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Water Pump is pulsing?!?

post #1 of 6
Thread Starter 
Hey guys i'm hoping someone with experience of various pumps can help here!

I have a few pumps (maybe 5-7) but due to the restriction of
a) using a run totalling around 5 metres of 6mm ID tube
b) 3 water blocks
c) the extra stresses running at subzero places on the pumps
i decided to pick up yet another pump!

This one is much more beastly than the normal ones found in rigs,it's intended use is for caravans i think.

It's a Shurflo Pump 24v Inline Water Pump
http://www.johnscross.co.uk/products...otorhome-.html
I stumbled across it for £5 at a boot sale and couldnt resist!

Now i have this running from a 12-24vdc @3A max psu and the legend on the motor says 3.5A max current so by rights increasing volts should decrease current draw right?

So when this was hooked up to the loop and sumberged in the res for the first minute or so it pumped a jet of water about 4 foot
That's The One!
Then it begun to pulse,it still shoots a healthy jet but its a second on and a second off...rinse then repeat...

So i am wondering if the PSU isn't up to the job or the thermal overload is kicking in?now i have been using normal HSF on the pc for a while but i would like to hook it back up to the chiller and i am reluctant to do so while its pulsing.

I have another pc psu i could use to drive the pump to test the theory of too little current available but i think 12v is my highest voltage available with a pc psu?
but the psu should be able to drive higher current than my other one which is 3A max?
The other possible solution is possibly the motors thermal cutout is kicking in but the liquid in the res must be around 10-20c so thats not likely is it?

Guys i need your wisdom!
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Lil Cutey
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post #2 of 6
have you tested it's actualy flow while in the loop?
i had a pump that did that when it didn't have pressure (aka. closed loop)
when everything is hooked up it's fine.
the only reason i know this is cuz i have a flow meter in my system and it stays stable while hooked up.
Is it making any sounds while in the loop that indicates it is throttling?
post #3 of 6
Thread Starter 
Sorry yes,it was tested while hooked up.

It's not much good having a jet of water while unloaded as usually the pressure causes the flow to drop,
Hence my shortlived joy at seeing a 4 foot +/- jet after passing through 3 blocks.

I think the only way i could make a closed loop from an open one is to submerge the return tube,though i cant see this helping-i will give it a shot.
Shouldn't the resistance of the blocks/length of tubing create pressure on its own though?
The outlet on the pump is 1/2" ID and it's hooked up to 1/4" ID tube-this should create back pressure on its own i should think.

I should have made that clearer in the OP.
Edited by MightyMission - 7/20/11 at 8:53am
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Lil Cutey
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post #4 of 6
Quote:
Originally Posted by MightyMission View Post
Sorry yes,it was tested while hooked up.

It's not much good having a jet of water while unloaded as usually the pressure causes the flow to drop,
Hence my shortlived joy at seeing a 4 foot +/- jet after passing through 3 blocks.

I think the only way i could make a closed loop from an open one is to submerge the return tube,though i cant see this helping-i will give it a shot.

I should have made that clearer in the OP.
ahh i see, well it still may work to submerge the return. Every system i've ever built i have submerged mine for more than one reason:
keeps consistant preasure, no air bubbles etc..

errr, dumb question, but is there any way you can turn the pump like....upside down while still in the water. just a thought, there could be a bastard of an air bubble caught up in there. Most likely not but it's worth trying if you can do this without trouble.
post #5 of 6
this was happening to my DDC (series with D5)+ "sizzling bacon"..i think this due to low head pressure (i had 90 deg on the inlet)
    
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post #6 of 6
Thread Starter 
OK so i had my dinner then went to solve this,i turned down the psu voltage to 16v from 24v and it stopped pulsing and pumped consistently!
It seems to have about the same amount of force too,so i'm hoping the flowrate isnt too high.
Thanks for trying to help guys + rep to all.
if anyone knows how to close a thread,please let me know
Edited by MightyMission - 7/20/11 at 11:26am
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Lil Cutey
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