Reference method for measuring emissions of vinyl chloride from manufacturing: part III C-1
Part III - Calculations: Method C-1
Calculation of the Corrected Vinyl Chloride Concentration in Process Vents from Vinyl Chloride and Polyvinyl Chloride Plants
C-1.1 Scope
Calculations are described to correct the measured vinyl chloride concentration in the collected samples to the conditions stated in the emission standards.
C-1.2 Corrected Vinyl Chloride Concentration
Concentrations of vinyl chloride shall be calculated on a dry, undiluted basis. The concentration of vinyl chloride as measured in a sample and reported in method A-1 as Cb must be corrected for water vapour and a final concentration reported as Cf. Cf is to be calculated using equation C-1-1.
(C-1-1)
where
- Cf = corrected concentration of vinyl chloride, ppm
- Cb = concentration of vinyl chloride in sample, ppm
- Bwo = water vapour content of bag sample as calculated assuming the gas in the bag is saturated at the ambient conditions when sampled. If a condenser was used in the sampling train with ice, then the temperature shall be assumed to be 0°C.
C-1.3 Vinyl Chloride Concentration Corrected For Combustion Products
If incineration is used as a measure to control the vinyl chloride emissions, the stack gas composition is to be measured according to EPS 1-AP-74-1, Method C. Correct the vinyl chloride concentration to 10% oxygen using equation C-1-2.
(C-1-2)
where
- Cf ' = concentration of vinyl chloride corrected for water vapour and combustion products, ppm
- Cf = concentration of vinyl chloride in sample as obtained from equation C-1-1, ppm
- 20.9 = percentage of oxygen in normal air
- 10.9 = percentage of oxygen in normal air, less the 10 percent to which the correction is being made
- % O2 = percentage of oxygen in vent gases