Re: [PSUBS-MAILIST] ABS hatch rules and alvin

["Herve" <caribsub@coqui.net>]

the 2 feet above the water line is not ABS rule but USCG rule. I have to
check i think it is 75mm
In the US a submarine to be approved for passenger service must have a
hatche 2 Ft above the water line, and an escape hatche for larger submarine.
if no compliance the sub can be only authorized for operations under charter
agreement. which is another story.
but who would design a sub with with an underwater hatch, if things  goes
not "as planed" the opening of the hatch converts your sub into a wet sub
starting an irreversible descent.
I have seen insurance fee for charter in deep submergence sub at $70,000 per
mission depending who is on board. john doe indeed is not insured the same
that james cameron .
Lloyds of london insures all submarines through affiliated underwritters
Herve
----- Original Message -----
From: "Thijs Struijs" <thijs-struijs@planet.nl>
To: <personal_submersibles@psubs.org>
Sent: Sunday, April 14, 2002 6:24 AM
Subject: Re: [PSUBS-MAILIST] ABS hatch rules and alvin


> Lucas,
>
> I do not know by whom Alving is insured, but I am pretty sure it is
> certified and insured. There are more subs with free flooding
conningtowers
> (Star 2 and 3, Deepstar 2000, Ben Franklin, Beaver). The hatch of Deepstar
> is located in the endcap of the pressurehull and thus below the surface.
> They probably use a pump to empty the tower.
>
> I am designing a psub with a free flooding conningtower. The big advantage
> is the simplicity (and strength) of the pressurehull. One could use (as
John
> Farrington suggested) 2 premade boiler endcaps weld them together, ad a
> hatch and a viewport and you have a pressurehull.
>
> Thijs Struijs
>
> ----- Original Message -----
> From: "Lucas Gray" <lgray@tera.engr.mun.ca>
> To: <personal_submersibles@psubs.org>
> Sent: Sunday, April 14, 2002 4:06 AM
> Subject: [PSUBS-MAILIST] ABS hatch rules and alvin
>
>
> >
> > I've heard and read that the ABS hatch rules are require about 2 feet,
> > from the hatch to the water line. The alvin submersibe does not appear
to
> > have this but instead has a free flooding (fiberglass?) conning tower
that
> > appears to have flood holes below the waterline. I assume that these
holes
> > are oneway valves such that after the water drains out a passing wave
will
> > not let water come back in. so the pressure hull hatch is at the water
> > line but the entrance hatch is 3? feet above the waterline... does this
> > simple modification satisfy the ABS rules..? if not, is the alvin
> > insured? by who?
> >
> > lucas
> >
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