Urgent. White Vapour Escaping From Inlet Pipe After Switch Off

[Nicoli Unt]

I have a Coltri Portable Compressor MCH6 and ive only just noticed that once i fill a tank and switch off compressor there is a small amount of white vapour escping from the inlet pipe. This concerns me greatly. All diving is obviously off until i get a solution.

Anyone have any idea if something is wrong? I have dobe a rudimentary check of air quality in tanks, no bad smell or oil particulates as dar as i can tell

 

[rjack321]

Its water vapor from the gas in the hot first stage. It cools as it exits backwards out the inlet forming condensation. Only a small puff comes out due to the 1st stage check valve. Pretty normal.

 

[rcontrera]

Rjack is dead on. Splash lubricate compressors like the MCH6 and the JrII have a feeder that allows the oil "fog" from the crank case to be sucked into the first stage to lubricate it from the top. When you shut down, that fog that is either in the piston or in the line leading to it has to so somewhere so out the inlet it goes!