Re: [PSUBS-MAILIST] inertia calculation for stiffeners

["Tom" <tbales@mn.rr.com>]

can't help you...new to the board here.  I'm from Mn...mpls...have contacts
to people who can build 1/4 " steel tubes, nice to see someone from MN....in
the process of cashing out a bunch of equity.... I love subs...been thinking
about building one for a few years. The builders I'm talking about used to
make my furnace linings not bad on the price...........12' long by  4' high
should be less then 1800$. I'm not trying to sell you anything, Just
starting in this with a buddy of mine. If I was selling...it would be a home
(x-foundry...now REALTOR). One day maybe we could dive Superior.







----- Original Message ----- 
From: "gordon alexander" <gordon@curio.com>
To: <personal_submersibles@psubs.org>
Sent: Monday, June 21, 2004 6:15 PM
Subject: [PSUBS-MAILIST] inertia calculation for stiffeners


> I have been trying to use the formulas in section 6 (Metallic Pressure
> Boundary Components) of the ABS "Rules for Building and Classing
Underwater
> Vehicles, Systems and Hyperbaric Facilities". I have a question for any of
> you fellows out there who have a grasp of the inertia calculations for
> stiffeners in pressure boundaries. I note that the inertia formulas for
both
> heavy and non-heavy stiffeners (19.15.1 - pg 67 and 19.15.2 - pg 68)
contain
> "P". This is the external applied pressure, no? What is it doing in a
> formula used to determine the failure pressures of pressure barriers? It
> seems a bit circular to me at this point. My head hurts:-(
> Can anyone tell me what is going on here?
>
> Gordon Alexander
> Shakopee, MN
>
>
>
>
>
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