CSA 6.18:25

1 Scope 1.1 Inclusions This Standard applies to the construction, materials, performance, and testing of NPS 1-1/4 in (32 mm) and smaller self-acting service-type regulators with overpressure protection devices utilized to control the pressure of gas delivered to a customer’s piping at a delivery pressure of 2 psi (14 kPa) or less. 1.2 Temperature ratings This Standard includes regulators capable of operation over an ambient temperature range of -40 to 150 °F (-40 to 65.6 °C) up to the pressure recommended by the manufacturer but not exceeding 125 psi (861.8 kPa). 1.3 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. 1.4 Units of measurement The values given in U.S. customary units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only, or for markings where both units of measurement are required.