C701-02: AWWA Standard for Cold-Water Meters--Turbine Type, for Customer Service (PDF)
SKU: STC_0056857-PDF
This standard describes the various classes of cold-water turbine meters in sizes 3/4 in. (20 mm) through 20 in. (500 mm) for water supply customer service and the materials and workmanship employed in their fabrication. The turbine meters described in this standard are divided into class I and class II meters. Both classes of meters register by recording the revolutions of a turbine set in motion by the force of flowing water striking its blades. Class I meters are the vertical-shaft and low-velocity, horizontal-shaft models. Class II meters are the in-line, horizontal-axis, high-velocity-type turbines characterized by lower head loss and a wider normal operating flow range than class I models.
Description
The major revisions to the standard in this edition include the following: the format has been changed to AWWA standard style; the acceptance clause (Sec. I.C) and the definitions of parties (Sec. 3) have been revised to approved wording; "soft" metric equivalents have been added in the text and tables; the scope of the standard has been expanded to include sizes 3/4-in. (20-mm) through 20-in. (500-mm) (Sec. 1.1); the References Section has been updated (Sec. 2); the Choice of Materials Section has been revised (Sec. 4.1.1); Sec. 4.1.2, Main Casings, has been expanded to include strainer main casings and fabricated steel has been added as a material with which main cases can be made; Sec. 4.1.2.1, Strainer Screen, has been added; Sec. 4.1.4, Measuring cages or chambers, cast-iron and fabricated steel, have been added as materials with which the measuring cages or chambers can be made; Table 1 has been expanded to include the operating characteristics for low velocity horizontal-type meters and vertical shaft-type meters separately, and has also been expanded to show the operating characteristics for 3/4 in. (20 mm) and 1 in. (25 mm) sizes of the class I vertical-shaft type turbine meters and 11/2-in. (40-mm), 14-in. (350-mm), 16-in. (400-mm), 18-in. (450-mm), and 20-in. (500-mm) sizes for the class II In-line (high-velocity) type turbine meters and the corresponding text has been updated to include these sizes as well; Table 2, Meter dimensions for class I and class II turbine-type meters, has been expanded to include dimensions for sizes 3/4 in. (20 mm), 1 in. (25 mm), 14 in. (350 mm), 16 in. (400 mm), 18 in. (450 mm), and 20 in. (500 mm), and the corresponding text has been updated to include these sizes as well; Table 3, Meter connections--companion flange dimensions, has been expanded to include dimensions for sizes 3/4 in. (20 mm), 1 in. (25 mm), 14 in. (350 mm), 16 in. (400 mm), 18 in. (450 mm) and 20 in. (500 mm), and the corresponding text has been updated to include these sizes as well; an alternative flange material, ANSI/AWWA C207, steel plate flange, class D, has been added for main-case connections for 3-in. (80-mm) through 20-in. (500- mm) sizes (Sec. 4.3.3.3) and for companion flanges for 3-in. (80-mm) through 20-in. (500-mm) sizes (Sec. 4.3.4.2); Table 4, Maximum indication on initial dial and minimum register capacity, has been updated to include sizes 3/4 in. (20 mm), 1 in. (25 mm), and 14 in. (350 mm) through 20 in. (500 mm); the Workmanship and Materials Section has been deleted (Sec. 1.5.2, C701-88); a requirement for the placement of the meter serial number on the meter case has been added (Sec. 6.1); and, Table A.1, Average recommended intervals between meter tests, has been expanded to include sizes 3/4 in. (20 mm), 1 in. (25 mm) and 14 in. (350 mm) through 20-in. (500-mm) sizes.