Hydrogen-dispensing systems

1.1

This Standard specifies mechanical and electrical requirements for hydrogen dispensers intended to fuel light-duty, medium-duty, heavy-duty land vehicles.

Dispensing systems covered by this Standard include

a) dispensers of compressed hydrogen gas intended for fuel storage systems integral to land vehicles with nominal working pressure of 35 and 70 MPa;

b) dispensers of cryogenic hydrogen intended for cryo-compressed (CcH2) fuel storage systems integral to land vehicles with a nominal working pressure of 35 MPa; or

c) dispensers of cryogenic hydrogen intended for subcooled liquid hydrogen (sLH2) fuel storage systems integral to land vehicles with a nominal working pressure up to 1.6 MPa.

Each dispensing system could have multiple valve trains allowing fuelling of multiple vehicles, or fuelling of vehicles with dual receptacles.

This standard includes support for dispensers

a) that integrate all dispensing system components in a single unit, as needed, including fuel metering and registering, flow control and safety management devices, heat exchangers, and vehicle fuel cylinder over-fill and over-pressure protection with listed breakaway, hose(s) and nozzles (see Figure A.1); and 

b) systems that are primarily the customer facing unit with operator interface, and fueling hose assembly and including components as needed: listed breakaway, hose(s) and nozzles, and where the key components of flow metering, cooling and over-pressure and over-fill protection are located in a separate units or as part of the hydrogen fuelling station system (see Figure A.2).

1.2

Dispensing systems covered by this Standard are intended for use with fuel quality requirements in SAE J2719 or ISO 14687.