Section 341.30. Low-water cutoff, water feeder and fusible plug.

 

(1)   General requirements.

(a) Every automatically fired power boiler that does not have a full-time attendant and every automatically fired low-pressure steam boiler shall be equipped with an automatic low-water fuel cutoff or other device which will perform a similar function, so located as to automatically cut off the fuel supply when the surface of the water falls to the lowest safe water line.

(b) If a water-feeding device is installed, it shall be so constructed that the water inlet valve cannot feed water into the boiler through the float chamber and so located as to supply requisite feed water. The lowest safe water line shall be not lower than the lowest visible part of the water glass.

(c) Boilers that are manually fired and have a residual heat source shall have a fusible plug installed which will extinguish the fire in the event of low water. Fire doors shall be provided with secure latches on manually fired boilers having fusible plugs.

(2)   Bowl designs. Designs embodying a float and float bowl, or probe control installed in a bowl or chamber external to the boiler, shall have a vertical, straight-run, valved drain pipe at the lowest point in the water-equalizing pipe connections , by which the bowl or chamber and the equalizing pipe can be flushed and the device tested.

Cr. Register, February, 1988, No. 386 , eff. 3-1-88; cr. (1) (c), Register, June, 1996, No. 486 , eff. 7-1-96; am. (1) (c), Register, February, 2000, No. 530 , eff. 3-1-00; CR 11-047 : am. (1) (a), (c), (2) Register May 2012 No. 677 , eff. 6-1-12.