RE: [PSUBS-MAILIST] Welding Revisited

["Smyth, Alec" <Alec.Smyth@compuware.com>]

Recently I was at the human powered sub races and had a pleasant
conversation with the head judge. He's a gentleman with vast experience
in submarines, having served on many types of submarines throughout a
long career. He had dives to six thousand feet, and he'd been a DSRV
captain. He commented that his only interaction with personal
submersibles was as an expert witness in a lawsuit. The lawsuit had come
about because someone built a sub designed to go to many hundreds of
feet, but it failed at only 30 feet and one of the two crew died.

The stresses at 200 feet are major.


Thanks,

Alec 

  


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From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Lil Brother
LLC
Sent: Wednesday, July 25, 2007 12:25 AM
To: personal_submersibles@psubs.org
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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603-529-1100
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