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April 22, 2025

Why does the bellow expansion joint experience pull-off phenomenon?

The reasons for the pull-off phenomenon of Bellows Type Expansion Joint mainly include the following aspects:
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  1. Improper arrangement of fixed supports: During installation and use, if fixed supports are not installed, or if they are pulled apart, or if their load-bearing capacity is insufficient, excessive deformation of the compensator may occur under pressure, ultimately leading to the pull-off phenomenon.

  2. Inadequate adjustment of pull rod devices: After installation, the pull rod devices that come with stainless steel bellows compensators need to be adjusted within their compensation range. If they are not properly adjusted, the compensator may extend indefinitely under pressure and impact forces until it reaches its limit, resulting in pull-off.

  3. Residual stress caused by cold working: Cold working of stainless steel Bellow Expansion Joints can leave residual stresses in the material, which are highly detrimental to the material's resistance to stress corrosion cracking and increase the risk of pull-off.

  4. Restriction on pipeline contraction: When the hot medium stops operating, pipeline contraction is restricted, causing the compensator to be damaged by being pulled.

  5. Improper design and use: Improper design and use of bellows compensators can also lead to the pull-off phenomenon. For example, if the bellows section is too thin and cannot withstand the pressure, or if the pull rods are partially removed during pressure testing and the compensator is not properly secured, it can cause stretching.

In summary, the reasons for the pull-off phenomenon of Corrugated Compensator is mainly related to improper arrangement of fixed supports, inadequate adjustment of pull rod devices, residual stress caused by cold working, restriction on pipeline contraction, and improper design and use. To prevent the occurrence of the pull-off phenomenon, it is essential to strictly follow specifications during installation and use, ensuring the correct arrangement and adjustment of fixed supports and pull rod devices.

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