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RE: [PSUBS-MAILIST] Pressure hull construction
Hi Marten,
You look like you are about to choose between an 1atm or an ambient sub. Am
I right?
Maybe you have to ask yourself some basic questions like:
What do you want to do with the sub?
How many times per year do you plan to dive?
Fresh or salt water?
Depth of the dive? (100 feet)
How many years you think your sub will be operational before you srap it.
Do you do scuba diving? If so, what do you like best about scuba diving?
What you don't like?
How will it be different in a psub?
How will you tow the boat? Will it stay on a peer?
What is the budget you plan for it?
How many years you want to spend building/designing it?
Will it be as fun for you to build it and gather parts as diving in the sub?
How long you want to be able to dive? (how many hours under the water)
Any passengers?
Etc...
I think that answering those questions might help you choose the correct
type of psub for you. I did the exact same thing and decided to switch from
1-atm to dry-ambient.
Once this is clear for you, then you will be able to move to the design step
I think.
I hope it help a bit!
Pierre "still looking for a hatch seal" Poulin
From: "Marten Liebster" <mliebster@tbteam.com>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: [PSUBS-MAILIST] Pressure hull construction
Date: Tue, 4 May 2004 12:45:11 -0400
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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