1. Identification and inspection of raw materials
2. Approval of the welding process completed on the test plate
3. Examination of welders' qualifications
4. Welding groove preparation, involving visual inspection of layering and penetration flaw detection
5. Verification of the quality of welding preparation and welding seam pairing
6. Examination of welded joints on the back of the groove, such as the welds of the placement type takeover, due to inconvenience in these areas
7. Radiographic inspection
8. Penetrant flaw detection for cover layers; testing of the chemical composition of cover layers; measurement of ferrite content
9. Alignment of longitudinal welds and girth welds
10. Size deviation assessment of a single barrel section
11. Pair inspection of a barrel section and parts
12. Gap measurement of the root bead before welding
13. Assessment of the appearance contours of welding seams and identification of welding defects
14. Inspection of prefabricated parts and purchased components
15. Verification of radiographic inspection or other welding inspection techniques
16. Determination of the thinning amount of the head after molding
17. Checking the alignment of the tube plate and the shell after drilling
18. Verification of the pairing of the tube sheet and the shell before welding operation
19. On-site witnessing after post-weld heat treatment
20. Dimensional inspection following a hydraulic test
21. Issuance of container stamps and certificates of conformity
22. Packaging and shipping