These expansion joints will extend in length when under pressure conditions unless adequately restrained by anchors and guides. Preferably the joints should be located adjacent to anchors with the first guide not more than 4 pipe diameters from the expansion joint. The next guide should be positioned 14 pipe diameters from the first, and subsequent guides as necessary, to ensure the pipeline is free from sag or pressure deflection. See example figures below.
These expansion joints are supplied at a neutral length but can be "cold drawn" on installation. Particular care should be taken to make sure that the expansion joints are installed with the flow arrows in the right direction and avoid weld splatter from coming into contact with any membranes.