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WC pumps...

W

Winter_Ocelot

n00b
Joined
Nov 18, 2003
Messages
9
I've seen a couple of threads about water pumps recently, but I haven't seen any info on this: How do submersible pumps compare to inline? I'm looking at getting a submersible Supreme Mag 3 (Danner Mag 3), but is there are reason to avoid this in favor of inline? Also, are there better submersible pumps? I'm looking for something quite small, so if you guys have any thoughts, please post!
 
Just realized I put this in the wrong forum! Could somebody move it to the Overclocking & Cooling forums?
 
moved :D

and the reason i personally chose an inline vs a subersible is becuase with a sub pump you actually need like some container with a lot of water for it to sit in... an inline you can have a much smaller res, or none at all if you do a closed loop system
 
the mag drive pump your looking at is a really good pump. BUT, it will definitly leak around the impellar housing. i got the magdrive 5, 500GPH pump in my setup and it is excellant! what i did to seal the pump was remove the impellar housing from the front of the pump. run a bead of silicone sealant around the bottom of the housing that you removed and then push it back on and let the silicone sealant squeez out from between the housing and the pump body. then just run a nice clean, medium thickness bead of silicone around the housing and it wont leak a drop! they are super quiet and very reliable too once you seal em. best thing about em is they are inline as well as submersable. so you can have at it any way you like. i chose inline.

C
 
The disadvantage of submersible pumps is that all there heat ends up in the water so your system runs 0.1C hotter. :mad:

The advantage of submersible pumps is that the pump intake is much less obstructed so you get better flow rates causeing your system to run 0.1C cooler...:eek:

The main advantage of inline over submersible is less space in needed.

Luck......:D
 
Petrolium jelly around the O-ring also stops leaks. My mag 3 has been in my system for 6 months without a single problem.
 
I'm a water cooling n00b, so correct me if I'm wrong. If you had a decent radiator and it was right after the pump in your system, wouldn't it take care of the extra heat from the pump? And wouldn't a submerged pump run cooler, and therefore last longer?

Bah! What's all this inline trash y'all been feeding me!:D j/k
 
CaNNoN, thanks for the review of the mag pump. If I did submerge the pump, would I need to bother sealing it like you did? That is to say, since I obviously won't need to worry about water dripping, do I still need to worry about leaks because it will lead to lower flows and pressures? Or is it not that serious?
 
if you submerge it, then the leaks don't really matter.. :D
(unless they're giant holes of course!)
 
The flow rates of a pump will not really be any different in a submersable pump than they would be in an inline configuration. I did some simple experiments with my watercooling loop before I installed it. With the pump submerdged, the water after 6 hours of running was 90*F with an ambient temp of 79*F. With the pump running external of the water source (a 10 gallon aquarium filled half way) after 6 hours at the same ambient temp, the water measured 80*C. If you have an external pump, go right now and put your hand on it. I guarantee, it will be nice and toasty warm and depending on the pump, may be almost too hot to hold your hand on. I have heatsinks mounted to mine. :)
 
your welcome!

as for your questions.

if you submerse the pump, leaks will no longer be a problem, unless as stated above, they are VERY bad leaks. if you have serious leaks from the impellar housing, it will decrease your pumps preassure thereby decreasing its flow rate, or the amount it is able to pump. all in all you want a sealed pump. that will always help your pump perform to its fullest potential.

also, a thing to note about submersable pumps, and submersing them. there are a few advantages of this methid, and really no disadvantages i can think of, other than a big tub of water being close to your rig!

advantages of submersing the pump are

1: quanity of liquid. the more liquid you have, the less heat energy will build up in the liquid, therefore the pump will not be passing warmed liquid through your waterblock thereby decreasing your temp. the same is true with a RES as long as the RES is of proper size and hold plenty of fluid. i built my own RES out of 2" PVC. its dimentions are 2" round x 12" tall. it hold plenty of fluid, and my temps never rise above 36c at full load. on a P4 2.4c @ 3.6ghz. 1.54V also, the heat energy from the pump will also be delivered to a much larger amount of liquid, decreasing the overal temp of the water passing through your block.

2: you will be able to get your pump pumping at its full capability suction wise. it will have no restriction at all and will be free flowing.

i also recomend not using glycol based coolants aka "anti freeze"
its heat dissipation is 15% lower than a water+water wetter mix of 50/50. your fluid will disperse heat much better with the 50/50 water wetter fix. i have tested this and proved it to be true. <in my system>

hope this helps ya!

if you want my reccomendation for equipment, just ask :)
 
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