NR 440.72(2)(a)6.
6. “Electromagnetic interference/radio frequency interference (EMI/RFI) shielding coating" means a conductive coating that is applied to a plastic substrate to attenuate EMI/RFI signals.
NR 440.72(2)(a)7.
7. “Fog coating" (also known as mist coating and uniforming) means a thin coating applied to plastic parts that have molded-in color or texture or both to improve color uniformity.
NR 440.72(2)(a)8.
8. “Nominal 1-month period" means either a calendar month, 30-day month, accounting month, or similar monthly time period that is established prior to the performance test.
NR 440.72(2)(a)9.
9. “Plastic parts" means panels, housings, bases, covers, and other business machine components formed of synthetic polymers.
NR 440.72(2)(a)10.
10. “Prime coat" means the initial coat applied to a part when more than one coating is applied, not including conductive sensitizers or electromagnetic interference/radio frequency interference shielding coatings.
NR 440.72(2)(a)11.
11. “Spray booth" means the structure housing automatic or manual spray application equipment where a coating is applied to plastic parts for business machines.
NR 440.72(2)(a)12.
12. “Texture coat" means the rough coat that is characterized by discrete, raised spots on the exterior surface of the part. This definition does not include conductive sensitizers or EMI/RFI shielded coatings.
NR 440.72(2)(a)13.
13. “Touch-up coat" means the coat applied to correct any imperfections in the finish after color or texture coats have been applied. This definition does not include conductive sensitizers or EMI/RFI shielded coatings.
NR 440.72(2)(a)14.
14. “Transfer efficiency" means the ratio of the amount of coating solids deposited onto the surface of a plastic business machine part to the total amount of coating solids used.
NR 440.72(2)(a)15.
15. “VOC emissions" means the mass of VOCs emitted from the surface coating of plastic parts for business machines expressed as kilograms of VOCs per liter of coating solids applied (i.e., deposited on the surface).
NR 440.72(2)(b)
(b) As used in this section, all symbols not defined in this subsection have the meanings given them in
s. NR 440.03.
Dc = density of each coating as received (kilograms per liter)
Dd = density of each diluent VOC (kilograms per liter)
Lc = the volume to each coating consumed, as received (liters)
Ld = the volume of each diluent VOC added to coatings (liters)
Ls = the volume of coating solids consumed (liters)
Md = the mass of diluent VOCs consumed (kilograms)
Mo = the mass of VOCs in coatings consumed, as received (kilograms)
N = the volume-weighted average mass of VOC emissions to the atmosphere per unit volume of coating solids applied (kilograms per liter)
T = the transfer efficiency for each type of application equipment used at a coating operation (fraction)
Tavg = the volume weighted average transfer efficiency for a coating operation (fraction)
Vs = the proportion of solids in each coating, as received (fraction by volume)
Wo = the proportion of VOCs in each coating, as received (fraction by weight)
NR 440.72(3)(a)(a) Each owner or operator of any affected facility which is subject to the requirements of this section shall comply with the emission limitations set forth in this subsection on and after the date on which the initial performance test, required by
s. NR 440.08 and
sub. (4) is completed, but not later than 60 days after achieving the maximum production rate at which the affected facility will be operated, or 180 days after the initial startup, which ever date comes first. No affected facility may cause the discharge into the atmosphere in excess of:
NR 440.72(3)(a)1.
1. 1.5 kilograms of VOCs per liter of coating solids applied from prime coating of plastic parts for business machines.
NR 440.72(3)(a)2.
2. 1.5 kilograms of VOCs per liter of coating solids applied from color coating of plastic parts for business machines.
NR 440.72(3)(a)3.
3. 2.3 kilograms of VOCs per liter of coating solids applied from texture coating of plastic parts for business machines.
NR 440.72(3)(a)4.
4. 2.3 kilograms of VOCs per liter of coatings solids applied from touch-up coating of plastic parts for business machines.
NR 440.72(3)(b)
(b) All VOC emissions that are caused by coating applied in each affected facility, regardless of the actual point of discharge of emissions into the atmosphere, shall be included in determining compliance with the emission limits in
par. (a).
NR 440.72(4)
(4) Performance tests and compliance provisions. NR 440.72(4)(b)
(b) The owner or operator of an affected facility shall conduct an initial performance test as required under
s. NR 440.08 (1) and thereafter a performance test each nominal 1-month period for each affected facility according to the procedures in this subsection.
NR 440.72(4)(b)1.
1. The owner or operator shall determine the composition of coatings by analysis of each coating, as received, using Method 24 of Appendix A,
40 CFR part 60, incorporated by reference in
s. NR 440.17 (1), from data that have been determined by the coating manufacturer using Method 24, or by other methods approved by the administrator.
NR 440.72(4)(b)2.
2. The owner or operator shall determine the volume of coating and the mass of VOC used for dilution of coatings from company records during each nominal 1-month period. If a common coating distribution system serves more than one affected facility or serves both affected and nonaffected spray booths, the owner or operator shall estimate the volume of coatings used at each facility by using procedures approved by the department.
NR 440.72(4)(b)2.a.
a. The owner or operator shall calculate the volume-weighted average mass of VOCs in coatings emitted per unit volume of coating solids applied (N) at each coating operation (i.e., for each type of coating used, prime, color, texture, or touch-up) during each nominal 1-month period for each affected facility. Each 1-month calculation is considered a performance test. Except as provided in
subd. 2. c., N will be determined by the following procedures:
1) Calculate the mass of VOCs used (M
o+ M
d) for each coating operation during each nominal 1-month period for each affected facility by the following equation: -
See PDF for diagram 
where n is the number of coatings of each type used during each nominal 1-month period and m is the number of different diluent VOCs used during each nominal 1-month period. (SLdj Ddj will be 0 if no VOCs are added to the coatings, as received.)
2) Calculate the total volume of coating solids consumed (L
s) in each nominal 1-month period for each coating operation for each affected facility by the following equation: -
See PDF for diagram
where n is the number of coatings of each type used during each nominal 1-month period.
3) Select the appropriate transfer efficiency (T) from Table 1 for each type of coating applications equipment used at each coating operation. If the owner or operator can demonstrate to the satisfaction of the administrator that transfer efficiencies other than those shown are appropriate, the administrator may approve their use on a case-by-case basis. Transfer efficiency values for application methods not listed below may be approved by the administrator on a case-by-case basis. An owner or operator shall submit sufficient data for the administrator to judge the validity of the transfer efficiency claims.
4) Where more than one application method is used within a single coating operation, the owner or operator shall determine the volume of each coating applied by each method through a means acceptable to the department and compute the volume-weighted average transfer efficiency by the following equation: -
See PDF for diagram
where n is the number of coatings of each type used and p is the number of application methods used
5) Calculate the volume-weighted average mass of VOCs emitted per unit volume of coating solids applied (N) during each nominal 1-month period for each coating operation for each affected facility by the following equation: -
See PDF for diagram
(Tavg = T when only one type of coating operation occurs).
NR 440.72(4)(b)2.b.
b. Where the volume-weighted average mass of VOCs emitted to the atmosphere per unit volume of coating solids applied (N) is less than or equal to 1.5 kilograms per liter for prime coats, is less than or equal to 1.5 kilograms per liter for color coats, is less than or equal to 2.3 kilograms per liter for texture coats, and is less than or equal to 2.3 kilograms per liter for touch-up coats, the affected facility is in compliance.
NR 440.72(4)(b)2.c.
c. If each individual coating used by an affected facility has a VOC content (kg VOC/l of solids), as received, which when divided by the lowest transfer efficiency at which the coating is applied for each coating operation results in a value equal to or less than 1.5 kilograms per liter for prime and color coats and equal to or less than 2.3 kilograms per liter for texture and touch-up coats, the affected facility is in compliance provided that no VOCs are added to the coatings during distribution or application.
NR 440.72(4)(b)2.d.
d. If an affected facility uses add-on controls to control VOC emissions and if the owner or operator can demonstrate to the administrator that the volume-weighted average mass of VOCs emitted to the atmosphere during each nominal 1-month period per unit volume of coating solids applied (N) is within each of the applicable limits expressed in
subd. 2. b. because of this equipment, the affected facility is in compliance. In such cases, compliance will be determined by the administrator on a case-by-case basis.
NR 440.72(5)(a)(a) The reporting requirements of
s. NR 440.08 (1) apply only to the initial performance test. Each owner or operator subject to the provisions of this section shall include the following data in the report of the initial performance test required under
s. NR 440.08 (1).
NR 440.72(5)(a)1.
1. Except as provided for in
subd. 2., the volume-weighted average mass of VOCs emitted to the atmosphere per volume of applied coating solids (N) for the initial nominal 1-month period for each coating operation from each affected facility.
NR 440.72(5)(a)2.
2. For each affected facility where compliance is determined under the provisions of
sub. (4) (b) 2. c., a list of the coatings used during the initial nominal 1-month period, the VOC content of each coating calculated from data determined using Method 24, of Appendix A,
40 CFR part 60, incorporated by reference in
s. NR 440.17 (1), and the lowest transfer efficiency at which each coating is applied during the initial nominal 1-month period.
NR 440.72(5)(b)
(b) Following the initial report, each owner or operator shall:
NR 440.72(5)(b)1.
1. Report the volume-weighted average mass of VOCs per unit volume of coating solids applied for each coating operation for each affected facility during each nominal 1-month period in which the facility is not in compliance with the applicable emission limits specified in
sub. (3). Reports of noncompliance shall be submitted on a quarterly basis, occurring every 3 months following the initial report; and
NR 440.72(5)(b)2.
2. Submit statements that each affected facility has been in compliance with the applicable emission limits specified in
sub. (3) during each nominal 1-month period. Statements of compliance shall be submitted on a semiannual basis.
NR 440.72(5)(c)
(c) These reports shall be postmarked not later than 10 days after the end of the periods specified in
par. (b).
NR 440.72(5)(d)
(d) Each owner or operator subject to the provisions of this section shall maintain at the source, for a period of at least 2 years, records of all data and calculations used to determine monthly VOC emissions from each coating operation for each affected facility as specified in
s. NR 440.07 (5).
NR 440.72(5)(e)
(e) Reporting and recordkeeping requirements for facilities using add-on controls will be determined by the administrator on a case-by-case basis.
NR 440.72(6)(a)1.
1. Method 24 for determination of VOC content of each coating as received.
NR 440.72(6)(a)2.
2. For Method 24, the sample shall be at least a 1-liter sample in a 1-liter container.
NR 440.72(6)(b)
(b) Other methods may be used to determine the VOC content of each coating if approved by the administrator before testing.
NR 440.72 History
History: Cr.
Register, September, 1990, No. 417, eff. 10-1-90; am. (2) (a) 1. a. and 4. (5) (d), renum. (2) (a) 6. to 14. to be (2) (a) 7. to 15. and am. (2) (a) 12. and 13., cr. (2) (a) 6.,
Register, July, 1993, No. 451, eff. 8-1-93;
CR 06-109: am. (4) (b) 1. and 2. a. 4) and (5) (a) 2. Register May 2008 No. 629, eff. 6-1-08; correction in (2) (a) 8. made under s. 13.92 (4) (b) 7., Stats., Register May 2008 No. 629. NR 440.73
NR 440.73 Calciners and dryers in mineral industries. NR 440.73(1)(1)
Applicability and designation of affected facility. NR 440.73(1)(a)(a) The affected facility to which this section applies is each calciner and dryer at a mineral processing plant. Feed and product conveyors are not considered part of the affected facility. For the brick and related clay products industry, only the calcining and drying of raw materials prior to firing of the brick are covered.
NR 440.73(1)(b)
(b) An affected facility that is subject to
s. NR 440.525, Metallic Mineral Processing Plants, is not subject to this section. Also, the following processes and process units used at mineral processing plants are not subject to this section: vertical shaft kilns in the magnesium compounds industry; the chlorination oxidation process in the titanium dioxide industry; coating kilns, mixers and aerators in the roofing granules industry; and tunnel kilns, tunnel dryers, apron dryers, and grinding equipment that also dries the process material used in any of the 17 mineral industries as defined in
sub. (2) (e).
NR 440.73(1)(c)
(c) The owner or operator of any facility under
par. (a) that commences construction, modification or reconstruction after April 23, 1986, is subject to this section.
NR 440.73(2)
(2) Definitions. All terms not defined in this section have the meanings given in
s. NR 440.02. In this section:
NR 440.73(2)(a)
(a) “Calciner" means the equipment used to remove combined (chemically bound) water and/or gases from mineral material through direct or indirect heating. This definition includes expansion furnaces and multiple hearth furnaces.
NR 440.73(2)(b)
(b) “Control device" means the air pollution control equipment used to reduce particulate matter emissions released to the atmosphere from one or more affected facilities.
NR 440.73(2)(c)
(c) “Dryer" means the equipment used to remove uncombined (free) water from mineral material through direct or indirect heating.
NR 440.73(2)(d)
(d) “Installed in series" means a calciner and dryer installed such that the exhaust gases from one flow through the other and then the combined exhaust gases are discharged to the atmosphere.
NR 440.73(2)(e)
(e) “Mineral processing plant" means any facility that processes or produces any of the following minerals, their concentrates or any mixture of which the majority (> 50%) is any of the following minerals or a combination of these minerals: alumina, ball clay, bentonite, diatomite, feldspar, fire clay, fuller's earth, gypsum, industrial sand, kaolin, lightweight aggregate, magnesium compounds, perlite, roofing granules, talc, titanium dioxide, and vermiculite.
NR 440.73(3)
(3) Standards for particulate matter. Each owner or operator of any affected facility that is subject to this section shall comply with the emission limitations in this subsection on and after the date on which the initial performance test required by
s. NR 440.08 is completed, but not later than 180 days after the initial startup, whichever date comes first. No emissions may be discharged into the atmosphere from any affected facility that does both of the following:
NR 440.73(3)(a)
(a) Contains particulate matter in excess of 0.092 gram per dry standard cubic meter (g/dscm) (0.040 grain per dry standard cubic foot (gr/dscf)) for calciners and for calciners and dryers installed in series and in excess of 0.057 g/dscm (0.025 gr/dscf) for dryers.
NR 440.73(3)(b)
(b) Exhibits greater than 10% opacity, unless the emissions are discharged from an affected facility using a wet scrubbing control device.
NR 440.73(4)
(4) Reconstruction. The cost of replacement of equipment subject to high temperatures and abrasion on processing equipment may not be considered in calculating either the “fixed capital cost of the new components" or the“fixed capital cost that would be required to construct a comparable new facility" under
s. NR 440.15. Calciner and dryer equipment subject to high temperatures and abrasion are: end seals, flights and refractory lining.
NR 440.73(5)(a)(a) With the exception of the process units described in
pars. (b),
(c) and
(d), the owner or operator of an affected facility subject to this section who uses a dry control device to comply with the mass emission standard shall install, calibrate, maintain and operate a continuous monitoring system to measure and record the opacity of emissions discharged into the atmosphere from the control device.
NR 440.73(5)(b)
(b) In lieu of a continuous opacity monitoring system, the owner or operator of a ball clay vibrating grate dryer, a bentonite rotary dryer, a diatomite flash dryer, a diatomite rotary calciner, a feldspar rotary dryer, a fire clay rotary dryer, an industrial sand fluid bed dryer, a kaolin rotary calciner, a perlite rotary dryer, a roofing granules fluid bed dryer, a roofing granules rotary dryer, a talc rotary calciner, a titanium dioxide spray dryer, a titanium dioxide fluid bed dryer, a vermiculite fluid bed dryer or a vermiculite rotary dryer who uses a dry control device may have a certified visible emissions observer measure and record 3 6-minute averages of the opacity of visible emissions to the atmosphere each day of operation in accordance with Method 9 of Appendix A of
40 CFR part 60, incorporated by reference in
s. NR 440.17.
NR 440.73(5)(c)
(c) The owner or operator of a ball clay rotary dryer, a diatomite rotary dryer, a feldspar fluid bed dryer, a fuller's earth rotary dryer, a gypsum rotary dryer, a gypsum flash calciner, a gypsum kettle calciner, an industrial sand rotary dryer, a kaolin rotary dryer, a kaolin multiple hearth furnace, a perlite expansion furnace, a talc flash dryer, a talc rotary dryer, a titanium dioxide direct or indirect rotary dryer or a vermiculite expansion furnace who uses a dry control device is exempt from the monitoring requirements of this subsection.
NR 440.73(5)(d)
(d) The owner or operator of an affected facility subject to this section who uses a wet scrubber to comply with the mass emission standard for any affected facility shall install, calibrate, maintain and operate monitoring devices that continuously measure and record the pressure loss of the gas stream through the scrubber and the scrubbing liquid flow rate to the scrubber. The pressure loss monitoring device shall be certified by the manufacturer to be accurate within 5% of water column gauge pressure at the level of operation. The liquid flow rate monitoring device shall be certified by the manufacturer to be accurate within 5% of design scrubbing liquid flow rate.
NR 440.73(6)(a)(a) Records of the measurements required in
sub. (5) shall be retained for at least 2 years.
NR 440.73(6)(b)
(b) Each owner or operator who uses a wet scrubber to comply with
sub. (3) shall determine and record once each day, from the recordings of the monitoring devices in
sub. (5) (d), an arithmetic average over a 2-hour period of both the change in pressure of the gas stream across the scrubber and the flowrate of the scrubbing liquid.
NR 440.73(6)(c)
(c) Each owner or operator shall submit written reports semiannually of exceedances of control device operating parameters required to be monitored by
sub. (5). For the purpose of these reports, exceedances are defined as follows:
