LATERAL EXPANSION JOINTS
Lateral expansion joints are used to absorb lateral deflection. Lateral expansion joints can move in all lateral directions simultaneously for absorbing expansion from two pipe sections in different directions. The lateral expansion joint is normally equipped with fixtures such as external tie rods, which allow the unit to absorb movements in all lateral directions but also to absorb the pressure thrust (incl. full vacuum).
LATERAL EXPANSION JOINT TYPES
If the required/specified expansion joint is not found in this product catalogue, please do not hesitate to forward your specifications to us. We are specialised in designing and manufacturing of customised solutions.
Lateral movement is movement perpendicular to the bellow’s longitudinal axis; it is a shearing movement of the bellows with one end offset from the other, usually with the ends of the bellows remaining parallel to each other. A single bellow expansion joint, working with a shearing action, can accept a relatively limited amount of lateral movement, especially when the flow characteristics of the system demand that an inner sleeve is necessary. For larger lateral movement capability, it is usual to utilise a twin bellows arrangement with an intermediate pipe between the bellows, the expansion joint lateral movement is taken up by an angular rotation of the bellows in opposite directions.
The amount of lateral movement available depends on the rotational movement capacity of each Bellows and the distance between them, increasing the distance between the bellows increases the lateral movement capability of the expansion joint proportionally. Lateral movement can be applied in more than one plane; in such cases it is important that the expansion joint designer is made aware of the total lateral movement to be applied.
Lateral movement is shown as LA and stated in mm. The parallel displacement is indicated as
negative (-) and positive (+).
The elongation of one side of the bellow is +10 and the compression of the other side of the bellow is -20. This will be shown as: LA +10/-20 mm. Equal parallel displacement is shown as: LA +/-20 mm (2λN).
As lateral expansion joints absorb movements in lateral directions in one or more planes, and absorb adjusting forces, they are widely used in more complex pipe systems with many different directions and levels.
Lateral expansion joints make possible the absorption of movements which are perpendicular to the longitudinal direction of the pipeline, and are therefore ideal for installation in pipe systems with bends, Z shaped pipe systems and in 3 hinged systems.
Lateral expansion joints can be used as tank settlement bellows, vibration absorbers and in all pipe systems with bends or a change in the pipe direction.
ADVANTAGES & REQUIREMENTS
- Absorbs movements in all lateral directions
- Absorption of large lateral movements with only one lateral expansion joint
- Reduced loads on all fix points as the tie rods absorb the loads without transferring pressure thrust on to the fix points
- For absorption of large expansions several lateral expansion joints are needed
- Many fix points and guides are needed for long pipe sections
With this you can effectively find technical data and select the expansion joint needed for your project.
BelMaker Light®” provides you; expansion joints selection from many parameters, searchable resistance tables, flange tables and much more.
Find useful information and do’ and don’ts in our installation instruction. Please note that failure to comply with our installation instruction could reduce the service life and pressure capability of the expansion joint, which could lead to damage or at worst breakdown of the expansion joint or the pipe system