I researched using HY-80 or HY-100, and ran into the issue that it was only
material available as plate, and even then it was very hard to find.
Suppliers were asking me "what are you building, a missile or a tank?" and
quoting accordingly. I was unable to find off the shelf things like endcaps.
So while it is possible to purchase the plate and have reqorked into an
endcap, it would add enormously to the cost relative to off the shelf
components. I guess you could come up with a hybrid design, using plate for
the skin of the main pressure vessel, and 516 gr 70 for the other parts.
rgds,
Alec
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of
vbra676539@aol.com
Sent: Monday, September 11, 2006 7:01 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] K-350 Reinforcing Rings
Theoretically it would give you, what...a sixty percent increase? But you'd
have to recalculate and redesign all the penetrations and viewports to
match.
Vance
-----Original Message-----
From: thomas.doster@gmail.com
To: personal_submersibles@psubs.org
Sent: Mon, 11 Sep 2006 12:54 AM
Subject: Re: Re: [PSUBS-MAILIST] K-350 Reinforcing Rings
As someone who welds on submarines for a living, I'd have to agree
with Dan H's methodology for welding the rings. It is a good way to
minimize the stress. With regard to what Leon contributed, I think
it's imperative that anyone even considering building any sort of
pressure vessel knows these things. Understanding the stress that
welding causes on steel is VERY important to know, especially when
your life is being supported by it. While there are a few methods of
stress reduction, not all are readily available to all PSubbers. The
best idea, if you haven't spent any time welding professionally, or
even if you have, is to read over some corporate welding requirements.
Anything you can get your hands on. A lot of them specify pre-heat and
interpass temperatures, joint design specifications, and many other
things. I think the American Bureau of Shipping documentation on
Hyberbaric Chambers has a lot of these things in there as well.
If you have the time, sit in on a metallurgy class at a local college.
Or attend as a student. If you're welding yourself, there are SO MANY
things you can and should learn before tackling such a project.
One question I have for Dan, Leon, or anyone else who knows:
Has anyone constructed a K-350 submarine out of HY-80 steel or any
other material? Would that increase it's depth capacity? What do the
plans specify?
Thanks,
-Tom
On 9/10/06, ShellyDalg@aol.com <ShellyDalg@aol.com> wrote:
>
>
> Hello. One more thing. I asked the question about stress relieving the
> finished hull also. There are some companies that have huge ovens to do
just
> that. One in Texas that makes the tank heads I want does it on tank heads
> for high pressure, and will even do a whole tank.
> Their oven is very large. I think stress relieving is required on tanks
that
> store very cold things and create problems with cold brittle stress.
> The company is " Fort Worth F & D Tank Head " --great prices there.
> Frank Dalgleish.
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