MDI Emissions Reporting Guidelines for the ... - Polyurethanes

Fugitive Emissions (Non-point Source)
MDI Emissions Reporting Guidelines for the Polyurethanes Industry
Fugitive emissions are air releases of volatile chemicals that typically occur due to leaks from fittings
and seals in chemical process equipment, transfer operations or storage systems. Direct
measurement or monitoring data can be used to estimate fugitive emissions. In the absence of direct
measurement or monitoring data, industrial hygiene data on MDI concentrations in the workplace can
be used to estimate MDI or MDI/PMDI fugitive emissions. This technique can only be used if the
industrial hygiene data are representative of average concentrations throughout the year and
throughout the building.
The fugitive emissions can be estimated from the following expression:
Where:
L fg = C mdi * (V B / 359) * N year * (273.15 / T amb ) * M w * K f
Lfg = the fugitive emissions in lb/yr
Cmdi = the average MDI concentration, in ppmv, in the air within the building
VB = the volume of the workspace building in ft3 Nyear = the number of air exchanges per year
Tamb = the ambient temperature in K
Mw = the molecular weight of MDI (250.26)
Kfg = the adjustment factor to the MDI concentration in the building air. CPI uses a value of
1.10
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