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

§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: Where: VOCW = 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; Vi = 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 Ci = 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 VT = 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 = ((VOCa – S)/VOCa)) x 100 Where: E = The required overall emission reduction efficiency of the control system for the day; VOCa = (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: Where: 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 liters (L) (gallons [gal]); 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 kg VOC/kg coating (lb/lb); Di = 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); VSi = 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);