OAR 340-232-0170: Aerospace Component Coating Operations

(1) No owner or operator of an aerospace component coating facility may emit into the atmosphere VOCs in excess of the following limits, expressed as pounds VOC per gallon of coating applied, excluding water and exempt solvents, unless an alternative emission limit is approved by DEQ pursuant to section (4) or emissions to the atmosphere are controlled to an equivalent level pursuant to section (10): (a) Primer — 2.9 pounds/gallon; (b) Interior Topcoat — 2.8 pounds/gallon; (c) Electric or Radiation Effect Coating — 6.7 pounds/gallon; (d) Extreme Performance Interior Topcoat — 3.5 pounds/gallon; (e) Fire Insulation Coating — 5.0 pounds/gallon; (f) Fuel Tank Coating — 6.0 pounds/gallon; (g) High Temperature Coating for conditions between 350° F. –500° F. — 6.0 pounds/gallon; (h) Sealant — 5.0 pounds/gallon; (i) Self-Priming Topcoat — 3.5 pounds/gallon; (j) Topcoat — 3.5 pounds/gallon; (k) Pretreatment Wash Primer — 3.5 pounds/gallon; (l) Sealant Bonding Primer — 6.0 pounds/gallon; (m) Temporary Protective Coating — 2.1 pounds/gallon; (2) Exemptions: This rule does not apply to the following: (a) The exterior of fully assembled airplanes painted out of doors, high temperature coatings (for conditions over 500° F.), adhesive bonding primer, flight test coatings, and space vehicle coatings; (b) Sources whose potential to emit from activities identified in section (1) before add on controls of VOCs are less than ten tons per year (or 3 pounds VOC/hour or 15 pounds VOC/day actual); (c) The use of separate coating formulations in volumes of less than 20 gallons per calendar year. No source may use more than a combined total of 250 gallons per calendar year of exempt coatings. Records of coating usage must be maintained as per section (8); or (d) Sources used exclusively for chemical or physical analysis or determination of product quality and coating performance (such as research facilities and laboratories) unless: (A) The operation of the source is an integral part of the production process; or (B) The emissions from the source exceed 363 kilograms (800 pounds) in any calendar month. (3) Exceptions: (a) On a case-by-case basis, DEQ may approve exceptions to the emission limits specified in section (1), upon documentation by the source that an alternative emission limit would satisfy the federal criteria for RACT; (b) Included in this documentation must be a complete analysis of technical and economic factors which: (A) Prevent the source from using both compliance coatings and air pollution control devices; and (B) Justify the alternative emission limit sought by the source. (c) The alternative emission limit approved by DEQ will be incorporated into the source's Air Contaminant Discharge Permit and will be effective upon approval by EPA as a source-specific SIP revision. (4) Applicability: This rule applies to each coating line, which includes the application area, flashoff area, air and forced air dryer, and oven used in the surface coating of aerospace components in subsections (1)(a) through (m) . If more than one emission limitation in this rule applies to a specific coating, then the most stringent emission limitation must be applied. (5) Solvent Evaporation Minimization: (a) Closed containers must be used for the storage or disposal of cloth or paper used for solvent surface preparation and cleanup; (b) Fresh and spent solvent must be stored in closed containers; (c) Organic compounds may not be used for the cleanup of spray equipment unless equipment is used to collect the cleaning compounds and to minimize their evaporation; (d) Containers of coating, catalyst, thinner, or solvent may not be left open to the atmosphere when not in use. (6) Stripper Limitations: No stripper may be used which contains more than 400 grams/liter (3.3 lbs./gal.) of VOC or which has a true vapor pressure of 1.3 kPa (0.19 psia) at actual usage temperature. (7) Maskant for Chemical Processing Limitation: No maskant may be applied for chemical processing unless the VOC emissions from coating operations are reduced by 85 percent, or the coating contains less than 600 grams of VOC per liter (5.0 pounds/gallon) of coating excluding water, as applied. (8) Compliance determination: Compliance with this rule must be determined by testing in accordance with 40 CFR part 60, Appendix A, Method 24 for determining the VOC content of the coating materials. Emissions from the coating processes and/or VOC emissions control efficiencies must be determined by testing in accordance with 40 CFR part 60, Appendix A, Method 18, 25, California Method ST-7, a material balance method, or an equivalent plant specific method approved by EPA and DEQ and on file with DEQ. The limit in section (1) of VOC in the coating is based upon an assumed solvent density, and other assumptions unique to a coating line; where conditions differ, such as a different solvent density, a plant specific limit may be submitted to DEQ and EPA for approval. (9) Reduction Method: The emission limits of section (1) must be achieved by: (a) The application of a low solvent content coating technology; (b) A vapor collection and disposal system; or (c) An equivalent means of VOC removal. The equivalent means must be approved by DEQ and will be incorporated in the source's Air Contaminant Discharge Permit or Title V Operating Permit, and will be effective upon approval by EPA as a source-specific SIP revision. Other alternative emission controls approved by DEQ and allowed by EPA may be used to provide an equivalent means of VOC removal. (10) Recordkeeping Requirements: (a) A current list of coatings must be maintained which provides all of the coating data necessary to evaluate compliance, including the following information, where applicable: (A) A daily record indicating the mix ratio of components used; and (B) The VOC content of the coating as applied. (b) A monthly record must be maintained indicating the type and amount of solvent used for cleanup and surface preparation; (c) A monthly record must be maintained indicating the amount of stripper used; (d) Such records must be retained and available for inspection by DEQ for a period of five years. [NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan that EQC adopted under OAR 340-200-0040.] [NOTE: View a PDF of California Test Methods by clicking on “Tables” link below.] [NOTE: View a PDF of referenced EPA Methods by clicking on “Tables” link below OAR 340-232-8010.] [ED. NOTE: To view attachments referenced in rule text, click here to view rule.]