Chapter NR 469

NR 469.04 Note Note: Owners and operators who choose to comply with an idling emission limit should also refer to s. NR 469.07.

NR 469.04(4) (4) Upon written application, the administrator may approve the use of equipment or procedures after they have been satisfactorily demonstrated to be equivalent, in terms of reducing emissions of methylene chloride, perchloroethylene, trichloroethylene, 1,1,1-trichloroethane, carbon tetrachloride or chloroform to the atmosphere, to those prescribed for compliance within a specified paragraph of this chapter. The application shall contain a complete description of the equipment or procedure and the proposed equivalency testing procedure and the date, time and location scheduled for the equivalency demonstration.

NR 469.04 History History: Cr. Register, March, 1997, No. 495, eff. 4-1-97; CR 07-105: am. (1) (intro.), (d), (2) (a) 1., (b) 1., (3) (intro.), (a) 1. and (b) 1., cr. (4) Register December 2008 No. 636, eff. 1-1-09.

NR 469.05 NR 469.05 Work and operational practice standards for batch vapor and in-line cleaning machines. Except as provided in s. NR 469.08 for all cleaning machines, each owner or operator of an existing or new batch vapor or in-line solvent cleaning machine shall meet all of the following required work and operational practices, as applicable. The owner or operator of a continuous web cleaning machine shall comply with the requirements of s. NR 469.073 or 469.077, as appropriate, in lieu of complying with this section.

NR 469.05(1) (1) Control air disturbances across the cleaning machine openings by incorporating the control equipment or techniques in par. (a) or (b).

NR 469.05(1)(a) (a) Covers to each solvent cleaning machine shall be in place during the idling mode, and during the downtime mode unless either the solvent has been removed from the machine or maintenance or monitoring is being performed that requires the covers to not be in place.

NR 469.05(1)(b) (b) A reduced room draft as described in s. NR 469.06 (2) (b) shall be used.

NR 469.05(2) (2) The parts baskets or the parts being cleaned in an open-top batch vapor cleaning machine may not occupy more than 50% of the solvent/air interface area unless the parts baskets or parts are introduced at a speed of 0.9 meters per minute (3 feet per minute) or less.

NR 469.05(3) (3) Any spraying operations shall be done within the vapor zone or within a section of the solvent cleaning machine that is not directly exposed to the ambient air, such as a baffled or enclosed area.

NR 469.05(4) (4) Parts shall be oriented so that the solvent drains from them freely. Parts having cavities or blind holes shall be tipped or rotated before being removed from any solvent cleaning machine unless an equally effective approach has been approved by the department.

NR 469.05(5) (5) Parts baskets or parts may not be removed from any solvent cleaning machine until dripping has stopped.

NR 469.05(6) (6) During startup of each vapor cleaning machine, the primary condenser shall be turned on before the sump heater.

NR 469.05(7) (7) During shutdown of each vapor cleaning machine, the sump heater shall be turned off and the solvent vapor layer allowed to collapse before the primary condenser is turned off.

NR 469.05(8) (8) When solvent is added or drained from any solvent cleaning machine, the solvent shall be transferred using threaded or other leakproof couplings and the end of the pipe in the solvent sump shall be located beneath the liquid solvent surface.

NR 469.05(9) (9) Each solvent cleaning machine and associated controls shall be maintained as recommended by the manufacturers of the equipment or using alternative maintenance practices that have been demonstrated to the department’s satisfaction to achieve the same or better results as those recommended by the manufacturer.

NR 469.05(10) (10) Each operator of a solvent cleaning machine shall complete and pass the applicable sections of the test of solvent cleaning procedures in Table 5 if requested during an inspection by the department.

NR 469.05(11) (11) Waste solvent, still bottoms and sump bottoms shall be collected and stored in closed containers. The closed containers may contain a device that allows pressure relief, but that device may not allow liquid solvent to drain from the container.

NR 469.05(12) (12) Sponges, fabric, wood and paper products may not be cleaned.

NR 469.05(13) (13) If the solvent cleaning machine is not exempt under s. NR 423.03 (2) (a), (b), (d), (e) or (h), but is exempt under s. NR 423.03 (2) (i), it may not be operated so as to allow water to be visually detectable in solvent exiting the water separator.

NR 469.05(14) (14) If the solvent cleaning machine is not exempt under s. NR 423.03 (2) (a), (b), (d), (e), (f) or (h), but is exempt under s. NR 423.03 (2) (i), a permanent conspicuous label, summarizing the work and operational practices specified in subs. (1) to (9) and (11) to (13), shall be provided.

Table 5. Test of Solvent Cleaning Procedures

- See PDF for table

- See PDF for table

Control Device Specific Questions

- See PDF for table

NR 469.05 History History: Cr. Register, March, 1997, No. 495, eff. 4-1-97; CR 07-105: am. (intro.) and (10) Register December 2008 No. 636, eff. 1-1-09.

NR 469.06 NR 469.06 Operational requirements associated with control devices for batch vapor and in-line cleaning machines. Each owner or operator of a solvent cleaning machine complying with s. NR 469.04 (2) or (3) or s. NR 469.073 or 469.077 shall comply with the requirements specified in this section.

NR 469.06(1) (1) Conduct monitoring of each control device used to comply with s. NR 469.04 as provided in s. NR 469.10.

NR 469.06(2) (2) Determine during each monitoring period whether each control device used to comply with these standards meets the requirements specified in pars. (a) to (k).

NR 469.06(2)(a) (a) If a freeboard refrigeration device is used to comply with these standards, the owner or operator shall ensure that the chilled air blanket temperature, in °F, measured at the center of the air blanket, is no greater than 30% of the solvent’s boiling point.

NR 469.06(2)(b) (b) If a reduced room draft is used to comply with these standards, the owner or operator shall comply with the following requirements:

NR 469.06(2)(b)1. 1. Ensure that the flow or movement of air across the top of the freeboard area of the solvent cleaning machine or within the solvent cleaning machine enclosure does not exceed 15.2 meters per minute (50 feet per minute) at any time as measured using the procedures in s. NR 469.10 (4).

NR 469.06(2)(b)2. 2. Establish and maintain the operating conditions under which the wind speed was demonstrated to be 15.2 meters per minute (50 feet per minute) or less as described in s. NR 469.10 (4).

NR 469.06(2)(c) (c) If a working-mode cover is used to comply with these standards, the owner or operator shall comply with the following requirements:

NR 469.06(2)(c)1. 1. Ensure that the cover opens only for part entrance and removal and completely covers the cleaning machine openings when closed.

NR 469.06(2)(c)2. 2. Ensure that the working-mode cover is maintained free of cracks, holes and other defects.

NR 469.06(2)(d) (d) If an idling-mode cover is used to comply with these standards, the owner or operator shall comply with the following requirements:

NR 469.06(2)(d)1. 1. Ensure that the cover is in place whenever parts are not in the solvent cleaning machine and completely covers the cleaning machine openings when in place.

NR 469.06(2)(d)2. 2. Ensure that the idling-mode cover is maintained free of cracks, holes and other defects.

NR 469.06(2)(e) (e) If dwell is used to comply with these standards, the owner or operator shall comply with the following requirements:

NR 469.06(2)(e)1. 1. Determine the appropriate dwell time for each type of part or parts basket, or determine the maximum dwell time using the most complex part type or parts basket, as described in s. NR 469.09 (4).

NR 469.06(2)(e)2. 2. Ensure that, after cleaning, each part is held in the solvent cleaning machine freeboard area above the vapor zone for the dwell time determined for that particular part or parts basket, or for the maximum dwell time determined using the most complex part type or parts basket.

NR 469.06(2)(f) (f) If a superheated vapor system is used to comply with these standards, the owner or operator shall comply with the following requirements:

NR 469.06(2)(f)1. 1. Ensure that the temperature of the solvent vapor at the center of the superheated vapor zone is at least 5.6°C (10°F) above the solvent’s boiling point.

NR 469.06(2)(f)2. 2. Ensure that the manufacturer’s specifications for determining the minimum proper dwell time within the superheated vapor system is followed.

NR 469.06(2)(f)3. 3. Ensure that parts remain within the superheated vapor for at least the minimum proper dwell time.

NR 469.06(2)(g) (g) If a carbon adsorber in conjunction with a lip exhaust or other exhaust internal to the cleaning machine is used to comply with these standards, the owner or operator shall comply with the following requirements:

NR 469.06(2)(g)1. 1. Except as provided in subd. 4., ensure that the concentration of organic solvent in the exhaust from the carbon adsorber does not exceed 100 parts per million of any halogenated HAP compound as measured using the procedure in s. NR 469.10 (5). If the halogenated HAP solvent concentration in the carbon adsorber exhaust exceeds 100 parts per million, the owner or operator shall adjust the desorption schedule or replace the disposable canister, if not a regenerative system, so that the exhaust concentration of halogenated HAP solvent is brought below 100 parts per million.

NR 469.06(2)(g)2. 2. Ensure that the carbon adsorber bed is not bypassed during desorption.

NR 469.06(2)(g)3. 3. Ensure that the lip exhaust is located above the solvent cleaning machine cover so that the cover closes below the lip exhaust level.

NR 469.06(2)(g)4. 4. For each batch vapor or in-line vapor cleaning machine that is not exempt under s. NR 423.03 (2) (a), (b), (d), (e) or (h), but is exempt under s. NR 423.03 (2) (i), ensure that the concentration of organic solvent in the exhaust from the carbon adsorber does not exceed 25 parts per million of solvent as measured using the procedure in s. NR 469.10 (5). If the solvent concentration in the carbon adsorber exhaust exceeds 25 parts per million, the owner or operator shall adjust the desorption schedule or replace the disposable canister, if not a regenerative system, so that the exhaust concentration of solvent is brought below 25 parts per million.

NR 469.06 Note Note: Subdivision 4. contains pertinent language previously applicable under s. NR 423.03 (4) (c) 4. and (5) (c) 2., and now applicable under this chapter instead, to owners and operators of batch vapor cleaning machines and in-line vapor cleaning machines that use solvents that contain halogenated HAP compounds that are also VOCs.

NR 469.06(2)(h) (h) If a superheated part system is used to comply with the standards for continuous web cleaning machines in s. NR 469.073, the owner or operator shall ensure that the temperature of the continuous web part is at least 10 degrees Fahrenheit above the solvent boiling point while the part is traveling through the cleaning machine.

NR 469.06(2)(i) (i) If a squeegee system is used to comply with the continuous web cleaning requirements of s. NR 469.073 (3) (c) or 469.077 (2) (a), the owner or operator shall comply with the following requirements:

NR 469.06(2)(i)1. 1. Determine the appropriate maximum product throughput for the squeegees used in the squeegee system, as described in s. NR 469.09 (6).

NR 469.06(2)(i)2. 2. Conduct the weekly monitoring required by s. NR 469.10 (1) (c). Record the results required by s. NR 469.11 (1) (f).

NR 469.06(2)(i)3. 3. Calculate the total amount of continuous web product processed since the squeegees were replaced and compare to the maximum product throughput for the squeegees.

NR 469.06(2)(i)4. 4. Ensure squeegees are replaced at or before the maximum product throughput is attained.

NR 469.06(2)(i)5. 5. Redetermine the maximum product throughput for the squeegees if any solvent film is visible on the continuous web part immediately after it exits the cleaning machine.

NR 469.06(2)(j) (j) If an air knife system is used to comply with the continuous web cleaning requirements of s. NR 469.073 (3) (c) or 469.077 (2) (a), the owner or operator shall comply with the following requirements:

NR 469.06(2)(j)1. 1. Determine the air knife parameter and parameter value that demonstrate to the department’s satisfaction that the air knife is properly operating. An air knife is properly operating if no visible solvent film remains on the continuous web part after it exits the cleaning machine.

NR 469.06(2)(j)2. 2. Maintain the selected air knife parameter value at the level determined in s. NR 469.04 (1).

NR 469.06(2)(j)3. 3. Conduct the weekly monitoring required by s. NR 466.10 (1) (c).

NR 469.06(2)(j)4. 4. Redetermine the proper air knife parameter value if any solvent film is visible on the continuous web part immediately after it exits the cleaning machine.

NR 469.06(2)(k) (k) If a combination squeegee and air knife system is used to comply with the continuous web cleaning requirements of s. NR 469.073 (3) (c) or 469.077 (2) (a), the owner or operator shall comply with the following requirements:

NR 469.06(2)(k)1. 1. Determine the system parameter and value that demonstrate to the department’s satisfaction that the system is properly operating.

NR 469.06(2)(k)2. 2. Maintain the selected parameter value at the level determined in s. NR 469.04 (1).

NR 469.06(2)(k)3. 3. Conduct the weekly monitoring required by s. NR 469.10 (1) (c).

NR 469.06(2)(k)4. 4. Redetermine the proper parameter value if any solvent film is visible on the continuous web part immediately after it exits the cleaning machine.

NR 469.06(3) (3) If any of the requirements of sub. (2) are not met, determine whether an exceedance has occurred using the criteria in pars. (a) and (b).

NR 469.06(3)(a) (a) An exceedance has occurred if the requirements of sub. (2) (b) 2., (c) 1., (d) 1., (e), (f) 2. or 3. or (g) 2. or 3. have not been met.

NR 469.06(3)(b) (b) An exceedance has occurred if the requirements of sub. (2) (a), (b) 1., (c) 2., (d) 2., (f) 1. or (g) 1. have not been met and the condition is not corrected within 15 days of detection. Adjustments or repairs shall be made to the solvent cleaning system or control device to reestablish required levels. The parameter shall be remeasured immediately upon adjustment or repair and demonstrated to be within required limits.

NR 469.06(4) (4) The owner or operator shall report all exceedances and all corrections and adjustments made to avoid an exceedance as specified in s. NR 469.12 (7).

NR 469.06 History History: Cr. Register, March, 1997, No. 495, eff. 4-1-97; CR 07-105: am. (intro.), (2) (intro.) and (g) (intro.), cr. (2) (h) to (k) Register December 2008 No. 636, eff. 1-1-09.

NR 469.07 NR 469.07 Idling emission limit standards for batch vapor and in-line cleaning machines. Each owner or operator of a batch vapor or in-line solvent cleaning machine complying with the idling emission limit standards in s. NR 469.04 (2) (a) 2. or (b) 2. or (3) (a) 2. or (b) 2. shall comply with the requirements specified in this section.

NR 469.07(1) (1) Conduct an initial performance test to comply with the following requirements:

NR 469.07(1)(a) (a) Demonstrate compliance with the applicable idling emission limit.

NR 469.07(1)(b) (b) Establish parameters that will be monitored to demonstrate compliance. If a control device is used that is listed in s. NR 469.06 (2), then the requirements for that control device as listed in s. NR 469.06 (2) shall be used unless the owner or operator can demonstrate to the department’s satisfaction that an alternative strategy is equally effective.

NR 469.07(2) (2) Conduct the periodic monitoring of the parameters used to demonstrate compliance as described in s. NR 469.10 (6).

NR 469.07(3) (3) Operate the solvent cleaning machine within parameters identified in the initial performance test.

NR 469.07(4) (4) If any of the requirements in subs. (1) to (3) are not met, determine whether an exceedance has occurred using the following criteria:

NR 469.07(4)(a) (a) If using a control device listed in s. NR 469.06 (2), the owner or operator shall comply with the appropriate parameter values in s. NR 469.06 (2) and the exceedance delineations in s. NR 469.06 (3) (a) and (b).

NR 469.07(4)(b) (b) If using a control device not listed in s. NR 469.06 (2), the owner or operator shall indicate whether the exceedance of the parameters that are monitored to determine the proper functioning of this control would be classified as an immediate exceedance or whether a 15 day repair period would be allowed. This information shall be submitted to the department for approval.

NR 469.07(5) (5) The owner or operator shall report all exceedances and all corrections and adjustments made to avoid an exceedance as specified in s. NR 469.12 (7).

NR 469.07 History History: Cr. Register, March, 1997, No. 495, eff. 4-1-97.

NR 469.073 NR 469.073 Control device and operational requirements for continuous web cleaning machines. Except as provided in ss. NR 469.077 and 469.08 for remote reservoir continuous web cleaning machines, each owner or operator of a continuous web cleaning machine shall comply with subs. (1) to (4) for each continuous web cleaning machine.

NR 469.073(1) (1) Except as provided in sub. (2), install, maintain and operate one of the following control combinations on each continuous web cleaning machine:

NR 469.073(1)(a) (a) For each existing continuous web cleaning machine, the following control combinations are allowed:

NR 469.073(1)(a)1. 1. Superheated vapor or superheated part technology and a freeboard ratio of 1.0 or greater.