Question

1). A large tank is partly filled with water, the air space above being under pressure. A 2” hose connected to the tank discharges on the roof of a building 50 ft above the level in the tank. The friction loss (head) is 18 ft. What air pressure must be maintained in the tank to deliver 0.436 cfs on the roof? Ans. 32.1 psi.

2). If the tank in Q1 is open to the atmosphere, what mechanical power must be provided by a pump to achieve the same outcome?

Answer 1