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After having all the comments, replacing the tank seems better option rather investing in coating for a short term.

@MJCronin: not yet as will do in particular after the third party inspection report. Regarding coating what do you suggest as per your experience epoxy will be good or we can go for glass coating as well?

@shvet: Yep 50 c is the bulk temperature of the liquid and its a commercial grade of caustic. May be the electrical tracing could be beneficial. Thanks for the CSB link. Tank in our case is atmospheric. I think better to have AE testing in combination with UT during upcoming inspection.

@shvet, @r6155 & @GD2: Thanks for further suggestions buddies.

@SHVET: Thanks for providing reference of NACE SP0403

I really appreciate your response and thanks for the guidance [thanks]. Surely, I'll update the final decision once made.

@MJCornin: You got it right regarding the task given by the boss "make it work :)" It's very old tank so I cant say either it was designed particularly for caustic or some other service as the GA drawing is not having any service mentioned on it. Working is in progress for a trade off between...

@LittleInch: Totally agreed with the point of have proper mapping of the corroded areas. I'm trying to look in to previous reports but I think the inspector didn't submit the detailed map. Waiting for the shut down to have detailed internal inspection. Thanks buddy! @shvet: Just UT performed...

Hi Buddies, We are having a CS Horizontal Atmospheric Tank (SA 510 Gr. 60) built in 1966 resting on two saddle supports. Material thickness is 6.35mm having no corrosion allowance. The ID is 2425.7mm and the service is NaOH. t(required) is calculated as 3mm. Based on the UT inspection report...