Question

A 100-m long horizontal pipe carries water at an average velocity of 2.5 m/s. The required pressure drop, deltaP, across the length of the pipe required to achieve this is 1.5 x 10^5Pa, and the surface roughness to diameter ratio of the inside of the pipe is k/D= 0.004. What is the diameter of the pipe?

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The mean velocity of water in a 150 mm horizontal pipe is 0.9
m/s. Calculate the loss of head through an abrupt contraction to 50
mm diameter. If the pressure in the 150 mm pipe is 345 kPa, what is
the pressure in the 50 mm pipe, neglecting pipe friction?

2 parts! thanks :)
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