Deformation issues of bellows compensators
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The steam pipeline compensator in the workshop has undergone such deformation – can it still be used? Is there a hidden risk? Looking for alternative solutions; hope experts can offer some advice
It should be the senior leaders with broader authority who make the decisions; if there are issues at the lower levels, those can be addressed later. But you must inform your superiors as well, as it’s best for them to make the decisions. (It’s better to watch the previous video.)
I’m not sure about the requirements for uploading images; the pipe is DN150. The deformation is axial
If there is deformation in the design drawings, they can be used as long as it does not exceed the design requirements; otherwise, they cannot be used.
If it’s not under axial compressive deformation, then it’s definitely no longer usable – it could lose stability at any time, and instability would lead to leakage
Axial use is not allowed; safety first, thank you!
1. No specific information is available, so no conclusions can be drawn arbitrarily. 2. General information: 2.1. Free-type bellows expansion joints with a high number of wavelengths are prone to columnar instability； But as long as the working pressure is below the critical pressure for instability, it can operate safely. 2.2. For free-type bellows expansion joints, pure axial compression and tension can occur safely as long as they do not exceed the allowable values. 2.3. In free-type bellows expansion joints, any lateral displacement will consume a large portion of the available axial deformation capacity; therefore, only minimal lateral displacement is allowed. 2.4. Hinged expansion joints allow for angular deformation without causing axial displacement. 2.5. Due to its relatively small size, DN150, the likelihood of planar instability is low; planar instability is also a form of failure. 3. The relationship between bellows parameters and compensation capacity as well as safety: 3.1. The wave height and wave pitch of the bellows are related to its compensation capacity. 3.2. The thickness and number of layers of the bellows affect both its compensation capacity and its ability to withstand pressure. 3.3. The material used for the bellows must be suitable for the corresponding medium conditions, including its corrosion resistance. 4. When asking for advice, it is essential to provide clear background information; otherwise, it will be impossible to give valuable suggestions