(I TRYING TO RESOLVE PROBLEMS, AND I WAS ABLE TO RESOLVE SOME, THANKS TO YOU AND OTHERS, AND MY SELF TOO..I DON´T WANT TO MAKE MYSTAKES..BY DO WAY: WHAT MYSTAKES DO YOU THINK I AM DOING, OR PLAN TO DO?Either you are not understanding or don't want to, but your numbers do not add up.
Your motor and pump can not make 30 GPM at 3000 psi. That volume and pressure would require about 58.3 HP. (I KNOW THAT SINCE...)
If you used the 4000 psi number to compute HP, it would take about 77.8 HP. (SURPLUSCENTER AGAIN? OK....)
To get 30 GPM at 1470 motor rpm, you need a pump with a displacement of 4.71 cu in. You could spread the displacement across multiple pumps, but the rpm will be the same. (i HAVE TWO PUMPS COMBINED WITH exactly 4,71 cu in, don´t understand what you mean with spreadind displacements and same rpm's..)
You still need 58 HP or 77 HP depending on pressure. (DON´T TELL ME...THAT WAS YOU THAT TEACH ME THAT..NOW I KNOW IT JJ)
If you want 30 GPM using your electric motor, then you have to limit the pressure to 1300 psi using 25 HP. (WHAT AM I SAYING FOR DAYS?)
You should also know that any pressure developed is dictated by the load, and the HP requirements will vary through the psi range.
Go to the calculators page on Surplus and plug in the numbers and you might see what we are trying to tell you. (WHAT ARE YOU TRYING TO TELL ME? I´m more and more confused...)
Maybe I should quit trying to help and let you make all the mistakes you want to.
JJ, do you know how yours 2 stage pumps work? well, my twin pumps work exactly the same, the only diference is that they are working with a "proper block valve" with a solenoid that do what 2 stage pumps usually do..they automatic switch one FLOW to another when the pressure in the systems varies..in my case, they switch 30 GPM combined to 12,5 GPM of one pump)..so, again, I have 30 GPM combined by two pumps at once (with my HP limits i only can run those 30 GPM@1200 PSI) and when pressure rises I have 12,5 GPM@3000 PSI, because I only have 25 HP in power source)..I do not plane to run 30 GPM@3000 PSI..are we talking for days about the same, don´t you think?
I have the following pump displacements: 2,69 + 2,01 + 1,45 + 0,98 cu in
total displacement in system: 7,13 cu in ( i do not plan to run all this displacement at the same time, obviously)
total displacement for twin splitter pumps: 4,71 cu in (exactly wath you said i need, is what i really have )