Vacuum in the Box?
Vacuum in the Box?
(OP)
I recently came across an application where a seal leaked when the pump was stationary but the leakage stopped when the pump was running.
The seal was removed and as expected the SiC v SiC faces were heavily worn due to running dry.
Several theories were banded about (trapped air, inproper venting etc).
A gauge was attached to the box which recorded a vacuum!
I had never seen this and would have said its not possible.
Its, as far as I know, a standard centrif pump with a single mech seal.
How is the box pressure going so low and onto vacuum?
Hope there is enough info - its about all I have.
TIA
The seal was removed and as expected the SiC v SiC faces were heavily worn due to running dry.
Several theories were banded about (trapped air, inproper venting etc).
A gauge was attached to the box which recorded a vacuum!
I had never seen this and would have said its not possible.
Its, as far as I know, a standard centrif pump with a single mech seal.
How is the box pressure going so low and onto vacuum?
Hope there is enough info - its about all I have.
TIA
-
Milkboy





RE: Vacuum in the Box?
RE: Vacuum in the Box?
RE: Vacuum in the Box?
RE: Vacuum in the Box?
Just to clarify though JJPellin. Am I to understand from what you say, you would not usually expect to see vac in a box?
Usually the box pressure is somewhere between suction and discharge? Getting a vac could well be a total error?
We should be looking for the cause of the error/vac and possible adding a Plan 11 and bush.
Jet, good point, I will fond out if the impeller is adjustable. This could be the cause.
Once again, thanks for your time
-
Milkboy
RE: Vacuum in the Box?
RE: Vacuum in the Box?
Naresuan University
Phitsanulok
Thailand