SPS 341.23(2)(a)(a) A verification that a periodic inspection has been performed shall be posted on or near the inspected item.
SPS 341.23(2)(b)
(b) A group of pressure vessels of the same design and use that are interconnected or are operated so as to form a unit, machine or apparatus may be included in a single inspection report. The report shall contain the number, description and use of the vessel.
SPS 341.23(2)(c)
(c) The inspection report shall explain any violation or unsafe condition with references to code section numbers. Recommendations to the owner or user of the vessel, relating to code violations, shall be included in the report to the department.
SPS 341.23(3)
(3) External inspections. External inspections shall be reported only when either of the following conditions is found:
SPS 341.23(3)(a)
(a) An internal inspection is not possible because of the construction of the vessel. In these cases the external inspection shall be reported to the department in the same manner as an internal inspection. The report shall be marked external, and the reason for making an external inspection instead of an internal shall be given.
SPS 341.23(3)(b)
(b) When violations of this chapter or unsafe conditions involving the safety of the vessel are found.
SPS 341.23 History
History: Cr.
Register, February, 1988, No. 386, eff. 3-1-88; am. (1), (2) (a) and (3) (b),
Register, February, 2000, No. 530, eff. 3-1-00;
CR 05-025: am. (1) and (2) (a), cr. (2) (a) 2.
Register October 2005 No. 598, eff. 11-1-05;
CR 11-047: r. and recr. (1), (2) (a), am. (3) (a)
Register May 2012 No. 677, eff. 6-1-12.
SPS 341.24(1)(a)1.1. Except as specified in
subd. 2., the owner or user of the boiler or pressure vessel shall be responsible for obtaining and maintaining a valid permit to operate.
SPS 341.24(1)(a)2.
2. An owner or user of a boiler or pressure vessel installed at a one- or 2-family dwelling is not required to apply for a permit to operate as specified in this section.
SPS 341.24(1)(b)
(b) Posting. The permit to operate shall be posted near the boiler or pressure vessel by the owner or user of the boiler or pressure vessel.
SPS 341.24(2)
(2) Issuance. After each installation or periodic inspection for boilers and pressure vessels found to be in compliance with this chapter, a permit to operate shall be issued by the department to the owner or user of the boiler or pressure vessel. The department shall issue the permit within 30 business days of determination of compliance.
SPS 341.24(3)
(3) Information. The permit to operate shall give the maximum allowable working pressure as determined using the regulations of this chapter, the certified inspector's name and telephone number, and the expiration date.
SPS 341.24(4)
(4) Expiration. The permit to operate shall be valid until the next required periodic inspection or until rescinded due to code violations.
SPS 341.24 History
History: Cr.
Register, February, 1988, No. 386, eff. 3-1-88; am.
Register, February, 2000, No. 530, eff. 3-1-00;
CR 05-025: am. (1) (b) and (4)
Register October 2005 No. 598, eff. 11-1-05;
CR 08-028: r. and recr. (1)
Register November 2008 No. 635, eff. 12-1-08;
CR 11-047: am. (1) (a) 2., (2)
Register May 2012 No. 677, eff. 6-1-12.
SPS 341.27
SPS 341.27
Application. Except as specified under
s. SPS 341.29 (2), this subchapter applies to all boilers and pressure vessels existing on or after June 1, 2012.
SPS 341.27 History
History: Cr.
Register, February, 1988, No. 386, eff. 3-1-88; correction made under s. 13.93 (2m) (b) 14, Stats.,
Register, May, 1994, No. 461;
CR 08-028: am.
Register November 2008 No. 635, eff. 12-1-08; correction made under s. 13.92 (4) (b) 7., Stats.,
Register December 2011 No. 672;
CR 11-047: am.
Register May 2012 No. 677, eff. 6-1-12.
SPS 341.28(1)(1)
Maximum allowable working pressure. No boiler or pressure vessel may be operated at a pressure in excess of the maximum allowable working pressure stated on its current permit to operate.
SPS 341.28(2)
(2) Alteration to safety devices. No unauthorized person may remove or tamper with any connected safety device.
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.
