4. The system shown below is a closed tank filled with methanol at 20° C. The headspace of the tank is pressurized with

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4 The System Shown Below Is A Closed Tank Filled With Methanol At 20 C The Headspace Of The Tank Is Pressurized With 1 (60.96 KiB) Viewed 22 times

4. The system shown below is a closed tank filled with methanol at 20° C. The headspace of the tank is pressurized with air at 12 psig. A drain pipe at the bottom of the tank has a valve that is currently closed (no liquid flow). Air P=12psig 7 ft 4 ft Open to Air a) Calculate the pressure at the valve in psig when the valve is closed and no methanol is flowing (static problem). (5 pts) b) Now assume we open the valve and allow the methanol to flow out. What is the volumetric flow rate (in ft³/s) out of the tank if the exit pipe has a diameter of 1 inch? Assume negligible frictional losses at the pipe and valve. (5 pts) c) What would be the exit velocity when the tank is half-drained at 3.5 ft of head? Consider the pressure in the tank has now decreased as the air expanded. (5 pts)