(1) Material substitution. In practice, the common material replacement problems of pressure vessels mainly have two aspects: to better and worse. That is to say, the material of the pressure vessel is replaced by a higher-grade and better-performance material, and the material with lower performance and poor performance is not preferable, and the safety of the pressure vessel is not necessarily beneficial; That is, in terms of material selection of the pressure vessel, it is simple to replace the thinner material with a thicker material of the same steel grade, so that the plane stress state will be changed to the plane strain state under the force of the casing. It is more harmful.
(2) Deformation occurred. The deformation occurred during the manufacturing process of the pressure vessel, and the first is the error in the size of the blank. That is, at the time of manufacture, the size of the blank of a certain component is not accurate, does not meet the specifications of the design standard, causing deformation, directly affecting the overall safety performance of the pressure vessel; second, the size of the mold does not meet the standard requirements or the operation is not standardized, thus causing pressure The deformation of the container; the third is that when the pressure vessel is assembled, the error is too large or there is a misalignment, resulting in different degrees of deformation of the pressure vessel. The deformation of the pressure vessel reduces its tightness and reliability, which inevitably affects safety.
(3) Welding defects. The quality of the pressure vessel welding directly affects its function and safety. However, in practice, no matter which type of pressure vessel is welded, it is impossible to be perfect.
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