Non-metallic expansion joints are flexible connectors designed to provide stress relief in ducting systems by absorbing movement caused by thermal changes. They also act as vibration isolators, shock absorbers and, in some instances, to compensate for minor misalignment of adjoining ducting or equipment. They are fabricated from a wide variety of materials, including synthetic elastomers, fabrics, insulation materials and fluoroplastics, dependent upon the process environment in which they must operate.
The generic description ‘Expansion Joint’ covers a wide variety of products used to absorb movement in ducts and pipelines.
There are many applications for these products, and there is some overlap between the various types of expansion joint that can be used for a specific purpose. However there are general groupings which help to define the types of expansion joint, and their applications. Both metallic and non-metallic expansion joints can be used in ducts or pipelines
Expansion Joint Guides
It is apparent that there is wide ambiguity with the terminology used in connection with expansion joint technology. Although there are a number of guides describing expansion joints and their application, these are either biased on a particular type of technology, or are more complicated than necessary. Consequently, the Division has focused initially on providing comprehensive guides to European expansion joint technology, which are easy to use and understand.
Expansion Joint Publications
Read the latest articles from the EJD members about expansion joint design, best practice etc.