Pump Sizing 1

[rotaryguy]

hi guys,

i am in need of help. i have two set of condition.

1 Rated capacity=545 gpm, and diff head=165 ft

2 Rated capacity=80 gpm, and diff head=180 ft

is it possible to design API 610 pump which works on both condition!

thank you

 

[BigInch]

It is possible to get one pump (although not with different rated heads) to run at both flowrates, but not for long as you would undoubtedly experience heavy maintenance costs, and the running expense/gallon lifted would be tremendous due to the wasted energy at the low flowrate. You're going to be happier all around with two pumps. The wasted energy alone will probably pay for the second pump in short time.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[rotaryguy]

you r right biginch. because of vibration it will lead to bearing failures and in turn high maintance costs. thanks dude,

rotoryguy

 

[BigInch]

Don't forget ... high unbalanced forces on the impeller with excessive axial thrust and possibly elevated temperatures. Just not a good idea all around. If you try a bypass, still high energy consumption at the low flowrate makes it very uneconomical.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[stanier]

A positive displacement pump with a variable speed drive may be capable of meeting the range of duties.

Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng

http://www.waterhammer.bigblog.com.au

 

[BigInch]

Stanier, you're right. I may be wrong, but I think someone with a name like "rotorguy" might prefer centrifugals. If I recall correctly he drills water wells. Admittedly, I assumed he was looking at centrifugals only.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com

 

[rotaryguy]

buddy i am rotaryguy with handle drilling black water(oil) need of centrifugal pump only.thanks big" and stanier.

 

[Artisi]

If a well driller - why API610.
Anyway, BigInch is dead right, 545 to 80 gpm at similar head rating is far too much turn-down for a centrifugal pump to operate trouble free.
Although you will find a pump on which you could fit the duties to the H/Q curve - you can then join the ranks of those who are always asking, Why am I having bearing and seal failures, why am I breaking shafts etc?

Use 2 pumps, save power and all the headaches.


Naresuan University
Phitsanulok
Thailand

 

[MortenA]

Rotary

Maybe you should consider a progressive cavity pump with a VFD?

These pumps are also very tolerant to particles.

Check these guys out:

http://www.seepex.com/cps/rde/xchg/...plication_oil_gas_petrochemical_industry.html

Best regards

Morten