Storage Tank Designed to API 620 vs API 650 1

[NDEngforum]

Please I need clarifications on the major differences between storage tanks designed to API 620 and that designed to API 650 and scenarios where each can be selected.

Thanks.

 

[JStephen]

Generally, if a tank falls under the scope of API-650, it would be preferable to design to that standard. That would include a flat-bottom cylindrical tank with pressure not over 2.5 psi.

 

[MJCronin]

I believe that this has been discussed before on the eng-tips forum and others....

Have you seen any of these ?

http://www.eng-tips.com/viewthread.cfm?qid=288436

http://www.ast-forum.com/ast_forum_tree.asp?master=15277

http://www.ndt.net/forum/thread.php?&rootID=36361