SPS 341.28(3)(a)(a) Except as specified in
par. (b), boilers and pressure vessels shall be installed in accordance with the manufacturer's installation specifications.
SPS 341.28(3)(b)
(b) Clearances shall be maintained around boilers, generators, heaters, tanks and related equipment and appliances to permit inspection, servicing, repair, replacement and visibility of all gages. When boilers are installed or replaced, clearance shall be provided to allow access for inspection, maintenance and repair. Passageways around all sides of boilers shall have an unobstructed width of not less than 18 inches unless otherwise approved by the department or authorized agent.
SPS 341.28 History
History: Cr.
Register, February, 1988, No. 386, eff. 3-1-88; am. (1),
Register, February, 2000, No. 530, eff. 3-1-00;
CR 08-028: r. and recr. (3)
Register November 2008 No. 635, eff. 12-1-08;
CR 11-047: am. (3)
Register May 2012 No. 677, eff. 6-1-12.
SPS 341.29(1)
(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.
SPS 341.29 Note
Note: Typical acceptable stamps are the American Gas Association (AGA) and the Underwriters Laboratories (UL).
SPS 341.29(2)(a)(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.
SPS 341.29(2)(b)
(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:
SPS 341.29(2)(b)1.a.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.
SPS 341.29(2)(b)1.b.
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.
SPS 341.29(2)(b)1.c.
c. Each limit control and operating control shall be clearly separated, and have its own sensing element and operating switch.
SPS 341.29(2)(b)1.d.
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.
SPS 341.29(2)(b)2.a.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.
SPS 341.29(2)(b)2.b.
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.
SPS 341.29(2)(b)2.c.
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.
SPS 341.29(2)(b)2.d.
d. Each limit control and operating control shall be clearly separated, and shall have its own sensing element and operating switch.
SPS 341.29(2)(b)2.e.
e. No shut-off valve of any type may be placed in the piping between a boiler and its high-temperature-limit control device.
SPS 341.29 History
History: 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.
SPS 341.30
SPS 341.30
Low-water cutoff, water feeder and fusible plug. SPS 341.30(1)(a)(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.
SPS 341.30(1)(b)
(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.
SPS 341.30(1)(c)
(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.
SPS 341.30(2)
(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.
SPS 341.30 History
History: 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.
SPS 341.31(1)
(1)
Pressure-temperature limits. The blowdown from a boiler that enters a sewer system or blowdown which is considered a hazard to life or property shall pass through some form of blowoff equipment that will reduce pressure and temperature as specified in
pars. (a) and
(b).
SPS 341.31(1)(a)
(a) The temperature of the water leaving the blowoff equipment may not exceed 160
°F.
SPS 341.31(1)(b)
(b) The pressure of the blowdown leaving the blowoff equipment may not exceed 5 psig.
SPS 341.31(2)
(2) Piping and fittings. The blowoff piping and fittings between the boiler and the blowoff tank shall comply with ASME B31.1 or the code in effect at the time of construction.
SPS 341.31(3)
(3) Tanks and separators. The blowoff tank or separator shall be designed in accordance with
s. SPS 341.42 or the code in effect at the time of construction for a maximum allowable working pressure of at least 50 psig.
SPS 341.31(4)
(4) General requirements. All blowoff equipment, except centrifugal blowdown separators, shall be fitted with openings to facilitate cleaning and inspection and shall have all of the following:
SPS 341.31(4)(b)
(b) A thermometer well located near the water outlet connection and in contact with the retained water in the tank.
SPS 341.31(4)(c)
(c) A gage glass at least one-half inch in diameter with the lower connection to the glass at a point about 6 inches below the water line and the upper connection at a point about 6 inches above the water line.
SPS 341.31(4)(e)
(e) Connections designed so that freezing will not close the inlet, the outlet or the vent.
SPS 341.31(5)
(5) Vent piping. All blowoff equipment shall have vent piping, full size, piped to the outside atmosphere and discharged to a safe location.
SPS 341.31 Note
Note: Blowoff equipment designed in accordance with the boiler blowoff equipment rules issued by the National Board of Boiler and Pressure Vessel Inspectors will meet the requirements of this section. Other methods of designing blowoff equipment may be used if approved by the Department.
SPS 341.31 History
History: Cr.
Register, February, 1988, No. 386, eff. 3-1-88; am. (4) (d) and (e), r. (4) (f), cr. (5),
Register, December, 1992, No. 444, eff. 1-1-93;
am. (2), (3), (4) (a),
Register, June, 1996, No. 486, eff. 7-1-96; am. (2),
Register, February, 2000, No. 530, eff. 3-1-00;
CR 05-025: am. (1) (a)
Register October 2005 No. 598, eff. 11-1-05; correction in (3) made under s.
13.92 (4) (b) 7., Stats.,
Register December 2011 No. 672;
CR 11-047: am. (1) (b), (2), (4) (intro.) to (d)
Register May 2012 No. 677, eff. 6-1-12.
SPS 341.32
SPS 341.32
Pressure gages for air receivers. SPS 341.32(1)(1)
Gage location. Air receivers shall be equipped with an indicating pressure gage so located as to be readily visible.
SPS 341.32(2)
(2) Gage dial. The dial of the pressure gage shall be graduated to approximately double the pressure at which the safety valve is set, but may not be less than one and one-half times that pressure.
SPS 341.32 History
History: Cr.
Register, February, 1988, No. 386, eff. 3-1-88.
SPS 341.33
SPS 341.33
Protection of vessels supplied through pressure-reducing stations. SPS 341.33(1)
(1)
Sizing safety valves. The requirements in this section shall be used for determining the sizes of safety valves on pressure vessels such as pressure cookers, indirect hot water heaters and equipment in heating systems, that are supplied through pressure-reducing stations from boilers carrying a higher steam pressure. Where a pressure-reducing station is supplied from a boiler, the capacity of the safety valves on the low-pressure side of the system need not exceed the capacity of the boiler.
SPS 341.33(2)(b)
(b) The critical flow capacity data supplied by the reducing valve manufacturer may be used in place of the above formula to select the required safety valve capacity. The capacity calculations shall be the largest obtainable by internal trim change of the reducing valve.
SPS 341.33(2)(c)
(c) In using Table 341.33-1, the pressure-reducing station inlet pressure is the lowest set pressure of any safety valve on the high pressure side of the pressure-reducing station.
SPS 341.33(3)
(3) Bypass capacity. The following formula shall be used to determine the steam flow rate through the bypass when pressure-reducing stations are arranged with a valved bypass that also acts as a potential steam source hazard in case the bypass is left open. -
See PDF for diagram 
-
See PDF for table
Where capacities are not shown for inlet and outlet conditions, use the highest capacity shown under the applicable inlet pressure column.
-
See PDF for table SPS 341.33 Note
Note: In applying Table 341.33-2, the area of the pipe is always based upon standard weight pipe and the inlet size of the pressure-reducing valve.
SPS 341.33 History
History: Cr.
Register, February, 1988, No. 386, eff. 3-1-88; am. intro., (1)(intro.), (2), r. and recr. (1) (a) and (b),
Register, May, 1994, No. 461, eff.6-1-94; am. (1) (a),
Register, June, 1996, No. 486, eff. 7-1-96; correction in (1) (intro.), (b), (2) made under s.
13.92 (4) (b) 7., Stats.,
Register December 2011 No. 672;
CR 11-047: (intro.), (1) (intro.) to (c), (2), (3) renum. to be (1), (2) (intro.) to (b), (3), (4)
Register May 2012 No. 677, eff. 6-1-12.
SPS 341.34(1)(1)
Permit required. The owner or user of a portable boiler located in Wisconsin or brought into Wisconsin for use, shall possess a permit to operate issued by the department prior to use.
SPS 341.34(2)
(2) Boiler requirements. The permit to operate shall be issued only after all of the following requirements are met:
SPS 341.34(2)(b)
(b) The boiler is installed according to the applicable requirements of this chapter.
SPS 341.34(2)(c)
(c) An internal or external inspection of the boiler has been made that is acceptable to the department.
SPS 341.34 History
History: Cr.
Register, February, 1988, No. 386, eff. 3-1-88; am.
Register, February, 2000, No. 530, eff. 3-1-00; correction in (2) (a) made under s.
13.92 (4) (b) 7., Stats.,
Register December 2011 No. 672;
CR 11-047: am. (2) (c)
Register May 2012 No. 677, eff. 6-1-12.
SPS 341.35
SPS 341.35
Interconnected boilers. When boilers of different maximum allowable working pressures with minimum safety valve settings varying more than 6% are so connected that steam can flow toward the lower pressure units, the latter shall be protected by additional safety valve capacity, if necessary, on the lower pressure side of the system. The additional safety valve capacity shall be based upon the maximum amount of steam that can flow into the lower pressure system. The additional safety valves shall have at least one valve set at a pressure not to exceed the lowest allowable pressure and the other valves shall be set within a range not to exceed 3% above that pressure.
SPS 341.35 History
History: History: Cr.
Register, February, 1988, No. 386, eff. 3-1-88;
CR 11-047: am.
Register May 2012 No. 677, eff. 6-1-12.
SPS 341.36
SPS 341.36
Identification of boilers and pressure vessels. Boilers and pressure vessels subject to periodic inspections shall be identified by a registration number supplied by the department. The registration number shall be affixed
to the vessel by a certified inspector at a location that can be easily viewed.
SPS 341.36 History
History: Cr.
Register, February, 1988, No. 386, eff. 3-1-88; am. (2),
Register, October, 1996, No. 490, eff. 11-1-96; r. (1),
Register, February, 2000, No. 530, eff. 3-1-00;
CR 11-047: r. (2) (title), renum. (2) to be 341.36 and am.
Register May 2012 No. 677, eff.6-1-12.
SPS 341.37(1)(1)
Corrosion prevention. All boilers and pressure vessels shall be installed and maintained in such a manner as to prevent excessive corrosion and deterioration.
SPS 341.37(2)
(2) Safe conditions. The certified inspector shall note conditions during internal inspection, external inspection, or hydrostatic pressure test and shall order changes or repairs that will place the boiler or pressure vessel in a safe working condition.
SPS 341.37 Note
Note: Sections VI and VII of the ASME boiler and pressure vessel code, Recommended Rules for Care and Operation of Heating Boilers and Recommended Rules for Care of Power Boilers, are excellent guides for boiler owners and operators.
SPS 341.37(3)
(3) Modification of boiler burner assembly. Any modification to or installation of a boiler burner assembly may not exceed the original stamping of the boiler rated output capacity.
SPS 341.37 Note
Note: See section
SPS 341.38 for Department reporting requirements relating to fuel conversions and to modifications for increasing heat input.
SPS 341.37 History
History: Cr.
Register, February, 1988, No. 386, eff. 3-1-88; am. (2),
Register, October, 1996, No. 490, eff. 11-1-96;
CR 08-028: cr. (3)
Register November 2008 No. 635, eff. 12-1-08;
CR 11-047: am. (2)
Register May 2012 No. 677, eff. 6-1-12.
SPS 341.38
SPS 341.38
Reporting accidents, repairs and alterations. SPS 341.38(1)(a)(a) If a component of a boiler or pressure vessel or power piping fails and causes an injury that needs more than first aid treatment, the owner or user shall report the facts involved to the department on form SBD-10787-E within 24 hours after the accident.
SPS 341.38(1)(b)
(b) After a failure under
par. (a), the owner or user may not remove or disturb the boiler or pressure vessel or power piping or any of the components nor permit any such removal or disturbance prior to receiving authorization from the department or first class city, except for the purpose of saving human life or preventing further property damage.
SPS 341.38(1)(c)
(c) Any accidents under
par. (a) that occur during the department's non-business hours shall also be reported to the state division of emergency management.
SPS 341.38 Note
Note: The address for reporting accidents to the Department is the Division of Industry Services, Boiler Program, P.O. Box 7302, Madison, WI 53707-7302; and the fax number is 608-283-7420.
SPS 341.38 Note
Note: The Department can be contacted at 262/548-8617 during normal business hours. The state Division of Emergency Management can be contacted at (800) 943-0003 during non-business hours.
SPS 341.38(2)
(2) Repairs and alterations. The owner or user shall report to the department any repairs or alterations of a boiler or pressure vessel as required in subch.
VI.
SPS 341.38(3)
(3) Fuel conversions. The owner or user shall report to the department conversions of the boiler's primary fuels to other fuels and shall use department form SBD-6314-E for this notification.
SPS 341.38(4)
(4) Heat input. The owner or user shall report to the department any modification that increases the heat input capacity of the boiler and shall use department form SBD-6314-E for this notification.
SPS 341.38 Note
Note: The Department forms required in this chapter are available for a nominal fee at telephone 800-DOC-SALE or 411 (Telecommunications Relay), or at
docsales@doa.state.wi.us, or at no charge at the Department's Web site at
www.dsps.wi.gov through links to Division of Industry Services forms.
SPS 341.38 History
History: Cr.
Register, February, 1988, No. 386, eff. 3-1-88; am. (1) to (3), cr. (4),
Register, February, 2000, No. 530, eff. 3-1-00;
CR 08-028: r. and recr. (1), am. (3) and (4)
Register November 2008 No. 635, eff. 12-1-08;
CR 11-047: r. and recr. (1), am. (3), (4)
Register May 2012 No. 677, eff. 6-1-12.
