C710-88: AWWA Standard for Cold-Water Meters--Displacement Type, Plastic Main Case (PDF)
SKU: STC_0027648-PDF
This standard covers the various types and classes of cold-water displacement meters with plastic main cases in sizes 5/8 in. through 1 in., for water utility customer service, and the materials and workmanship employed in their fabrication. The displacement meters covered, known as nutating-disc or oscillating-piston meters, are positive in action in that pistons and discs displace or carry over a fixed quantity of water for each nutation or oscillation when operated under positive pressure.
Description
The history of the standard, information regarding use of this standard, highlights of this standard, developing technology and metrication are covered in the foreword. Section 1 discusses scope, definitions, references, affidavit of compliance, and basis for rejection. Section 2 on materials discusses pressure casing, register-box rings and lids, measuring chambers, pistons and discs, measuring-chamber diaphragms, piston/disc spindles, thrust rollers, and thrust-roller bearing plates, register gear trains, covers, top or bottom, external case closure fasteners, and coupling tailpieces and nuts. Section 3 covers general design including size, capacity, length, pressure requirement, plastic meter pressure casing, cover, and bottom design, frost-protection devices, external case closure fastenings, registration accuracy, and markings. Section 4 on detailed design covers main casing, connections, registers, measuring chambers, pistons and discs, strainers, and tamper-resistant features. The appendix includes supplemental information on units of measurement, tests, testing equipment, registration accuracy, periodic tests, meter storage, materials, and installation.