Pressure or Altitude Gauges

Pressure or Altitude Gauges 1. Each hot-water boiler shall have a pressure or altitude gauge connected to it or to its flow connection in such a manner that it cannot be shut off from the boiler except by a cock with tee or lever handle placed on the pipe hear the gauge. The handle of the cock shall be parallel to the pipe in which it is located when the cock is open. 2. The range of the scale on the dial of the pressure or altitude gauge shall be not less than 1 1/2 times nor more than three times the maximum allowable working pressure. The gauge shall be provided with effective stops for the indicating pointer at the zero point and at the maximum pressure point. 3. Piping or tubing for pressure or altitude gauge connections shall be of nonferrous metal when smaller than one inch pipe size.