Cracks on the outside of the heat exchanger tube plate bolt hole
Thread Content
In the vertical fixed tubesheet heat exchanger, a total of 3 cracks were found in the bolt holes of the tubesheet. The situation is as shown in the picture. What is the general cause of this and what is the most appropriate solution?
Hello, is it possible that the stress change is caused by the different expansion coefficients of the tube sheet and the bolts?
It is estimated that the design of the tube sheet is thin. The temperature difference stress and material selection cause the expansion amount of the cylinder and the heat exchange tube to be too large. The tube sheet deforms too much toward the shell side. The sealing surface in the picture seems to have leaked during operation. Solution: Redesign according to the most severe working conditions, add expansion joints or thicken the tube sheet.