(d)Combustion (except flare) and recovery control device performance test procedures.(1) All testing equipment shall be prepared and installed as specified in the appropriate test methods.(2) All testing shall be performed during the last 20 percent of loading of a tank or compartment.(3) All emission testing intervals shall consist of each 5 minute period during the performance test. For each interval, the following shall be performed: (i)Readings. The reading from each measurement instrument shall be recorded.(ii)Sampling Sites. Method 1 or 1A of appendix A of part 60 of this chapter, as appropriate, shall be used for selection of sampling sites. Sampling sites shall be located at the inlet and outlet of the combustion device or recovery device except for owners or operators complying with the 1,000 ppmv VOC emissions limit for gasoline vapors under § 63.563(b)(6) or (7) , where the sampling site shall be located at the outlet of the recovery device.(iii)Volume exhausted. The volume exhausted shall be determined using Method 2, 2A, 2C, or 2D of appendix A of part 60 of this chapter, as appropriate.(4)Combustion devices, except flares. The average VOC concentration in the vent upstream and downstream of the control device shall be determined using Method 25 of appendix A of part 60 of this chapter for combustion devices, except flares. The average VOC concentration shall correspond to the volume measurement by taking into account the sampling system response time.(5)Recovery devices. The average VOC concentration in the vent upstream and downstream of the control device shall be determined using Method 25A or 25B of appendix A-7 to part 60 of this chapter for recovery devices. The average VOC concentration shall correspond to the volume measurement by taking into account the sampling system response time.(6) The VOC mass at the inlet and outlet of the combustion or recovery device during each testing interval shall be calculated as follows: Mj = FKVs CVOC
Where:
Mj = mass of VOC at the inlet and outlet of the combustion or recovery device during testing interval j, kilograms (kg).
F = 10-6 = conversion factor, (cubic meters VOC/cubic meters air)(1/ppmv) (m3 VOC/m3 air)(1/ppmv).
K = density, kilograms per cubic meter (kg/m3 VOC), standard conditions, 20 °C and 760 mm Hg.
Vs = volume of air-vapor mixture at the inlet and outlet of the combustion or recovery device, cubic meters (m3) at standard conditions, 20 °C and 760 mm Hg.
CVOC = VOC concentration (as measured) at the inlet and outlet of the combustion or recovery device, ppmv, dry basis.
s = standard conditions, 20 °C and 760 mm Hg.
(7) The VOC mass emission rates at the inlet and outlet of the recovery or combustion device shall be calculated as follows: View Image
Where:
Ei, Eo = mass flow rate of VOC at the inlet (i) and outlet (o) of the recovery or combustion device, kilogram per hour (kg/hr).
Mij, Moj = mass of VOC at the inlet (i) or outlet (o) during testing interval j, kg.
T = Total time of all testing intervals, hour.
n = number of testing intervals.
(8) Where Method 25, 25A, or 25B is used to measure the percent reduction in VOC, the percent reduction across the combustion or recovery device shall be calculated as follows: View Image
Where:
R = control efficiency of control device, percent.
Ei = mass flow rate of VOC at the inlet to the combustion or recovery device as calculated under paragraph (c)(7) of this section, kg/hr.
Eo = mass flow rate of VOC at the outlet of the combustion or recovery device, as calculated under paragraph (c)(7) of this section, kg/hr.
(9) Repeat the procedures in paragraph (d)(1) through (d)(8) of this section 3 times. The arithmetic average percent efficiency of the three runs shall determine the overall efficiency of the control device.(10) Use of methods other than Method 25, 25A, or 25B shall be validated pursuant to Method 301 of appendix A to part 63 of this chapter.