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Someone clarifies what if one of two pumps in parallel doesn't work?

post #1 of 19
Thread Starter 
Can someone clarifies if two pumps are in parallel, and one of them is broken/doesn't work/is turned off, what will happen to the loop?

water flow go back to res, or go ahead to waterbolcks?



post #2 of 19
Yeah possibly. Use a hose clamp on the tube coming from the fault pump to include backflow
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post #3 of 19
I think most of th water will go backwards through the non-working pump as it would most likely have the lowest resistance. If you had 2 backflow preventors ( similar to a diode in electronics) then you would be fine.
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post #4 of 19
As others have mentioned, some portion of the water would recirculate back through the non working pump. With as much restriction as your loop has, it would likely be most of the water recirculating.

The more important consideration is why you would run parallel pumps in the first place.

With the number of blocks in your loop, and how restrictive some of them are, you would be much better off with the pumps in series so you have more head pressure available to push the water through all of those blocks.

A side benefit to series pumps is that if one dies, you still have flow through your loop.

Parallel pumps don't give you significantly more available head pressure than a single pump, so in a restrictive loop, they may not actually be giving you much more flow than you would be getting with a single pump.
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post #5 of 19
Why are you going parallel?
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post #6 of 19
Thread Starter 
go parallel can give me more flow rate.
and my loop's bottle neck is too low flow rate.
post #7 of 19
Quote:
Originally Posted by q19890709 View Post
go parallel can give me more flow rate.
and my loop's bottle neck is too low flow rate.
The bottleneck causing your low flow rate is the pressure drop of all of those restrictive blocks you have for motherboard cooling.

Parallel pumps won't give you significantly more flow against a restriction than a single pump because their head pressure doesn't add in a parallel configuration.

You have a very restrictive loop, so you need more available head pressure to force the water through it.
You need SERIES pumps to increase the available head pressure to force more flow through a restrictive loop because their head pressure adds in a series configuration.
Edited by Caleal - 4/25/11 at 12:59pm
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post #8 of 19
^That or dual loops.
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post #9 of 19
Series will give you better flow, as well as become a redundant pump array(in case one of the pumps fail)
post #10 of 19
i agree with the others, a series would do better than parrellel.


try having one pump pulling from the highest point of the loop and one pushing from the lowest.
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