[Discussion Thread 39] The value of ≤10 at the air barrier and the determination of gap c
Thread Content
bg4.png 【Discussion Thread 39】The value of ≤10 at the gas barrier ring and the determination of gap c: 1. In the diagram of the gas barrier ring, what does it mean by the two values of ≤10, and where is the welding area? 2. How is the gap c determined? Where can I find the average linear expansion coefficient, and how is it calculated? Is the medium temperature here based on the maximum operating temperature? What is a typical value for the gap c based on experience?
≤10 refers to the distance from the tip of the inner diameter of the gas barrier ring to the outer surface of the head. What is a weld joint? The linear expansion coefficient is taken from Appendix 150.2; ASME Volume D was not consulted. The highest value is used for high temperatures, while the lowest value is used for low temperatures. There are many factors that influence this; the result varies from case to case, and there’s no set rule or experience to follow.
Where are the welding points, that is, the areas where welding takes place in Figures 6 and 7?
10 should be the distance from the upper tip inside the gas barrier ring to the tangent of the head； The gas barrier ring is welded to the inner diameter of the skirt; it is fabricated after the skirt and the container have been welded together, and the only welding point then is the fillet weld at the lower corner where the gas barrier ring meets the skirt. Based on the information from one column in our company’s workshop, I’m not sure if it’s correct; we manufacture few columns: lol
How is the detachable part welded: handshake
The standard specifies either detachable or welded types. The gas barrier ring of that previous tower was welded to the skirt
After much thought, it is correct to weld it to the non-compressed components. Is the skirt not considered a compression member?
Detailed calculation methods and tables for the gap c value in HG20652-1998
1, ≤10 refers to the distance from the inner diameter of the gas barrier ring to the outer surface of the head. The gas barrier ring is welded to the inner wall 2 of the skirt; the gap C can be selected according to SH/3098, clause 19. The linear expansion coefficient is based on GB150, Appendix B.14