For an inside process area $(30,000$ ft$3)$ and the temperature is $80\backslash$deg F:

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

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

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

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