Welcome to the aboveground storage tank forum, a bulletin board dedicated to tanks, fuel tanks, plastic tanks, fuel storage tanks, and above ground storage tanks (AST) API650, API653 & UL142 aboveground storage tanks (AST) and chemical plastic tanks. Remember the forum is made up of volunteers from experts to beginners. Unfortunately, we cannot allow free commercialism that promotes products, services, or sites.
BABRTs 973 on Weld passes of bottom plateBy: BABRTs 973 
Date: Thursday, March 10, 2011
Time: 11:46:35 AM
I read the question to mean the floor plates. However I cannot find in the standard where two pass is required for either the floor plates or the corner weld. API 650 220.127.116.11 gives the fillet weld sizes.
Published on ast-forum.com