Hi unclebensrice
1. PROJECTION OF THE BOTTOM
An inspector should always review the inspection/construction/maintenance records.
Has the tank been operating this way without problems during some time? Repairs not always needed. Compare to the Annex B of API 653 to check if repairs are recommended by the standard.
Buckling of bottom plates in the perimeter of the tank can be due to weld distorion as HTURKAK says or due to overpressure in the tank. The roof of the tank is gas-tight?
If it is weld distortion, there isn´t much trouble but water accumulation. Can you fill with something without sealing the bottom-foundation gap? But if you really don´t want problems, you should repair that. It implies removing the weld and rewelding using stiffeners to avoid deformation of the projection.
2. NOZZLE MISALIGNMENT
This is a big problem. If you say this, I get it that the tank is new.
Do you need to realign the neck? Remove the former shell-neck without damaging the shell, this is important, then weld a new assembly making any NDT you can and feel comfortable with. Depending on nozzle size, a test that serves as a proxy for an hydrostatic test will be needed. Build a rig to hydrostatically test only the nozzle including the neck.
Do you need to realign the flange? Remove the flange-neck weld and weld a new nozzle making any NDT you can and feel comfortable with. Build a rig to hydrostatically test only the nozzle.
Thanks
Carlos Molina
apiexam
apiexam.com
