AWWA C708-15 pdf download.Cold-Water Meters—Multijet Type
4.1.1 General. Materials used in the manufacture of water meters shall conform to the requirements stipulated in the following section. Where plastic materials are allowed, the manufacturer may provide any plastic materials that meet the performance requirements specifed; typical examples are provided.
4.1.1.1 Materials † shall be selected for their strength and resistance to cor- rosion and shall not impart to the water objectionable taste or odor, nor toxic sub- stances in normalized concentrations exceeding the maximum contaminant levels (MCLs) as defned by the US Environmental Protection Agency (USEPA). If engineering plastic materials are used, only virgin, or frst-generation– grade, rigid engineering plastic materials shall be used in the manufacture of the main casings, covers, and bottoms; these engineering plastic materials shall be compounded with ultraviolet stabilizers.
4.1.2 Main casings. Main casings shall be made of a copper alloy contain- ing not less than 75 percent copper, such as UNS C89510, C89520, C89833, or C89836, or a similar copper alloy as listed in ASTM B584; or a cast austenitic stain- less steel as listed in ASTM A351; or a suitable engineering plastic such as poly- carbonate (PC) in accordance with ASTM D3935, polyphenylene ether (PPE) in accordance with ASTM D4349, or nylon (PA) in accordance with ASTM D4066.
Materials used in the construction of meter main cases shall have sufcient dimensional stability to retain operating clearances at working temperatures of up to 105°F (40°C) and shall not permanently warp or deform when exposed to tem- peratures of up to 150°F (66°C) for 1 hr.
4.1.9 Coupling tailpieces and nuts. Coupling tailpieces and nuts shall be made of a copper alloy containing not less than 75 percent copper, such as UNS C84400 or C93200 for nuts and such as UNS C89510, C89520, C89833, or C89836 for tailpieces, or a similar copper alloy as listed in ASTM B584; or, when specified by the purchaser, of a suitable virgin-grade engineering plastic, such as PC in accordance with ASTM D3935, PA in accordance with ASTM D4066, or PPS in accordance with ASTM D4067.AWWA C708-15 pdf download.