API 650 11TH EDITION APPENDIX V
API 650 11TH EDITION APPENDIX V
(OP)
Has anyone else had problems with unstiffened shell section of appendix V? We have a tank that passes due to wind with no indermediate stiffeners but when appendix V is applied it no longer passes for just the wind "W". Also the thicker the top shell course gets the more HTS becomes which increases the min shell thickness. Any explainations you guys could give?





RE: API 650 11TH EDITION APPENDIX V
Secondly, note that you can reduce the factor of safety under certain conditions.
RE: API 650 11TH EDITION APPENDIX V
Do you know why they calculate a different wind pressure in appendix V that is greater than than the wind pressure calculated fore section 5?
So you have not run into anything wrong with these equations?
This is a stainless steel tank so any shell thickness increass is $$$$.
RE: API 650 11TH EDITION APPENDIX V
The increased $$$$ for a properly designed stainless steel tank is but a fraction of the $$$$ to fix or replace a vacuum damaged tank.
The Section 5 wind forces include a drag coeffioient of 0.6 for wind loads on projected area of the tank sidewall. The Appendix V method uses a coeffiecient of 1.0.
Joe Tank
RE: API 650 11TH EDITION APPENDIX V
Very true about the money, which is why we are trying to figure this out since it does not make since to us.
Do you know why Appendix V uses 1.0 instead of .6?
It just doesn't seem logical for it to not need an intermidate wind girder for wind in section 5 but does need one (or more) for appendix V for wind alone not even including external pressure yet. Thats using FOS of 2 too.
Also, does it make since that the thinner the top shell course is the lower tsmin becomes per appendix V?
RE: API 650 11TH EDITION APPENDIX V
Joe Tank