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Pipe Calculator from the Plastic Pipe Institute

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hot_rod
hot_rod Member Posts: 26,449
free download at

http://plasticpipecalculator.com

Lance MacNevin, director of engineering at the PPI had a nice article in Mechanical Business March/ April mag about pipe sizing. They suggest up to 5 fps in plastic and smooth walled pipe.

An example for the 1" pex, wood boiler pipers
Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream
kcopp