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moisture problem

moisture problem

moisture problem

We used a SS316L pressure casing for an underwater measurements which consists of lithium metal batteries and data acquisition system.The system retrieved after one year of data collection.Brownish colour water was found at the bottom of the casing when it was opened.we did not carried out any vacuum or purging.The amount water found out may be 1liter. what could be the reason for the water entering to the casing. No leakage found out from the flange or sealing or any other side.

RE: moisture problem

What was the total contained volume?
Was there any temperature cycling?
Part of this is surely condensation 80F at 100%RH air has 22gr/kg of dry air.
But most of it must be from leaks. They are probably so small that only vapor was leaking in, but a year is a long time.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: moisture problem

Total cylinder volume was 0.03 cu.m
Temperature cylce was + 7 degree celcius to -1degree
The system depth was around 30m

RE: moisture problem

Pin hole leak somewhere.

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