Superpiper,

I really suggest you look into the trunnion model info in CAESAR II its method is based on FEA work by Stone & Webster as I recall some time ago.

This method will cause you to increase the SIFS on your elbows, insert actual trunnion pipe elements with associated SIFs into your model.

Tell your reviewers if they question what you have done its based upon comercial software which was based upon an ASME paper .... and so on.