Wisconsin Administrative Code › Department of Safety and Professional Services › SPS 301-399 - Safety, Buildings, and Environment › SPS 326-360 - General, Part II › Chapter SPS 341 - Boilers And Pressure Vessels › Subchapter III - All Installations › Section SPS 341.29 - Safety controls

Current through June 24, 2024
(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.
Note:
Typical acceptable stamps are the
						American Gas Association (AGA) and the Underwriters Laboratories (UL).
(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.