There can be some really amazing things down deep. Karl Stanley has some wonderful pictures on his site.
http://www.stanleysubmarines.com/
Brent
From: "Lil Brother LLC" <lil_brother_llc@bellsouth.net>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: Re: [PSUBS-MAILIST] Welding Revisited
Date: Wed, 25 Jul 2007 23:28:24 -0500
>Joe,
>
>Ok....I'll change my answer to this.......it is possible to survive a
>depressurization at 200 feet, but very unlikely. At 900 feet we all know you
>won't, not a chance.( maybe by miracle)
>
>Also.....why go to 900 feet. There is little down there to see. If you are
>looking at something down there....you probably shouldn't be. I mean if you
>are poking around a shipwreck, that is a dangerous place for a submersible.
>Maybe research or something.....but a personal sub...come on. I think I
>would like to stay in the realm of regular scuba. If something does go
>wrong....at least I have a chance, even if it is a small one.
>
>James Long
>Owner/Designer
>Lil Brother LLC (Instrument Division)
>----- Original Message -----
>From: "Joseph Perkel" <joeperkel@hotmail.com>
>To: <personal_submersibles@psubs.org>
>Sent: Wednesday, July 25, 2007 10:23 PM
>Subject: Re: [PSUBS-MAILIST] Welding Revisited
>
>
>
>".............The statistics would say that you are mistaken. The human body
>(if not
>crushed) would be far more likely to survive the pressurization(even
>rapidly) at 200 feet,........."
>
>
>Careful there James. That statement makes me wonder about your appreciation
>for dive physiology.
>
>Big "D" lies at 235' and continues to take it's toll on people who prepare
>like this..
>
>http://www.mikey.net/scuba/pics/andrea_doria_july_2001/tami_night_dive.jpg
>
>Joe
>
>
>
>
>
> >From: "Lil Brother LLC" <lil_brother_llc@bellsouth.net>
> >Reply-To: personal_submersibles@psubs.org
> >To: <personal_submersibles@psubs.org>
> >Subject: Re: [PSUBS-MAILIST] Welding Revisited
> >Date: Wed, 25 Jul 2007 21:03:23 -0500
> >
> >Dan,
> >
> >You said the magic words:
> >
> >"Most psubers won't spend the money to x-ray
> >their welds , but would'nt you like to know they would pass a test if you
> >did one ?"
> >
> >I don't care who the person is, how good they are, there is a possibility
> >of
> >the weld failing x-ray inspection. If that were not the case, the U. S.
> >Navy
> >wouldn't x-ray every weld on a sub.
> >
> >Just because a highly qualified welder is diligent and does his best, does
> >not mean he will not make a mistake. He is human after all.
> >
> >You couldn't actually tell if the weld would pass an x-ray unless it is
> >actually performed. Granted the welder will be very careful about his work,
> >a third person is always less concerned with your safety than you are. This
> >is just a fact of human nature.
> >
> >"If your hull fails at 200 hundred feet you will be just as dead
> >as if it failed at 900 feet."
> >
> >The statistics would say that you are mistaken. The human body (if not
> >crushed) would be far more likely to survive the pressurization(even
> >rapidly) at 200 feet, but is extremely unlikely to survive at 900.
> >
> >James Long
> >Owner/Designer
> >Lil Brother LLC (Instrument Division)
> >----- Original Message -----
> >From: "Daniel Lance" <lanceind@earthlink.net>
> >To: <personal_submersibles@psubs.org>
> >Sent: Wednesday, July 25, 2007 8:04 PM
> >Subject: RE: [PSUBS-MAILIST] Welding Revisited
> >
> >
> >James,
> >If you tell a welder his welds are going to be x-rayed when the job is
> >completed there is a tendency for that person to be more diligent in his
> >work.
> >X-ray "quality"welding as it applies to Pressure Vessel Quality work means
> >a bare minimum of porosity, slag inclusions, undercut etc. and no tolerance
> >for lack of complete penetration and/ or non fusion in the root pass. A
> >submarine pressure hull must be built to PVQ standards to acheive 100% of
> >the hull integrity needed for its intended purpose.Setting the "bar" high
> >for selecting a weld process, procedure or weldor is whats necessary for
> >such a demanding application. Most psubers won't spend the money to x-ray
> >their welds , but would'nt you like to know they would pass a test if you
> >did one ? If your hull fails at 200 hundred feet you will be just as dead
> >as if it failed at 900 feet.
> >Dan Lance
> >
> >
> > > [Original Message]
> > > From: Lil Brother LLC <lil_brother_llc@bellsouth.net>
> > > To: <personal_submersibles@psubs.org>
> > > Date: 7/25/2007 12:45:47 AM
> > > Subject: [PSUBS-MAILIST] Welding Revisited
> > >
> > > Ok,
> > >
> > > We have discussed welding and the methods involved.
> > >
> > > Shouldn't we also discuss the situations that pertain to each type and
> >the
> > > critical requirement for each?
> > >
> > > I know that a professional welder knows what he is talking about, but I
> > > think x-ray on welds that will never pass regular scuba diving depths is
> >a
> > > little extreme on the side of safety.
> > >
> > > I'm not knocking safety at all, I tend to lean to the safe side of
> > > everything. But there is a point to overkill when it comes to safety
> > > measures.
> > >
> > > I agree, if you are going to depths of 600 -1000 feet, I would
> >definitely
> > > have the most certified welder available, and have the welds tested by
> > > x-ray.
> > >
> > > But I don't see the need to go to that measure if the sub is only going
> >to a
> > > max depth of 200 ft. I do see the need of the welds being proper,
> >airtight
> > > and strong.
> > >
> > > But I'm a realist, so I can handle the opinions from whoever disagrees
> >with
> > > me.
> > >
> > > James Long
> > > Owner/Designer
> > > Lil Brother LLC (Instrument Division)
> > >
> > >
> > >
> > >
> > >
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