bimr the manufacturer gives a min operational Q of 90 qmph. But I guess this is for cold water . Is there a way to translate this to my operational temp?
clay it is a possibility
stanier there would not be enpugh head
Artisi you are right i will come back with moore data I promise.
Big inch I...
bimr the pump runs at half the flow due to operational reasons. Air ingestion is a possibility but there is severe damage of the impeler. The damage actually is in both sides but it is more serious in the obvious side ( the one you dont need a mirror to see). Recirculation is one of the...
TD2K I am measuring after the strainer before the pump suction. The gauge pressure is 0.2 bar.
bimr The suction line is DN 450. does the matter that i am measuring gauge pressure change anything?
stanier yes the pump is running at the right direction. It is definitely cavitation due to the...
Ok sorry for the misunderstanding.
We have a closed tank wih water at 45 Celcius. The tank is elevated 10 meters. It is in -0.8bar vacuum.
In the suction line there is a strainer and a buterfly valve.
A pressure gauge at the suction of the pump shows 0.2 bar.
Dos this mean I have NPSHa = 2 -...
I think that manometres show deferential pressure.
but when calculating NPSH we need absolute pressure.
Am I wrong?
You are right its a strainer.
Excuse my poor English.
1gibson thanks for the interest.
No the manufacturer did not do a test.
It is a centrifugal pump single stage closed impeler.
How do u find the tip speed? The pump runs at 2900 1/min.
The pump sucks from a tank which is 10 meters higher. The tank is closed and there is 0.2 bar pressure in the...
Hi to all fellow engineers.
We have a pump that cavitates despite there is enough NPSH.
The working fluid is water at 45 Celcius. Pressure just before the pump is 0.2 bar that means NPSH=12m, well above the NPSHr.
What are the possible reasons for this except wrong curve from the manufacturer?
