AWWA C704:2019 pdf download.Propeller-Type Meters for Waterworks Applications
4.1.2 Flow tubes or main cases. Flow tubes or main cases may be made of cast iron in accordance with ASTM A126, ASTM A159, or ASTM A536, or fabricated steel in accordance with ASTM A53 and ANSI/AWWA C200. The flow tubes or main cases may be protected by a corrosion-resistant coating or other anticorrosion treatments such as those described in ASTM A153, ANSI/ AWWA C210, and ANSI/AWWA C213.
4.1.3 Register boxes and covers. Register boxes and covers shall be made of a copper alloy containing not less than 57 percent copper, such as UNS C85800 in accordance with ASTM B176 or ASTM B584; cast iron in accordance with ASTM A48, ASTM A126, and ASTM A159; aluminum, such as UNS A03190 in accordance with ASTM B26 or ASTM B85; or a suitable engineering plastic, such as polycarbonate in accordance with ASTM D3935, nylon in accordance with ASTM D4066, propylene in accordance with ASTM D4101, or acetal in accordance with ASTM D4181. Register boxes and covers made of cast iron shall be protected with a corrosion-resistant coating.
4.1.4 Propellers. Propellers shall be made of suitable molded or cast material having sufficient rigidity and strength to operate at the maximum rated capacity of the meter. Propellers shall have a specific gravity as close as possible to that of water. They shall be of sufficient dimensional stability to retain operating clearance and not warp or deform when exposed to operating temperatures of 100°F (38°C). Representative materials include engineering plastics, such as polyethylene in accordance with ASTM D1248; propylene in accordance with ASTM D4101; nylon in accordance with ASTM D4066; polyphenylene oxide in accordance with ASTM D4067; or acrylonitrile–butadiene–styrene (ABS) in accordance with ASTM D4673.
4.1.7 Flow-straightening vanes and liners. Flow-straightening vanes (and liners when provided) shall be of corrosion-resistant material, such as suitable engineering plastic, including polycarbonate in accordance with ASTM D3935; polyphenylene oxide in accordance with ASTM D4067; or stainless steel in accordance with ASTM A167 Type 304; or other materials such as steel in accordance with ASTM A570 Grade A protected by corrosion-resistant treatment, such as fusion-bonded epoxy in accordance with ANSI/AWWA C213.AWWA C704 pdf download.