16VAC25-50-445: Pressure control devices

Each automatically fired steam boiler or system of commonly connected steam boilers shall have at least one steam pressure control device that will shut off the fuel supply to each boiler or system of commonly connected boilers when the steam pressure reaches a preset maximum operating pressure. In addition, each individual automatically fired steam boiler shall have a high steam pressure limit control with a manual reset that will prevent generation of steam pressure in excess of the maximum allowable working pressure and can cause safety shutdown and lockout.