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Re: [PSUBS-MAILIST] Condensation in a psub



Hi Frank D
Many years ago I dived for a company that used woman's pads(unused) in there filters of there hookah low pressure  air systems I remember the air used to be so dry. Nowadays with the baby dippers that one gets that absorb amazing  amounts of fluid maybe a canister designed with a maize shaped inner and a drainable sump with a small fan pulling air thru could work.
GlenSA
----- Original Message -----
Sent: Sunday, February 07, 2010 6:57 PM
Subject: Re: [PSUBS-MAILIST] Condensation in a psub

In a message dated 2/7/2010 7:12:22 A.M. Pacific Standard Time, jonw@psubs.org writes:
Condensation is an issue as well but hopefully we can find solutions to
counter it.
This brings up a point that has sparked my interest on several occasions.
We've heard mention of condensation on windows, bilge areas, and general corrosion issues inside our subs.
Good paint, diligent maintenance, and the use of stainless and epoxy potting where possible are methods to help keep the damage to a minimum. I have tried to keep my various fabrications and overall design geared toward maintainability as much as possible, knowing that I'll need to grind out and re-paint on a regular basis. No computers on-board but some electronics are necessary. ( my Margarita blender has a hand crank )
Preventing and managing condensation could be a large part of a good maintenance program.
The air circulatory system in our little boats seems like the logical place to attack the problem of excess condensation.
With or without a CO2 scrubber system, it could be beneficial to have a water scrubber in a psub.
I wonder how a canister of desiccant could be incorporated into the duct system, or how effective it would be at removing moisture from the cabin air.
Some of our northern members like Dean have expressed interest in a heater for the sub. Others have mentioned the increased moisture when operating in tropical waters.
Can a canister of desiccant be dried out and re-used ?
How much electrical energy would be used to drive such a system ?
How much air volume would need to be processed per person ? 
Can a "water trap" be made with a reservoir that can be dumped after each dive ?
How much water actually collects in a sub ?
Does a bilge need a pump or would a sponge be enough to evacuate the water ?
Anybody got any ideas on this ?
Frank D.
 



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