Ethylene ( $\mathrm{MW}=28)$ is transported from a storage tank, at $250 \mathrm{psig}$ and $70^{\circ} \mathrm{F}$, to a compressor station where the suction pressure is $100 \mathrm{psig}$. The transfer line is $1 \mathrm{in}$. $\mathrm{sch} 80,500 \mathrm{ft}$ long, and contains two ball valves and eight threaded elbows. An orifice meter with a diameter of $0.75 \mathrm{in}$. is installed near the entrance to the pipeline.

(a) What is the flow rate of the ethylene through the pipeline, in scfh?

(b) If the pipeline breaks at a point $200 \mathrm{ft}$ from the storage tank and there are four elbows and one gate valve in the line between the tank and the break, what is the flow rate of the ethylene (in scfh)?

(c) What is the differential pressure across the orifice for both cases (a) and (b), in inches of water?