R20-5-416. Maximum Allowable Working Pressure

A. The ASME Code under which a Boiler, Lined Hot Water Heater, or Pressure Vessel was constructed and stamped shall determine the MAWP. B. If components in the Boiler, or hot water system such as valves, pumps, expansion tanks, storage tanks or piping have a lesser working pressure rating than the Boiler or Lined Hot Water Heater, the pressure setting for the Safety Valve Relief Valve, or Safety Relief Valve on the Boiler or Lined Hot Water Heater shall be based upon the component with the lowest MAWP rating.