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Pipe Coupling

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> Double-extra strong steel pipe Fy=36 ksi at l =0.0 feet
> maxed out at 337 kips.
>
> P(design) = 400 ton = 800 kips
>
> Overstress P(design)/P(allow) = 237%
>
> Can't do.
>
> ====================================================================
>
>  Job number or ID: Stevens
>
>  Designed for: "      PXX 6 "           metric size: PXX 152
>
>  Compression Member for Pipes Based on the 9th Ed. AISC Allowable Design
>                 * copyright © 1997 by Szuchuan Chang *
>
>  Input:  Column length =0.00 ft,         k_factor =1.00,
>          Axial load =800.00 kips,        F_yield =36.00 ksi,     E =29000.0 ksi.
>
>  Outside diameter= 6.625 in.     inside diameter =4.897 in
>  Steel area =15.600 in^2
>  Weight =53.160 lbs/ft   Wall thickness =0.8640 in
>          Elastic Properties:
>  I =66.30 in^4,   S =20.000 in^3,   r =2.060 in
>
>  AISC ASD 9th Ed. EQ. F1-2 ...
>
>  Design:
>  Check diameter-thickness ratio:
>          diameter/thickness (=7.67)  < 3300.0/Fyield (=91.67)
>          ASD Table B5.1 D/t -- The pipe is fully effective.
>
>          kl/r =0.00,   Cc = sqrt(2*pi^2*E/Fy) =126.10
>
>  k l /r ratio:
>          Since kl/r = 0.00 < Cc  AISC Eq. E2-1  govern.
>          f_a =(1.0-klr^2/(2*Cc^2))*Fy / (5/3+3*(kl/r)/(8*Cc)-(kl/r)^3/(8*Cc^3))
> =21.60 ksi.
>          Allowable load = f_a * area =336.96 kips
>          (P)design/(P)capacity =237.42%
> ===============================================
>
> Above is the output from 'StlShape.exe'
> To run the program yourself, please download from this site.
> URL : "http://members.tripod.com/~stlshape/index.html";
>
> Sam Chang, SE
> Cupertino, CA
>
> >From: "Rob Stevens" <engrathm(--nospam--at)ix.netcom.com>
> >
> >This one has been driving me nuts, can anyone help.
> >
> >I need a quick connect / release coupling for a 6 inch pipe that can handle
> >400 tons of compression or tension no torsion.
> >
> >Any ideas will be appreciated.
> >
> >Robert W. Stevens, Jr., P.E.
> >Consulting Engineer
> >
> >