Deformation of anti-corrosion pipe bundles
Thread Content
It’s happened several times now: the tube bundle of the floating head heat exchanger is prepared properly (with no issues regarding parallelism), and anti-corrosion treatment using SHY-99 or TH901 is carried out by the anti-corrosion manufacturer. However, after delivery, the tube bundle suffers severe deformation. I would like to know what causes this deformation. Does anyone know?
Is there stress in welding, and deformation due to thermal expansion and contraction?
It is not welding deformation; it is the deformation resulting from the anti-corrosion treatment of the heat exchanger tube bundle. Furthermore, how does welding the pipe ends affect horizontal deformation?
To prevent deformation of the tube bundle caused by lifting during the anti-corrosion process, it is recommended to increase the stiffness of the tube bundle or to ask the anti-corrosion manufacturer to use special fixtures during lifting in order to avoid such deformation. Personal opinion, for reference only.
I personally don’t think the deformation was caused by the lifting process. The tube bundle of the Bes500 model has a length of 6 meters, with baffle spacing of 200 mm; therefore, not much deformation should occur during lifting. In reality, however, the tube bundle, after being brought back from the anti-corrosion factory, cannot be installed inside the cylinder. Before anti-corrosion treatment, we conducted a hydraulic test on the pipe ends, and the tube bundle was installed in the cylinder smoothly. I suspect the deformation was caused by the baking step in the restraint anti-corrosion process. This question needs to be answered by professionals from anti-corrosion manufacturers
There is such a possibility~~ The reason for this problem is that the gap between the outer dimensions of the tube bundle baffle and the cylinder is too small; even a slight deformation can lead to installation difficulties