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to IFRs: I guess it relates to requirements of weld spacing, refer to Figure 5.6

I read through API 653 section 4.4 (Tank bottom evaluation) Just need a confirmation from the expert: With tank contain water which SG=1.0, (assuming Stress<27,000PSI, and thickness 1st shell course<0.75)for minimum thickness require for annular plates ring will be 0.236in (~6mm) and we do not...

So if the thickness at that area is not satisfactory then what can we do to repair to bring back the tank in service? replace the annular?

To HTURKAK: in case you cannot use patch-plate due to maximum 24in in length for tombstone plate at critical zone. To IFRs: I agree we shall follow the code API653 cutting 1/2in above corner weld, however if we do it when sectional replace, the tank shell will short a distance because the cut...

Hi, I have a question regarding replacement annular plate with API 653 My understanding: when replace and remove an entire existing tank bottom, the tank shell shall be separated form tank bottom minimum 1/2in above the bottom-to-shell weld (line B-B in Fig.10.1) How about when replace only 1...

Hi all, During some round inspection on gasoline tank: few scabs (built-up) product with weeping mark were observed on lap-weld shell seam. The tank is empty now. We conducted close-up visual inspection conjunction with NDT MPI, there was evident of weep hole on corrosion weld with product...