Two types of bulk hydrogen supply systems are covered in this document: liquid and gaseous.

A bulk gas hydrogen supply system is one that contains greater than 5000 scf (141.6 m3) of hydrogen. A bulk liquid supply system is one that contains greater than 500 gal (1890 L) of hydrogen. The requirements of this standard are limited to systems operating up to 15 000 psig (103.4 MPa).^{1, 2}

For a liquid system, hydrogen is stored in liquid form and can be delivered in liquid or gaseous form to the end user's requirement. Pumps and/or compressors may be used to increase the hydrogen pressure before it is delivered to the end user. Gas receivers may be used to store gaseous hydrogen before it is delivered to the end user. The system is still considered a bulk liquid system because the hydrogen is delivered from the hydrogen supplier to the storage system in liquid form.

For a gas system, hydrogen is delivered to the supply system, stored, and is delivered to the end user's requirement in gaseous form.

This standard applies to hydrogen supply systems containing any of the following equipment. Not all hydrogen systems include all the equipment listed. More details about hydrogen applications can be found in CGA G-5, Hydrogen [2].

Hydrogen supply systems include:

– cryogenic hydrogen storage tank, either aboveground or belowground;

– gas storage vessels, either aboveground or belowground;

– heat exchangers (including vaporizers);

– valves including manual and automatic isolation valves, check valves, and excess flow valves (EFVs);

– pressure control equipment including regulators and control valves;

– piping (pipe and tubing); – cryogenic pumps;

– cryogenic and warm gas compressors;

– snubbers and pulsation dampeners;

– monitoring and control systems including electrical and instrumentation; and

– hydrogen dispensing equipment.

The bulk hydrogen supply system terminates at the source valve (commonly referred to as the point where the gas supply first enters the supply line) or at a piece of equipment that utilizes the hydrogen gas. In most cases, the source valve is a shutoff valve (typically owned and maintained by the hydrogen supplier) at the end of the bulk hydrogen supply system.

Hydrogen dispensing equipment is not included in the definition of the bulk supply system. However, this document also provides guidance for hydrogen vehicle dispensing equipment installations.

¹ kPa (MPa) shall indicate gauge pressure unless otherwise noted as (kPa, abs) for absolute pressure or (kPa, differential) for differential pressure. All kPa values are rounded off per CGA P-11, Metric Practice Guide for the Compressed Gas Industry [1].

² References are shown by bracketed numbers and are listed in order of appearance in the reference section.

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