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5a. Permit Limit
5a1. Permit Limit
PERC: 180 lb/month
25 ppm at outlet of carbon bed
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5a2. BACT/LAER Determination
The BACT/LAER determination for this degreasing operation is an airless vapor degreaser. The permit limit shown in Item (5a1) is the maximum allowable PERC mass emission rate and concentrations from the degreasing operation. A continuous emissions monitoring at the outlet of the carbon bed record concentrations of PERC. (See Item 6- Comment)
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5b. Control Technology
5b1. Manufacturer/Supplier
Serec Corporation
P.O. Box 28129
Providence, RI 02980
(401) 421-6080
5b2. Description: Name of Control(s):
Closed-loop airless vapor degreasing technology involves placing parts or baskets of parts into a cleaning chamber that is sealed after loading. The cleaning cycle is fully automated. Air is evacuated from the chamber by a vacuum pump to a pressure below 25 torr. Chamber pressure is brought back up to about 1 atmosphere and solvent is flashed into the chamber through a valve by pressure gradient. Condensation of solvent onto the parts to be cleaned occurs and provides the mechanism for cleaning. Once condensation ceases, all liquid and residual vapor phase solvent is distilled or routed to a refrigerated condenser to provide continuously clean solvent for further solvent degreasing. Any remaining vapor phase solvent residing in the cleaning chamber is routed to a carbon bed for adsorption. Waste oils, greases, and soils are separated from used solvents generally by refrigerated condensation, distillation, and filtering processes. The only source of air emissions occurring through the use of a properly maintained airless system occur at the outlet of the carbon bed and tiny amounts of vapor are released to atmosphere once the chamber door is opened. The sum of the two emission points result in very small concentrations of emissions per cycle.
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5b3. Control Equipment Permit Application Data
P/C No .: Same as Basic Equip
P/C Issuance Date:
P/O No.: Same as Basic Equip
P/O Issuance Date:
5b5. Warranty
Unknown
5b7. Secondary Pollutant
None
5b9. Limitations
There are no known limitations to airless vapor degreasers at this time.
5b11. Operating History
Operating since April 1996
5b13. Source Test Conditions/Performance Data
The performance data were recorded during normal loading conditions of the vapor degreaser (30 min/cycle for 80% of the time and 60 min/cycle for 20% of the time).
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5b4. Waste Air Flow to Control Equipment
Flow Rate: 250 ft3/evacuation
Actual VOC Loading: Unknown
Inlet Blower: N/A
5b6. Primary Pollutant
This airless vapor degreaser emits perchloroethylene (PERC). PERC is classified as hazardous air pollutant (HAP) and an exempt solvent under AQMD Rule 102 – Definition of Terms.
5b8. Space Requirement
500 square feet
5b10. Location of Prior Demonstration & Agency
Facility:
Contact Person:
Phone Number:
Agency:
Address:
Permit Number:
Contact Person:
5b12. Source Test/Performance Data Analysis
Date of Source Test: N/A
Capture Efficiency:
Destruction Efficiency:
Overall Efficiency:
Performance Data: The performance of the airless vapor degreaser is reflected in the make-up solvent logs and waste disposal records obtained from BF Goodrich Aerospace in 1998. These data demonstrated that PERC emissions are less than 180 lb per month. |
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5c. Cost
5c1. Control Equipment Cost
Capital: Unknown
Installation: Unknown
Capital + Installation: $750,000
Source of Cost Data:
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5c2. Annual Operational/Maintenance Cost
$38,900
Source of Cost Data: |
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5d. Demonstration of Compliance
5d1. Date of Field Evaluation
5d3. Compliance Demonstration
By SCAQMD Rule 109 Records and Waste Manifests
5d5. No. of Violations
None
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5d2. AQMD Staff Performing Field Evaluation
Engineer’s Name: Not Applicable
Inspector’s Name: Not Applicable
5d4. Variance
No. of Variances: None
Causes: Not Applicable
5d6. Frequency of Maintenance
Not Known |