AWWA C710:2002 pdf download.Cold-Water Meters-- Displ acement Type, Plastic Main Case
Sec. 1.1 Scope
This standard describes the various types and classes of cold-water displacement meters with plastic main cases, in sizes 1/2 in. (13 mm) through 1 in. (25 mm), for water utility customer service, and the materials and workmanship employed in their fabrication. The displacement meters described, known as nutating-disc or osillaing- piston meters, are positive in action because the pistons and discs displace or carry over a fixed quantity of water for each nutation or oscillation when operated under positive pressure.
Sec. 1.2 Purpose
The purpose of this standard is to provide purchasers, manufacturers, and suppliers with the minimum requirements for cold-water meters- -displacement type, plastic main case, including materials and design.
Materials shall comply with the requirements of the Safe Drinking Water Act and other federal, state, and local requirements. Legislation is subject to change. Therefore, it is the manufacturer's and purchaser's responsibility to verify the current requirements of federal, state, and local regulations.
4.1.1 General. All materials used in the manufacture of water meters shall conform to the requirements stipulated in the following sections. Where plastic materials are allowed, the manufacturer may provide any plastic materials that meet the performance requirements specified; typical examples are provided.
4.1.1.1 Materials." Materials shall be selected for their strength and resis- tance to corrosion and shall not impart to the water objectionable taste or odor, nor toxic substances in normalized concentrations exceeding the maximum contaminant levels MCLs) as defined by the US Environmental Protection Agency (USEPA). If engineering plastic materials are used, only virgin or first generation grade, rigid engineering plastic materials shall be used in the manufacture of the pressure casing, covers, and bottoms, and these engineering plastic materials shall be compounded with ultraviolet stabilizers.
4.1.2 Pressure casings. Water meter main cases shall be made of a virgin- grade, rigid, and reinforced engineering plastic, such as polycarbonate (PC) per ASTM D3935, polyphenylene oxide (PPO) per ASTM D2874, or nylon (N) per ASTM D4066.AWWA C710 pdf download.AWWA C710 pdf download.