API 650 11th Edition Addendum 2

Addendum 2 to API 650 11th Edition has been released. The effective date for this addendum is May 1, 2010. I will give just a brief overview of some of the bigger changes. I will do a more complete review later. First, they have changed Tables 5-6a and 5-6b and revised the minimum distance from the bottom of the tank to the center of a nozzle for regular type fittings. Snow load requirements have changed such that you now will have to consider both balanced and unbalanced snow loads. In Appendix V that have changed the stability factor such that there are different values depending upon certain conditions. The one that surprised me the most is that they slipped in Appendix Y. This was added after the proof copies were sent out. Appendix Y has added back into the standard the API monogram system. It appears that you can now place the API monogram on a tank nameplate if you have been certified to do so. You may find in the future that some companies will require this certification to be able to bid on and build their tanks. It will be something to watch out for.