The Lateral Expansion Joints also called as Tied Universal or Tied Lateral Expansion Joints and are used to absorb lateral deflection and angular rotation. When close control of movement is not necessary or shear loading is not present a tied universal expansion joint or Lateral Expansion Joint can be used in place of Hinge or Gimbal Expansion Joint.
The tied Universal Expansion Joint is designed to absorb large amounts of lateral deflection while absorbing the pressure thrust. The joint is made up of two single bellows elements connected by a piece of pipe called as center spool. The tie rods are then attached on the outer ends and span both the bellows and the center spool. This type of construction allows the bellows to absorb the thermal growth of the piping between the tie rod attachments while eliminating the pressure thrust on the system. The pressure thrust on the system is absorbed completely by the tie rods.
The most common application of the tied universal expansion joint is the Z shape system. In the Z shape system the the thermal growth of the horizontal sections is absorbed as lateral deflection by the product as shown in adjacent figure.
In this type of application the joint should be designed to fill the entire offset leg so that it’s expansion is absorbed within the tie rods as axial movement. One important advantage of this type of lateral expansion joint is that the piping system does not have to be in one plane. The two horizontal sections in angular expansion joints may lie at an angle in the horizontal plane as shown in adjacent figure.
Requirement