AWWA C713-15 pdf download.Cold-Water Meters— Fluidic-Oscillator Type
4.1.5 Covers, top or bottom. If engineering plastic materials are used in the manufacture of top or bottom covers, only virgin or frst-generation–grade rigid engineering plastic materials compounded with ultraviolet stabilizers shall be used. Engineering plastic covers, top or bottom, shall have sufcient dimensional stabil- ity to maintain a seal 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 hr. Breakable and nonbreakable top or bottom covers shall be as follows:
4.1.5.1 Nonbreakable. Nonbreakable covers shall be made of austenitic stainless steel, such as those listed in ASTM A167; a copper alloy containing not less than 75 percent copper if wetted, such as UNS C89510, C89520, C89833, or C89836, or a similar copper alloy as listed in ASTM B584; a copper alloy containing not less than 57 percent copper if nonwetted, such as UNS C85700 or UNS C86200 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, polyphenylene sulfde (PPS) in accordance with ASTM D4067, nylon (PA) in accordance with ASTM D4066, or thermoplastic poly- ester (TPES) in accordance with ASTM D5927. Te design and composition of these components shall be such that they will satisfy the break or yield require- ments stated in Sec. 4.2.9.
4.1.5.2 Breakable. Breakable covers (frost-protection devices) shall be made of cast iron, such as those listed in ASTM A48, ASTM A126, or ASTM A159; austenitic stainless steel, such as those listed in ASTM A167; a copper alloy containing not less that 75 percent copper, such as UNS C89510, C89520, C89833, or C89836, or a similar copper alloy as listed in ASTM B584; or a suit- able engineering plastic, such as polycarbonate (PC) in accordance with ASTM D3935, polyphenylene sulfde (PPS) in accordance with ASTM D4067, nylon (PA) in accordance with ASTM D4066, or thermoplastic polyester (TPES) in accor- dance with ASTM D5927. See Sec. 4.2.9 for fatigue limits and burst pressure. If employed, full polymer liners shall prevent exposure to metered water.AWWA C713-15 pdf download.