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Mixing Pump Models

post #1 of 8
Thread Starter 
With a dual pump top, is there any harm in mixing pump models? E.g.

DDC 3.2
DDC 3.25
MCP350
MCP355
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post #2 of 8
No, and if anyone says otherwise...got proof?

I've tested similar mixed pumps many times and don't see how there could be a problem mixing any of those or even DDC + D5.

Many people jump on a misconception that somehow the impellers need to match speeds, but that's not how centrifugal pumps work. The speed of the impeller simply translates energy into pressure energy and P1 at 4000 RPM could care less if P2 is operating at 4000 or 3000RPM.

About the only thing you would want to avoid is having a system flow rate exceed the max flow rate of the weaker pump. That's pretty hard to do with our highly restrictive systems.
Edited by Martinm210 - 5/19/11 at 10:52pm
    
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post #3 of 8
^ and since the impeller is driven magnetically and it isn't fixed to a motor even if an impeller is being "pushed" by the other in a way that exceeds the ability of the other pump the flow shouldn't harm it since the motor isn't being affected, just the impeller.
 
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post #4 of 8
What would be prefered, having a MCP350 feeding into a MCP355 or the other way around?
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by bmaverick;13633077 
What would be prefered, having a MCP350 feeding into a MCP355 or the other way around?

I dunno why but my gut feeling says slower pumps should be before faster pumps.
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post #6 of 8
Quote:
Originally Posted by elemings;13633828 
I dunno why but my gut feeling says slower pumps should be before faster pumps.

I don't think it'll make a difference...

The flow and pressure is translated all around the whole loop, it equates to the same thing since you feed the pressure back into the pumps anyway.
    
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post #7 of 8
Quote:
Originally Posted by Crabid;13634562 
I don't think it'll make a difference...

The flow and pressure is translated all around the whole loop, it equates to the same thing since you feed the pressure back into the pumps anyway.

Unless the loop dumps into a rather large RES.

My RES is a 1-gallon glass pickle jar. The flow dumps in, but the pump has to draw it out, with some gravity of course. wink.gif

Elemings theory applied to my loop would be ideal.
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post #8 of 8
I don't think it matters unless you were approaching cavitation type problems in which case is might be better to have the weaker or more open pump first where negative pressures are at their greatest.

Each pump adds differential pressure and could really care less about where it's located as long as the pump is primed when filled an the inlet tubes are close enough to the reservoir and stout enough to prevent collapsing from negative pressures.

We have seen a few rare examples where someone ran a really long thin walled pump inlet tube to a pump that started collapsing on them from the negative pressure present there.
    
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