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RE: [PSUBS-MAILIST] Pressure hull construction
When I get around to building my sub, I do intend on following the
applicable standards in the ABS handbook, regardless if it get certified or
not. How many personal (non commercial) subs actually get theirs certified
though?
I believe in the handbook it talks about scanning (ultrasound??) the hull
and welds to determine the quality.
Do they come to you? If so, it must cost a fortune.
If you have to ship your sub to them? If so it must cost a fortune.
Seems in theory that's no doubt what one should do. But in practice I'm sure
that it's cost prohibitive for everyone except for a Mark Cuban or Bill
Gates.
I'd imagine of that none of the 1 atm subs built by members of this group
have had theirs certified. So that's what lead to my question of how did
they achieve a "warm and fuzzy" feeling over the construction of their
pressure hull.
Marten
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Hugo Marrero
Sent: Tuesday, May 04, 2004 4:05 PM
To: 'personal_submersibles@psubs.org'
Subject: RE: [PSUBS-MAILIST] Pressure hull construction
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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