Gauges and Drains

(1) Pressure Gauge. (a) Every Air Tank shall have a pressure gauge connected in a manner that the pressure gauge cannot be shut off from the Air Tank except by a cock with T or lever handle, which shall be placed on the pipe near the pressure gauge. Gauge connections shall be of brass pipe and fitting or copper tubing so connected to the system that they will not be exposed to high temperatures due to compression. The minimum copper tubing size used shall be c inch. (b) The dial of the pressure gauge shall be graduated to not less than 1½ times the maximum pressure allowed on the Air Tank. Test Gauge Connection. The Owner/User of the Air Tank shall install a test gauge connection at the request of the District Engineering Inspector or Authorized Inservice Inspector. (3) Bottom Drain Pipe. Each Air Tank shall have a bottom drain pipe fitted with a valve or cock, of the straightway type, in direct connection with lowest water space practicable, or a pipe may be used extending inward from any other location to within ¼ inch (6 mm) of the lowest point. The minimum size of pipe and fittings shall be ½ inch except for tanks 20 inches in diameter or less, in which the minimum size of such pipe and fitting shall be ¼ inch iron pipe size. If a plug cock is used, the plug shall be held in place with a guard or gland.