Ethylene gas leaves a compressor at a pressure of $3500 \mathrm{psig}$ and is carried in a $2 \mathrm{in}$. sch 40 pipeline, $100 \mathrm{ft}$ long, to a unit where the pressure is $500 \mathrm{psig}$. The line contains two plug valves, one swing check valve, and eight flanged elbows. If the temperature is $100^{\circ} \mathrm{F}$, what is the flow rate (in scfm)?