CSA 3.16:21

1 Scope 1.1 This Standard applies to manual lever operated, gas shut-off valves sizes NPS 1/4 to 8 of metallic construction with weld and flanged and threaded ends other than pressure lubricated designs for use with natural gas, manufactured gas, and liquefied petroleum gases. Notes: 1) Valves covered by this Standard may be used on “digester gas” (methane produced during sewage treatment) but because of entrained contaminants their use is subject to agreement between the manufacturer and the purchaser. 2) Valves covered by this Standard may not be used on “sour gas” (gas with entrained hydrogen sulphide) without modification(s). Manufacturers should be consulted for their recommendation. 1.2 All valves covered by this Standard will be limited as to the service temperature and/or special provisions in accordance with the following designations and descriptions in Clauses 5 to 9. a) Clause 5: –30 to 65 °C (–22 to 149 °F); b) Clause 6: –40 to 65 °C (–40 to 149 °F); c) Clause 7: –60 to 65 °C (–76 to 149 °F); d) Clause 8: –30 to 120 °C (–22 to 248 °F); and e) Clause 9: –30 to 180 °C (–22 to 356 °F). 1.3 This Standard applies to manual lever operated gas shut-off valves having maximum operating pressure over a range of 0 to 860 kPa (125 psig) and able to withstand field pressure testing to a maximum permissible pressure of 1290 kPa (187 psig). 1.4 All references to psi (kPa) throughout this Standard are considered as gauge pressure unless otherwise specified. 1.5 In this Standard, “shall” is used to express a requirement, i.e., a provision that the user shall 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. 1.6 The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.