Head pressure from tanks

[Isfakul]

Hi,
I have an underground arrangement of 3 setteler tanks and i want to determine NPSHA as the pump is cavitating fast.
What would be the best way to determine the head from the 3 tanks?

 

[GD2]

The pumps surely don’t have adequate NPSHA. With rocks, cements, fibres in the suction line/ settler tanks, obviously, the actual available liquid head will be less than the elevation difference and a clogged suction.

GDD
Canada

 

[Isfakul]

Thank you guys. I do think its not enough. Also for the strainer to work efficiently it does require 200kpa minimum, but my pressure decreses overtime as the settler tank gets lower. So a booster pump will be required.
And Ofcourse the underlying issue as to why the settler is not capturing the fibres rocks etc is also an issue that has to be addressed.

 

[GD2]

Why don’t you try this first:
1. Find ways and means to remove rocks and other material coming to the tanks.
2. See if you can set the LL levels for both suction tanks to higher elevation to give more NPSHA.

GDD
Canada

 

[TugboatEng]

If you're pumping from the settler at too high of a rate that could bring the debris back in to suspension.