Standards Development

Scope

This document establishes requirements for newly produced compressed hydrogen gas fuel system components, as listed below, that are intended for use on hydrogen gas powered rail vehicles:

a)       check valves (see Clause 8);NOTE 1 — Check valves that are already type approved according to UN GTR No. 13 or UN Regulation No. 134 do not need to be retested according to all clauses of this document. To prove their suitability to rail applications, the manufacturer may apply the rail specific requirements specified in 4 and 5. This may typically be the case for criteria such as fire and smoke (refer to 4.1.2.2), shock and vibration (refer to 5.13).

b)       manual valves (see Clause 9);

c)        manual container valves (see Clause 10);

d)       automatic valves and automatic container valves (see Clause 11);NOTE 2 — Automatic container valves that are already type approved according to UN GTR No. 13 or UN Regulation No. 134 do not need to be retested according to all clauses of this document. To prove their suitability to rail applications, the manufacturer may apply the rail specific requirements specified in 4 and 5. This may typically be the case for criteria such as fire and smoke (refer to 4.1.2.2), shock and vibration (refer to 5.13).

e)       hydrogen injectors (see Clause 12);

f)         pressure sensors, pressure switches, temperature sensors, and pressure gauges (see Clause 13);

g)       pressure regulators (see Clause 14);

h)       pressure relief valves (PRV) (see Clause 15);

i)         pressure relief devices (PRD) (see Clause 16, and refer to ISO 19882);

j)         excess flow valves (see Clause 17);

k)       gastight housing and leakage capture passages (see Clause 18);

l)         rigid fuel lines (see Clause 19);

m)     flexible fuel lines including for intercar connections, hoses, and hose assemblies (see Clause 20);

n)       filter assemblies (see Clause 21);

o)       fittings (see Clause 22);

p)       non-metallic, low-pressure rigid fuel lines (see Clause 23);

q)       discharge line closures (see Clause 24);

r)        Quick connectors (see Clause 25).

NOTE 3 — Other components not specifically identified here (e.g. flow restrictors, manifolds) can be assessed to meet the generic design criteria of clause 4 and tested according to clause 5 with adaptations appropriate to the functional needs.

The document references ISO 19887-1 for the main hydrogen component requirements and focuses on the specific details applicable to rail vehicle applications.This document applies to components incorporated into hydrogen fuel systems specified in IEC 63341-2 that have a nominal working pressure, as specified by the manufacturer, of 35 MPa, or 70 MPa at 15 °C, referred to in this document as the following pressure classes:

a)       “H35” – 35 MPa;

b)       “H70” – 70 MPa.

Nominal working pressures other than those defined may be used, provided the qualification test requirements of this document are met.

This document also applies to components downstream of the first stage of pressure reduction with a maximum operating pressure designated by the manufacturer in MPa or kPa.This document does not apply to the following:

a)       fuel containers;

b)       stationary power generation applications;

c)        container mounting hardware;

d)       electronic fuel management;

e)       components intended for liquid hydrogen, or

f)         refuelling receptacles.NOTE — Refuelling receptacle are typically designed and validated according to dedicated standard such as the ISO 17268 series. Rail specific requirements specified in 4 and 5 may be applied also to refuelling receptacles to prove their suitability to rail applications. This may typically be the case for criteria such as fire and smoke protection (refer to 4.1.2.2), corrosion resistance (refer to 5.7.2), shock and vibration (refer to 5.13).