[PSUBS-MAILIST] buoyancy

[Alec Smyth via Personal_Submersibles]

Good creative idea, I hadn't thought of pressurizing a tank to increase its
depth rating. But the downside is more complexity, and I would still
dislike not knowing what the external pressure rating of the tank would be.
The complexity probably has very, very low risks, but they do exist. Like a
risk of the tank inadvertently leaking its air before a dive, or the risk
of the tank rupturing on the surface for whatever reason (e.g. careless
impacts, trailer accident, too hot in the sun, etc...) My new boat is a
pursuit of simplicity, so if it were me I would go with floats just because
they have no moving parts and known ratings.

Best,

Alec



On Wed, Nov 11, 2015 at 8:33 AM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> I was thinking about using CNG (compressed natural gas)  tanks for
> buoyancy.  The type 4 tanks are carbon fibre and rated for 3,600 psi and
> very light.  My idea was to keep the tanks full of compressed air so they
> can withstand the sub depth rating plus a safety margin.   I am liking
> trawl floats may be better now because they are rated high enough and not
> air filled.  The CNG  tanks are much cheaper and conveniently shaped.
> Hmmm not sure now.??
> Any thoughts or concerns anyone????
> Hank
>
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