Velocity pumps?

[arcsylver]

Has anyone ever used any of these pumps?

http://www.marinedepot.com/a_pu_csl.asp?CartId=

The specs seem pretty interesting but I am wondering if these would be suitable for a W/C setup sunning 2 pumps.

The 30dB noise level does sound nice though.

[hydrogen18]

the 3rd one would probaly be best for watercooling when using a block like a WW or cascade. the 4th one would be good also. Expect to need to convert all fittings to compression though. Otherwise they look like a good choice. Water heating by them is my only other concern, but a big rad should be able to solve this problem.

[arcsylver]

Well I dont think the pump heat wioll be much of a problem in my planned system. I am currently waiting for final results in a couple of days on a bid for a 1957 Coper Radiator from a 57 chevy to provide the cooling, as well as a small water chiller unit.


I am looking for something quiet enough to put in a server cabinet and use without undue distraction while I am sleeping as the W/C will run 24/7/365.

These a re a little less expensive than the Iwaki pumps is why I was asking. And i like the design and outlet sizes of these.

the t/3 has 3/4" threaded connestions and the T/4 has 1" exactly what I was looking for.

[nikhsub1]

The Velocity pumps have always caught my eye. It looks as if the T1 and T2 are the same motor with different impellers, same goes for the T3 and T4. I am guessing this by the specs and could be wrong. The T1 would be the best choice. Im guessing the pump would consume about 75W, not great but for a big rad should be fine. The 2 extra feet of max head of the T3 are negated by it's 1.26A rating, which should be somewhere around 110W or so. Again, this is all a guess, but I still think the T1 would be the best choice of those 4.

[bigben2k]

Yes.

Hmale uses it: linky! (56K warn!)

He runs his own website now, you can check it out.

[arcsylver]

Well one thing I noticed on the specs of those pumps is they will operate at up to 50 PSI.

And I was looking at the max head ratings of the pumps as well and it does look like the T1 is the best bang for the buck though the GPH isnt as good as the more powerful ones it supposedly can pump a lot further than the T4 in terms of Head.

In my cabinet system I am going to need the maximum head/ft I can get to ensure proper flow through the entire system even if it is at a lower overall GPH


Correct me if I am wrong in my math here but the graph there shows the T1 pump pumping 2.0 gallons per minute at 24 feet of head.

Now 2.0 GPM x 60 minutes = 120 GPH at 24 Feet.


That isnt anything to sneeze at really considering most pumps cant pump that much at the much of a head.

[bigben2k]

To clarify, the 50 psi pressure rating, is for the pump housing, and is not related to the max head of the pump.

(I know that you know that, arcsylver!)

So one could theoretically either pressurize the whole loop, or run a multiple of these pumps in series. Of course no one would do that for a PC cooling loop, as we've already discussed it and the benefits are really too small. Otherwise, the pump stands very well all on its own, and doesn't need any backup. It might be pricey, but it'll have an outstanding reliability.

It's the kind of pump I wish I had!

[arcsylver]

Thanks BB2K for clarifying that I wasn't too clear in my last post about that.


This is going to sound like a total newbie question, But what is the difference between the Md and WMD models of Iwaki pump and why does everyone seem to favor the MD models?

[arcsylver]

Found the manufacturer website for those pumps.


http://www.customsealife.com/waterpumps.htm

Has the specs as well as a nice cutaway of the pumps.

[Quarter]

But what is the difference between the Md and WMD models of Iwaki pump and why does everyone seem to favor the MD models?

The MD has the Japanese motor and the WMD is the American motor.

[arcsylver]

Then why do people spend so much more on the Japanese ones if the performance is supposedly the same according to the specs?


I am just trying to figure it out is all.

Anywho I think I am going to go for 2 of the T1 pumps for my cabinet setup opne pumping water to the comps and one pumping water to the rad.


These things should be more than adequate for my needs and fit the budget nicely for a good high end pump without putting me in the poor house too bad

[bigben2k]

Because the ones with the American-made motor runs hotter.

[arcsylver]

Ah thank you BB2K.

I thought as much but had never found it anywhere.

Well depending on the actual heat output of these pumps they may be a better find then I thought I had found.

But considering my rad setup I dont think a little more heat will be a big deal.

[arcsylver]

I found this over at Overclockers.com by our illustrious Since87. Hass the math needed to explain things regarding the pump heat of AC pumps

quote:
Originally posted by DodgeViper
Remember, AMP X VOLTS = WATTS

1.26 AMP X house current 117 VOLTS =147.42 WATTS

147.42 WATTS of energy added to the water.


This would not be a good buy.


Didn't really pay attention to this the first time I saw it.

Amps X Volts = Watts is only guaranteed to be true for DC systems.

For AC systems where the voltage and current are sine waves the equation is:

Amps X Volts X Cosine(phase angle) = Watts

The current through a pump is usually substantially phase shifted with respect to the voltage, which means that the power consumption will be substantially less than the Amps X Volts.

Also, centrifugal pumps draw less power when their output is restricted than when it is wide open. It's very hard to say how much power this pump would consume in a watercooling setup.

quote:
Originally posted by UnLoadeD

I was looking at the 15rt's but the .82amps kinda scared me off. Do you guys think that would add too much heat to the water?



It's seems odd to me that the MD15 draws .82 Amps when the MD20's only draw 0.5 Amps. I'm not sure what to make of that. I think nikhsub1 said somewhere that the power consumption of the MD15 was only a few Watts higher than an Eheim 1250. I haven't seen the power consumption spec'd though.

My MD20RT (220 Volt version) is spec'd to have a maximum current draw of 0.28 Amps and a max power consumption of 57 Watts. It has a big capacitor inside that probably reduces the phase angle of the current though. I'd guess the MD15 just doesn't have a phase correction cap. (This is not a big deal IMO.)

I did some testing on a Danner Mag5. (Spec'd for 45 Watts power consumption) At 122.6V it drew 0.8 Amps with a power consumption of 35 Watts with a 'low' flow restriction. It drew 0.76 amps with a power consumption of 24.6 Watts with a 'high' restriction.

If you can't find a power consumption spec for the MD15, just ask nikhsub1, but I don't think it's something to be too concerned about though.

[nikhsub1]

Originally posted by arcsylver
[b]If you can't find a power consumption spec for the MD15, just ask nikhsub1, but I don't think it's something to be too concerned about though.

The MD-15R consumes 31W or .38A, says so right on the pump casing.

[arcsylver]

Originally posted by nikhsub1
The MD-15R consumes 31W or .38A, says so right on the pump casing.

ROFL glad I was just quoting him and not saying that myself.

[t00lb0x]

The pumps look good. But pricey, but less than Iwaki but I wonder how they compare.

[murray13]

Nice pump, but specs are NOT as good as a WMD-30RZT Iwaki for the exact same price!!! Customaquatic has the 30RZT for 149.99.

It is a tad smaller. You would figure that considering it is not a mag drive pump. It's a direct drive.

As far as heat goes, ALL inline pump motors will get very warm. The question you should be asking is what is the output of the motor in HP. Then find the best pressure/flowrate ratio to output power. The 30RZT is rated at 1/16HP or about 47W. That's the figure people need to watch as that is how much energy a pump will heat the water (by friction). The 30RZT is also spec'd for 33' head @120gph.

Just some food for thought from a happy Iwaki owner.

[t00lb0x]

But is it as silent as this one?

[Xymurgy]

I'm going to bump this because I'm in the market for a high pressure pump.