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Re: [PSUBS-MAILIST] Re: Increasing pressure inside hull
Depends on depths and time. To surface without a stage break
against decomression tickness - means surface slowly but without a stop
for scuba divers about :
40 Minutes in 20 meters (66 ft)
17 Minutes in 30 meters (98 ft)
6 Minutes in 42 meters (138 ft)
4 Minutes in 51 meters (167 ft)
3 Minutes in 60 meters (197 ft)
2 Minutes in 63-84 meter (207-276 ft)
1 Minutes in 87 and deeper.. (286ft -..)
If you stay longer and surface without some stops - there is a great
posibilty to get diver bends..
The maximum deep divers was (in a chamber) was 650 meter (2135 ft)
and it needs a month or so to bring them back to normal pressure.
If you stay deeper as 40-50 meter for more than a couple of minutes you
need a Trimix or heliox air gas mixture..
If you surface to quick - gasbubbles blown out in your blood.
Open a bottle of champaine to see the effekt..
A ambient sub driver without a dive course is more or less the
same as diver without a divecourse - just bloody crazy and stupid
a fucking amateur.. (hard words but maybe save someday a live or two..)
Carsten - progress is great here - will send some pictures within the
next 2-3 weeks..
jbarlow@bjservices.ca schrieb:
>
> Thank you. That makes sense. I was also wondering if anyone knows what
> the Max pressure the human body is capable on enduring and what sort of
> effects one can expect.
>
> Jay.
>
> Thanks,
>
> J. Barlow CET
> Sr. Mechanical Designer
> BJ Pipeline Inspection
>
> Ph (403) 531-5412
> Fax (403) 236-8740
> Cell (403) 807-2195
>
>
> "Thijs Struijs"
> <thijs-struijs@planet.nl> To: <personal_submersibles@psubs.org>
> Sent by: cc:
> owner-personal_submersibles Subject: Re: [PSUBS-MAILIST] Re: Increasing pressure inside hull
> @psubs.org
>
>
> 30/09/2002 02:42 PM
> Please respond to
> personal_submersibles
>
>
>
> Jay,
>
> Increasing pressure is done in case of an emergency escape from a sub. In
> the Busby book page 660 - 665 you can read more about it. It isn't fun. I
> doubt if you need to increase pressure in case of a leak. I suppose in most
> cases leaks are limmited to water seaping through seals. In other cases you
> won't have time to react (crushing viewports, or a pressurehull buckling).
> So I don't think it is worth while making a safety system like you
> discribe.
>
> Thijs Struijs
>
> ----- Original Message -----
> From: "Coalbunny" <coalbunny@vcn.com>
> To: <personal_submersibles@psubs.org>
> Sent: Friday, September 27, 2002 2:28 PM
> Subject: [PSUBS-MAILIST] Re:
>
> > Not silly Jay. It's an idea and all ideas are worth discussing. I
> > feel, atleast.
> > Carl
> >
> >
> > jbarlow@bjservices.ca wrote:
> > >
> > > This is a thought I had some time ago, and didn't know who to ask if it
> was
> > > a silly idea.
> > >
> > > What if one built a 1 atmosphere submarine with the ability to increase
> the
> > > pressure inside the hull quickly in case of a leak which would then
> stop
> > > the leak and give one time to get the leak under control. I realise
> that
> > > you would then have to decompress slowly. The hull wouldn't have to be
> > > designed for internal pressure because it would only be balancing the
> > > external pressure, but I think that any hull designed for an external
> > > pressure would be good the same pressure applied internally. I think
> the
> > > problem would come from some fittings which are only designed to take
> > > pressure from one side.
> > >
> > > How quickly can the human body take an increase of pressure?
> > > How high of a pressure can the human body take if the pressurizing
> medium
> > > is air?
> > > What if you had mixed gasses (diving gas) ready to pressurize the boat
> (in
> > > the bottle sized for the interior of the boat at Max depth plus some
> for
> > > the unknown leak) and thus diving gas was the pressurizing medium?
> > >
> > > Is this silly?
> > >
> > > Jay.
> > >
> > > Thanks,
> > >
> > > J. Barlow CET
> > > Sr. Mechanical Designer
> > > BJ Pipeline Inspection
> > >
> > > Ph (403) 531-5412
> > > Fax (403) 236-8740
> > > Cell (403) 807-2195
> >
> > --
> > "I learned this, at least, by my experiment: That if one advances
> > confidently in the direction of one's dreams, and endeavors to live the
> > life one has imagined, one will meet with a success unexpected in common
> > hours." Henry David Thoreau
> >
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