Need more pump speed 4

[prmmel]

I have a Centrifugal pump that peaks at 70psig @ 60Hz. The pump is doing no work at 70psig as the flow is almost zero. I need to increase the pump speed to get about 80psig. I think that going to about 70Hz or 4000RPM will give me the impellor tip speed needed to generate additional pressure at a low flow condition. The pump is on a drive, so speeding it up is not a problem. If anyone cares to chime in, advise would be appreciated. We will consult with the pump mfg (Myers) but I am sure they will conservatively say 60Hz max to stay in warranty. I am trying to figure out what the real effects of going 4000+RPM. The motor is a high end Al metric motor frame that I actually have made overseas and imported in..much higher quality bearings that most US NEMA motors.

The reasoning for the above is I really need the ~80psig. currently i have the pump on PID drive control from a 0-100 psig transmitter that is set at 75psig. pump only does 70, so it runs at max speed but is limited to 60hz by drive default.....ultimately this will just boil water in the pump. If I can set the drive to attain the 75psig and max speeed goes from 60Hz to 70Hz, then the pump will reach 75 and shut off in sleep mode.

Advise here is great!!!


All advise is appreciated.

 

[wimple]

All & Scotty

Thanks for the explanation
Very clear !

Rgds
Wimple

 

[ScottyUK]

Hey Bill, we've managed to fool BigInch into thinking we know what we're talking about.

Just as well the proper electrical engineers don't venture down here into the land of pipes and pumps or we'd be in BIG trouble!


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If we learn from our mistakes I'm getting a great education!

 

[Artisi]

I'll bet the OP is now so confused he doesn't know there to start in typing a reply %-(

 

[Unotec]

I hope the OP is repented of his ways and learned not to speak back to his elders (5 feb reply to Biginch).
But I am sure that if he followed this posts he would be as enlighted as I am now.... well... somewhat enlightened... not really, but I did learn a lot.

<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying ” Damn that was fun!” - Unknown>>

 

[BigInch]

Nobody fooled me! (Not even the OP.)
I know ya'll pretty well by now that I was sure I wasn't getting a run-around, but I checked it out anyway!



**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[rbulsara]

Scotty, Big Inch:

Good discussion..for my learning too.

 

[Artisi]

Agreed, a good discussion although I don't think we have solved the intial problem - but why worry about such a small point as the OP has vanished anyway.

 

[BigInch]

Which problem do you mean?

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/