Register May 2022 No. 797
Chapter NR 423
CONTROL OF ORGANIC COMPOUND EMISSIONS FROM
SOLVENT CLEANING OPERATIONS
NR 423.01 Applicability; purpose.
NR 423.03 Solvent metal cleaning.
NR 423.035 Industrial cleaning operations — part 1.
NR 423.037 Industrial cleaning operations — part 2.
NR 423.05 Liquid VOC solvent dry cleaning.
NR 423.01(1)(1)
Applicability. This chapter applies to all solvent cleaning operation air contaminant sources and to their owners and operators.
NR 423.01(2)
(2)
Purpose. This chapter is adopted under ss.
285.11,
285.13, and
285.17, Stats., to categorize organic compound emissions from solvent cleaning operations into separate organic compound air contaminant source categories and to establish emission limitations for these categories of sources in order to protect air quality.
NR 423.02
NR 423.02 Definitions. The definitions contained in chs.
NR 400,
419,
420, and
421 apply to the terms used in this chapter. In addition, the following definitions apply to the terms used in this chapter:
NR 423.02(1g)
(1g) “Aerosol product" means solvent or solvent solution expelled by a propellant from a hand-held non-refillable pressurized container.
NR 423.02(2)
(2) “Cartridge filter" means a perforated canister containing filtration paper or activated carbon, or both, that is used to remove solid particles and fugitive dyes from soil-laden solvent.
NR 423.02(5)
(5) “Dry cleaning facility" means any facility engaged in the cleaning of fabrics or leather in an essentially nonaqueous solvent by means of one or more washes in solvent, extraction of excess solvent by spinning, and drying by tumbling in an airstream. The facility includes but is not limited to any washer, dryer, filter and purification systems, waste disposal systems, holding tanks, pumps, and attendant piping and valves.
NR 423.02(5g)
(5g) “Electrical apparatus component" means an internal component such as wires, windings, stators, rotors, magnets, contacts, relays, energizers and connections in an apparatus that generates or transmits electrical energy including, but not limited to: alternators, generators, transformers, electric motors, cables and circuit breakers, except for the actual cabinet in which the components are housed. Electrical components of all rotogravure, letterpress, flexographic and lithographic application equipment and hot-line tools are also included in this category.
NR 423.02(5m)
(5m) “Flexible magnetic data storage disc" means a flat, circular plastic film, contained in a non-rigid envelope, with a magnetic coating on which digital information can be stored by selective magnetization of portions of the flat surface.
NR 423.02(6)
(6) “Freeboard height" means, for a cold cleaner, the distance from the liquid solvent level in the degreaser tank to the lip of the tank. For a vapor degreaser it means the distance from the top of the vapor zone to the lip of the degreaser tank.
NR 423.02(7)
(7) “Freeboard ratio" means the freeboard height divided by the internal width of the degreaser tank.
NR 423.02(7m)
(7m) “Hot-line tool" means a specialized tool used primarily on the transmission systems, sub-transmission systems and distribution systems for replacing and repairing circuit components or for other types of work with electrically energized circuits.
NR 423.02(8c)
(8c) “Letterpress printing" means the method in which the image area is raised relative to the non-image area and the ink is transferred directly from the ink roller to the plate cylinder.
NR 423.02(8p)
(8p) “Medical device" means an instrument, apparatus, implement, machine, contrivance, implant, in vitro reagent or other similar article, including any component or accessory that meets any one of the following conditions:
NR 423.02(8p)(a)
(a) It is intended for use in the diagnosis of disease or other conditions, or in the cure, mitigation, treatment or prevention of disease.
NR 423.02(8p)(b)
(b) It is intended to affect the structure or function of the body.
NR 423.02 Note
Note: Common examples of such medical devices include but are not limited to x-ray machines, medical lasers, diagnostic ultrasound products, thermometers, bedpans, artificial hearts, pacemakers, pregnancy test kits, scalpels, tongue depressors and bandages.
NR 423.02(8x)
(8x) “On-press component" means a part, component or accessory of a press that is cleaned while still being physically attached to the press. Rollers, blankets, metering rollers, fountains, impression cylinders and plates are considered on-press components even when detached from the press.
NR 423.02(9)
(9) “Refrigerated freeboard chiller" means an emission control device which is mounted above the water jacket or primary condenser coils of a vapor degreaser and which consists of secondary coils carrying a refrigerant to provide a chilled air blanket above the solvent vapor.
NR 423.02(9g)
(9g) “Removable press component" means a part, component or accessory of a press, excluding rollers, blankets, metering rollers, fountains, impression cylinders and plates, that is physically attached to the press but is disassembled and removed from the press prior to being cleaned.
NR 423.02(9t)
(9t) “Rigid magnetic data storage disc" means a flat, circular, non-flexible plate with a magnetic coating on which digital information can be stored by selective magnetization of portions of the flat surface.
NR 423.02(10)
(10) “Solvent metal cleaning" means the process of cleaning soils from metal surfaces by cold cleaning, open top vapor degreasing, conveyorized degreasing or wipe cleaning.
NR 423.02(10r)
(10r) “Surface preparation" means the removal of contaminants such as dust, soil, oil, etc., prior to coating, adhesive or ink applications.
NR 423.02(11)
(11) “Solvent recovery dryer" means a dry cleaning dryer that employs a condenser to liquefy and recover solvent vapors evaporated in a closed-loop, recirculating stream of heated air.
NR 423.02(11g)
(11g) “VOC composite partial vapor pressure" means the sum of the partial pressures of the compounds defined as VOCs and shall be calculated by one of the following equations:
or, if the total vapor pressure of the mixture is unknown
where:
PVOC is the VOC composite partial vapor pressure at 20°C (mm Hg)
Wi is the weight of the i th VOC compound (kilograms)
MWi is the molecular weight of the i th VOC compound (kilograms per kilogram mole)
Ww is the weight of the water (kilograms)
MWw is the molecular weight of the water (kilograms per kilogram mole)
W
NVOCj is the weight of the j th organic compound included in the VOC exclusion list in s.
NR 400.02 (162) (kilograms)
MW
NVOCj is the molecular weight of the j th organic compound included in the VOC exclusion list in s.
NR 400.02 (162) (kilograms per kilogram mole)
Ptotal is the total vapor pressure of the mixture at 20°C (mm Hg)
VPi is the vapor pressure of i th VOC compound at 20°C (mm Hg)
NR 423.02(11r)
(11r) “VOC content" means the weight of VOC per volume of solvent or solvent solution and shall be calculated by the following equation:
where:
