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This is the simplest type of expansion joint. As its name implies, it is constructed with one bellows and is used mostly to absorb axial movements. A single joint can also be used to absorb angular and lateral movements, as well as a combination of these 3 basic movements.
The figure below typifies good practice in the use of a single expansion joint to absorb axial movement. Note that the expansion joint is placed between two main anchors and that it is located near one of the anchors. Notice also that the first alignment guide is placed close to the joint, the second guide is close to the first and intermediate alignment guides are provided along the balance of the line.