Comparison of Energy Efficiency: Centrifugal vs. Multistage Sub Pump

Examine their respective curves, and evaluate accordingly. This is well within the range of a suitably selected single-stage pump, but that does not rule out other choices.

40000kg x 9.81ms^-2 x 33m / 24h / 3600sh^-1 = 150W shaft work on a continuous basis, or about £GBP0.5 per day in electricity costs on a per-kWh-metered basis, which is less than the value of a Royal Mail 2nd class postage stamp each day. What were the efficiency concerns again, please?

My tonggue ith getting all shtuck to the shtamps. Thith ith ineffithient.

Holy thit--we thympatithe!

At that sort of size pump efficiency is ~ 50% and motor ~ 75% tops, so with that and pipe friction energy could be 3x higher. Still not a lot in UK but might be big money in OP's part of the world

Moving units to FPS and US dollars, even with your 3X loss I get about $2.50 per 10,000 US gallons of water.

I agree, in several parts of the world $2.50 USD is a lot of money, but 10,000 US gallons is a lot of water no matter where you are. That is approximately the volume of a very large tanker truck (petrol tanker).

Well, there is internet there and a way of accessing it...

Ask some pump suppliers who will know the efficiencies of their equipment, or go on the web and LOOK FOR YOURSELF at the data sheets.

You don't say, but your inclusion of the borewell pump may imply that you are pumping out of a well. If so, this thread should help. Also, if that is the case, does the 100 ft include the lift from the water level to the ground?

Provide more detailed information, and you'll get a better answer. What power source do you have available, etc.?

Unless you have sufficient flow past the motor unit on the "Borewell pump" you will that it will be damaged.

As has been amply demonstrated by Suresh Bakare's post here, he knows nothing about pumps, their application, use or efficiency.

That is why his best (only logical) course of action is to contact some selected pump suppliers and talk directly to them. Before he does this he should have compiled a complete list of conditions, environment and expected results from this pump installation.

Asking total strangers for advice is not a smart way to select a pump.

Suresh Bakare, contact pump suppliers, not anonymous forums.

Others have indicated you know little about the subject and that you need to compare manufacturer information - perhaps a little general guidance might help you.

Multi-stage pumps are generally used for the higher pressures or where there is limited room for the required pump diameter. Your head requirement and presumably space situation does not seem to be a critical issue here.

There is one aspect you've not covered and this is that pumps cannot lift more than about 9 m - air pressure limits how hard they can "suck" and how much they can lift. Beyond around 9 m of lift pump performance or ability to self prime (start water flow) can become a problem. Note that not all pumps are able to self prime.

Bore pumps will be harder to maintain if/when this is required, and I would think they generally cost more. My view is that you would not opt for a bore pump unless you had a lift problem or that you wanted to "hide" the pump.

So, with those points in mind, go back to some suppliers, check out some product literature and hear what the sales people say.

OP is using a submersible pump, so lift/priming is not a problem.

oops, you are right - of course.

Neither. Use a piston-type reciprocating pump. They are hard to find in US.

Easy to find. Just look for a common pressure washer pump.

No, not that easy. Ask a pump supplier

40,000 liters = 10,500 gallons.

That's way more than a Cat pump puts out. It'd take a Cat pump 145 days to pump that much water. Ask a pump supplier

Suresh Bakare, don't ask strangers, ask a pump supplier. Do you expect to get the pump from a forum member? Ask a pump supplier.

Which model of Cat pump are you referring too? http://www.catpumps.com

My pressure washer puts out just over 3 GPM freeflow so given a 24 hour run time that works out about (3 x 60 x 24) = 4320 or roughly 2.4 days to move 10,500 gallons.

Now that said piston type pumps come in all sizes. The FMC Q40xx units we have at work for fracking oil formations can put out up to about 1250 GPM and can go up to 15,000 PSI at lower flow rates! (2500 engine HP limit.) FMC Plunger pumps.

Personally the OP has given us near zero info to work with relating to the whats and why's of the situation but given his concern for energy efficiency Vs running cost I have suspicions that he probably cant afford to buy and run anything much more than a hand operated pump jack system driven by local labor.

I know, I know. My point was these pumps aren't high capacity.

OP has near zero knowledge of the subject.

That's okay. I have lots of free time and I like blend my snarkiness with a bit of educational info.

GPM, not GPH. Only off by a factor or 60.

Never mind.

You're not my boss are you?

At work he and I seem to have a lot of these discussions about how I am wrong that seem to continually end with well, um...... Not so much on my part being the end answer.

I should never do math in my head, if it involves more than single digits.

Not so, tcmtech. Try finding a large volume, low pressure positive displacement piston pump in the hydro regime a bit above a propeller pump and a bit below a garden variety closed impeller, highest efficiency centrifugal. Such a pump went out with cheap electricity and International Harvester. If you know of a good source that is not one-off engineered (stock pumps), let the world know.