W. Va. Code R. § 45-21-43

Current through Register Vol. XLI, No. 50, December 13, 2024

Section 45-21-43 - Test Methods and Compliance Procedures: Alternative Compliance Methods for Surface Coating

43.1. Daily-weighted average. -- The daily-weighted average VOC content, in units of mass of VOC per unit volume of coating, minus water and exempt compounds, as applied, of the coatings used on a day on a coating line or operation shall be calculated using the following equation:

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Where:

VOC_W = The daily-weighted average VOC content of the coatings, as applied, used on a coating line or operation in units of kilograms of VOC per liter of coating (kg VOC/L) (pounds of VOC per gallon of coating [lb VOC/gal]), minus water and exempt compounds;

n = The number of different coatings, as applied, each day on a coating line or operation;

V_i = The volume of each coating, as applied, each day on a coating line or operation in units of L (gal), minus water and exempt compounds; and

C_i = The VOC content of each coating, as applied, each day on a coating line or operation in units of kg VOC/L of coating (lb VOC/gal), minus water and exempt compounds; and

V_T = The total volume of all coating, as applied, each day on a coating line or operation in units of L (gal), minus water and exempt compounds.

43.2. Overall emission reduction efficiency for control systems. -- The overall emission reduction efficiency needed to demonstrate compliance is determined each day as follows:

43.2.1. Obtain the emission limitation from the applicable section of this regulation.

43.2.2. Calculate the emission limitation on a solids basis according to the following equation:

S = C/(1-(C/d))

Where:

S = The VOC emission limitation in terms of kg VOC/L of coating solids (lb VOC/gal);

C = The VOC emission limitation in terms of kg VOC/L of coating (lb/gal), minus water and exempt compounds; and

d = The density of VOC for converting emission limitation to a solids basis. The density equals 0.882 kg/L (7.36 lb/gal).

43.2.3. Calculate the required overall emission reduction efficiency of the control system for the day according to the following equation:

E = ((VOC_a - S)/VOC_a)) x 100

Where:

E = The required overall emission reduction efficiency of the control system for the day;

VOC_a = (1) The maximum VOC content of the coatings, as applied, used each day on the subject coating line or operation, in units of kg VOC/L of coating solids (lb/gal), as determined by the applicable test methods and procedures specified in section 42.; or (2) The daily-weighted average VOC content, as applied, of the coatings used each day on the subject coating line or operation, in units of kg VOC/L of coating solids (lb/gal), as determined by the applicable test methods and procedures specified in section 42. and the procedure in subdivision 43.2.4.; and

S = VOC emission limitation in terms of kg VOC/L of coating solids (lb VOC/gal).

43.2.4. 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 the following equation:

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Where:

VOC_WS = 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;

V_i = The volume of each coating (i), as applied, used in a day on a coating line or operation in units of liters (L) (gallons [gal]);

W_VOCi = The weight fraction of VOC in each coating (i), as applied, used in a day on a coating line or operation in units of kg VOC/kg coating (lb/lb);

D_i = The density of each coating (i), as applied, used in a day on a coating line or operation in units of kg coating/L of coating (lb/gal);

VS_i = The volume fraction solids content of each coating (i), as applied, used on a day on a coating line or operation in units of L solids/L coating (gal/gal);

W. Va. Code R. § 45-21-43