IAPMO IGC 297-2013a Pressure Relief Valves for Hot- and Cold-Water Distribution Systems
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1 Scope 1.1 This Standard covers pressure relief valves intended for installation in hot- and cold-water distribution systems and specifies requirements for materials, physical characteristics, performance testing, and markings. 1.2 The requirements of this Standard are not intended to prevent the use of alternative materials or methods of construction provided such alternatives meet the intent and requirements of this Standard. 1.3 In this Standard, (a) Ã¢ÂÂshallÃ¢ÂÂ is used to express a requirement, i.e., a provision that the user is obliged to satisfy to comply with the Standard; (b) Ã¢ÂÂshouldÃ¢ÂÂ is used to express a recommendation, but not a requirement; (c) Ã¢ÂÂmayÃ¢ÂÂ is used to express an option or something permissible within the scope of the Standard; and (d) Ã¢ÂÂcanÃ¢ÂÂ is used to express a possibility or a capability. Notes accompanying sections of the Standard do not specify requirements or alternative requirements; their purpose is to separate explanatory or informative material from the text. Notes to tables and figures are considered part of the table or figure and can be written as requirements.