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Bottom Repair of Water Fixed Roof Tank

Inchtain

Petroleum
Feb 21, 2021
142
Hello,

I would like to know if it is allowed/recommended to leave the weld build-up of limited pits of the Tank Bottoms or they shall be ground smooth? Which is better? and Is Visual and Dye Penetrant Examinations are enough for their inspection?

Thanks
 
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Usually, grind smooth for coating, not flush. Test with vacuum box or equivalent. If it's an API-650 tank, refer to API-653 for requirements.
 
My interpretation of API 653 is ,
-There are some limitations if the weld repair is within the critical zone,
-The weld repairs shall be ground flush with the surrounding plate material and be examined with visual inspection and PT/VB.
 

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