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Summary of Some Knowledge on the Use of Bellows Compensators
Release time:
Jul 16,2022
Before installation, bellows expansion joints require some pre-stretching. The purpose of pre-stretching is to reduce the load-bearing capacity of supports on pipelines and equipment when the pipeline deforms, thereby minimizing the reverse displacement thrust generated after the metal bellows expansion joint has undergone deformation. When performing pre-stretching on a bellows expansion joint, it is essential to take into account the allowable compensation range specified for the pipeline.
Before installation, bellows expansion joints require some pre-stretching. The purpose of pre-stretching is to reduce the load-bearing capacity of the pipe supports and equipment when the metal bellows expansion joint undergoes deformation and generates a relatively large reverse displacement thrust. When performing pre-stretching on a bellows expansion joint, it’s essential to take into account the allowable compensation range specified for the pipeline.
Pre-stretching the compensator will not affect the amount of compensation or its service life. It’s important to note here that pre-stretching cannot increase the magnitude of the compensation itself. When performing axial pre-stretching on bellows compensators, this can be done in advance by the manufacturer. However, if other types of deformation are required, more specific operations must be carried out at the installation site.
When performing pre-stretching, you need to leave a gap on one side of the pipe that is required for pre-stretching. After one end of the bellows compensator is properly connected to the pipe, the other end should then be cold-tightened in the direction opposite to the thermal expansion until the reserved gap is completely filled.
The pre-stretch amount of a stainless steel bellows is typically about half the compensation amount. For bellows with larger compensation amounts, the reduction in thrust after pre-stretching is also greater. As for bellows with smaller compensation amounts and those used to absorb vibrations, we generally do not perform pre-stretching on their compensators.
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