An orifice meter with a hole of $1 \mathrm{in}$. diameter is inserted into a $1 \frac{1 / 2}{2}$ in. sch 40 line carrying SAE 10 lube oil at $70^{\circ} \mathrm{F}(S G=0.93)$. A manometer using water as the manometer fluid is used to measure the orifice pressure drop reads $8 \mathrm{in}$. What is the flow rate of the oil in gallons per minute $(\mathrm{gpm})$ ?