What is the Expansion Joint of The Bellows Compensator? What are the Applications?

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Bellows compensator expansion joints have been widely used in many industries. In addition to considering good compensation capabilities, reliability is the key to bellows compensator expansion joints. However, reliability is guaranteed by multiple links such as design and manufacturing. The negligence of any link will shorten the life of the compensator or even fail.

Most manufacturers of bellows compensator expansion joints have analyzed the reasons for the failure of bellows expansion joints and found that the failure of bellows expansion joints during operation mainly includes corrosion, leakage and instability deformation, of which corrosion failure accounts for the vast majority. Through the analysis of the corrosion failure of the bellows, it is found that the corrosion failure usually includes pitting corrosion and stress corrosion cracking, of which chloride stress corrosion cracking accounts for 95% of the total corrosion failure. Therefore, reasonable selection of the material and structure of the bellows, reasonable design of the wave parameters and fatigue life of the bellows, and ensuring the installation quality of the bellows can greatly improve the safety and reliability of the expansion joint of the bellows compensator.

The stability of the metal bellows should be considered in the design to prevent the instability of the bellows. The results show that the compensation of the bellows depends on the fatigue life of the bellows. The higher the fatigue life, the smaller the single-wave compensation of the bellows. In order to reduce costs and increase single-wave compensation, the lower the allowable fatigue life of the bellows, the greater the radial bending stress caused by the displacement and the higher the comprehensive stress, which greatly reduces the stability of the bellows. When the allowable life of the bellows is low, not only the meridional comprehensive stress is high, but also the circumferential stress is high, which causes the bellows to quickly enter into plastic deformation, resulting in instability and damage of the bellows.

In addition to design, the selection of bellows hose is also very important. In addition to considering the working medium, working temperature and external environment, the choice of bellows material should also consider the possibility of stress corrosion, the influence of water treatment agents and pipeline cleaning agents on the material. On this basis, combined with the welding, forming and performance-price ratio of the bellows material, a practical bellows material that meets the working conditions is selected.

The selection of bellows should meet the following conditions: 1. Good plasticity, easy processing and forming of bellows, and subsequent processing (cold work hardening, heat treatment, etc.) to obtain sufficient hardness and strength. 2. High elasticity, high tensile strength and fatigue strength, to ensure the normal operation of the bellows. 3. The welding performance is good, and the metal bellows manufacturer can meet the welding process requirements of the bellows in the production process. 4. Good corrosion resistance, which can meet the working requirements of metal bellows in different environments.

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