Bolt adjustment issues for bellows expansion joints
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Gentlemen, after researching a lot of information regarding the bolt adjustment for bellows expansion joints, I have come up with the following conclusions. I would appreciate your feedback: 1) The bolt rods of a single-section bellows expansion joint can be removed. 2) In multi-section expansions, the bolts on the outside of the long bolt rod earplates are always kept tight, while the internal tie rods can be removed or used to loosen those bolts. Please correct me if I’m wrong
The bolts of expansion joints need to be loosened; however, for multi-section/long expansion joints, it is necessary to provide support for them to prevent bending
Expansion joints (pipe compensators) are divided into internal pressure and external pressure types. The internal pressure is used to control the extension of the structure’s length; in other words, the outer nut is locked while the inner nut is not constrained. To control the shortening of the structure under external pressure, it is necessary to lock the nut on the inner side, leaving the nut on the outer side unrestrained. For reference.
Literally, expansion joints mostly relate to internal pressure. But for long tie rods, if the bolts on the outside loosen, won’t the entire large expansion joint become unstable?
Think about it from a different perspective. What would happen if the expansion joint did not have a limit mechanism after being under overpressure? That’s why it is necessary to set such a limit mechanism. For reference.
Thank you. I guess the specifics will also depend on the installation instructions.