MDI Emissions Reporting Guidelines for the ... - Polyurethanes

MDI Emissions Reporting Guidelines for the Polyurethanes Industry
The total emissions from equipment leaks will be equal to the emissions contributed from each gas
valves, light liquid valves, light liquid pump seals, and connectors.
For gas valves:
For liquid valves:
K gas = 1.87 x 10 -6 *(C mdi ) 0.873
K liq = 6.41 x 10 -6 *(C mdi ) 0.787
For light liquid pump seals, compressor seals, pressure relief valves, agitator seals and heavy liquid
pump seals:
For connectors:
Where:
K pump = 1.90 x 10 -5 *(C mdi ) 0.824
K con = 3.05 x 10 -6 *(C mdi ) 0.885
K gas = the emission factor for gas valves in kg/year-item
K liq = the emission factor for liquid valves in kg/year-item
K pump = the emission factor for liquid pump seals in kg/year-item
K con = the emission factor for connectors in kg/year-item
For gas valves the emissions can then be estimated from the following expression:
L gas = K gas * n gas * K mdi * t pr * 2.205 lb/kg
Lgas = the annual losses from gas valves in lb/yr
ngas = the number of gas valves
Kmdi = the adjustment factor to the vapor pressure that is a function of
MDI concentration in the feedstock and the temperature
tpr = the total time in hours/year that the process is operating
For liquid valves the emissions can then be estimated from the following expression:
L liq = K liq * n liq * K mdi * t pr * 2.205 lb/kg
Lliq = the annual losses from liquid valves in lb/yr
nliq = the number of liquid valves
Kmdi = the adjustment factor to the vapor pressure that is a function of
MDI concentration in the feedstock and the temperature
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