Section 341.29. Safety controls.

 

(1)   General. Oil-fired, gas-fired and electrically heated boilers shall be equipped with primary safety controls, safety limit switches, and burners or electric elements that bear the stamp, monogram or other evidence of compliance with a nationally recognized standard.

(2)   Pressure and temperature controls.

(a) Boilers installed prior to 1957. Boilers installed prior to January 1, 1957, shall have at least one pressure control for steam boilers or one temperature control for hot water boilers or for organic- or synthetic-fluid heat-transfer systems. Compliance with par. (b) is optional for boilers installed prior to January 1, 1957.

(b) Boilers installed on or after January 1, 1957. Boilers installed on or after January 1, 1957, shall comply with s. SPS 341.42 and with all of the following:

1. `Pressure controls.'

a. 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.

b. Each individual automatically fired steam boiler shall have a high steam pressure limit control that will prevent generation of steam pressure in excess of the maximum allowable working pressure.

c. Each limit control and operating control shall be clearly separated, and have its own sensing element and operating switch.

d. No shut-off valve of any type may be placed in the steam pressure connection between the boiler and high pressure limit control device.

2. `Temperature controls.'

a. Each automatically fired hot-water heating boiler shall have at least one water temperature-actuated control to shut off the fuel supply when the system boiler water reaches a preset operating temperature.

b. Each system of commonly connected automatically fired hot-water heating boilers shall have at least one temperature-actuated control to shut off the fuel supply to all units when the system boiler water reaches a preset operating temperature.

c. Each individual automatically fired hot-water heating boiler unit shall have a high temperature limit control that prevents the boiler water temperature from exceeding the maximum allowable temperature of the boiler.

d. Each limit control and operating control shall be clearly separated, and shall have its own sensing element and operating switch.

e. No shut-off valve of any type may be placed in the piping between a boiler and its high-temperature-limit control device.

Cr. Register, February, 1988, No. 386 , eff. 3-1-88; am. (2) (a), Register, June, 1996, No. 486 , eff. 7-1-96; am. (2) (intro.), Register, February, 2000, No. 530 , eff. 3-1-00; CR 08-028 : r. and recr. (2) Register November 2008 No. 635 , eff. 12-1-08; correction in (2) (b) (intro.) made under s. 13.92 (4) (b) 7. , Stats., Register December 2011 No. 672 ; CR 11-047 : am. (1), (2) (a), cr. (2) (b) 2. e., am. (1) (a), (c), (2) Register May 2012 No. 677 , eff. 6-1-12.

Note

Typical acceptable stamps are the American Gas Association (AGA) and the Underwriters Laboratories (UL). Microsoft Windows NT 6.1.7601 Service Pack 1