Metallic bellows are a type of compensating element that utilizes the effective expansion and contraction deformation of its main bellows to absorb size changes in pipelines, conduits, containers, etc., caused by thermal expansion and contraction and other factors.

Metallic bellows should be replaced with new ones once they reach their service life, as their material may experience different degrees of aging, oxidation, or fatigue, making continued use inadvisable.

Based on the original documentation, identify the model, pressure, connection method, and compensation amount of the metal bellows, and determine the actual total installation length.

If no original documentation is available, in such cases, it is necessary to determine the conveying medium, design pressure, and total length of the metal bellows, and provide photographs to the metal bellows manufacturer. If the compensation amount of the metal bellows cannot be ascertained, the temperature of the conveying medium and the distance between the midpoint of the two metal bellows must be provided.