Head Loss in Pipe - Roughness, Velocity, Length

[topsey2]

Water flows through a horizontal 150 mm diameter pipe with a mean velocity of 2.5m/s. The surface roughness of the pipe is 0.15mm. Determine the head loss in a 30m length of the pipe. Hints, use moody chart, Re = ρVD/μ.

Been having trouble with the question, can't seem to do it.

 

[marvincwl]

use Darcy weisbach eq

http://en.wikipedia.org/wiki/Darcy–Weisbach_equation

calculate the reynolds no. and find out the friction factor using the moody diagram, unless u can assume whether its laminar/turbulent/ if friction factor is already given