Heating Helper

CHAPTER 2 - HOT WATER PIPING - RESIDENTIALPipe Capacity in MBHat 500 Milinches Restriction Per Foot of PipeVelocity Flow of WaterPipe Size(inches)MBH+ FrictionHead Feetper 100'GPM at20° T.D.InchesperSectionFeet perMin.1/23/411-1/41-1/222-1/234173971160240450750140029004.2’4.2’4.2’4.2’4.2’4.2’4.2’4.2’4.2’1.73.97.116.024.045.075.0140.0290.023273440*45*54*62*72*80115135170200225270310360400* - Maximum velocity flow+ - In order for a pump to move the G.P.M. listed, the pump must overcomea friction head of 4.2 feet per 100' of pipe travers.(Total Equivalent Length)Example:If one wants to carry 16 gpm in a 1-¼" pipe through a pipe circuit of300' (T.E.L.), the pump must overcome a friction head of 4.2' x 3 or12.6 ft. In other words, the pump specification would be to pump 16gpm against a 12.6 friction head.38