DEQ-CFW_00086192

1 14 t
2008 Air Emissions Inventory Supporting Documentation
Emission Source ID No.: I-8
Emission Source Description: Abrasive Blasting Cabinets
Process and Emission Description:
The DuPont Company -Fayetteville Works has several self-contained abrasive blasting
cabinets located throughout the site. The function of these cabinets is to perform occasional
abrasive blasting of metal parts prior to painting.
Basis and Assumptions:
The abrasive blasting activity in these cabinets is very infrequent. Some cabinets are used
once or twice a year. However, for the purposes of this air emissions inventory, it will be
assumed that a extremely conservative high estimate exists where one ton of abrasive media
is consumed in each cabinet each month.
Per the AP-42 Section 13.2.6 particulate emission factors for abrasive blasting of mild steel
panels with a five mile per hour wind speed, total particulate matter emissions would be 27
pounds per 1,000 pounds of abrasive. The choice of this low wind speed is appropriate since
the blasting operation is conducted inside a cabinet.
Information Inputs and Source of Inputs:
Information Inputs
Source of Inputs
Total pounds of abrasive media
Assumed conservative high estimates
Point Source Emissions Determination:
For the purpose of this report, it is assumed that all emissions are fugitive.
Equipment Emissions and Fugitive Emissions Determination:
For the purpose of this report, it is assumed that all emissions are fugitive.
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DEQ-CFW 00086192

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Abrasive Blasting Cabinets
Fugitive Emission Determination
PM Emissions Determination
Fugitive Emission Determination
Page 2 of 2
The emission of particulate matter is determined by multiplying the total estimate of
abrasive media consumed by the AP-42 Section 13.2.6 particulate emission factors.
AP-42 Section 13.2.6 particulate emission 27 pounds total particulate matter
Factors for abrasive blasting of mild steel
panels with a five mile per hour wind speed emissions per 1,000 pounds of abrasive
Assumptions:
Abrasive Blasting Cabinets on -site
4 cabinets
Abrasive consumed per cabinet
1 ton / month
Abrasive consumed per cabinet
12 ton / year
Sitewide abrasive consumed
48 ton /year
48 tons abrasive X
year
2008 Particulate Matter Emissions
27 ton PM
1,000 ton abrasive
1.3 ton PM
year
Pollutant
Emissions
(ton/year)
Particulate Matter (TSP)
1.3
PMIO (< 10 micron)
1.3
PM2.5 (< 2.5 micron)
1.3
DEQ-CFW 00086193