1. China Non standard cylinder is cast, and after leaving the factory, China Non standard cylinder must undergo aging treatment, so that the internal stress generated by China Non standard cylinder during the casting process can be completely eliminated. If the aging time is short, the processed China Non standard cylinder will be deformed in the future operation.

2. China Non standard cylinder is subjected to very complicated stress during operation. In addition to the static load such as the pressure difference between the inside and outside of the China Non standard cylinder and the weight of the parts installed in it, it also bears the impact of steam flowing out of the stator blades. The reaction force of the static part and the action force on the China Non standard cylinder under the hot and cold conditions of various connecting pipes, under the interaction of these forces, the China Non standard cylinder is prone to plastic deformation and leakage.

3. The load of China Non standard cylinder increases or decreases too fast, especially when the temperature changes greatly during rapid start-up, shutdown and working conditions, the way of warming the cylinder is incorrect, and the insulation layer is opened too early when the machine is shut down for maintenance. In the cylinder and on the flange, great thermal stress and thermal deformation are generated.