AWWA C700-20 pdf download.Cold-Water Meters—Displacement Type, Metal Alloy Main Case
4.1.3 Register-box rings and lids. Register-box rings and lids shall be made of a copper alloy containing not less than 57 percent copper, such as UNS C85700 or UNS C86200, or a similar copper alloy as listed in ASTM B584 or UNS C85800 as listed in ASTM B176; or a suitable engineering plastic, such as polycarbonate (PC) in accordance with ASTM D3935, acetal in accordance with ASTM D4181, nylon (PA) in accordance with ASTM D4066, or propylene in accordance with ASTM D4101.
Materials used in the construction of register-box rings and lids shall have sufficient dimensional stability to retain operating clearances at working temperatures up to 105°F (40°C) and shall not permanently warp or deform when exposed to temperatures up to 150°F (66°C) for 1 h.
4.1.6 Measuring-chamber diaphragms. Measuring-chamber diaphragms shall be made of monel, such as UNS N04400 as listed in ASTM B127; phosphor bronze as listed in ASTM B103; or austenitic stainless steel as listed in ASTM A167; or a suitable engineering plastic, such as PA in accordance with ASTM D4066, PPS in accordance with ASTM D4067, PPO in accordance with ASTM D2874, or SAN in accordance with ASTM D4203. Measuring-chamber diaphragms shall have sufficient dimensional stability to retain operating clearances at working temperatures up to 80°F (27°C) and shall not warp or deform when exposed to operating temperatures of 100°F (38°C).
4.1.7 Piston/disc spindles, thrust rollers, and thrust-roller bearing plates. Piston/disc spindles, thrust rollers, and thrust-roller bearing plates shall be made of monel UNS N04400 in accordance with ASTM B164; phosphor bronze in accordance with ASTM B139; austenitic stainless steel as listed in ASTM A276; or a suitable engineering plastic, such as PC in accordance with ASTM D3935, PPS in accordance with ASTM D4067, or thermoplastic polyester (TPES) in accordance with ASTM D4507. Piston/disc spindles, thrust rollers, and thrust-roller bearing plates shall have sufficient dimensional stability to retain operating clearances at working temperatures up to 80°F (27°C) and shall not warp or deform when exposed to operating temperatures of 100°F (38°C).AWWA C700-20 pdf download.