1. An orifice gauge is to be installed in a 12" ductile iron pipe that conducts water at 60 F. A mercury manometer shall be used to measure the pressure difference across the orifice when the expected range of flow rates is 1500 gal/min to 4000 gal/min. The scale of the gauge ranges from 0 to 12 in of mercury. Determine the appropriate orifice diameter.

2. A Venturi gauge is connected to a 4 in Schedule 40 steel pipe and has a throat diameter of 1.5 in. Determine the pressure difference measured across the gauge for a flow rate of 600 gal/min of kerosene at 77 F.