(L) Carry out ultrasonic flaw detection (UT) on the inner cylinder ring and longitudinal welds and penetrant flaw detection (PT) on the inner surface of the inner cylinder ring and longitudinal welds.
① Mainly for the repaired part of the butt weld of the inner cylinder and the T-shaped weld. The detection ratio of UT and PT shall be randomly checked according to the ratio of 20% of the length of the butt weld; when the cause of the problem is still not found in the above-mentioned flaw detection, the ratio of detection of UT and PT of the butt weld shall be increased to 100%;
②Perform more than 20% UT and PT spot checks on the base metal itself, especially the key suspected parts considered by the inspector after the original data review; in addition, the inspector can increase the flaw detection ratio according to the actual situation of the on-site inspection.
(2) Perform 20% ultrasonic inspection (UT) on the butt weld of the outer cylinder, and 20% magnetic particle inspection (MT) on the outer surface of the butt weld of the outer cylinder; it shall include all T-welded seams and original parts of the outer cylinder. Defects in the weld of the outer cylinder in the data record.
(3) Carry out the inner cylinder hydraulic test according to the manufacturing requirements mentioned above, the test pressure is 1.25 times the design pressure; the inner cylinder airtight test, the test pressure is the design pressure; the jacket air pressure test, the test pressure is 0.2MPa, and the test pressure is 0.2MPa. Pressure 4h; helium leak test; vacuum test and evaporation rate test.
