Common questions for spherical tank defense presentations

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1. What are the main features of spherical storage tanks? 2. What are the regulations in the Code of Practice regarding the filling coefficient for tanks storing liquefied petroleum gas? 3. How many types are there for the shell plate structural format? What are their respective advantages and disadvantages? 4. How is the filling height of a spherical tank calculated? 5. What loads should be considered in the design of spherical tanks? 6. How to calculate the thickness of a spherical shell? 7. What factors should be considered for steel plates used in spherical tanks? 8. What are the common steel plates used for spherical tanks? 9. Under what circumstances should steel plates for spherical tanks be ultrasonically inspected one by one? 10. What are the advantages and disadvantages of using equatorial tangent column-type supports for spherical tanks? 11. What is the connection structure at the junction between the support columns and the spherical shell? 12. What factors should be considered in the design of a pillar structure? 13. Under what circumstances should a water spray system be installed on spherical tanks? 14. What are the regulations regarding the installation of safety valves on spherical tanks? 15. What is the method for shaping shell plates? 16. What is the method for cutting shell plates? 17. Why must the assembly welding of the upper section of segmented supports and the equatorial plate be carried out at the manufacturing unit? What are the quality control requirements after such assembly welding? 18. Under what circumstances must hydrogen removal treatment be performed immediately after welding spherical shell seams? 19. Which spherical tanks require a tightness test? 20. What are the requirements regarding foundation settlement during a hydraulic test? 21. What key points should be considered in the design of shell plates? 22. What is the function of the tie rod? 23. What is the purpose of post-weld heat treatment for spherical tanks? Which spherical tanks should undergo overall post-weld heat treatment? 24. When a spherical tank is not subjected to overall heat treatment, which welded assemblies must undergo post-weld heat treatment? 25. What are the special requirements for steel plates used in spherical tanks with a shell thickness greater than 50 mm? 26. Why are integrally forged pieces used for reinforcing the nozzles and manholes of spherical tanks? 27. What requirements should be set for the connections between the columns and the bottom plate, as well as between the columns and the tie rods, during the installation of spherical tanks? 28. Why is it necessary to specify the maximum and minimum design temperatures for spherical tanks? 29. Is welding done inside the U-shaped plate? 30. What are the requirements for the two safety valves on a spherical tank? GB150 specifies one high and one low temperature level. 31. Since the activation of the safety valve causes local low temperatures, is it necessary to use materials suitable for low temperatures in spherical tanks? 32. Is a Class A3 certificate required for shell plate manufacturing? 33. What are the possible failures of spherical tanks? 34. Is splicing allowed for spherical shell plates? Why? 35. What is the difference in the forces acting on the upper and lower supports of a spherical tank? 36. Why are two manholes required on a spherical tank? Can we open one? 37. How is heat treatment performed on spherical tanks? 38. What is the optimal height for the spherical tank tie rods – higher or lower? 39. How is heat treatment carried out for spheres and tanks? Draw the bolt holes on the base plate and their orientation. 40. What are the methods of heat treatment for spherical tanks? Is there any displacement of the supports during heat treatment? How should the holes be made in the base plate? 41. What is the mechanical model of the supports for spherical tanks? And describe the constraint conditions at both ends of the pillar. 42. How is the settlement of spherical tanks detected? What should be done if there is uneven settlement? 43. How are the calculations for spherical tank supports addressed in the standards? Is tensile stress or compressive stress being calculated? Based on the actual stress conditions, is the pillar under tensile stress? How is tensile stress generated? Why are tensile stresses not considered in the standards? 44. What is the mechanical model of the spherical tank support? And describe the constraint conditions at both ends of the pillar.