CSA/ANSI HGV 4.10:21

1 Scope 1.1 General 1.1.1 Scope of this Standard This Standard specifies methods for testing and evaluating fittings for use with compressed hydrogen gas and hydrogen-rich gas mixtures. 1.1.2 Applicability of this Standard This Standard was developed primarily for hydrogen fuelling station applications. However, this does not preclude other industries from adopting this Standard for their own use. 1.2 Fitting types In this Standard, the term “fittings” includes connectors, stud ends for ports, tees, elbows, crosses, adaptors and manifold blocks. 1.3 Exclusions This Standard does not apply to stand-alone components, such as a) quick action couplings (i.e., quick connects), flanges, or weld fittings; and b) fittings for handling liquid hydrogen. 1.4 New vs. historical fitting designs This Standard is intended for new fitting designs and existing designs made with new materials. It is not intended for existing fitting designs with history of use, fittings made of existing materials with history of use, or fittings qualified by industry-recognized organizations (e.g., ASME, CGA, MSS, and SAE) for use in compressed gaseous hydrogen applications. Note: However, such exclusions do not preclude manufacturers from using this Standard for certification purposes for existing fitting configurations with history of use. 1.5 Precedence of requirements Application-specific standards supersede the requirements of this Standard. 1.6 Terminology In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application. 1.7 Dimensions The values given in SI units are the units of record for this Standard. The values given in parentheses are for information and comparison only. Unless otherwise stated, all pressures noted within this Standard are gauge pressures.