pipe friction

Question 1

objective

Answer 1

study pressure drop in pipes caused by shear stress for different pipe diameters and pipe materials

pressure drops analyzed as a function of pipe length and flowrate in order to calculate pipe friction coefficient and absolute roughness

Question 2

equipment

Answer 2

water loop

water tank and pump supply water to pipe test rack

pipes 10ft long with pressure taps every two feet. measure pressure drop over 2, 4, 6, 8, 10ft

Question 3

pipes

Answer 3

nominal 3/4” and 1” steel pipes and nominal 3/4” pvc pipes

Question 4

procedure

Answer 4

open ball valves on each test pipe

ensure ball valve on return line set to correct position

slightly open flow control valve and then turn on pumps

open flow control valve until one of diff pressure gauges reach max or valve fully opened

read diff pressure gaugaes for pressure drop for each gauge

repeat prior steps for 80, 60, 40, 20% of max flow

close flow control valve, turn off pumps

Question 5

conserve of energy

Answer 5

(pressure diff) / specific weight of fluid = darcy friction factor * (length/diameter) * (velocity squared / 2*gravity)