Question
The fluid is water at 80C and the atmospheric pressure is 101.8 kPa. The water level in the tank is 2 m below the inlet
The fluid is water at 80C and the atmospheric pressure is 101.8 kPa. The water level in the tank is 2 m below the inlet to the pump. The vertical part of the suction pipe is made of 3 in. schedule 40 steel. The horizontal part of the suction pipe is made of 2 in. schedule 40 steel and is 1.5 m long. The elbow is 90. The reduction is placed after the elbow. The foot valve is of the hinged disc type. The flow is 300 L/min
.
A) The vapor pressure of water at 80 C in [Pa] is
B) What is the average velocity of the water inside the vertical suction pipe in [m/s]?
C) What is the value of Re in the vertical pipe?
D) What is the value of the Darcy friction factor in the vertical pipe?
E) What is the loss factor value Kf due to all fittings in the standpipe (counting the elbow)?
F) What is the value of the friction losses in the vertical pipe in [J/kg] ?
G) What is the average velocity of the water inside the horizontal pipe (after reduction) in [m/s]?
H) What is the value of the Darcy friction factor in the horizontal pipe?
I) What is the value of the loss factor Kf due to the reduction?
J) What is the value of the friction losses in the horizontal pipe in [J/kg] ?
K) What is the value of the friction losses in the entire suction line in [J/kg] ?
L) What is the value of the NPSH (available) in [m] ?
M) What is the recommended minimum NPSH that the provider should be asked to do?
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