popolarbear
Registered
Hi, im new to this board, im searching for info on the following subject on another website and stumbled on yours, so im reasking a question that ive not had much answers on my local website.
I'm curious to understand fully how water vapor cycles inside of a typical scuba tank. my limited understanding is that moisture is damaging to the internal tank. i also understand that in some limited very well set up stores, they have gone Thur very complex and expensive steps to remove as much water from the air stream. this is Thur various complex multi steps that each have benefits/draw backs to them. but one example is a very large ion-exchange resin bed that will ionicaly remove atomic water molecules from the inlet air stream, other methods of complex heating and cycling of the air as it passes Thur stages i don't exactly completely understand the chemistry or mechanical reasoning of how they work. Finlay many shops just have fairly dry air as a default of filling tanks indoors in a dry environment. no matter what method used some limited water vapor will eventually be inside under pressure. the various tank manufacturers have also methods of internal tempering that further resists the effects of water and oxygen on the internal surface.
my question is under high pressure what water is inside of the tank supposedly is as vapor not liquid. is that to assume that as a result of the high pressure/vapor phase of the water that it does not affect the internal of the tank as much. or what.
second part of this question is that rusting is accepted as an electrochemical process. in boats an actual voltage is measurable the instant an outboard or motor comes in contact with water. the voltage is actually molecules of metal ions moving across a gradient. in marine applications it is possible by understanding this chemical/electrical process, to reduce or almost prevent this process. example storing outboard in the down position in water is worst, storing outboard dry in the down position will have more electrical conduction to "earth" than electrically isolating it in the trim up position... taking this to the extreme storing your outboard on top of plastic sheeting and under a slight reverse electrical polarization will instead of rusting pick up random ions like electroplating.
......is it then possible to store the tanks over plastic sheeting also in a electrically neutral environment to further optimize life of tanks.
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oh that leads in to my next question, of understanding longer term storage stress on tanks. everyone agrees that should be stored under pressure, but is there an optimal pressure, either compleatly full or half pressure that is beter for tank.
my original question was mainly to understand what happens with moisture vapor in tank under high pressure.
because i noticed that there is a verry wide range in how varrious dealers are handeling moisture in the fill stations.actualy i think most are not going to any trouble to do the extreame removal. so the current belief must be that there is no problem with some limited amount of moisture in the tank under pressure.
ion exchange beds are a pain and expensive to maintain especialy if unnessessary.
sorry for long question. any thoughts or comments appreciated.
I'm curious to understand fully how water vapor cycles inside of a typical scuba tank. my limited understanding is that moisture is damaging to the internal tank. i also understand that in some limited very well set up stores, they have gone Thur very complex and expensive steps to remove as much water from the air stream. this is Thur various complex multi steps that each have benefits/draw backs to them. but one example is a very large ion-exchange resin bed that will ionicaly remove atomic water molecules from the inlet air stream, other methods of complex heating and cycling of the air as it passes Thur stages i don't exactly completely understand the chemistry or mechanical reasoning of how they work. Finlay many shops just have fairly dry air as a default of filling tanks indoors in a dry environment. no matter what method used some limited water vapor will eventually be inside under pressure. the various tank manufacturers have also methods of internal tempering that further resists the effects of water and oxygen on the internal surface.
my question is under high pressure what water is inside of the tank supposedly is as vapor not liquid. is that to assume that as a result of the high pressure/vapor phase of the water that it does not affect the internal of the tank as much. or what.
second part of this question is that rusting is accepted as an electrochemical process. in boats an actual voltage is measurable the instant an outboard or motor comes in contact with water. the voltage is actually molecules of metal ions moving across a gradient. in marine applications it is possible by understanding this chemical/electrical process, to reduce or almost prevent this process. example storing outboard in the down position in water is worst, storing outboard dry in the down position will have more electrical conduction to "earth" than electrically isolating it in the trim up position... taking this to the extreme storing your outboard on top of plastic sheeting and under a slight reverse electrical polarization will instead of rusting pick up random ions like electroplating.
......is it then possible to store the tanks over plastic sheeting also in a electrically neutral environment to further optimize life of tanks.
----------------------------
oh that leads in to my next question, of understanding longer term storage stress on tanks. everyone agrees that should be stored under pressure, but is there an optimal pressure, either compleatly full or half pressure that is beter for tank.
my original question was mainly to understand what happens with moisture vapor in tank under high pressure.
because i noticed that there is a verry wide range in how varrious dealers are handeling moisture in the fill stations.actualy i think most are not going to any trouble to do the extreame removal. so the current belief must be that there is no problem with some limited amount of moisture in the tank under pressure.
ion exchange beds are a pain and expensive to maintain especialy if unnessessary.
sorry for long question. any thoughts or comments appreciated.
