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flow rate through different diameter pipes - as in return to boiler
I've found some formulas on line for determining flow rate through pipes - sort of complicated by friction and other factors but I would just like a ballpark assess from experienced people . What I am curious about is how much longer condensate returning after the boiler turns off would take to get back into the boiler with different length and diameter of pipe after it drops down to ground level. For instance if you went from travelling through 2 feet of 2" diameter pipe to 5 feet of 1" diameter pipe would that change the time for all the water to get back into the boiled appreciably? Like a few minutes? The boiler is supposed to hold 12.7 gallons of water- though not that much would have traveled out into the system as steam and returned as condensate of course. Thanks for your insights.