Minimum Level for Vortex
Minimum Level for Vortex
(OP)
I was looking to find an equation for minimum tank level for a vortex to occur in outlet piping and found this...
http://www.pumpfundamentals.com/help11.html
My application is a bottom drained tank (3" discharge nozzle) connected to a pump flowing between 20-60 GPM. Unfortunately, the equation on the site is only valid for 2-8 ft/s and I'll be in 1-2.5 ft/s range.
Can I still use this equation? Is there any other equation to determine this minimum vortex height for lower flow applications?
http://www.pumpfundamentals.com/help11.html
My application is a bottom drained tank (3" discharge nozzle) connected to a pump flowing between 20-60 GPM. Unfortunately, the equation on the site is only valid for 2-8 ft/s and I'll be in 1-2.5 ft/s range.
Can I still use this equation? Is there any other equation to determine this minimum vortex height for lower flow applications?
-Mike





RE: Minimum Level for Vortex
RE: Minimum Level for Vortex
I can't imagine that a pit containing water at a level above a pump or offtake (right at minimum submergence) that is at the brink of forming a vortex would be at that same point of vortex generation at that same level if the fluid were suddenly changed to something like 40W lube oil. Or worse, #6 fuel oil. It might be better, it might be worse, but I can't see it being the same.
If I am wrong, someone please educate me fast and give some good references. Thus far my searches haven't produced them. I need more than my gut here.
This isn't homework.
rmw
RE: Minimum Level for Vortex
THE VORTEX SUBMERGENCE IS ONE DIMMENSION OF OTHER IMPORTANT DIMMENSION CRITERIA/DIMMENSION AND CONSIDERATION.
MORE COMPLETE DATA YOU FILN IN:
ANSI/HI 9.8
American National Standard for Centrifugal and Vertical Pump Intake Design
RE: Minimum Level for Vortex
A couple of links which could be of interest
http
http