LPM calculation

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LPM calculation

Post  Kethlodi on 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.

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;

and an excel table to calculate
http://www.mediafire.com/?sharekey=3396ef68115d5d608c9e7c56ba37815fd1e85925527da39e

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Re: LPM calculation

Post  liteglow on 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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Re: LPM calculation

Post  Kethlodi on 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

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Re: LPM calculation

Post  Lindenmeyer on 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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Re: LPM calculation

Post  Kethlodi on 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:



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

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