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# Re: tall cylindrical pressure vessels

• To: <seaint(--nospam--at)seaint.org>
• Subject: Re: tall cylindrical pressure vessels
• From: "Greg Smith" <strusup(--nospam--at)GTE.NET>
• Date: Sun, 21 Feb 1999 22:09:33 -0600

```How is this vessel supported ?  With Hurricane force winds, I would be
concerned with local buckling at the supports and would think to support it
longitudinally and internaly if possible i.e. loadpath= internal struts to
plane of external rings to longitudinal to ground.
I'm sure the D/t for this application is in excess of those referred to in
"Structural analysis of Steel Tubing" but the effects of internal pressure
and external pressure are the same as written.  quote: "internal pressure
will cause yielding to occur at reduced axial loads and bending or torsional
moments."  For UNIFORM external pressure the eq. given is:
Pcr=(2.2*E)/(D/t)^3 (for elastic buckling).
x=longitudinal...Nx= [Pw*x^2/(2*R)]* cos theta where as usual theta=0 at the
x axis and the wind is blowing from pos x to neg x as you are looking down
(plan view) at the cylinder.  The shearing force is
-Pw*x*sin theta and the circumferential force is Pw*R*cos theta.
You can then assemble these into a Mohr diagram to compare with the buckling
loads.  The above are for a cylinder supported at base only so adjustments
would have to be made to conform to the actual support conditions (moment
distribution).

Greg
-----Original Message-----
From: RShreenan(--nospam--at)aol.com <RShreenan(--nospam--at)aol.com>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Sunday, February 21, 1999 2:21 PM
Subject: tall cylindrical pressure vessels

>Hi sport fans and structural experts:
>
>Does anyone have  the source for the current state of the art structural
>design, software or publications, for tall steel cylindrical pressure
vessels
>in high wind (hurricane force) areas? The operating pressure is 30 psi +/-,
>the max. height 60' and the diameter 12'-16'.
>
>The proposed project is in Florida.
>