Rhode Island Code of Regulations › Title 250 - Department of Environmental Management › Chapter 120 - Air Resources › Subchapter 05 - Air Pollution Control › Part 19 - Control of Volatile Organic Compounds from Surface Coating Operations (250-RICR-120-05-19) › Section 250-RICR-120-05-19.13 - VOC Calculations

Current through June 14, 2024
A. The VOC content
				  of the as applied coating, expressed in units of pounds of VOC per gallon of
				  coating, shall be calculated using equation 1:
Equation 1
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Where:
VOC = The VOC content of a given coating, in pounds per
					 gallon (lbs./gal);
Wv = Mass of total volatiles, in
					 pounds;
Wa = Mass of total VOC in additives
					 or other materials that are added to the coating prior to its application, in
					 pounds;
Ww = Mass of the water in coating
					 (if any), in pounds;
Wn = Mass of any non-VOC solvent in
					 the coating, in pounds;
V = Volume of coating, in gallons;
Va = Volume of VOC-containing
					 additives or other materials that are added to the coating prior to its
					 application, in gallons;
Vw = Volume of the water in coating
					 (if any), in gallons; and
Vn = Volume of any non-VOC solvent
					 in the coating, in gallons.
B. VOC content of the as applied coating,
				  expressed in units of pounds of VOC per pound of coating solids, shall be
				  calculated using equation 2:
Equation 2
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Where:
VOCB = VOC content in lbs. VOC/lb of
					 coating solids
Wo = Weight percent of VOC
					 (Wv-Ww-Wex)
Wv = Weight percent of total
					 volatiles (100%-weight percent solids)
Ww = Weight percent of water
Wex = Weight percent of exempt
					 solvents
Wn = Weight percent of solids of
					 the as applied coating
C.
				  The VOC content of the as applied coating, expressed in units of pounds of VOC
				  per gallon of coating solids, shall be calculated using equation 3:
Equation 3
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Where:
VOC = VOC Content in lbs. voc/gal of coating solids
Wo = Weight percent of VOC
					 (Wv-Ww-Wex)
Wv = Weight percent of total
					 volatiles (100%-weight percent solids)
Ww = Weight percent of water
Wex = Weight percent of exempt
					 solvents
DC = Density of coating, lb/gal, at
					 25°C
Vn = Volume percent of solids of
					 the as applied coating
D.
				  Procedure for Calculating the Daily-Weighted Averages
1. The daily-weighted average VOC content, in
				  units of mass of VOC per unit volume of coating, excluding water and exempt
				  compounds, as applied, of the coatings used on a day on a coating line or
				  operation shall be calculated using equation 4:
Equation 4
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					 here to view
Where:
VOCw = The daily-weighted average
					 VOC content of the coatings, as applied, used on a coating line or operation in
					 units of pounds of VOC per gallon of coating, excluding water and exempt
					 compounds;
n = The number of different coatings, as applied, each day
					 on a coating line or operation;
Vi = The volume of each coating (i),
					 as applied, used in a day on a coating line or operation in units of gallons,
					 excluding water and exempt compounds;
Ci = The VOC content of each coating
					 (i), as applied, used in a day on a coating line or operation in units of
					 pounds VOC per gallon of coating, excluding water and exempt compounds;
					 and,
VT = The total volume of all
					 coating, as applied, used in a day on a coating line or operation in units of
					 gallons, excluding water and exempt compounds.
2. The daily-weighted average VOC content, as
				  applied, of the coatings used on a coating line or operation in units of mass
				  of VOC per unit volume of coating solids shall be calculated by equation 5:
Equation 5
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					 here to view
VOCws = The daily-weighted average
					 VOC content, as applied, of the coatings used on a coating line or operation in
					 units of mass of VOC per unit volume of coating solids;
n = The number of different coatings, as applied, used in a
					 day on a coating line or operation;
Vi = The volume of each coating (i),
					 as applied, used in a day on a coating line or operation in units of
					 gallons,
WVOCi = The weight fraction of VOC
					 in each coating (i), as applied, used in a day on a coating line or operation
					 in units of pounds VOC per pound of coating;
Di = The density of each coating (i)
					 as applied, used in a day on a coating line or operation in units of pounds VOC
					 per gallon of coating (lb./gal); and
VSi = The volume fraction solids
					 content of each coating (i), as applied, used in a day on a coating line or
					 operation in units of gallons solids/gallons
					 coating.