Quote:
Originally posted by fhorst
I guess I'd better ho for a better pump, then killing my WW  right?
Can the WW handle the pressure of an iwaki?
And then again....... the jet was made to aid low presure systems. (if I got it correct)
If I would get an Iwaki, it's no longer low pressure. Would the setup gain or lose from removing the jet?
And, where could I get an Iwaki?
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The all-copper White Water that I made should theoretically be able to handle in the vicinity of 300PSI before the O-rings start to "give way".
The White Water nozzle was designed around a 6LPM flow point, being that presented by an Eheim 1250 in a low-moderate-restriction setup.
It is my opinion that a block's "optimal" flow point is a bit like a peak on a very shallow up-side-down parabola. Generally speaking one can either halve or double the design point flow rate and still not really see any significant performance difference from a block of the same design than had been optimised around those higher/lower flow rates. As one moves outside of that range then one could benefit from changing the block's design.
So basically that means that the White Water is going to behave very close to its design optimisation point at anything between 3-12LPM, which represents anything between an Eheim 1046, and an Iwaki MD-30RZ. At flow rates lower than 3LPM, the WW would increasingly benefit from a thicker base-plate as flow rates are dropped lower and lower. At flow rates above 12LPM, the WW would (slightly) benefit from a narrower nozzle plate to boost nozzle velocity. The flow rate would drop off as a result, but nozzle velocity would increase, both sustaining the same impingement region size but with a higher rate of themal transfer.
I experimented with a 25% narrower slot nozzle on the WW with the MD-30RZ pump. With the standard nozzle I saw 12LPM (just above 3GPM) flow rates. With the narrower nozzle the flow rates dropped to just over 10LPM, and I saw no significant performance difference, which for me I term as anything that appears to be statistically less than 0.5C.