Vacuum pump overheating?
- Thread starter ukflowzy
- Start date
ukflowzy
Member
Vacuum purging and also pulling a vac on my closed column but the thing has literally just gone out on me! Left it running case back to it off and not working
Fadedawg
Well-Known Member
A cheap rotary vane vacuum pump works fine for evacuating a column, but they aren't typically 100% duty cycle, so don't last long operating full time on a vacuum chamber or oven.
Rotary vane vacuum pumps also require regular oil changes when the incoming air stream is laden with solvents, so in those applications a dry scroll or a diaphragm pump are typically used. We've used both the Welch 2052 and the Edwards NXDS6i in that application.
They are of course expensive, and the relatively inexpensive rotary vane pump that we had the best luck in that application, was the CMP VP-6S, with regular oil change, sometimes in the middle of a run if the crankcase level starts to rise.
Rotary vane vacuum pumps also require regular oil changes when the incoming air stream is laden with solvents, so in those applications a dry scroll or a diaphragm pump are typically used. We've used both the Welch 2052 and the Edwards NXDS6i in that application.
They are of course expensive, and the relatively inexpensive rotary vane pump that we had the best luck in that application, was the CMP VP-6S, with regular oil change, sometimes in the middle of a run if the crankcase level starts to rise.
vennge
Well-Known Member
The cheaper pumps will run hot. But they will still work just fine. There is never a need to run the pump anywhere near an hour. If you are hitting ten minutes you are still running to long. Bring your chamber up to vac, close valve to chamber and shut off your pump. It will keep pulling everything out into suspension. Yes fire up the pump once in a while to keep your chamber at full vac. This will move out any of the air/contaminants as we;; fpr piece of mind. With many of the cheaper models you will more than likely need to release the vac pressure in order for the pump to fire up. Make sure it is running before walking away as you will fry it. Experience talking.
Cheers
V.
Cheers
V.
DemonTrich
Well-Known Member
A stopped vac will NOT continue to pull solvents. The vac needs to be ran continuous to keep pulling solvents. Reason why we run pumps 3 or more days when purging extracts.