Wisconsin Administrative Code
Department of Natural Resources
NR 400-499 - Environmental Protection - Air Pollution Control
Chapter NR 469 - Emission standards for hazardous air pollutants for halogenated solvent cleaning operations
Section NR 469.06 - Operational requirements associated with control devices for batch vapor and in-line cleaning machines

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).

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).

1. Ensure that the cover opens only for part entrance and removal and completely covers the cleaning machine openings when closed.

2. Ensure that the working-mode cover is maintained free of cracks, holes and other defects.

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.

2. Ensure that the idling-mode cover is maintained free of cracks, holes and other defects.

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).

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.

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.

2. Ensure that the manufacturer's specifications for determining the minimum proper dwell time within the superheated vapor system is followed.

3. Ensure that parts remain within the superheated vapor for at least the minimum proper dwell time.

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.

2. Ensure that the carbon adsorber bed is not bypassed during desorption.

3. Ensure that the lip exhaust is located above the solvent cleaning machine cover so that the cover closes below the lip exhaust level.

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.

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.

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

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

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.

4. Ensure squeegees are replaced at or before the maximum product throughput is attained.

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.

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.

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

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

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.

1. Determine the system parameter and value that demonstrate to the department's satisfaction that the system is properly operating.

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

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

4. Redetermine the proper parameter value if any solvent film is visible on the continuous web part immediately after it exits the cleaning machine.