NAC512.592. Boilers: Supervision.

     1. Except as otherwise provided in subsection 5, a high-pressure, high-temperature boiler and a power boiler must be attended by a person who meets the qualifications set forth in NAC 512.590.

     2. A steam boiler must be attended by a person who meets the qualifications set forth in NAC 512.590, unless the boiler is equipped with:

     (a) A mechanism that cuts off fuel if the level of water in the boiler or pressure vessel is low;

     (b) An automatic feed water regulator;

     (c) Fireside regulators and controls;

     (d) An audible alarm to indicate low water; and

     (e) A pressure control.

     3. The attendant shall check personally the operation of the boiler, the necessary auxiliaries and the level of water in the boiler at intervals necessary to ensure the safe operation of the boiler but not less than once every 60 minutes or for intervals in excess of the time required to evaporate the water from the normal operating level to the lowest water level permissible if the feed water is shut off or the boiler is forced to its maximum capacity. A log noting the time of all checks and observations must be kept in the boiler room.

     4. If attendance of the boiler is required pursuant to this section, a time clock to start or stop the operation of the boiler automatically must not be used, unless the timing mechanism is a device or system that has been approved by the Administrator.

     5. A high-pressure, high-temperature boiler and a power boiler do not need to be attended, if the boiler is equipped with the following protective devices which are functioning properly, as required by the applicable provisions of Controls and Safety Devices for Automatically Fired Boilers, CSD-I, which is adopted by reference pursuant to NAC 512.562:

     (a) If the boiler is operated at less than supercritical pressure:

          (1) A mechanism that cuts off fuel if the level of water in the boiler or pressure vessel is low;

          (2) An automatic feed regulator;

          (3) Fireside regulators and controls;

          (4) An audible alarm to indicate low water;

          (5) A pressure control; and

          (6) A programmed flame safeguard system with an audible alarm on burners equipped with spark ignition.

     (b) If the boiler is operated at supercritical pressure (3206 PSIG and 705ºF):

          (1) All the devices set forth in paragraph (a);

          (2) A cutoff device for high temperature or fuel; and

          (3) An audible alarm to indicate high temperature.

     (Added to NAC by Div. of Industrial Relations by R141-98, eff. 1-28-2000)