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Flat Head with Retaining Ring UG-34(m)

Flat Head with Retaining Ring UG-34(m)

Flat Head with Retaining Ring UG-34(m)

(OP)
When using a retaining ring (Figure UG-34(m)) to hold in a flat head, I have to maintain a factor of safety of at least 4 against all possible means of failure, per UG-34(d).

One of the listed failure modes is radial deformation (flaring of the end of the vessel).  The code doesn't provide any real guidance for a preferred method of calculation.  In your opinion, how would you calculate this bellmouthing/flaring/radial deformation for a pressure vessel?  And what would my factor of safety be against in this case (deformation, slope, etc)?

general info:
(Section VIII Div 1)
(ID = 54 in)
(P = 1900 psi)
(t = 5.625 in)
(definitely not a thin walled pressure vessel)
 

RE: Flat Head with Retaining Ring UG-34(m)

Take a look at prEN14359 this has a number of analyses that consider flaring.

RE: Flat Head with Retaining Ring UG-34(m)

(OP)
Thanks, Fawkes.  I'm trying to get my organization to buy a copy.  We're pretty unfamiliar with CEN specs here.

Are there any other standards that provide analytical methods that anyone knows of?

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