pump capacity and flow

The friction losses will be less and the duty point on the centrifugal will move to the right on the pump curve.

To obtain the new duty point you have to draw a new system curve and find the intersection with the pump curve.

Note that the power requirements will most probably increase.

the head

Yes - that is correct as above.

Everything else remaining the same - if you increase discharge line size, you will see an increase in flowrate and an increase power required, due to less frictional losses in the piping.

And how much increase in flow you will receive needs to be determined by your pump curve and a system curve with the new piping.

you could also get the same exact fflow if your pump has a flat curve like sundyne pump.

Hi Sandeep lokhande

I see from your other post that you may be pumping glycerin.

What pump are you using?

A positive displacement pump won't show a noticeable increase in flow but will use less power.

please tell me suitable pump for pumping glycerine.

storage tank capacity is 14 ton

from storage tank pipe line length is 80m for discharge

suction line is just 0.5m

elbows 8nos discharge

discharge line having 2 valves

suction line having 2 elbows and 1 valve

glycerine viscosity is 1500cP which i got from wikipedia

glycerine specific gravity is 1.285

please tell me the suitable pump for capacity atleast 5m3per hr.

now we are using centrifugal pump but it failed.

I don't know much about pumping glycerin but think a positive displacement pump may be better.

Google for gear, lobe, screw etc pumps (starting in Kenya).

Do you have any idea why the centrifugal failed?

Did you consider eliminating the 2 elbows on the suction side or is it possible?