Wisconsin Administrative Code › Department of Natural Resources › NR 400-499 - Environmental Protection - Air Pollution Control › Chapter NR 463 - National Emission Standards For Hazardous Air Pollutants For Metals Treating And Processing › Subchapter I - Chromium Emissions from Hard and Decorative Chromium Electroplating and Chromium Anodizing Tanks › Section NR 463.05 - Operation and maintenance practices

Current through June 24, 2024
(1) WORK PRACTICE
				  STANDARDS. All owners or operators subject to the standards in s.
				  NR
				  463.04(3) and (4) are subject to the
				  following work practice standards:
(a) At all
				  times, including periods of startup, shutdown and malfunction, owners or
				  operators shall operate and maintain any affected source, including associated
				  air pollution control devices and monitoring equipment, in a manner consistent
				  with good air pollution control practices, consistent with the operation and
				  maintenance plan required by sub. (2).
(b) Malfunctions shall be corrected as soon
				  as practicable after their occurrence in accordance with the operation and
				  maintenance plan required by sub. (2).
(c) Determination of whether acceptable
				  operation and maintenance procedures are being used will be based on
				  information available to the department, which may include, but is not limited
				  to, monitoring results; review of the operation and maintenance plan,
				  procedures and records; and inspection of the source.
(d) Based on the results of a determination
				  made under par. (c), the department may require that an owner or operator of an
				  affected source make changes to the operation and maintenance plan required by
				  sub. (2) for that source. Revisions may be required if the department finds
				  that the plan does any of the following:
1.
				  Does not address a malfunction that has occurred.
2. Fails to provide for the proper operation
				  of the affected source, the air pollution control techniques, or the control
				  system and process monitoring equipment during a malfunction in a manner
				  consistent with good air pollution control practices.
3. Does not provide adequate procedures for
				  correcting malfunctioning process equipment, air pollution control techniques
				  or monitoring equipment as quickly as practicable.
Table 1 Summary of Work Practice
					 Standards
Control technique
Work practice standards
Frequency
Composite mesh-pad (CMP) system
1. Visually inspect device to ensure there is
								  proper drainage, no chronic acid buildup on the pads, and no evidence of
								  chemical attack on the structural integrity of the device.
1. 1/quarter.
2. Visually inspect back portion of the mesh pad
								  closest to the fan to ensure there is no breakthrough of chromic acid
								  mist.
2. 1/quarter.
3. Visually inspect ductwork from tank to the
								  control device to ensure there are no leaks.
3. 1/quarter.
4. Perform washdown of the composite mesh-pads in
								  accordance with manufacturer's recommendations.
4. Per manufacturer.
Packed-bed scrubber (PBS)
1. Visually inspect device to ensure there is
								  proper drainage, no chromic acid buildup on the packed beds, and no evidence of
								  chemical attack on the structural integrity of the device.
1. 1/quarter.
2. Visually inspect back portion of the chevron
								  blade mist eliminator to ensure that it is dry and there is no breakthrough of
								  chromic acid mist.
2. 1/quarter.
3. Same as number 3 for CMP system.
3. 1/quarter.
4. Add fresh makeup water to the top of the
								  packed beda,b.
4. Whenever makeup is added.
PBS/CMP system
1. Same as for CMP system.
1. 1/quarter.
2. Same as for CMP.
2. 1/quarter.
3. Same as for CMP system.
3. 1/quarter.
4. Same as for CMP system.
4. Per manufacturer.
Fiber-bed mist
								  eliminatorc
1. Visually inspect fiber-bed unit and
								  prefiltering device to ensure there is proper drainage, no chromic acid buildup
								  in the units, and no evidence of chemical attack on the structural integrity of
								  the devices.
1. 1/quarter.
2. Visually inspect ductwork from tank or tanks
								  to the control device to ensure there are no leaks.
2. 1/quarter.
3. Perform washdown of fiber elements in
								  accordance with manufacturer's recommendations.
3. Per manufacturer
Air pollution control device not listed in
								  rule
To be proposed by the source for approval by the
								  department.
To be proposed by the source for approval by the
								  department.
Monitoring Equipment
Pitot tube
Backflush with water, or remove from the duct and
								  rinse with fresh water. Replace in the duct and rotate 180 degrees to ensure
								  that the same zero reading is obtained. Check pitot tube ends for damage.
								  Replace pitot tube if cracked or fatigued.
1/quarter.
Stalagmometer
Follow manufacturer's recommendations.
a If greater than 50% of the scrubber water is drained, for
					 purposes such as maintenance, makeup water may be added to the scrubber
					 basin.
b For horizontal-flow scrubbers, top is defined as the
					 section of the unit directly above the packing media such that the makeup water
					 would flow perpendicular to the air flow through the packing. For vertical-flow
					 units, the top is defined as the area downstream of the packing material such
					 that the makeup water would flow countercurrent to the air flow through the
					 unit.
c Work practice standards for the control device installed
					 upstream of the fiber-bed mist eliminator to prevent plugging do not apply as
					 long as the work practice standards for the fiber-bed unit are followed.