Water flows at a rate of 9.9 gal per minute in a new horizontal 0.75-in.-diameter riveted steel pipe.
Frictional pressure drop depends on velocity, diameter, viscosity, and roughness. Use the average value of a parameter for a range if no further information is given.
What is the relative roughness?
What is the Reynolds number?
What is the friction factor?
What is the pressure gradient (pressure drop in psi per foot of length)?