Would it be acceptable to have 1/2" threaded couplings, nipples, and valves installed on a 193' dia, 48' high AST built in 1979, API 650, 6th edition, revision 2, material A-36, and A283-c. The existing coupling/nipples/valves are 1". Table 5-8 of 650 10th edition indicated 3/4" -2". Any help...
When performing an internal on a tank floor on areas that have been scanned by the magnetic flux leakage (or exclusion) process, do you use the Tmin of one plate, or lowest averaged recording of the floor to try to establish a 20 y/r interval?
