolved gases.

NOTE 1 The main applications for such self-closing cylinder valves are in the calibration gas and beverage industries.

NOTE 2 Where there is no risk of ambiguity, cylinder valves and VIPRs are addressed with the collective term “valves” within this document.

This document does not apply to:

— VIPR designs where the pressure regulating system is acting as the primary valve operating mechanism (VIPR type B) and designs where closure of the primary valve operating mechanism is obtained by closing the seat of the pressure regulating mechanism (such designs are covered by ISO 10297);

— valves for cryogenic equipment, portable fire extinguishers and liquefied petroleum gas (LPG);

— quick-release cylinder valves (e.g. for fire-extinguishing, explosion protection and rescue applications) - requirements for quick-release cylinder valves are specified in ISO 17871 which contains normative references to this document;

— ball valves.

NOTE 3 Requirements for valves for cryogenic vessels are specified in ISO 21011 and at a regional level, e.g. in EN 1626. Requirements for valves for portable fire extinguishers are specified at a regional level, e.g. in EN 3 series.

Requirements for self-closing LPG cylinder valves are specified in ISO 14245. Requirements for quick-release cylinder valves are given in ISO 17871. Requirements for ball valves are given in ISO 23826.

This document only covers the function of a valve as a closure.

NOTE 4 Other additional functions that can be integrated into the valve can be covered by other standards. Such standards do however not constitute requirements of this document.

NOTE 5 Definition of and specific requirements for VIPRs in addition to those given in this document are specified in ISO 22435 for industrial applications or ISO 10524-3 for medical applications. Similarly, certain specific additional requirements for residual pressure valves (RPV) are given in ISO 15996.