Section 9.3.2.1 of API 653 prohibits any lap patches on the shell for shell thicknesses greater than 1/2". I am trying to understand why because a co worker of mine thinks it will solve our issues but there would be a reason API 653 prohibits it. I do not have to follow API 653 but i have to...
JStephen,
That would be helpful, but the criticality of this tank does not allow easy removal from service to allow for an inspection inside. I have been asked to collect more external UT data to develop the scope of the repair. It was design to store black liquor Sg=1.3. We don't have...
Hello everyone. I have a 800,000 gal storage tank that has experienced significant external corrosion for about 30 ft of the circumference (soil build up on tank, poor housekeeping).
I have also found that the floor to shell weld has started to corrode for a wider range of 61ft give or take...
Ed, can you explain what the derate cause might be, if 309 has a higher tensile strength than the base material (212b)?
Andrew, im not super familiar with corrosion causes. If the base metal is not below tmin and we do an overlay, would the thickness tend to stay the same over the years as it...
I am planning the overlay of 2 shell courses in a continuous digester. My boss and I are in disagreement over how we can treat the added thickness from the 309L overlay. He believes that we do not need to do any base metal restoration BEFORE the overlay while I believe we cannot use the...
