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Universal Unrestrained
This expansion joint contains two bellows
elements separated by a center pipe section or spool. This type of arrangement
provides a design that can accommodate large amounts of lateral deflection. The
amount of lateral deflection is dependent on the amount of angulation each
element can absorb and the distance between the bellows. The Universal
Unrestrained expansion joint can also accept axial and angular movements in
addition to the lateral. This expansion joint does not have restraint hardware
to resist pressure thrust, and must be treated similar to the Single
Unrestrained expansion Joint and properly anchored and supported. The Universal
Expansion Joint design should also consider the thermal movement of the center
pipe section.
Universal Tied
This expansion joint has the same characteristics as the Universal Unrestrained
expansion joint, with the addition of tie rod hardware.
With the addition of the tie rods to restrain pressure thrust,
the expansion joint will not accept external axial movement.
However, the thermal expansion between the tie rods (within the
expansion joint) shall be accommodated by the bellows elements.
If more than two tie rods are used to restrain pressure thrust,
the unit will not accept angular rotation. If only two tie rods
are used at 180 degrees apart, the unit can deflect angularly as
well as laterally. In many cases, the Tied Universal expansion
joint is installed between two elbows in a piping system. In order
to minimize the effect of deflection of the elbows, the tie rods
are often installed on the elbow centerlines.
Return to EXPANSION JOINTS
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