Hi
I found in Kellogg's methodology (subject 3810 page 8/13) that for normal operating, the total allowable stress is 2xSh but most companies use 1.5xSh. Is there is any explanation.

Also is there is any recommendation for the allowable stress in blast case.

Thanks

Can an expert answer please.

Thanks

Hi,
For blast, Maximum allowable stress refer NORSOK standard L-002.

It is 2.4 times the allowable stress as per B 31.3 & 1.5 times the yield stress.

For trunnion check generally (I don't like this term) but everywhere engineers are using 1.5 times the allowable value. I will still recommend to go with FEA since Caesar-II will not give you proper stress evaluation (for trunnion) as it is based on beam theory.

So better is to go for FEA than any other option.

Regards,
R.K.

Thanks R.K. for your reply.