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Wrench nut. The wrench nut on stem shall be 2 inches square with arrow cast on showing direction which valve is to turn to open.

Painting

Painting. All iron work, after being thoroughly cleaned, to be painted throughout with asphaltum varnish, or suitable paint, or dipped in suitable coating material.

Testing

Testing. Valves must be tested for leakage and distortion as follows: On double disc or made up gate type, the body of the valve shall be drilled and tapped with a hole for pipe and a removable plug inserted, through this hole a hydraulic pressure of 300 pounds per square inch shall be applied; the wedge shaped gate type by an hydraulic pressure of 300 pounds per square inch applied, first between one end and the gate, second between the opposite end and the gate, and third in the bonnet with gate open.

STANDARD SPECIFICATIONS FOR COLD WATER METERS DISC TYPE*

Cases. All meters shall have an outer case with a separate inner chamber in which the disc operates. The outer case for all 2-inch and smaller meters shall be of bronze composition. Cast-iron frost bottoms may be provided. The outer case for meters larger than 2 inch shall be of bronze composition or of cast iron protected by a non-corrosive treatment.

All meters shall have cast on them in raised characters the size and the model and the direction of the flow through the meter shall be properly indicated. Meters larger than 1-inch shall be designed for easy removal of all interior parts without disturbing the connections to the pipe line.

External bolts. All external bolts shall be made of bronze or of galvanized iron or steel. Nuts shall be designed for easy removal after having been long in service.

Registers. Registers may be either "round" or "straight" reading, indicating in cubic feet or gallons.

All parts of the registers shall be made of non-ferrous material. The maximum indication of the initial dial and the minimum capacity of the register, when indicating cubic feet, shall be as follows:

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All dials, including the initial dial, shall be subdivided into ten equal parts. All hands or pointers shall taper to a sharp point. They shall be accurately set and securely held in place.

Register boxes. Register boxes and lids shall be made of bronze composition or same material as the top case, with the name of the manufacturer cast on the lid in raised letters. The serial number of the meter shall be plainly stamped on the lid. If required, the serial number shall also be stamped on the case. The lid shall be recessed and shall lap over the box to prevent dirt from accumulating on the glass. The glass shall be inserted from the inside and

Adopted by the American Water Works Association, June 19, 1921; by the New England Water Works Association, September 14, 1921.

securely held in place without the use of putty or pins. All register compartments shall be provided with a water-escape hole inch in diameter, so placed that the change gear or registering mechanism cannot be tampered with.

Connections for §, 1, and 1 inch sizes. Spuds shall be thre aded, 1 and 11 inch respectively, male thread standard pipe size and so threaded that Briggs standard pipe thread ring gages may be screwed on by hand within one thread of through the gage.

Over-all lengths of meters, face to face of spuds, shall be:

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Couplings shall be made of bronze composition. Nuts shall be tapped, 1 and 1 inch respectively, straight thread, standard pipe size and so tapped that Briggs standard pipe thread plug gages may be backed into the nuts by hand, i.e., the size of the thread in the nut is the maximum size of the Briggs plug, but no larger. Tail pieces shall be threaded, and 1 inch respectively, male thread, standard pipe size and so threaded that Briggs standard pipe thread ring gages may be screwed on by hand, flush with the face of the gage. Over-all lengths of tail pieces shall be:

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Connections for 1 and 2 inch sizes. Spuds shall be tapped 1 and 2 inches respectively, female thread, standard pipe size, and so tapped that Briggs standard pipe thread plug gages may be screwed on by hand up to the notch on the plug.

Over-all lengths of meters, face to face of spuds, shall be:

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Couplings shall be made of bronze composition. Nuts shall be tapped 2 and 2 inches respectively, straight thread, standard pipe size and so tapped that Briggs standard pipe thread plug gages may be backed into the nuts by hand,

i.e., the size of the thread in the nut is the maximum size of the Briggs plug, but no larger. Tail pieces shall be threaded 1 and 2 inch respectively, male thread, standard pipe size and so threaded that Briggs standard pipe thread ring gages may be screwed on by hand flush with the face of the gage. 2 by 11inch and 2 by 2-inch standard pipe size malleable iron bushings are to be furnished with 14-inch and 2-inch couplings respectively. Care shall be taken to see that nuts as above described can be screwed on to the bushings by hand and that the face of the bushings will be sufficiently true and square to provide a proper packing surface.

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Connections for 3, 4 and 6 inch sizes. Spuds shall be flanged, faced and drilled. Companion flanges shall be of cast iron, faced, drilled and tapped. All dimensions, drilling and tapping shall conform exactly to American standard of January 1, 1914.

Over-all lengths of meters, face to face of flanges, shall be:

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Seal wire holes. §, 1, 1, 1 and 2-inch meters shall have register box screws and coupling nuts drilled for seal wire holes. Meters larger than 2 inch in size shall have register box screws drilled for seal wire holes. All seal wire holes shall not be less than inch in diameter.

Measuring Chambers. The measuring chamber for all meters shall be made of bronze composition and shall not be cast as part of the outer casing. It shall be machined with great care and secured in position in the outer casing so that any slight distortion of the casing which might take place under 150 pounds working pressure will not affect the sensitiveness of the meter.

Discs. Disc pistons shall be made of vulcanized rubber and shall be fitted accurately but freely in their chambers. Vulcanized rubber pistons shall have a metal reinforcement or a thrust roller.

Intermediate gear trains. The intermediate gear trains shall be of such construction as to be easily removed and shall be made throughout of nonferrous material. Gear spindles may run in bearings bushed with hard rubber, provided the bushings are so constructed that they cannot drop

out.

Strainers. All meters shall be provided with strainers except when selfstrained by means of an annular space between the measuring chamber and the external case. Strainers shall be made of non-ferrous materials and shall fit tightly against the wall of the casing. They shall have an effective straining area as large as practicable and at least double that of the inlet.

Registration. The registration on the meter dial shall indicate the quantity recorded to be not less than 98 per cent nor more than 102 per cent of the water actually passed through the meter while it is being tested at rates of flow within the limits specified herein under "normal test flow limits." There shall be not less than 90 per cent of the actual flow recorded when a test is made at the rate of flow set forth under "minimum test flow."

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Capacity. New meters shall show a loss of head not exceeding 25 pounds per square inch, when the rate of flow is that given in the following table:

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Pressure test. Disc meters shall be guaranteed to operate under a working pressure of 150 pounds per square inch without leakage or damage to any part. Workmanship and material. Disc meters shall be guaranteed against defects in materials and workmanship for a period of one year from date of shipment. Parts to replace those in which a defect may develop within such period shall be supplied without charge, piece for piece, upon the return of such defective parts to the manufacturer thereof or upon proper proof of such defect.

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