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Oil Coking limits
2

Oil Coking limits

Oil Coking limits

(OP)
We use magnetic face seals in place of lip seals on a wide variety of applications, usually on pumps but alos gearboxes and other equipment. The only factor limiting the speed of operation is the heat generated and this cokes (carbonises)the oil.
I am looking for information on what the coking temperatures would be for a range of proprietry  oils. The oil companies do not seems to give this information on their data sheets and a brief trawl of the internet failed to get anything meaningful.
Does anyone have any pointers they could give me so I can find the coking temperatures, or am being too simplistic and getting into a very complicated area?

RE: Oil Coking limits

I hear anything from 120 to 150 centigrades allowed before getting problems with the oil in the bearings. I have never seen that in print, but it is something that the SKF guys mention now and then. I also have the impression that they never want to go to the upper limit but regard the lower limit (120) as something that should not be exceeded.

Gunnar Englund
www.gke.org

RE: Oil Coking limits

The data I got when working as a marine engineer from the "old guys" was 120deg C - after that the oil carbonised - everthing in a marine engine with oil lube to white metal is kept below this value as the carbonisation of oil blocks oilways.

As for your seals - dependant on what the application is labrinth seals (no contact) are use in marine steam turbines for high speed applications & can be successfully adapted for many other "problem" areas.

I'eve used them for rod seals on pneumatic cylnders on plastic thermo forming machines where standard nitrile & viton seals have failed.

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