Isn’t this kind of the same thing as saying the pump creates the pressure?
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It’s not the same thing. If you have to fix, troubleshoot, adjust, maintain, design, the pump.
What makes the pump a pump is that it pumps, moves, displaces, the fluid. As long as this movement is performed the pump is doing the job.
It’s not true for pressure, there are several reasons for a pump to fail to provide pressure or to be unsatisfactory in pressure, but none of this make the pump stopping being a pump.
Example axial compressor: does air come out of it? Yes? It’s working. If the pressure is low there may be inefficiency, the system to which it is connected is malfunctioning, etc. But the compressor is truly dead only if it stops, or it stalls. Both cases, dead flow dead pump.
Centrifugal compressor or pump: same, no flow no pumping. As long as there is flow, the output will have a greater pressure than the inlet. It’s dead only if it stall or stop. And again, stall is a fancy name to say the flow has stopped.
Piston or gear pump: again, what does kill the pump? Stop its movement, or lock the outlet (which will stop the pump or break it). Both cases it would not pump anymore. All the other problems will affect the pressure but not kill the pump.
Seems trivial, but really, if you get this you get what pumps should do all time and how to keep ‘em working properly. You preserve the flow, in any way needed, you preserve the pump’s scope.
And if you know that a pump makes flow not pressure, your can make it really efficient in design, as you know exactly what the pump does and what it needs to be a good pump.
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