Hi there, I have a question about roundness measurements required in a 40.000 m3 storage tank. I have been assigned to follow QC on this job when the 6 courses and top reinforcement angle were already installed. Performing a walkdown on the jobsite, I have noticed lots of local deviations on all the 6 courses and VT of the inside of the Shell from the top, confirmed them. Doing research on the paperwork available, I have found a roundness report up till the third course, where the most relevant radious was +65 mm (25 mm by code).While I was up there doing a VT I have noticed the 2nd course is out of level with respect to the third one in quite few spots. Due to this matter, I have asked the contractor to perform roundness checks on all the 3 last courses,and check for plumbness as well. Contractor says, there is no where in the API 650 code where it states that those measurements have to be taken in all 6 courses, which is true, but since my concern about the quality of their work, my question is if API 650 back me up in any paragraph (havent found any) to have them do that if the main concern is to know how round and vertical the tank is at this point?
Any info will be appreciatted.