NR 423.03(2)(g)1.1. Located outside of Kenosha, Kewaunee, Manitowoc, Milwaukee, Ozaukee, Racine, Sheboygan, Washington, and Waukesha counties is exempt from the requirements of this section. NR 423.03(2)(g)2.2. Located inside Kenosha, Kewaunee, Manitowoc, Milwaukee, Ozaukee, Racine, Sheboygan, Washington, or Waukesha county and whose emissions of VOCs are not more than 6.8 kilograms (15 pounds) in any one day is exempt from the requirements of sub. (7) (d). NR 423.03(2)(h)(h) This section does not apply to solvent metal cleaning operations using only cleaning solvents that have a VOC content of 2.0% or less by volume. NR 423.03(2)(i)(i) This section does not apply to any individual cold cleaning, batch vapor degreasing or conveyorized degreasing operation that is subject to ch. NR 469. NR 423.03(3)(3) Cold cleaners. Except as provided under sub. (2) (a), (b), (c), (h) and (i), the owner or operator of a cold cleaning facility shall do all of the following: NR 423.03(3)(b)(b) Design the cover so that it can be easily operated with one hand if any of the following applies: NR 423.03(3)(b)1.1. The solvent volatility is greater than 2 kPa (0.3 psia) measured at 38°C (100°F). NR 423.03(3)(c)(c) Equip the cleaner with a facility for draining cleaned parts, and the drainage facility shall be constructed internally so that parts are enclosed under the cover while draining if the solvent volatility is greater than 4.3 kPa (0.6 psia) measured at 38ºC (100°F), except that the drainage facility may be external for applications where an internal type cannot fit into the cleaning system. NR 423.03(3)(d)(d) Install one of the following control devices if the solvent volatility is greater than 4.3 kPa (0.6 psia) measured at 38°C (100°F), or if the solvent is heated above 49°C (120°F): NR 423.03(3)(d)1.1. Freeboard that gives a freeboard ratio greater than or equal to 0.70. NR 423.03(3)(d)2.2. Water cover (solvent must be insoluble in and heavier than water). NR 423.03(3)(d)3.3. Other systems of equivalent control, such as refrigerated chiller or carbon adsorption, approved by the department. NR 423.03(3)(e)(e) If used, supply a solvent spray that is a solid fluid stream (not a fine, atomized or shower type spray) at a pressure which does not cause extensive splashing. NR 423.03(3)(f)(f) Provide a permanent, conspicuous label, summarizing the operating requirements. NR 423.03(3)(g)(g) Provide supervision or instruction adequate to ensure that the operation is conducted in accord with all of the following: NR 423.03(3)(g)1.1. Close the cover whenever parts are not being handled in the cleaner. NR 423.03(3)(g)2.2. Drain the cleaned parts for at least 15 seconds or until dripping ceases. NR 423.03(3)(g)3.3. Store waste solvent only in covered containers and not dispose of waste solvent or transfer it to another person in such a way as to cause greater than 15% of the waste solvent, by weight, to evaporate into the ambient air during the ozone season, s. NR 419.04 notwithstanding. NR 423.03(3)(g)4.4. Repair solvent leaks immediately, or shut down the degreaser until the leaks are repaired. NR 423.03(3)(h)(h) Design the cover so that it is either a roll-top cover, a canvas curtain cover, a guillotine (biparting) cover, or any other type of cover that slides off the degreaser in a horizontal motion and is designed such that it can be opened or closed without disturbing the vapor layer or the solvent surface if any of the following applies: NR 423.03(3)(h)1.1. The solvent volatility is greater than 2 kPa (0.3 psia) measured at 38°C (100°F). NR 423.03(3)(i)(i) If freeboard is chosen as a control device under par. (d), design or modify the freeboard to give a freeboard ratio greater than or equal to 1.0. NR 423.03(3)(j)(j) If a system of equivalent control is chosen under par. (d) 3., the level of control shall be equivalent to that achieved under a freeboard ratio of 1.0. NR 423.03(4)(4) Open top vapor degreasers. Except as provided under sub. (2) (a), (b), (d), (h), and (i), the owner or operator of an open top vapor degreaser shall do all of the following: NR 423.03(4)(a)(a) Equip the vapor degreaser with a cover that can be opened and closed easily without disturbing the vapor zone. NR 423.03(4)(b)1.1. A condenser flow switch or other switching system which shuts off the sump heat if the condenser coolant is either not circulating or too warm. NR 423.03(4)(b)2.2. A thermostatically activated control switch which shuts off the sump heat when the vapor level rises above the upper boundary of the normal range. NR 423.03(4)(b)3.3. A spray safety switch which shuts off the spray pump if the vapor level does not stay within the normal range. NR 423.03(4)(c)1.1. Except when par. (o) applies, a freeboard ratio equal to or greater than 0.75 for all degreasers, with a powered or mechanically assisted cover for any degreaser with an opening which is greater than 1.0 square meter (10.8 square feet). NR 423.03(4)(c)3.3. Enclosed design (cover or door opens only when the dry part is actually entering or exiting the degreaser). NR 423.03(4)(c)4.4. Ventilation greater than or equal to 15 cubic meters per minute per square meter (50 cubic feet per minute per square foot) of air-vapor area (when cover is open), all passing through a carbon adsorption system which exhausts less than 25 parts per million of solvent averaged over one complete adsorption cycle. NR 423.03(4)(c)5.5. A control system demonstrated to have control efficiency equivalent to or greater than any of subds. 1. to 4. and approved by the department. NR 423.03(4)(d)(d) Position any ventilation fans so that they do not disturb the degreaser’s vapor zone, and limit exhaust ventilation to 20 cubic meters per minute per square meter (65 cubic feet per minute per square foot) of degreaser open area during the ozone season, unless a higher exhaust rate is necessary to meet OSHA requirements. NR 423.03(4)(e)(e) Keep the cover closed at all times except when processing workloads through the degreaser. NR 423.03(4)(g)(g) Minimize solvent carryout by doing all of the following: NR 423.03(4)(g)2.2. Moving parts in and out of the degreaser at less than 3.3 meters per minute (11 feet per minute). NR 423.03(4)(g)3.3. Holding the parts in the vapor zone at least 30 seconds or until condensation ceases. NR 423.03(4)(g)4.4. Tipping out any pools of solvent on the cleaned parts before removal from the vapor zone. NR 423.03(4)(g)5.5. Allowing parts to dry within the degreaser for at least 15 seconds or until visually dry. NR 423.03(4)(h)(h) Prevent porous or absorbent materials, such as cloth, leather, wood, or rope, from entering the degreaser. NR 423.03(4)(i)(i) Move parts in and out of the degreaser at less than 1.5 meters per minute (4.9 feet per minute) if the workload occupies more than 50% of the degreaser’s open top area. NR 423.03(4)(j)(j) Except where a load cannot be divided, avoid loading the degreaser to the point where the vapor level would drop more than 10 centimeters (4 inches) when the workload is placed in the vapor zone. NR 423.03(4)(k)(k) Operate the degreaser in a manner that prevents water from being visually detectable in solvent exiting the water separator. NR 423.03(4)(m)(m) Provide a permanent, conspicuous label, summarizing the operating procedures of pars. (e) to (i), and (q) if applicable, and provide supervision or instruction adequate to ensure that the procedures are followed. NR 423.03(4)(n)(n) Equip the vapor degreaser with an enclosed design, such that the cover or door opens only when the dry part is actually entering or exiting the degreaser, that is either a roll-top cover, a canvas curtain cover, a guillotine (biparting) cover, or any other type of cover that slides off the degreaser in a horizontal motion and is designed such that it can be opened or closed without disturbing the vapor layer or the solvent surface, and if the degreaser opening is greater than 2.0 square meters (21.6 square feet), then design the cover to be an automated, powered or mechanically assisted sliding cover. NR 423.03(4)(o)(o) Under par. (c), if par. (c) 1. is chosen, design or modify the freeboard to give a freeboard ratio equal to or greater than 1.0. NR 423.03(4)(p)(p) If a system of equivalent control is chosen under par. (c) 5., the level of control shall be equivalent to that achieved under a freeboard ratio of 1.0. NR 423.03(4)(q)(q) At startup, turn on the refrigerated condenser and the refrigerated freeboard chiller either simultaneously with or before turning on the sump heater. At shutdown, turn off the sump heater either simultaneously with or before turning off the refrigerated condenser and refrigerated freeboard chiller. NR 423.03(5)(5) Conveyorized vapor degreasers. Except as provided under sub. (2) (a), (b), (e), (h), and (i), the owner or operator of a conveyorized vapor degreaser shall do all of the following: NR 423.03(5)(a)(a) Minimize entrance and exit openings during operation so that no opening dimension exceeds the smallest physically possible by more than 20 centimeters (8 inches) or by more than 20% of the opening dimension, whichever is smaller. NR 423.03(5)(b)1.1. A condenser flow switch or other switching system which shuts off the sump heat if the condenser coolant is either not circulating or too warm. NR 423.03(5)(b)2.2. A thermostatically activated control switch which shuts off the sump heat when the vapor level rises above the upper boundary of the normal range. NR 423.03(5)(b)3.3. A spray safety switch which shuts off the spray pump or the conveyor if the vapor level does not stay within the normal range. NR 423.03(5)(c)2.2. Carbon adsorption system, with ventilation greater than or equal to 15 cubic meters per minute per square meter (50 cubic feet per minute per square foot) of air-vapor area (when downtime covers are open), and exhausting less that 25 parts per million of solvent by volume averaged over a complete adsorption cycle. NR 423.03(5)(c)3.3. A system demonstrated to have a control efficiency equivalent to or greater than subd. 1. or 2. and approved by the department. NR 423.03(5)(d)(d) Provide downtime covers for closing off the entrance and exit during shutdown hours. NR 423.03(5)(e)(e) Place downtime covers over entrances and exits of conveyorized vapor degreasers immediately after the conveyors and exhausts are shut down and not remove them until just before startup. NR 423.03(5)(f)(f) Minimize carryout emissions by doing all of the following: NR 423.03(5)(f)1.1. Using a drying tunnel, rotating (tumbling) basket or their equivalent. NR 423.03(5)(f)3.3. Maintaining the vertical conveyor speed at less than 3.3 meters per minute (11 feet per minute). NR 423.03(5)(h)(h) Minimize entrance and exit openings during operation so that no opening dimension exceeds the smallest physically possible by more than 10 centimeters (4 inches) or by more than 10% of the opening dimension, whichever is smaller. NR 423.03(5)(i)(i) At startup, turn on the refrigerated condenser and the refrigerated freeboard chiller either simultaneously with or before turning on the sump heater. At shutdown, turn off the sump heater either simultaneously with or before turning off the refrigerated condenser and refrigerated freeboard chiller. NR 423.03(5)(j)(j) Provide a permanent, conspicuous label summarizing the operating procedures of pars. (e) to (i), and provide supervision or instruction adequate to ensure that the procedures are followed. NR 423.03(6)(a)(a) Control requirements. Except as provided under sub. (2) (a), (b), (f), (h), and (i), the owner or operator of a conveyorized non-vapor degreaser shall do all of the following: NR 423.03(6)(a)1.1. Minimize entrance and exit openings during operation so that no opening dimension exceeds the smallest physically possible by more than 20 centimeters (8 inches) or by more than 20% of the opening dimension, whichever is smaller. NR 423.03(6)(a)2.a.a. A carbon adsorption system demonstrated to have at least a 95% control efficiency, as measured across the carbon adsorption equipment and averaged over a complete adsorption cycle. NR 423.03(6)(a)2.b.b. A system, demonstrated to have a control efficiency equivalent to or greater than that described in subd. 2. a., and approved by the department. NR 423.03(6)(a)3.3. Provide downtime covers for closing off the entrance and exit during shutdown hours. NR 423.03(6)(a)4.4. Place downtime covers over the entrances and exits of conveyorized non-vapor degreasers immediately after the conveyors and exhausts are shut down and not remove them until just before startup.
/exec_review/admin_code/nr/400/423
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administrativecode
/exec_review/admin_code/nr/400/423/03/4
Department of Natural Resources (NR)
Chs. NR 400-499; Environmental Protection – Air Pollution Control
administrativecode/NR 423.03(4)
administrativecode/NR 423.03(4)
section
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