You must size an orifice meter to measure the flow rate of gasoline ( $\mathrm{SG}=0.72)$ in a $10 \mathrm{in}$. ID pipeline at $60^{\circ} \mathrm{F}$. The maximum flow rate expected is $1000 \mathrm{gpm}$, and the maximum pressure differential across the orifice is to be $10 \mathrm{in}$. of water. What size orifice should you use?