In reply to message posted by Harold Hydronic Net:
Ballpark: When going up one size, at the same pressure, the flow doubles. If you go from 3/4 to 1, the flow doubles – to 1-1/4, double again, etc.
Harold sorry, Close but no cigar.
RULE of thumb possibly. reality nope
40 PSI 3/4″ pipe 30.93 GPM
40 PSI 1″ pipe = 55 GPM
40 PSI 11/4 pipe 85 GPM (almost 86)
40 PSI 11/2 pipe 123+ GPM
Granted this is not that critical UNLESS your using flushometers or a fire supression system and figuring you “K” factor for each sprinkler head this could be a major problem.
Contact me on our list and ILL send you all the math involved.
You taught me too well guy…