On my current project, the client has asked us to brace ALL header branches less than 2" NPS per NORSOK L-CR-003 regardless of rating.

With reference to MTD Pub. 99/100 " Guidelines for the Avoidance of Vibration Induced Fatique in Process Pipework", the copyright of the original Guidelines was transferred to the Energy Institute and the Guidelines have been re-written to increse the scope and be much more user friendly. The final draft is out for review now with publication scheduled near the end of the year (I'm told).