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I used to run a desiccant chamber filled with a mix of dyed Silica Gel (turns from blue to pink when water vapor saturated) and plain Silica Gel. Was a PITA to regenerate all the time plus it absorbed oil vapor.
Now, I simply keep the MINIMUM amount of fuel on board as needed and empty the tank for long time 'haul outs'. If I feel the tank oil has become 'saturated', I recirculate the oil through a water ABsorbing filter to 'trim' its saturation level.
Again, the least amount of oil in the tank will 'pick up' the least amount (mass) of water. Condensation only means that the oil it totally saturated with water from the atmosphere, and it makes no difference if the the tank is full, 1/2, or near empty .... its just that a near empty tank will have the least 'absolute' amount of water. As long as the tank is connected to or 'communicates' to the ambient atmosphere, the oil will eventually 'saturate' with water due to the 'Laws of Partial Vapor Pressures' (saturation).
If one had an explosion proof vacuum pump all one would have to do is remove the oil, pull a high vacuum until most of the water 'flashes' out .... a pretty standard method of 'significant' water removal from oils in the 'high tech' and power generation industries.
Last edited by RichH; 04-19-2011 at 05:00 PM.