CASING PUMP PICS

[gorkus]

Please have a look at these pics.

http://picasaweb.google.es/mulder.pirata/LbumSinTTulo/photo#50702826

http://picasaweb.google.es/mulder.pirata/LbumSinTTulo/photo#5070282678688807810

Coud you give me any advice about it?
Many thanks in advance
Its a vane pump, whose casing has broken in this way
we don´t know what the reason is.
I give you some details:
Fluid: olive oil
Working Tª:20ºc
density 0.9 kg/dm3
Flow: 30000 l/h
Working pressure: 3 bar
Pump speed: 640 rpm
viscosity at working Tª= 500 SSU.
pipe diameter 3"
pumps port diamter: 21/2"

 

[JJPellin]

You did not mention if this was a sliding vane or flexible vane design. We have sliding vane compressors which have experienced similar catastrophic failures. In these machines, the vanes wear at a slow rate during normal operation. If the wear of the vanes is allowed to progress beyond a certain point, the vanes get short enough to come of out of the grooves in the rotor. The vanes can then lodge between the rotor and the inner casing resulting in sudden catastrophic failure. A pump (or compressor) of this sort would also have a pressure limitation that would be critical. If the pressure on the discharge were too high, the vanes could break or fold over and a similar failure could occur. I would disassemble the pump and inspect the condition of the vanes. If they are sliding vanes, measure the length of the remaining vanes and compare that to the pump manufacturer's recommended minimum length. Also check with the operators to see of there is any chance that the pump ran with unusually high discharge pressure or was accidentally run blocked in.

Johnny Pellin

 

[gorkus]

They are a sliding vane pumps.These pumps only have been working for 14 days. I mean The vanes dont have time in order to wear.
So it would be caused by ambiental temperature changes, but there is not a big diference between the day and the night.

 

[Cheddarcaveman]

In such a short period of time one has to suspect either a casing problem, ie poor casting, or a process problem ie shut discharge and inoperative relief valve.
Probably the latter I suspect as a reputable pump manufacturer would pick up such a serious problem with a casting.
Check the process history. Who made a boo boo???