Technical Requirements for Pressure Vessel Manufacturing (Inspection and Acceptance) – Valuable Contribution of Information

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This post was last edited by kareale88 on 2019-2-16 at 14:52. bg14.jpg Today, the technical requirements for pressure vessel manufacturing are presented; see the table of contents (Word). As usual, replies will be visible, and there are prizes for those who participate. 1. Welded joints are classified into four categories: A, B, C, and D. 2. The materials used to manufacture pressure-bearing components should have recognized factory markings. 3. The thickness δs of the steel material used for cold-rolled sections. 4. Mechanical damage to the surface of the steel plates should be avoided during manufacturing. 4 5. The groove surface must be free from defects such as cracks, delamination, and inclusions. 4 6. The minimum specified value for the standard tensile strength is σb ≥ 540 MPa. 4 7. Misalignment amount for weld joints of types A and B. 4 9. Beveling. 6 10. Misalignment amount b. 6 11. Allowable deviations for the inner diameter of heat exchanger tube boxes, shells, and end caps. 8 12. The length of the tube sections should be no less than 300 mm. 8 13. The flange surface must be perpendicular to the axis of the pipe or tube. 8 14. Holes should be made as far away from welds as possible. 9 15. Grinding of the surface. 9 16. Checking the roundness of the shell: 9 17. Flange processing. 10 18. Welding electrodes, fluxes, and other welding materials. 10 19. Height of the weld beads for joints of types A and B. 11 20. The weld surface must be free from cracks. 11 21. Undercutting is not allowed. 12 22. The welding test pieces for products should undergo heat treatment along with the products themselves. 12 23. Test pieces can be repaired if necessary. 12 24. Length and width of test pieces. 12 25. Welded joints of pressure vessels – delayed cracking, reheat cracking. 14 26. Non-destructive testing methods for pressure vessels. 14 27. Proportion of non-destructive testing for butt weld joints of pressure vessels. 14 28. Full radiographic or ultrasonic testing is required. 14 29. Two pressure gauges must be used for pressure testing. 15 30. Reinforcement rings for openings in pressure vessels. 15 31. Preparations before pressure testing. 15 32. Requirements for the liquid used in testing. 16 33. Requirements for the gases used in testing. 17 34. When conducting a leak test on pressure vessels. 18 35. Marking locations on sheets, pipes (rods). 18 36. Welding electrodes suitable for common steel grades. 19 37. Welding electrodes suitable for welding different steel grades together. 20 38. The diameter of the welding electrode depends mainly on the thickness of the workpiece. 21 39. Preparations before welding. 21 40. Commonly used basic welding electrodes. 22 41. Whether preheating is necessary. 22 42. During welding, arc starting should be done on an arc starting plate or within the groove. 23 43. Multi-layer welding to ensure weld quality. 23 44. The root of fillet welds in pressure-bearing components must be fully welded. 23 45. Welding of austenitic stainless steels (hereinafter referred to as stainless steel). 24 46. Welding wires and fluxes suitable for common steel grades. 25 47. Welding wires and fluxes suitable for welding different steel grades together. 25 48. Fluxes should be dried according to the parameters specified in their instructions. 26 49. Welding of workpieces should be carried out in accordance with the welding specifications outlined in the process documents. 27 50. Submerged arc automatic welding for inner and outer ring welds of cylindrical workpieces. 28 51. For double-sided submerged arc automatic welding, the front side should be welded first. 28 52. Areas to be treated by carbon arc gouging. 29 53. Equipment (power supply). 30 54. Preparations before carbon arc gouging. 32 55. Operations involved in carbon arc gouging. 32 56. Requirements for the gouged groove. 33 57. Tungsten inert gas welding. 33 58. For forgings that require ultrasonic testing, the surface roughness Ra should be 6.3 μm. 36 59. Material inspection. 38 60. Steel plates used for these main pressure-bearing components must be rechecked. 39 61. Inspection of steel pipes 39 62. Inspection of welding materials 39 63. Inspection procedures for pressure vessel manufacturing 41 64. Commonly used welding materials are listed in Table 47. Note: The contents here refer to the general requirements for inspection and acceptance; if the standards cited are not the latest, please refer to the most up-to-date versions for corrections. ....................................................................................... ....................................................................................... For the previous summary of design technical requirements (see the link below): Views: 9720 | Replies: 274 Summary of new technical requirements – Pressure vessels section – Valuable contribution of information. https://bbs.hcbbs.com/thread-2268245-1-1.html ....................................................................................... ....................................................................................... Final voting stage for the 2018 “Top 10 Outstanding Members of Haichuan” – only available via Haichuan’s official WeChat account! For more details, please visit the link below: https://bbs.hcbbs.com/thread-2281360-1-1.html. I am extremely grateful to all the users who support my region – vote for numbers 28, 29, 30, and 31. After voting, there will be drawings for prizes such as laptops, Haichuan cups, phone top-ups, and 100 wealth points... 10 votes = 10 drawing opportunities per day... Hurry up and participate!