CSA/ANSI Z21.107:24

1 Scope 1.1 Application and material requirements for gas thermal shutoff devices This Standard applies to gas thermal shutoff devices constructed entirely of new unused parts and materials intended for use after the service meter or second stage regulator, hereinafter referred to as “devices”, ranging from 3/8 in (DN 10) up to 6 in (DN 150) nominal pipe size. 1.2 Automatic gas flow shutoff devices Devices covered by this Standard automatically shut off the gas flow when they reach a set temperature. This is a single use control. 1.3 Application of devices for use with natural or propane gas This Standard applies to devices for use with natural or propane gas, at pressures not to exceed 72 psi (496 kPa). 1.4 Ambient temperatures Unless otherwise specified, all tests specified herein are conducted at the ambient temperatures specified by the manufacturer as follows: a) at ambient temperatures of 32 °F (0 °C) and 158 °F (70 °C) if the manufacturer’s specified temperature range is from 32 °F (0 °C) to 158 °F (70 °C) and for indoor use only devices; or b) at ambient temperatures of -20 °F (-29 °C) and 158 °F (70 °C) if the manufacturer’s specified temperature range is from -20 °F (-29 °C) to 158 °F (70 °C); c) at ambient temperatures of -40 °F (-40 °C) and 158 °F (70 °C) if the manufacturer’s specified temperature range is from -40 °F (-40 °C) to 158 °F (70 °C). 1.5 Compliance of non-gas thermal shutoff device components with applicable standards Components performing functions other than those of a gas thermal shutoff device are to comply with applicable American National Standards or Canadian Standards. 1.6 Reference to pressure measurements All references to pressure throughout this Standard are to be considered gauge pressures, unless otherwise specified. 1.7 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 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 (mandatory) or informative (non-mandatory) to define their application. 1.8 Units of measure The values given in US customary units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.