The bellows is easy to understand as a flexible metal tube, but you can easily mis install it and undo all its potential in a single stroke. If it’s off-center, over-compressed, or improperly guided, it becomes the weak point in the whole pipeline and can cause leaks, fatigue, and downtime. The risk is greater than many installers realize, since these fittings are supposed to accommodate movement, not create it. The installation process starts with understanding how metal expansion joints are supposed to work.
In this article, we will help you understand common mistakes during bellows installation and the consequences of making them. We will also see how one can ensure that their bellows is installed correctly. Avoid these mistakes, and you will have a perfect bellows that will serve its purpose for many years to come.
Top Common Bellows Installation Mistakes That Can Reduce Performance
Problems that arise when bellows are improperly installed include leaking, vibration, wear, and inefficiency. Being mindful of problems arising from improper installation is key to efficient performance.
- Choosing the wrong bellows size
The bellows sizing becomes very important at the time of installation of the bellows. In case the bellows become undersized, there is a possibility that they will not provide the required motion. On the other hand, in case the bellows become oversized, there could be difficulties in mounting them and support issues could arise. In both cases, their performance could be affected.
- Ignoring manufacturer installation guidelines
Each model has its own installation requirements. There could be difficulties if the same technique is used for all products. A reputable company specializing in metal expansion joints manufacturing will give you specific recommendations for handling, installing, welding, and testing each item. Do not assume anything, but follow the recommendations.
- Using incorrect pipe alignment
Misalignment of the pipes ranks among the most prevalent reasons for bellows malfunction. If there is no correct positioning of the pipes, there can be additional stress on the bellows. Imagine putting together two pipes that are improperly positioned. In this way, the stress goes to the bellows instead of it performing its intended function.
- Forgetting to remove shipping restraints
There are always temporary shipping bars or restraints in some bellows. These components serve to ensure the stability of the product during transportation and handling. Their retention in place after installation will result in restricted operation of the bellows, which can add additional pressure on adjacent pipes and machinery. Temporarily installed restraints should be removed at the required installation phase.
- Using the wrong pipe supports
Support for the pipes will ensure that the movement and weight of the piping is well controlled. The inappropriate positioning of the supports will cause extra loading of the bellows. In cases where the weight of the pipes is not adequately supported, it may result in the pulling of the bellows.
- Twisting the bellows during installation
Metallic bellows are designed for particular movements. These bellows are not supposed to bear any unintended twisting during installation. The twisting of the bellows can impose uneven pressure on the convolutions. It may lead to cracks or decreased flexibility. Metal bellows should be kept in their natural position without twisting to align pipes.
Conclusion
Bellows fitting is not all about joining two tubes together; there are several other elements involved. The elements include positioning, motion, welding, supports, and pressure rating. Any mistake might affect the entire piping system.