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Home > Forums > Eng-Tips Groups > Eng-Tips Groups > COMPRESS Users Group Forum

 Flange MDMT

thread1259-255468
BigTank (Mechanical)
29 Sep 09 11:49
I have an exchanger model (36" O.D. with 0.375 in shell thickness) with 'ring type integral' flanges for the shell/channel junctions.  I get a message in the calculations saying the following:

'UCS-66 governing thickness = 0.375 in'

Obviously, as these flanges are thicker than 0.375 in.  The integral flange calc. uses the vessel shell as the hub for the flange.  So is Compress saying that the governing thickness for a hubbed flange is the thickness of the hub in the new condition?  I cannot find this statement anywhere in the code.  As this is a welded component, I would think the governing thickness for determination of MDMT is the flange thickness (which in this case happens to be 2.25 in).

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TomBarsh (Structural)
29 Sep 09 15:04
This is a corner joint and is treated as per UCS-66(a)(1)(b). The thinner material thickness will be the governing thickness for the joint.

 

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