Reply To: Pipe size vs. flow rate. vs. pressure drop chart wanted (water)

…ummmmmm, I guess I was just looking for a simple “ballpark” answer. I am replacing 450′ of 3/4″ pipe with either 1.25″ or 1.5″ pipe – I dunno the type – it’s what people here in the US call “black poly” – you can find it at Home Depot, etc… The inner surface finish of all pipes is the same – same material, vendor, etc…

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