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2 pumps = 2x the power?

V

videogamer323

Limp Gawd
Joined
Jan 31, 2003
Messages
384
Was looking at the new swiftech pump with 10feet of head. Wondering if I were to add 2 of these in series on a loop would the add up to 20feet of head. or just a "more garanteed" 10 foot head... My guess is it would end up being around 16foot of head not 2x performance but would help a little.

The reason for this is because I want to build a WCing setup for my Lian Li but I dont want to cut the $220 case. So Im going to build an external unit with probably a mini ATX case that will sit on top of the case.

With this in mind I will need 2 hoses going from the external unit to the tower that are around 30-40inches long. Going with the Swiftech H20-APEX to get me started. Then going to add more like a GPU, possibly 2 more HDD coolers for my raptors. ALso I want to look into either making 1 loop that will cool 2 PCes from this one external unit. So we are talking a lot of hose if i go that way (will probably end up going 2 loops just put them both in the external unit)

Well give me lots of input cause this is my first WCing setup
 
er, no.

go here - http://www.c-systems.ca/

click on user manuals, then the mulit pump users guide. It applies to anyones pump and is the best engineering solutions I have seen. The pros and cons of serveral setups are discussed with nice diagrams.

As they point out, do NOT connect the output of one pump to the input of the second pump, use a tee fitting and a Y fitting as they show.
 
wwparrish said:
er, no.

go here - http://www.c-systems.ca/

click on user manuals, then the mulit pump users guide. It applies to anyones pump and is the best engineering solutions I have seen. The pros and cons of serveral setups are discussed with nice diagrams.

As they point out, do NOT connect the output of one pump to the input of the second pump, use a tee fitting and a Y fitting as they show.
Click to expand...

Actually, no. Their guide applies specifically to the CSP-750 pumps which are the subject of that manual. Because the older CSP-750 pumps used a mechanical seal, if you put them into flow series then the mechanical seal on the second pump would leak and let water into the motor, and this is why they never recommend putting the pumps in series with the CSP-750 pumps.

To answer the OP - yes. Putting two pumps in series will effectively double the peak discharge head of your loop. You will not see double the flow rates though. At theoretical best you will see about +40% flow rates. Centrifugal pumps do push less pressure though as the flow through them is increased, and in practise it generally works out that you'll see a +20-30% boost in flow rates with two pumps of the same kind in series.

Whether it all works best in series or in parallel really depends on the PQ curve of the pumps in question and where you're sitting on that curve. If you're achieving 70%+ of the pump's peak flow rate with a single pump, then putting them in parallel will likely achieve better flow rates than putting them in series. If your current flow rate through your system is less than 70% of what the pump can push when unrestricted, then putting them in series will tend to yield better results than if in parallel.

Again, can quite happily run pumps in series if they are of a sealless design, which almost all pumps are nowadays.
 
So if you put three identical pumps in series would you triple the head pressure? How far does this go before reaching diminishing returns?
 
Basically what the other guy said. Two pumps won't double the output. Its like a speed boat with two motors. If one motor make it go 65 mph, two won't make it go 130 mph. You'll get up to maybe 78. You have a lot more torque though.

I can't really see the advantage of two pumps with this in mind, except if you have multiple blocks, like, cpu, 2 gpus, NB, big rad.....you get the idea. If you did do this, I would you the Y splitter method.

Pump
res----< >--------
Pump

Flow ---->
 
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