Questions for the drawing defense in the training and assessment course for pressure vessel design approvers

Thread Content

I’ve compiled some questions regarding training and assessment courses; experts are welcome to answer them in their free time so that everyone can learn from it. Thank you. 1. The impact on calculations before and after heater corrosion. Why is it necessary to perform calculations before corrosion? 2. When is it necessary to add expansion joints in the calculation of the fixed tube sheet of a heat exchanger? 3. How are heat exchangers classified? Are the shell side and tube side both designed and manufactured according to the highest category of the vessel? 4. How is the design life of a heat exchanger determined? Do all components of the entire device need to meet the requirements for this design life? 5. What is the difference between the calculation model for the tube sheet of a fixed-tube-sheet heat exchanger and that of a U-type heat exchanger? 6. How to consider seismic loads for heat exchangers. 7. What are the characteristics of the shell of a U-tube heat exchanger? 8. What is the difference in the calculation of the shell and tube flanges of U-tube heat exchangers compared to the calculation of ordinary flanges? 9. Characteristics of various types of heat exchangers and precautions for hydrostatic testing. 10. Briefly describe the pressure testing procedure for heat exchangers, and why ammonia is used to detect leaks after testing the shell side and tube side. 11. Which types of stresses need to be considered for the skirt of a tower-type container, and what operating conditions should be taken into account? 12. What are high vibration modes, and when are they need to be considered? How to superimpose high vibration modes. 13. What is the computational model for earthquakes? 14. Besides internal pressure stress, what other stresses must be considered for towers, and how can they be controlled? 15. How is the value 40 (min39.7) indicated on the end cap determined, and how is the minimum forming thickness calculated? 16. How to install the insulation ring on the tower, why it is installed, and its exact location. 17. Where does the damping coefficient of 0.01 for the tower come from, and why is this value chosen? Is it better to have a high damping coefficient or a low one? 18. Why is a conical skirt used? 19. Precautions regarding water pressure during tower maintenance. 20. What considerations should be taken in the design of a full-level tower? 21. How to address the flattening phenomenon of horizontal containers in design. 22. Characteristics of the saddle position setting for horizontal containers, and which end is used as the fixed end. 23. Definitions and relationships of minimum thickness, nominal thickness, calculated thickness, and effective thickness. 24. Requirements of GB150 regarding low-temperature impact energy. Why is the impact energy shown on the drawings higher than the impact energy requirement specified in GB150? (The impact energy given on the drawings is in accordance with GB713). 25. Difference between welds and welded joints. 26. What is the purpose of a risk assessment report, what contents does it include, and how should it be written? 27. What failure modes does GB150 consider, and what measures does the standard take to prevent them? 28. There are several forms of strength failure. 29. How to classify multi-layer containers. 30. Advantages and disadvantages of multi-layer containers and single-layer containers. 31. Stress distribution in the inner cylinder of the heat-tightening container, stress distribution in the outer cylinder. 32. Why is post-weld heat treatment carried out by taking the material out at 400°C, and not at 500°C? 33. What are the standard materials for pressure vessels at atmospheric pressure? 34. Explain the steps of Fran’s design process. 35. When to use three-stage forgings. 36. Calculation of safety valves. 37. After the safety valve has undergone a leak test, is it necessary to adjust its set pressure? 38. What are the coordination standards for 30m3 liquid carbon dioxide storage tanks? Which reference standards exist, and which of them are mandatory? 39. Calculation of the diameter of process pipe openings such as safety valves. 40. What are the issues in the chart curve of the compressed gas system coefficient for safety valve calculations that require correction? 41. When should a safety valve be installed on a pipeline and when should it be connected directly to a pipe outlet? On which type of outlet should it be placed? What are the differences between these two installation methods and the causes of overpressure? 42. Why are safety valves installed on pipelines, and not on the equipment? 43. Forms and characteristics of high-pressure seals, and drawing of the sealing structure of a biconical ring. 44. What are the characteristics of high-pressure bolts? Why are high-pressure bolts equipped with fine threads? 45. What factors should be considered in the design of high-temperature and high-pressure hydrogen-containing vessels? 46. Structural characteristics of high-pressure vessels. 47. What are the characteristics of the three-dimensional stress distribution in high-pressure vessels? 48. What are the types of high-pressure vessel shells, and which one possesses self-reinforcing properties? 49. Do welded containers require welding test plates? If so, how should these test plates be prepared? 50. What is the difference between WRC107 and WRC297? Can perforated fittings on the cylinder use WRC107? 51. What are the principles of hydrogen embrittlement and hydrogen corrosion, and how can they be prevented? 52. What are the four forms of damage caused by hydrogen sulfide corrosion, what are their characteristics, and how can it be prevented? 53. What is MAWP, and how is MAWP calculated? 54. How to determine the minimum design metal temperature. 55. How is the design pressure considered? 56. How is the size of the process pipe connection determined, and how can one know if the pipe diameter specified by the process is appropriate? 57. Why is the φ25*2 specification chosen for the heat exchange tubes? 58. Why control P and S contents? 59. What tests are used for the pickling and passivation of stainless steel, and what are the testing standards for the blue spot method? 60. What are the differences in the calculations for socketed fittings and inserted fittings? What are the structural advantages of socketed fittings, and what should be taken into consideration? 61. Stress characteristics of EHA heads. 62. What tests are required for fittings with DN≤250? 63. How should Class E welds be treated? 64. In radiographic testing, what is the basis for classifying A, AB, and B, and which one is the strictest? 65. There are several types of heat treatment; when heat treatment is carried out, the definition of heat treatment depth and its functions.