Clean out door stress relief
Clean out door stress relief
(OP)
We have a fixed roof tank with a flush type clean out door, which is required to be stress relieved in accordance with API 650.
The problem is that the tank fabricator installed the door into the tank without completing all the welds, but stress relieving was however performed on the incomplete section. Now I believe we have to apply another round of stress relieving after the completion final welds on site.
Thermal stress relieving is impractical at the project site, would it be possible to satisfy API 650 by applying acoustic / vibrating stress relieving?
Any suggestions to save this without having to replace the clean out door section?
Thanks
The problem is that the tank fabricator installed the door into the tank without completing all the welds, but stress relieving was however performed on the incomplete section. Now I believe we have to apply another round of stress relieving after the completion final welds on site.
Thermal stress relieving is impractical at the project site, would it be possible to satisfy API 650 by applying acoustic / vibrating stress relieving?
Any suggestions to save this without having to replace the clean out door section?
Thanks





RE: Clean out door stress relief
Check if App. A has any exemptions applicable to the tank.
RE: Clean out door stress relief
Joe Tank
RE: Clean out door stress relief
We cannot use Appendix A due to the nozzle neck of 20mm and the floor insert of 40mm, I am not familiar with the design to know why the neck is so thick.
The fabricator did not want to install the prefab section due to fears of peaking and banding. There are some serious QA/QC issues, as the QCP was set up correctly, but implemented incorrectly.
RE: Clean out door stress relief
Joe Tank
RE: Clean out door stress relief
Any comments on the vibration stress relieving?
RE: Clean out door stress relief
Joe Tank