Quote:
Originally Posted by Vlad
It might be off topic but I will be short. I tried to use 5 HP electric motor for my rig. I only could get 600 psi of pressure @ 18 gpm flow before motor overloaded. I needed at least 1000 psi. I installed 15 HP gas engine. I just have enough 1000 psi @ 18 gpm. I am really surprised 15HP 300% more then 5HP but 1000 psi is only 67% more then 600 psi. Do I miss something? or this is another example how to make money by inflating numbers?  |
It might have something to do with the friction of moving water.
IIRC, air friction (drag) on a car (or airplane) does not double
when you you double your speed, it's the square of the 1/2 speed drag.
(So, if you cut your speed in half, your drag is cut to the square root of your original drag).
I'll bet the same is true of submarine drag (submerged).
Fluids, like water and air, don't seem to react in a linear fashion..
Just my two cents.. I'm old, my mind is going.. So I'm likely wrong..
Cheers,
Rich
Edit:
Found a calculator..
http://irrigation.wsu.edu/Content/Ca...er-Pump-HP.php