How does moisture enter tanks?

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Rol diy

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After all this posting and practical testing, we can conclude:

That if at 80ish ft you breath your tank down to 40ish psi on your gauge, (if you can read that fine on your gauge)
and sink to 100 ft because you died.
You will most likely get water in your tank, and eventually your gauge will read 50ish psi
Because of the water filling your tank,
 

Tracy

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After all this posting and practical testing, we can conclude:

That if at 80ish ft you breath your tank down to 40ish psi on your gauge, (if you can read that fine on your gauge)
and sink to 100 ft because you died.
You will most likely get water in your tank, and eventually your gauge will read 50ish psi
Because of the water filling your tank,
Correct. So best bet is to not do that because your gauge will be full of water and your regulators will need to be serviced before use by the recovery diver.
 

Tracy

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Exactly as expected.

Notice the little cloud of water vapor form for a second as pressure was released? That was from the cooling as the air expanded before returning to ambient temperature. I'm guessing that is a shop compressor without extensive drying and not regulated down dive air.
It is a low pressure shop compressor with very extensive cooling and filtering. It is the drive gas for the booster wall. The vapor is from the standing water in the pressure pot that I dumped out seconds before I slid the gauges in.
 

broncobowsher

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It is a low pressure shop compressor with very extensive cooling and filtering. It is the drive gas for the booster wall. The vapor is from the standing water in the pressure pot that I dumped out seconds before I slid the gauges in.
OK. That makes sense.
 

clownfishsydney

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Well, most of the replies to the original question have nothing to do with it. Water can only really get in via compressor (poor filtering) or getting blown in when a wet valve is connected to the compressor or if a totally empty tank is under water and valve open.
 
https://www.shearwater.com/products/peregrine/

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