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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 650 188.8.131.52 gives the fillet weld sizes.
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