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Provac Blog > vacuum leak

rotary vane pump technical tips vacuum leak

“Smoking" Oil-Sealed Rotary Vane Pump

  Question: What is causing the “smoke” coming out of my oil-sealed rotary vane pump exhaust ? Answer: A common complaint we hear about oil sealed rotary vane pumps is that they create a lot of “smoke” from the exhaust. What is commonly reported as “smoke” is often actually oil mist vapor.  The oil in your rotary vane pump both lubricates the moving parts and seals the fine clearances in the pump. Oil has the benefit  of stopping air leakages inside of the pump, however the rigorous oil flow during operation creates an oil mist on the exhaust side of the pump.  An unusual increase in oil mist vapor can indicate that there is a vacuum leak in your system....

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