10 replies to this topic

[Jaldhipatel]

It is possible that i have 2 fluid one is lighter in density and other is heavier..then for same discharge head i need multistage pump for lighter one and single stage pump for heavier fluid.

[fallah]

It is possible that i have 2 fluid one is lighter in density and other is heavier..then for same discharge head i need multistage pump for lighter one and single stage pump for heavier fluid.

 

In general, you need to design the pump for heavier fluid...

[Jaldhipatel]

Sir i have to transfer fluid to same height but 1) lighter 2) heavier fluid then it is possible that for lighter fluid i require multistage pump but for heavier i need single stage pump...is this possible..

[Bobby Strain]

You must perform hydraulic calculations to ascertain. That's what engineering is about.

 

Bobby

[bibalan]

If you are talking about centrifugal pumps and suction pressure and viscosity of fluids are similar, you would need a single stage pump for lighter fluid and extra stages to reach the same height for heavier fluid. Pay attention to pump curves for different viscosities.

[Jaldhipatel]

Is that any specification for which we have to use multistage pumps..? Pls guide as i want more knowledge about where to use multistage or single stage...pls help..

[justinallen]

When you attempt to mix two liquids which have different densities, they separate when you stop mixing them. The "heavier" liquid deposits itself on the bottom and the "lighter" liquid deposits itself on top. There exists a wide range of liquids with various densities.

 

https://www.membracon.co.uk/ 

[Chemitofreak]

If I were you, I would have done hydraulic calculations for both the cases i.e. high and low density. I will put both the cases on the datasheet and let the vendor decide.

 

If you want a quick check if single stage or multistage pump is required, ask your Mechanical Dept. or google for pump selection chart some thing like the below:

 

https://www.research...fig21_286198429

 

Regards 

[POuria95]

There is one rule of thumb for choosing multi stage or single 

for each 150 m head you need one stage.

and its not depended on density and viscosity. 

[breizh]

https://blog.craneen...l-pump-used-for

 

hi,

Let you try your favorite search engine and talk to representatives in your area.

Good luck

Breizh

[horatorres]

you should calculate the pump head requirements for both cases,, light and heavy fluid.. It will give you your power, head and discharge pressure, 

 

Multistage pumps are used when a normal one stage pump will no handle the head requirements, Usually each stage have 60 mt head as upper limit, (6 bar as discharge pressure) but the manufacturer must give you this advice,

 

Horacio

Edited by horatorres, 21 April 2021 - 11:33 AM.