You must install an orifice meter in a pipeline to measure the flow rate of $35.6^{\circ} \mathrm{API}$ crude oil at $80^{\circ} \mathrm{F}$. The pipeline diameter is $18 \mathrm{in}$. sch 40 , and the maximum expected flow rate is $300 \mathrm{gpm}$. If the pressure drop across the orifice is limited to $30 \mathrm{in} . \mathrm{H}_{2} \mathrm{O}$ or less, what size orifice should be installed? What is the maximum permanent pressure loss that would be expected through this orifice in psi?