Post on 13-Jan-2016
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May 4, 2004Sacramento
Thermal Spraying Thermal Spraying ATCM Public ATCM Public WorkshopWorkshop
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• Introductions
• ARB’s Toxics Program
• Thermal Spraying Project– Background
– Project Goals
– Completed & Ongoing Activities
– Regulatory Concepts
– Schedule
Agenda
Thermal Spraying Public Workshop - May 2004
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Identification of Toxic Air Contaminants
Airborne Toxic Control Measures
Air Toxics “Hot Spots” (AB2588)
Neighborhood Air Monitoring
Risk Reduction Guidelines
ARB’s Toxics Program
Thermal Spraying Public Workshop - May 2004
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Background:What is thermal spraying?
Metals are sprayed onto a surface in a molten (or nearly molten) condition to form a coating.
Includes: - Flame Spraying - Plasma Spraying - Twin-Wire Electric Arc - HVOF - Detonation Gun
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
Spray Gun
Feed Material
Oxygen & Fuel Gas orElectric Arc
Molten Metal
Background:
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Background:• Materials may contain chromium,
nickel, and other toxic air contaminants
• Can generate air emissions of hexavalent chromium & nickel
• Used in a wide variety of industries, particularly aerospace
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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Control Devices:• Most common is dry filter cartridge• Others include: HEPA Filter, Water
Curtain, Wet Scrubber, and Baghouse• Control Efficiency ratings can be
assigned, based on standardized tests:
HEPA Filter - 99.97% @ 0.3 umDry Filter - 99.999% @ 0.5 um
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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Project Goals: • Characterize thermal spray
industry
• Quantify toxic air emissions
• Determine extent of health risks
• Implement risk reduction measures
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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ARB’s Thermal Spraying Project
Why ? • Board request• Potential use as replacement for hard
chromium electroplating• Hexavalent chromium is very toxic • Nickel can cause cancer & other health
effects• Community Health/Environmental Justice
Thermal Spraying Public Workshop - May 2004
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Completed Activities• 2003 Survey of Thermal Spraying
Material Manufacturers
• 2004 Survey of Thermal Spraying Facilities
• Air Dispersion Modeling
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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Key Findings from Surveys:• 103 tons of thermal spraying materials sold in CA in
2002
• Materials contained 18 tons of chromium and 34 tons of nickel
• The aerospace industry uses more than 1/3 of the materials
• CA has 47 active thermal spraying facilities
• Most facilities have control devices
• More than 1/2 of facilities use chromium-containing materials
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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Key Findings from Surveys:
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
47 Total Active Facilities = 30 Permitted
17 Unpermitted
41 Have Control Devices
64 %
36 %
87 %
16 Have HEPA Filters 34 %
24 Use Products w/Chromium
51 %
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Ongoing Activities• Statewide Emission Inventory
• Health Risk Assessment
• Cost Analysis
• Initial Statement of Reasons
• Draft Regulatory Language
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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Emission Estimates• Working with districts to
develop emission estimation methodology
• Based on stack tests, scientific research, and industry data
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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Current Requirements• Air Permits
• Toxics New Source Review
• AB 2588
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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Regulatory Concepts• New Facilities - 99.97% @ 0.3 um
• Existing Facilities - Control efficiency requirements would vary, depending on health risk & cost
• Permitting & Recordkeeping
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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Regulatory ConceptsExisting Facilities - Point Sources:
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
90%Low Threshold
99.999% @ 0.5 umMedium Threshold
Required Control Efficiency
Annual Toxic Emissions
(lbs/yr)
99.97% @ 0.3 umHigh Threshold
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Regulatory ConceptsExisting Facilities - Volume Sources:
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
99%Low Threshold
99.999% @ 0.5 umMedium Threshold
Required Control Efficiency
Annual Toxic Emissions
(lbs/yr)
99.97% @ 0.3 umHigh Threshold
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Regulatory ConceptsNew Facilities:
Required Control Efficiency: 99.97% @ 0.3 um
All Facilities:
Permitting & Recordkeeping Future Compliance Date
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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Summary•Thermal spraying generates toxic air
emissions.
•ARB is working on an ATCM regulation to control toxic emissions & protect public health.
•The ATCM would be based on the use of BACT in consideration of health risk and cost.
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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Schedule•June 23 2nd Public Workshop
•September Proposed Regulation and
Staff Report Available -
Public has 45 days to comment
•October 21 Tentative Board Hearing Date
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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Public Involvement •Website:
http://www.arb.ca.gov/coatings/thermal/thermal.htm
•Sign up for List Server to get updates
•Attend Workshops (can be done by phone)
•Provide Comments
•Meet with ARB
•Attend Board Hearing (can participate via internet)
ARB’s Thermal Spraying Project
Thermal Spraying Public Workshop - May 2004
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Monique Spears Davis, P.E.mdavis@arb.ca.gov(916) 324-8182
Jose Gomez, Managerjgomez@arb.ca.gov(916) 324-8033
ARBStationary Source DivisionMeasures Assessment Branch1001 I Street, P.O. Box 2815Sacramento, CA 95812
ARB Points of Contact
Thermal Spraying Public Workshop - May 2004
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QUESTIONS?
Thermal Spraying Public Workshop - May 2004