Tank shell dent - repair or not?
Tank shell dent - repair or not?
(OP)
We recently noticed a dent in the 2nd to top shell course of one of our tanks. The 6" gooseneck screen was plugged so I assume the tank was exposed to vacuum recently. The question is, is there anything required to do to this tank now that the shell has a dent in it? I cannot find anything in API653 about repairing a "dented" or "deformed" shell plate. I realize there will be a slight loss of volume, but the tank is not normally filled to full capacity. Do the welds around the deformation need any type of inspection? Please see the attached photo.





RE: Tank shell dent - repair or not?
I'm wondering to what extent the dent would pop back out if the tank were filled full.
RE: Tank shell dent - repair or not?
RE: Tank shell dent - repair or not?
There are going to be concerns about the transition point between the undented and dented tank wall. As a minimum, I would be looking to MP the edge of the dent.
I've done this type of evaluation before. For a single dent, it's pretty straight forward. I've also evaluated tanks where 75% of the upper 3 courses had dents/wrinkles due to pulling a vacuum. That required a Level 3 assessment...
RE: Tank shell dent - repair or not?