Post #9529

FRICTION HEAD (loss in pipe) Hf = 4.73 * (Q^1.85) * L/[(C^1.85)*(D^4.87)] Q in CFS L in feet C is roughness factor - using 130 is a good number D in feet MINOR HEAD (loss in fittings) Hm = K*Q^2/(64*A^2) K is from a table for each fitting. Add them up. Elbows are 0.3 and ball valves are 0.1 as examples. A = surface area in square feet Also account for change in elevation.