Whether it's large enough or not depends on what you need to do with it.
If you plan to use it to ship water for the population of Las Vegas from Hoover Dam,
then no, it's not large enough to do the job.
If you're going to use it to sip cold sweet tea from the bottom of a tall frosty glass,
then it's much larger than it needs to be for that job.
It all depends on the intended application.
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Given enough time the entire ocean could be pumped through a half-inch pipe.
The answer depends on the length AND the cross-section of the pipe. Just one of the two measures is not enough.
Three-quarter inch diameter pipe refers to the outside diameter. Different pipe types of the same outside diameter usually have different inside diameters. ASTM SCH 40 pipe of 3/4 inch diameter has an inside diameter of 0.824 inches. ASTM CL 200 pipe of 3/4 inch diameter has an inside diameter of 0.930 inches because of the thinner wall.
With large diameters like that you will most probably need to insert a weld-on 12 inch - 10 inch reducer at the point where the reduction is required. The pipe and reducer perimeter edges should be bevelled, say 45 degrees, for good weld penetration especially if the pipe conveys fluid under pressure.
That will depend on viscosity, which will depend on the substance being pumped.