South Coast Air Quality Management District
Worksheet For Form 400-E-4b
Abrasive Blasting Equipment (Other Than Portable/Open)
South Coast Air Quality Management District, Form 400-E-4b Engineer Evaluation (2014.07)
Page 1 of 1
Machine Emissions
R
1
,PM = x HP x 1- ( /200) = lb/hr x ( hrs/day)= lb/day
Uncontrolled PM Emissions (R
1
) Max lb/hr Max lb/day
R
2
PM = R
1
,PM x (1-.98) =
Controlled PM Emissions (R
2
) Max lb/hr Max lb/day
Abrasive Flow Rate (FR)
FR
1
=
ID =
ID
1
= FR = FR
1
x (ID/ID
1
) x /FR = x ( in
2
in
2
) x ( lb/ft
3
lb/ft
3
) =
=
=
1
1
Room or Cabinet Emissions
R
1
,PM = EF x FR x 1- ( /200) = lb/hr x ( hrs/day)= lb/day
Uncontrolled PM Emissions (R
1
) Max lb/hr Max lb/day
R
2
PM = R
1
,PM x (1-0.98) =
Controlled PM Emissions (R
2
) Max lb/hr Max lb/day
Exhaust Gas Total Particulate Concentration (PC)
lb PM/hr (Max) x 7,000 grains/lb
PC = =
grains/dscf
ft3/min x 60 min/hr
Room Cross Draft Velocity (Vc)
V
c
= VFR/W x H = CFM / ft x ft = FPM
Air Inlet Port Velocity (Vi)
V
i
= VFR/W x L = CFM / ft
2
= FPM
Cabinet Air Changes Per Minute (CAC)
CAC = VFR/W x L x H = CFM / ft
3
= FPM
Abrasive Blasting Cabinets
Item Required Actual Compliance
a. Air Changes Per Minute 10-20
Yes No
b. Baffled Air Inlet Ports Yes
Yes No
Abrasive Blasting Room Guidelines Review
Item Required Actual Compliance
a. Crossdraft/Downdraft Velocity (FPM)
Silica Type Abrasive 80
Yes No
Non-Silica Type Abrasive 50
Yes No
b. Air Port Opposite Exhaust Duct Yes
Yes No
c. Indraft Velocity (FPM) 500
Yes No