Lateral Deflection is the relative displacement of the two ends of an Expansion Joint perpendicular to its longitudinal axis.
Angular Rotation is the displacement of the longitudinal axis of the Expansion Joint from its initial straight line position into a circular arc.
Concurrent movements are developed when two or more movements in a pipe system occur at the same time.
If multiple movements exceed single arch design there may be a need for additional arches.
To perform calculation for concurrent movement when a pipe system design has more than one movement, please use the following formula:
Actual Axial Compression + Actual Axial Extension + Actual Lateral (X) + Actual Lateral (Y) = / <1
Rated Axial Compression + Rated Axial Extension + Rated Lateral (X) + Rated Lateral (Y)
Calculation must be equal to or less than 1 for expansion joint to operate within concurrent movement capability.