1.1
This Standard applies to manual lever operated gas shut-off valves, sizes NPS ¼ inch to 8 inch, of metallic construction with welded, or flanged, or threaded ends other than pressure lubricated designs for use with natural gas, manufactured gas, and liquefied petroleum gases (distributed as vapour with or without the admixture of air), or mixtures thereof that are suitable for use between service temperatures of -60 °C to 180 °C (-76°F to 356°F) over a pressure range of 0 to 860 kPa (125 psig) and that withstand field pressure testing to a maximum permissible pressure of 1290 kPa (187 Psig).
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 to be 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(s).
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 through 9.
Clause 5 -30 °C to 65 °C (-22°F to 149°F)
Clause 6 -40 °C to 65 °C (-40°F to 149°F)
Clause 7 -60 °C to 65 °C (-76°F to 149°F)
Clause 8 -30 °C to 120 °C (-22°F to 248°F)
Clause 9 -30 °C to 180 °C (-22°F to 356°F)
1.3
All references to psi (kPa) throughout this Standard are considered as gauge pressure unless otherwise specified.
1.4
This Standard contains SI (Metric) units corresponding to the yard/pound quantities, the purpose being to allow the standard to be used in SI (Metric) units. (IEEE/ASTM SI 10, American National Standard for Metric Practice, or ISO 80000-1:2009, Quantities and units – Part 1: General, is used as a guide in making metric conversion from yard/pound quantities.) If a value for a measurement and a corresponding value in other units are stated, the first stated value is to be regarded as the requirement. The given corresponding value may be approximate. If a value for a measurement and a 9corresponding value in other units are both specified as a quoted marking requirement, the first stated unit, or both, are to be provided.
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.