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running 2 pumps

S

Stugots

Supreme [H]ardness
Joined
Feb 25, 2004
Messages
7,301
im getting one of those server cube style cases from work for free and i want to move my server into and try to watercool it. the case is divided into 2 sections, the left side for the motherboard, and the right side has 2 hdd racks for a raid array. im going to gut the right side of it and use it for the watercooling components.

i was planning on using 12v waterpumps but i hear they dont have that great of flow rate so i was thinking about running 2 of them. im not sure if ill be able to use 1 radiator or 2. im going to need a very large radiator ( close to 6x14 ) to fill the spot where the raid drives were, if i cant find one that big ill just use 2 smaller radiators in series. its going to be a 1/2' system. this is what i want the system to look like...

1 rad setup
res -> pump -> rad -> pump -> cpu -> res

2 rad setup
res -> pump -> rad -> rad -> pump -> cpu -> res

the computer this is cooling isnt much, its only a celeron 1.3 (system in sig). but this is my first DIY water cooling system so i just want something to mess around with and possible move my main system over to it if it performs better than my koolance. what are your thoughs on running 2 pumps?
 
if you get a swifty 650 you only need 1 especially if you're only cooling the cpu.. and you only need 1 rad if your just cooling a celeron
 
If you get two pumps going I think that you would be prone to a better chance of leakage, and I know that you don't want that. I'm guessing that cause flow pressure would be greater. Bro your hardware lots of money, I would hate to hear about you loosing it or something( not against WC) but yea bro just be careful.
 
I would say 2 pumps on the same line is bad. Here is why. When you pump something, you are creating a pressure drop on one side, and an increase on the other side, and it isnt exactly constant. If you have 2 pumps running on one line, instead of one pump controling the pressure of your lines, you have 2 pumps varying the pressure. Which would be fine IF it werent a closed circuit. For example, that would work fine in your shower. But you are feeding from one pump into the other continuously. You could have a bunch of different problems with the pressure on the tubes, with backpressure and such. It has been a while since I have done pump design, but 2 pumps on a WC rig on the same, closed line, sends off a bell in my head as bad.
 
well my idea to use 2 pumps came from my koolance system. the koolance system use 2 very VERY weak pumps inside the res. i figured with a larger system, with more water, using 2 of these not so powerful pumps would be the same as using the 2 weak pumps in my koolance.
 
The DD D4 is an excellent pump and you wouldnt need 2 for that setup.
 
I use two hydor L35's on the same line, the only thing that connects them is a dual bay res i picked up. I use one chevette heater core and one bonne, the first part of the loop feed into my cpu-chipset-aqua computer res(small but very nice looking) then into my dual bay. Second loop goes into the chevette core then to my 6800 back to res. Used to load out around 55c(6800) when everything was on the same loop. Now 50 51c is the highest ive seen it go. Not a big performane gap but it looks cool and some guys buying it next week, thinking he needs it to play games :rolleyes: wonder who gave him that idea
 
i think its going to be safer ( and cheaper ) for me just to run a single pump.
 
im going to order me a pair of those pumps. Look under their product reviews and you can get some killer info on running these.

2 in line = higher pressure

2 that tie into eachother = higher volume

I emailed them yesterday to see when they will be available, well see what they say. soon I hope.
 
ronenvelarde said:
I emailed them yesterday to see when they will be available, well see what they say. soon I hope.
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D-Tek is the only US seller but for some reason they still have that damn "pre-order" thing for quite some time now, the only other place I know have them are North of the border: http://www.bigfootcomputers.com/Mer...en=PROD&Product_Code=6166&Category_Code=510.3

That's were I'm going to have to get mine, price isn't bad something like $7 more (their prices are in CAD so bring a currecy converter).
 
CrimandEvil said:
D-Tek is the only US seller but for some reason they still have that damn "pre-order" thing for quite some time now, the only other place I know have them are North of the border: http://www.bigfootcomputers.com/Mer...en=PROD&Product_Code=6166&Category_Code=510.3

That's were I'm going to have to get mine, price isn't bad something like $7 more (their prices are in CAD so bring a currecy converter).
Click to expand...

I personally own a single CSP750 right now, I'm still waiting for my heatercore to get here from DTek, but the pump kicks ass. I AM going to be running two of thme back to back eventually, as I'm going to add a Maze4 GPU block to the loop for my X800XT-PE, and while these C-Systems pumps are very marvelous and extremely small (only 2" square) they dont do TOO well in multi-block setups. The second block combined with the fact that I might be adding a dual 120mm fan rad later on (to "cope" with the two Pelt's I'll be adding to the loop) is reason enough for me to add the second pump....and yes, it DOES help.

EDIT: Here's a little quote from that systemcooling review of the CSP750:

What I really found interesting was the ability of two CSP750s connected in series to produce over 5 PSI of head pressure. This can be particularly useful when supplying a high performance waterblock incorporating jet impingement or restrictive flow channels requiring above average water pressure. When you place two pumps in series, you are effectively creating a two-stage pump.

Remember: connecting two identical pumps in series will increase the discharge pressure while connecting two pumps in parallel will increase the total system flow rate – pick one or the other, but not both.

And another quick link.

And here's one more thing....a few nice diagrams of different pump/block setups: http://www.systemcooling.com/cs_pump-07.html

Personally, I'm going to be setting my h2O setup like so when I add my NB and GPU blocks, with the pumps in parallel like that and the blocks all in series, as due to the small size of my loop/case I'm going to benefit more from the MUCH higher flow rates of running the pumps in parallel then I will otherwise.
 
I have that Danger Den pump, and I would NOT call it weak in any way. If you don't think it has enough power, you could always overvolt it a bit.
 
About the CSP 750 pumps above. I would head over to Procooling.com to see the concerns listed there in the forums about those pumps. Especially using them in tandem. With lots of input from Cathar and BillA who are both pros in the manufacturing & sales of watercooling gear. Heres the link: http://forums.procooling.com/vbb/showthread.php?goto=lastpage&t=10785

The threads title of "CSP-750 the joint is bad" says a lot of it pretty well.
 
MikeP said:
The threads title of "CSP-750 the joint is bad" says a lot of it pretty well.
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They're talking about using it in a series (which as far as I can tell is discouraged by even the designer of the pump), I'm more interested in performance running in parallel.
 
CrimandEvil said:
They're talking about using it in a series (which as far as I can tell is discouraged by even the designer of the pump), I'm more interested in performance running in parallel.
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Well the loop you showed above had them in series. (series = in a row)

Parallel would split the flow to go to each pump. (parallel = next to eachother)

==>Lazn
 
Lazn_Work said:
Well the loop you showed above had them in series. (series = in a row)

Parallel would split the flow to go to each pump. (parallel = next to eachother)

==>Lazn
Click to expand...
If you bothered to atleast look at the pretty pics in the link you'll see that they cover both Series and Parallel.
 
MONST3R said:
two pumps is accident prone but to each his own.
Click to expand...

You're making yourself sound kind of closed minded by saying that, but I guess I can see where you're coming from. The thing is that yes you have more fittings to deal with, so there's more POTENTIAL for leaks, but anyone who's setting things up right in the first place shouldn't have to worry about those few extra clamps being a problem. With two CSP750's sitting beside each other and turned over so that the inlet barbs are facing up, the tubing coming from the reservoir can simply be split with a Y fitting to go to the two pumps.....and then the two seperate tubes coming out of the pumps are joined with another Y fitting......basically like this.

Going by your school of thought, adding anything to the water cooling loop is accident prone, as the only thing to be concerned about with here is that you get the extra fittings and clamps all secured properly.

I'm not meaning to sound rude or to come down on you at all, but it just sounded like you were putting down the dual pump setup without really explaining your reasoning, and there's WAY to much of that that goes on around these forums already. :rolleyes: ;)
 
Well, I would say if the pumps come paired, as the ones people linked ealier are, then it wouldnt be so bad. What I was talking about earlier was grabbing 2 random pumps, and then having them interspersed along your lines. Say pump>rad>cpu>pump>rez>firstpump. If you have them in unison like that, I would say the possiblity of problems would be minimal (especially when they come paired).
 
swflbatth said:
Well, I would say if the pumps come paired, as the ones people linked ealier are, then it wouldnt be so bad. What I was talking about earlier was grabbing 2 random pumps, and then having them interspersed along your lines. Say pump>rad>cpu>pump>rez>firstpump. If you have them in unison like that, I would say the possiblity of problems would be minimal (especially when they come paired).
Click to expand...

I agree entirely, thx for clearing up what you meant.
 
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