RE: [PSUBS-MAILIST] Pressure hull construction

[Hugo Marrero <HMarrero@hboi.edu>]

Marten,

The American Bureau of Shipping (ABS), Lloyds Ships Registry, and many other
internationally recognized agencies (which are the equivalent of the F.A.A.)
do have these standards available. If you purchase the book I mentioned to
you a few days ago and read it, many of these questions will be answered for
you.

Hugo

-----Original Message-----
From: Marten Liebster [mailto:mliebster@tbteam.com]
Sent: Tuesday, May 04, 2004 12:45 PM
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] Pressure hull construction



Those with 1 atm subs, how is/will be your pressure hull be constructed?

Was/will it be assembled by yourself or by a fabrication shop?

Even if I were to design the perfect (unlikely) psub, I don't know if I
could trust myself or someone else with my life. 

Taking a trip in an airplane is different. There are industry and federal
standards for the construction, usage and maintenance. Also there are
rigorous inspections. Plus, each plane isn't a one off creation. Also,
ignorance is bliss. :-)

So even though I would spec out the proper material and proper welding
techniques, there's still that feeling of uncertainty. Even it was to be
pressure tested to 2x operating depth, in the back of my mind would the
possibility of problems developing over time with things I had built for
myself. 

Safety being the primary concern, this might be a deal breaker for me (not
for others, it's a personal decision) for a 1 atm sub. I misquoted a figure
in a previous posting - 100ft = ~6000 lbs of pressure per square foot - I
incorrectly stated PSI. That's about the max operating depth I planned to be
at. Doesn't seem to allow for too large of a margin for a badly fabricated
pressure hull.

This has sparked another related question: 
Would properly engineered (pardon my misuse of English) internal framing
widen the margin for error? 

Thanks again to all who have helped me to better understand how a sub is
properly designed and engineered.

Marten




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