Quote:
Originally Posted by RADustin
...The airdog lift pump I'm using is 100GPH or about the 16 gallon tank contents every 9.5+minutes. It's not anything crazy. The 3/8" return will flow at most ~4.8 ft/s(about 3mph)...
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The rule of thumb that I've heard most often for maximum design flow rate in a pipe is 5 ft/sec. This was assuming water, but light fuels are similar enough. That's merely a rule of thumb. I'm sure it can be surpassed easily, but 5 ft/sec would give you minimal pressure drop, no erosion of pipe surfaces from turbulent flow, and would make efficient use of the pump.