ANSI Z21.54:19/CSA 8.4:19 pdf free download.Gas Hose Connectors for Portable Outdoor Gas-Fired Appliances.
ANSI Z21.54:19/CSA 8.4:19 applies to gas hose connectors (See Clause 3 Definitions), hereinafter referred to as connectors. They are conduits for conveying gas and depend for gas-tightness on the wall structure of the hose material.
This Standard contains SI(Metric) equivalents to the yard/pound quantities, the purpose being to allow the standard to be used in SI(Metric)units. (IEEE/ASTM SI 10 is used as a guide in making metri conversion from yard/pound quantities. If a value for a measurement and an equivalent value in other units, the first stated is to be regarded as the requirement. The given equivalent value may be approximate. If a value for a measurement and an equivalent value in other units, are both specified as a quoted marking requirement, the first stated unit, or both shall be provided.
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 from 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( mandator )or informative (non-mandatory) to define their application.
PS:Due to copyright issues, this standard file cannot be downloaded. so sorry.