Sand Blasting & Metals Refinishing OperationsRefinishing Operations

An Environmental Impact View

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Acronym Key

BMP – Best Management PracticeMIL S Mili

PI-7 – Form that must be completed and sent to TCEQ for certain PBRsMIL Spec – Military

SpecificationPBR – Permit by Rule

TCEQ for certain PBRsVOC – Volatile Organic CompoundNESHAP N ti lPBR Permit by Rule

(ie: Chapter 106 authorization)

AC

NESHAP – National Emission Standard for Hazardous Air P ll t tMACT – Maximum

Achievable Control Technology

PollutantsHVLP – High Volume Low Pressure

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Types of Abrasives

Silica SandCoal SlaggCopper SlagGarnetMetal – Shot, GritGlassGlassWaterOthers – Dry Ice Nitrogen Sponge Jet

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Others – Dry Ice, Nitrogen, Sponge Jet

Advantages / Disadvantages

Purchase cost variesUsage rates varyUsage rates varyAbility to recycleD CDust CreationWaste Disposal issuesMIL Spec requirementsLocal regulatory requirements

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Local regulatory requirements

Coating Removal Technologies

Dry Abrasive BlastingSlurry BlastingSlurry Blasting

Ultra High Pressure Water Blastingj tµ-jet

Dry IceHigh Tech: Liquid Nitrogen, Laser…..

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Dry Abrasives

Dust ConcernsImpacts to SoilpImpacts to GroundwaterImpacts to Storm WaterWaste Disposal

Is it Hazardous???

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More Dry Abrasive Issues

Shrouding essentialCondition of shroudsHeight of shrouds

Number of nozzlesLbs / hr usage of abrasive per nozzleAir Pressure

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More Dry Abrasive Issues

Worker ProtectionProperty Line p yStandardNuisance ComplaintsAbility to permit

PBR very restrictiveChapter 116 permit difficult to obtain

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Ultra High Pressure Water

Minimal Air IssuesAbility to collect ywaste waterDisposal of Water $Availability of Source WaterVery Low Productivity

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Ultra High Pressure Water

Must collect waste water

Metal Products & Machinery CategoricalCategorical DischargeCould be Hazardous due to Lead

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µ-jetµ-jetSipco Patented Designp g

Ultra High Pressure Water+ Abrasives

More ProductiveLower Abrasive UsageNo DustHigh $ Equipment costMust be able to collect water

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jµ-jetModular Equipment

Self-ContainedEnvironmentally DesignedMi i i tMinimizes waste generationMinimizes Storm Water Concerns

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µ-jet In Use

Surfaces protected / contained

Prevent soil / storm water issues

L d t h dLess need to shroudNo permit required

PBR PI 7PBR, no PI-7

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Other Sipco Technology

Abrasive HoppersBlast PotsLoading / transfer systemsD i d fDesigned for minimal impact.

Reduced airReduced air emissionsReduced waste

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Coating Issues

Chapter 115 Rules for each industryLimits VOC contentApplicable to essentially ALL

Not just Major Sources (ie:Title V permits)

NESHAP MACT R lNESHAP MACT RulesOnly applicable to Major Sources

PBR t i tiPBR very restrictive:6 pounds / hr of VOCs (ie: 2 to 3 gallons per hour)

Old Standard Exemption authorized 30 lbs / hr max

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Old Standard Exemption authorized 30 lbs / hr. max.

Coating Technologies

Air SprayAirlessHVLPBrush / RolledPowder CoatElectrostaticElectrostatic

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Coating Technology Issues

Air SprayLow transfer efficiency(60%) highefficiency(60%), high over spray

AirlessBetter transfer eff. (75-80%)

HVLPHVLPBest transfer eff. (85%)

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Coating BMPs

Open Containers and Paint pumps on plastic or in containment

P il /Prevents soil / groundwater / storm water contaminationReduces potential for waste generation

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Coating BMPsEven Empty Containers should be on plastic / in containmentcontainmentEmpty container must have less than 1” of residue to be consideredresidue to be considered empty

OK to dry openIf d OK di iIf dry, OK to dispose in Class II waste if 5 Gallon or smaller

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Coating Issues

Paint Waste is a Universal Waste

No longer managed as “Hazardous Waste”Waste

No manifest requiredStill requires prudentStill requires prudent management

Does this look right?

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Other Issues

Compressed Air Source

Oil Leaks?Where is condensate

i ?going?Diesel Engine permanent mounted?p

Possible Air Permit issue.

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Other Issues

Beyond Blasting & Painting

Storm Water Concerns?P i it f t dProximity of stored materials to waterPollution Pathway?y

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