Technical > Spud Miller's Cave

pump test bench ? spud

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wideopen231:
 SPud,

 May be a question you had rather not answer,since kind of dipping into your business. If so more than understand. I am working on a fuel pump testing set up. Nothing fancy just a way to keep up with pump.  I have good supply if fluid gauges from my Test and Balance business,been doing air and water flow testing most of my life.

I am thinking a simple setup with motor to spin pump at variable speeds,check pressures and compare to on regular bases. Will be using water since its just a comparative number and not actual flow number. I have some commercial flow measuring devices(circuit setters mostly with dial gauge) and will check flow at set pressure also again just comparative.

Any reason I will be fooling myself on results or suggestions as to how to make a more accurate design.

Spud Miller:
 
 Just checking a pump for comparative flow at a particular pressure isn't a huge deal (not like flowing a complete system).

 The biggest problem you'll have is finding a motor and power source big enough to make the horsepower you need to do it. I burned up MANY motor controllers and motors (literally flames a couple of times). A -1 pump running at 100 PSI will require 2-3 HP at the spindle. A 110 pump @ 100 PSI will need 6-7 HP. To keep the power requirements low, consider checking at a slower RPM (not 4000 pump RPM) and a lower pressure (like 50 PSI, not 100).

 Since flow is going to be directly related to speed, your RPM reading being off just a little will result in inaccurate flow readings. Conquer speed measurement and control up front or it probably isn't worth doing.

 Try to stay away from 240VAC as you'll be working with water and probably standing in a puddle of it most of the time. If a hose blew and shot water everywhere, you could easily be electrocuted.

 Spud

 

wideopen231:
I think I will use my Bridgeport.Has 5 hp motor,up high and don't figure to be standing in water unless tank leaks(plans always work). Thinks for HP requirement tips save buying some useless junk.As for rpm I have cpl strobe tachs guaranteed to +/- 1% that I can use to check spindle speed. Thought about a belt or gear deal to spin pump up using less motor rpm.

 Thinks Spud.

cad500justin:
They make gfi breakers for hot tubs. They’re not cheap, but something to consider if water/electricity isn’t your thing.

Frontenginedragsters:
Spud:
 What liquid do you use for flow testing?

Thanks: Matt

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