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Caustic Tank (21%) Temperature Hick-Up

Caustic Tank (21%) Temperature Hick-Up

Caustic Tank (21%) Temperature Hick-Up

(OP)
I have a 22' diameter x 15'ht carbon steel (A36) tank.   It operates at ambient (85oF) temperature under normal conditions.  Built 2002 to API 650 standards with acceptable QA/QC records.  Shell plate chemical composition: C=0.18, Mn=0.75, P=0.01,S=0.006, CU=0.02, Al=0.038. Current thickness measurements on the shell, roof & nozzle are at or near nominal thicknesses.

Over the weekend it was hit with 180oF for 48 hrs.

Our concern is do we have corrosion and or cracking potential.   

RE: Caustic Tank (21%) Temperature Hick-Up

Your probability for Caustic Stress Corr Cracking went up a minute amount.  Very, very small amount.  

On your 10-year 1st Internal, be sure to perform 100% MT on all welds below 6 to 8-ft up.

RE: Caustic Tank (21%) Temperature Hick-Up

(OP)
Duwe6 thanks for your comments.  Did you base your decision from a time factor of exposure (48 hrs),temperature or % of caustic?  

RE: Caustic Tank (21%) Temperature Hick-Up

The answer is "E" -- all of the above.  Mostly being a fairly low concentration and the very, very short duration.

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