Will someone please tell me what is the exact function the annular ring under the tank shell. According to API 650 sect 5.5 an annular ring is soley dependant on the stress in the bottom course. According to BS 2654 a tank over 12.5m dia must have an annular ring. I would like to know why the annular is necessary? Because butt welded the completely flat and even surface makes the shell to bottom weld much stronger but there must be more. Please assist.
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