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How do I owe RMS an apology?
as to my use of the world is, I humbly appologize as I could not and do not know for 100% that the suction of the pump is cuasing the collapse of the tubing.
I'd also like to note that Wasser hasnt returned with any feedback on our suggestions, so none of us know who is indeed actually correct.
To quote RMS
"(edit) This is all assuming you are using the same ID tubing as the stock barbs on the pump and that you are not using extremely thin walled tubing."
Notice that the pdf that you linked to suggests using hose the 'same size as the inlet and outlet', so you completely shot yourself in the foot, by ripping the :banana::banana::banana::banana: out of him, then proving his point... Seems like you have a personal beef more than anything.
My Iwaki sucked tubing flat when I tested it in a open system (sucking water out of a sink. However, when I put it in a closed loop, the pressure from the pump was enough to push the tubing round near the pump inlet.
There may be a difference in pressure between the pump outlet and inlet, but I don't think that in a closed, small loop that differential is enough to suck a tube flat.
Depends entirely on your tubing... how flexible and elastic it is, and how thick its walls are.Quote:
Originally Posted by Mr. Tinker
Tinker the dp between the inlet and outlet in a closed loop will be the same (for the most part anyway) as in your sink so long as the flowrates are the same.
The diference is the negative pressure on the pump intake will be lower in a closed loop.
I concur.Quote:
Originally Posted by Etacovda
Honestly, looks like your tubing is just badly positioned and twisted.