scope:

This standard contains safety requirements for the design, manufacture and testing of fueling hose breakaway devices for use in hydrogen gas fueling applications , hereinafter referred to as devices. This standard applies to newly manufactured devices.

This standard does not apply to:

a. Residential Fueling Facility and/or Vehicle Fueling Appliances for hydrogen gas vehicles.

b. Dispenser Breakaway Devices (Shear Valves)

c. Vehicular Breakaway Components

Devices covered by this standard are intended to perform the following functions when a vehicle is driven off with the nozzle attached to the vehicle's fueling receptacle.

a. Minimize the escape of gaseous hydrogen by automatically shutting off the flow of gas from the dispenser and controlling the depressurization of the hose; and

b. Minimize damage to the vehicle and dispenser.

All dimensions used in this standard are in metric units [International System of Units (SI)], unless otherwise specified. If a value for a measurement, as given in this standard, is followed by an equivalent value in other units, the first stated is to be regarded as the specification.

All references to pressure throughout this document are to be considered gauge pressures unless otherwise specified.

Except as otherwise stated, testing at room temperature will be conducted between 15°C (59°F) minimum and 30°C (86°F) maximum.