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LPM calculation

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LPM calculation Empty LPM calculation

Post  Kethlodi Thu Jun 18, 2009 1:57 pm

Hi all,

I try to calculate the velocity of the output fluid to choose the right pump and got something fun, may it's helpful for who need to calculate the LPM (working LPM), you have to buy much higher LPM pump (or design artillery j/k). Please correct me if anything wrong.
LPM calculation Untitled-2
if the orifice is higher than the ground, you have to measure the maximum horizontal from orifice to intersection of orifice horizontal surface and the water curve. The horizontal velocity (vx) is always weakened and I use about 10% of lossy. Real curves are never perfect paraboloid
Here some equations I can remember from school;
LPM calculation Equations
and an excel table to calculate
http://www.mediafire.com/?sharekey=3396ef68115d5d608c9e7c56ba37815fd1e85925527da39e

Kethlodi
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LPM calculation Empty Re: LPM calculation

Post  liteglow Fri Jun 19, 2009 2:55 am

you loss me after the second line where you did say "calculate" haha ..

Thanx for sharing this, the draw was pretty awesome :-)
But the math is not my best side Embarassed

But for someone that know how to do the math, it must be great knowing this!

For myself, I just do all the configuration in real life test haha..
I did first make a nozzle that was to big, and a pump that was to small for the project.
Solution = rebuild everything and buy a bigger pump Wink

Then tilt my nozzle up\down and adjust the pressure until I have a perfect ARC of clear water flowing with no sound Smile
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Post  Kethlodi Fri Jun 19, 2009 4:29 am

Hi liteglow, thanks for reply
I do know that "try and see" is always better than all prediction and calculation, but knowing the exact flowrate through the orifice is important someway. If you desire to have an xmax and a ymax, may this can help you choose the right pump, and.. just for fun I think

Kethlodi
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Post  Lindenmeyer Fri Jun 19, 2009 5:54 am

hey man, nice work!!
are u sure the third equation is correct?? i thought it was something like Y=Yo+Vyt+1/2gt^2
anyways..!! nive work indeed!!
ill do my project this july if "everything goes wrong" ehehehehe

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Post  Kethlodi Fri Jun 19, 2009 11:31 am

Lindenmeyer wrote:hey man, nice work!!
are u sure the third equation is correct?? i thought it was something like Y=Yo+Vyt+1/2gt^2
anyways..!! nive work indeed!!
ill do my project this july if "everything goes wrong" ehehehehe

Oh sorry, thanks for correcting me. I was wrong in the equation (3) and it make all following ones wrong. Because I choose the Y direction bottom-up and neglect the y0, so the right equation is Y=Vyt - 1/2gt^2. "bugs" are fixed on updated pictures:
LPM calculation Untitled-3
LPM calculation Equations-1

Excel sheet:
http://www.mediafire.com/?cjntvmmzr4h

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