Which of the following is the approximate head loss in a 1,500-foot long section of 6-inch diameter galvanized iron pipe conveying water at with a velocity of 5 feet/second? (Assume friction factor of 0.02)
Explanation
Answer: B - The approximate head loss in a 1,500-foot long section of 6-inch diameter galvanized iron pipe conveying water at a velocity of 5 feet per second is 23.3 feet.
Solution: Use the Darcy-Weisbach equation
HL = f (L/D)(V2/2g)
Given,
f = Darcy friction factor = 0.02
D = 0.5 feet
L = 1,500 feet
V = 5 feet/ second
g = 32.2 feet2/second
Therefore,
HL = f (L/D)(V2/2g)
= 0.02 (1,500 / 0.5) (52/2(32.2))
= 23.3 feet
