That's going to depend on the substance flowing and the pressure behind it.
Beer -- more
Molasses -- less
etc.
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that's what she said
2.5 gallons per minute
0 gallons per minute will flow threw any pipe at 0 psi.
That depends entirely on the viscosity of the liquid in the pipe ! Water would flow faster than oil !
That will depend on viscosity, which will depend on the substance being pumped.