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Re: [PSUBS-MAILIST] Hatch seal

To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] Hatch seal
From: "Brian Cox" <ojaibees@ojai.net>
Date: Tue, 4 May 2004 22:16:02 -0700
References: <BAY7-F59O8qPLlxw00d00000aec@hotmail.com>
Reply-to: personal_submersibles@psubs.org
Sender: owner-personal_submersibles@psubs.org
Pierre,  How about a tire inner tube?

Brian

----- Original Message ----- 
From: "Pierre Poulin" <pipo305@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, May 04, 2004 6:44 PM
Subject: [PSUBS-MAILIST] Hatch seal


> Thx Brian!
> 
> But I know what seal I want. I don't know if it will work but my problem is 
> finding it in a store...
> 
> I want to buy basicaly a rubber hose with a flat side that can be glued. 
> Since my sub is ambient, I imagine that there is almost no pressure on the 
> seal...
> 
> I will test that out and tell you guys!
> 
> Thanks again Brian!
> 
> Pierre Poulin
> 
> 
> >From: "Brian Cox" <ojaibees@ojai.net>
> >Reply-To: personal_submersibles@psubs.org
> >To: <personal_submersibles@psubs.org>
> >Subject: Re: [PSUBS-MAILIST] Pressure hull construction
> >Date: Tue, 4 May 2004 14:34:46 -0700
> >
> >Pierre (looking for hatch seal),   What kind of hatch seal are you looking 
> >for?  What is your delema?
> >
> >Brian
> >
> >----- Original Message -----
> >From: "Pierre Poulin" <pipo305@hotmail.com>
> >To: <personal_submersibles@psubs.org>
> >Sent: Tuesday, May 04, 2004 10:55 AM
> >Subject: 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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- [PSUBS-MAILIST] Hatch seal
  - From: "Pierre Poulin" <pipo305@hotmail.com>
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