Water at 4.4°c is to flow through a horizontal, commercial steel pipe having a length of 305 m at the rate of 150 gal/min. if a head of water of 6.1 m is available to overcome the friction loss f, calculate the pipe diameter.

d = 70.5 mm

Explanation:

given,

length of pipe = 305 m

discharge rate = 150 gal/min

pipe diameter = ?

1 gal/min = 6.30902 ×  10⁻⁵ m³/s

150 gal/min = 150 × 6.30902 ×  10⁻⁵ m³/s

                   = 9.46 × 10⁻³ m³/s

Q = A V

f = 0.048 from moody chart using P/D = 0.00015

d = 70.5 mm

Diameter of the pipe is equal to 70.5 mm

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