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CGA G-5.45th Edition, January 1, 2012Complete DocumentSTANDARD FOR HYDROGEN PIPING SYSTEMS AT USER LOCATIONS
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![]() Description / Abstract:
This standard describes the specifications and general
principles recommended for piping systems for gaseous (Type I) or
liquid (Type II) hydrogen. The standard addresses both low and high
pressure hydrogen piping systems onsite from the point where
hydrogen enters the distribution piping (the battery limits of the
hydrogen storage system) to the point of use. For the purposes of
this standard, high pressure is defined as gaseous hydrogen at
service pressures equal to or greater than 3000 psig (20 680
kPa).1, 2
The information in this standard is general in nature and is intended for designers, fabricators, installers, users, and maintainers of hydrogen piping systems as well as for safety personnel, fire departments, building inspectors, and emergency personnel. Basic information on the properties, storage, and handling of hydrogen can be found in CGA G-5, Hydrogen; CGA G-5.3, Commodity Specification for Hydrogen; National Fire Protection Association (NFPA) 52, Vehicular Gaseous Fuel Systems Code; NFPA 55, Compressed Gases and Cryogenic Fluids Code; and the CGA Handbook of Compressed Gases [2, 3, 4, 5, 6]. 1 kPa 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. ![]() |