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Since I have not been to the site to examine the pipe racks, I am not very familiar with them. However, the pipe racks are mentioned frequently in the design, and without any on-site photos for reference, it is difficult to understand them. There are a few questions regarding displacement. By displacement, does it refer to the physical, visible movement of the pipe in its original position, or does it refer to the increase in length and diameter of the pipe due to thermal expansion and contraction? If it refers to the changes caused by thermal expansion and contraction, then how can a fixed bracket control its axial lengthening and shortening due to these effects? It mentions a sliding bracket, which means it can move in any direction. I’m a bit confused – does this movement refer to the tube being able to move freely? Can the position change however it wants? Are there positions of the pipes on-site where significant changes can occur, or does it refer to the fact that when they expand due to heat or contract due to cold, the pipes can change in both axial and radial directions? Are those pipes that are directly mounted on the pipe tray, serving only to bear weight without any other restraining devices, considered sliding supports? What is the relationship between load-bearing brackets and fixing brackets, sliding brackets, and guide brackets? Thank you all. It would be great to have some photos from the scene for reference