For an inside process area $(30,000f{t}^3)$ and the temperature is $80F$ :

a$.$ Determine the recommended ventilation rate that will handle Class I liquids and gases.

b$.$ Determine the concentration of propane in the area as function of time if at $t=0,$ a $3/4-$

in propane line breaks $($the propane main header is at $100g).$

c$.$ describe what safety features should be added to this process area.