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RE: [PSUBS-MAILIST] Lengthwise internal supports

Hello everyone, I have been quietly sitting in the background. But trying to pay attention. Plan to start on my sub before winter. Just a quick comment on the T rings. I am considering flanges for sheet metal pipe. Usualy they are approx 3/16"x 1 1/2"x1 1/2" or 2"x2" rolled angle. Two of these back to back for each brace, may just do the trick. Should be available from any sheet metal shop or sheet metal supply house fairly inexpensive.
I hope to be more active in the discussions. Have really enjoyed all the discusion thus far. 

Thanx Ron


From: "Cliff McDonald" <cmcdonald@applikonusa.com>
Reply-To: personal_submersibles@psubs.org
To: "Personal_Submersibles" <personal_submersibles@psubs.org>
Subject: [PSUBS-MAILIST] Lengthwise internal supports
Date: Thu, 11 Aug 2005 16:34:37 -0500

Hello psubbers,

I?ve got another mechanical engineering question for you:

I?ve been trying to think of a way to simplify the internal bracing on a
cylindrical pressure hull.  The ?T? rings that are commonly used for
internal stiffening seem to be a difficult part to make and I can?t find a
good (cheap) source for them.  There are plenty of fabricators that would
love to make several of them when I?m ready but the cost for this is greater than the total cost of a rolled cylinder and the endcap / bulkheads (which I can fab myself). I could reduce cost by cutting small sections of the ?flat 
ring? portion out of sheet steel, and try to roll the bands myself but this
is going to take a lot of cutting, welding and piecing together.  I think
the total strength of a pieced together T-stiffener would be compromised as
well.

Has anyone ever run the majority of internal bracing lengthwise through a
cylinder?  Since the main portion of the pressure hull is a straight
cylinder, it would be pretty easy to run some ordinary channel or angle iron 
the length of the cylinder.  Spaced about a foot apart and with internal
bulkheads spaced at reasonable distances (for example, one bulkhead centered 
in a 48? OD by 96? long cylinder), I think this would be as strong as
T-rings spaced every foot.  It would be much easier to build and weld,
should reduce flexing and twisting, and would make length wise tubing and
wiring runs tuck away a little neater.
Thoughts?

Thanks and Kind Regards,
Cliff McDonald


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