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Spray gun efficiency and emission factors.



A marble casting facility intends to switch to a
HVLP gel coat spray system from a conventional
spray system.   When implemented, the facility
should be able to show a reduction in releases on
the TRI form and on the local air emissions
inventory report.  Transfer efficiency assumption
for a  conventional spray system is about 25% vs
65% for an HVLP system.   EPA's current
emission guidance in AP-42 (Table 4.4.2) shows a
gel coat spray  emission factor range of 26 to 35 
for spraying gelcoat.

How should they determine what emission factor
to use for a HVLP and a conventional spray gun
so they may calculate a release reduction?  

Is there any relationship between the spray gun
transfer efficiency and the gel coat spray emission
factor range in Table 4.4.2?   

Thanks everyone,

Bill Quinn
Pollution Prevention Unit
AzDEQ
11/16/98
quinn.bill@ev.state.az.us