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Single Unrestrained
As the most basic of
expansion joints, the Single Unrestrained joint consists of a single bellows
element and end connections. This joint will deflect in any mode listed under
Bellows Deflections, and is usually the first considered in system design. The
Single Unrestrained Expansion Joint will require the most control of the
adjacent piping with respect to anchors and guiding, and will not control the
movement of the piping in any direction. Proper anchoring and guiding must be
used to control the piping and restrict the movement to only that specified for
the expansion joint design. This expansion joint will not resist deflections
with any force other than the spring force of the bellows, nor will it resist
the pressure thrust force along the axis of the bellows. This force must be
handled by the use of main and directional anchors.
Single Tied
This expansion joint
type has the same characteristics of the Single Unrestrained Expansion
Joint,with the addition of the tie rod hardware. The tie rods are designed to
restrain the system pressure thrust and prevent the bellows from over-extending.
This expansion joint is not usually designed to allow axial movement. In the
case of a tied unit with axial movement, the rods function as limit rods with
the stops set to allow axial movement of the bellows within a specified limit.
The Single Tied Expansion Joint can be designed to accept lateral movement in
any plane, as well as, angular in a single plane. The angular deflection can be
accommodated with a two tie rod design.
Return to EXPANSION JOINTS
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