Bob Darrah wrote:

Paul,

Mayby I am not understanding your test system right, but if the pipe that
goes out the top is basicly a "stand pipe", it looks to me as if you are
restricting the intake, not the     output of the pump

By putting the "stand pipe" in the lower tube, it would flod the intake and
the valve would restrict the output.

So you had trouble with those circuit breakers, too.

FWIW

Bob Darrah

In theory in a sealed closed loop water system water speeds up when it goes
through a restrictor and slow down when it encounters a larger
pipe. Total volume of flow is the same. In theory the inlet is always
flooded. Liquid is not compressible. This differs greatly from a gas.
With a gas volume goes  down while pressure goes up. It can be argued that coolant
is a combination of liquid and gas. The gas is dissolved and is released
when the coolant is heated I suspect. I could be wrong about that.
I think Bill can fill (sorry, no pun intended.) us in on this.

The stand pipe is capped and sealed so I can pressurize the system.
If it were not sealed it is only about a foot high so the resulting pressure
on the outlet and on the entire rest of the system would only be about .45 psi.

Re: circuit breakers. We all agree. Pumping water takes HP!!!

Paul Lamar

"In theory" and as I understand your system, ANY airspace, capped or not in
your stand pipe on the pressure side of the valve will distort the
performance.

The standpipe should be on the suction side of the valve, with no air at all
in the pressure side.

Bob Darrah

Why? 


Not that there is much airspace. My guess is its less than one cubic inch.

Paul Lamar
 
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