[PSUBS-MAILIST] inside battery

[Sean T. Stevenson via Personal_Submersibles]

There may always be trace constituents of the cabin air that are not air gases, as a result of installed equipment, lubricants, flatus, component offgassing, chemical residues, body odours and so forth. As long as these remain in only trace concentrations, they aren't a worry. I would suggest though that the greatest hazard presented by spillable oil volumes in the personnel compartment is not the risk of fire (although that exists), but rather contamination of the cabin air. It may be prudent to include, in addition to a caustic scrubber to remove CO2, a catalytic or activated charcoal filter to remove these trace contaminants (acid gases, volatile organic compounds, hydrocarbons, etc.) to keep the air clean and (ideally) odourless.

As for the batteries, with the oil compensation in place, how is hydrogen eliminated if offgassing occurs during charging? My own design incorporates outboard batteries in 1 atm housings, which are flushed with sulfur hexafluoride gas. That supresses the spark / fire risk, while keeping everything clean and dry for servicing.

Sean


On February 20, 2017 12:07:49 PM MST, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>I'm assuming the oil filled battery was meant to go outside and
>therefore
>is completely airtight? Of course one would not want an open oil tub
>inside, I agree with that!
>
>:)
>
>Alec
>
>On Mon, Feb 20, 2017 at 11:40 AM, Bryce Schroeder via
>Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>> Unless "oil" means something like a perfluorocarbon / flourinert or
>> something, I would think it would present a fire hazard if the
>battery
>> shorts out? Especially if the battery is "mostly" drained of oil and
>so
>> contains air and oil together. A little oil burning off could make
>the
>> atmosphere bad in a hurry... just my two cents.
>>
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