The fugitive emissions of a highly reactive organic compound, compound A$,$ from the valves

at a small synthetic organic chemical production unit must be estimated. Valve counts, mass

fraction VOC, mass fraction of A in the VOC portion of the components, and screening

concentrations for this unit are given in the table below. Estimate the fugitive emissions of

A from the valves in kg$/$yr using the leak$/$no$-$leak emission factors from table $2($tutorial $1)$

and the facility$-$specific correlations for valves developed by bagging the components. The

facility$-$specific correlations are

E$($g$/$hr$)=0\mathrm{.}00033$C$0\mathrm{.}86$

$($C$>0\mathrm{.}1)$ and

E$($lb$/$hr$)=3$ x $10-7$

$($C$0\mathrm{.}1)$

where E is the hydrocarbon emission rate for a valve and C is the screening concentration

valve of that valve in ppm$.$ There are $352$ operating days per year. How do the results vary

when different estimation methods are used.

Table: Valve counts, mVOC, mA$,$ and screening concentrations for unit

Stream

No

Type of

Service

No$.$ of

Valves

Mass fraction of VOC

in fluid serviced by

valve $($mVOC$)$

Mass fraction of A in

VOC portion of fluid

serviced by valve

$($mA$)$

Screening

value

ppm $$

$1$ Gas $10\mathrm{.}950\mathrm{.}6130$

$2$ LLa

$10\mathrm{.}950\mathrm{.}611,000$

$3$ LL $10\mathrm{.}950\mathrm{.}6500$

$4$ LL $10\mathrm{.}990\mathrm{.}910$

$5$ LL $10\mathrm{.}990\mathrm{.}95$

$6$ LL $21\mathrm{.}000\mathrm{.}9990$

$7$ LL $20\mathrm{.}9990\mathrm{.}990$

$8$ LL $40\mathrm{.}990\mathrm{.}90$

aLight liquid