Drop Pump Load

Lower the specific gravity of the fluid being pumped.

Dropping the load, "upto 60% without changing the motor, flow rate and head" will be very difficult.

You can't get something for nothing.

Bucket brigade to do the work you want to save on electrical load.

The 70% represents the work the motor is doing. Sort of like asking a race horse to run a race in the same time on half rations.

Change the pumped fluid to one with a specific gravity that is 6/7th of the original fluid. Or find a pump that is better suited to your requirements by the same amount and install it on your existing motor. As noted in previous posts, you can't get something for nothing.

Also note: unless this is just a mental exercise, the motor is likely not running at full efficiency at 70% load. If this is a typical operating parameter, you may find that replacing the motor with a high efficiency unit that is correctly sized will give you the same result- but that's a question for your pump supplier.

Change the pumped fluid to one with a specific gravity that is 6/7th of the original fluid.

Come on, you size the pump for the process, not design the process around the pump.

True, but that's not what was asked!

it was more of a statement than an answer.

As far as looking for a solution to the question from the op, it was a poor one as far as having an understanding of centrifugal pumps. Or actually electric motors for that matter.

Leaves one to speculate the budget is tight.

I think the OP is confused.

"I want to drop this load upto 60%". Reducing the SG by 6/7 will not help them realize their dream.

Very!!

(Actually, I didn't read the OP very well- I saw 60% load instead of reduction in load! But if they change from pumping somethin like mercury to acetone they might pull it off!)

Maybe they do want a 10% reduction in load, but I can't tell by the question.

I see this mentality a lot. Please tell me how to reduce costs/increase efficiency, without putting forth any effort, or money.

What is "70% electrical load"?

Perhaps a different pump selection could operate closer to its best efficiency point (BEP) than the present one. Unfortunately, sufficient details were not given.

70% electrical load is too much.

The OP wants Froggy to plunk his magic twanger and make the electric bill go down.

au.umair,

Do you know what the pump curve for your pump looks like?

I'll stop here, before the devil tempts me to ask the obvious question.

Increase the efficiency of your impeller. A more efficient pump impeller will require less energy to move the same flow and head.

I do not believe you have a viable solution here.

Simple...just magically change the eficiency oif the pump at that specific point of its perfprmance curve. Otherwise slow the pump or start closing the discharge valve. Watch hte amp meter until you get to the desired 60% electrical load.

I'm not being sarcastic, merely silly.

The painful truth of the matter is if using the same pump either the head must be increased or the speed reduced, both of which will reduce the GPM and the BHP. The other choice is rep;acing the pump and motor. Another choice is trimming the diameter of the pump's impeller...this will also reduce GPM ,head and BHP basically the same as replacing the pump but at a lower cost. The pump manufacturer can give you guidance in this process.

Good luck...Lou Bindner