Dear all
I have following doubts in design of backing ring in heat exchanger with floating heads (backing rings split into two halves - 180 deg diametrically)

1. As per Appendix:2 thickness of split flange has to be computed taking 200% of bending moment computed for a solid flange; What is the basis of this 200% ? any published paper or book discusses this.

2. If we attach the two halves by bolting together using a strip the two halves become integral and hence will behave as a solid ring (integrity of attachment to be ensured); Can we then take only 100% moment leaving the split factor 2.

3. Further backing device thickness given in RCB:5-141, split ring of style B needs factor 2 but style A or style D does not need the factor 2. This is not reflected in ASME Section VIII Div.1 appendices

4. Actually our cases is like style A and also we are attaching the two halves by bolting; Can we justify no need of factor 2 based on these two criteria

Thanking You in advance
With regards

_________________
R.SRINIVASAN
Sr. VICE PRESIDENT
Head, Design and Engineering
PED,ISGEC,
YAMUNANAGAR
HARYANA -135001
INDIA