Here is a picture of the test set up. It is a closed loop system
with a ball valve using 1-1/2 ID pipe through out.

Well as I suspected there are some significant differences in the
closed loop system compared to the open loop system.
Kind of blew me away when I saw 40 GPM on the flow
meter with a wide open valve at only 2000 pump RPM.
With the valve partial closed (fully closed is 90 degrees)
the flows are as follows.

25 GPM  and 15 GPM at 2000 pump RPM's see the pictures below.
The flow is a very sensitive function of the total restriction
in the system. At low RPM's small increases in restriction will
generate rapid losses in total flow. Pressure increases are
minimal. The highest pressure I have seen on the outlet of
the pump so far is about 3 psi.

At 4200 pump RPM wide open it pegged the flow meter at well over 75 GPM.

I adjusted the valve partially closed for 75 GPM at 4200 pump RPM and the 30
amp 110 volt circuit breaker blew in about 30 seconds.

I need to borrow a more powerful mill. No doubt about it these pumps
suck the HP. The pump get quite warm on only a few seconds of running.

Paul Lamar

Here are some more pictures. I turned off all lights and used a flashlight
for the optical tach.

Paul Lamar
 
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