Bottom Repair of Water Fixed Roof Tank

[Inchtain]

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

 

[JStephen]

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.

 

[HTURKAK]

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.