It depends on the pressure.
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0 gallons per minute will flow threw any pipe at 0 psi.
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The flow rate in cubic feet/second is (3*1.5*3) = 14.5 cubic ft/sec. According to Google, there are 6.229 Imperial gallons or 7.481 US gallons in 1 cubic foot. Therefore, the flow rate is 90.32 Imp gallons/sec or 108.47 US gallons/sec. If this many gallons flow per second, then (90.32 x 60) = 5419 Imp gallons flow per 1 minute, or equivalently 6508 US gallons per minute.
That's going to depend on the substance flowing and the pressure behind it. Beer -- more Molasses -- less etc.