Gimbal Expansion Joints
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Gimbal expansion joints consist of a metal bellows enclosed within a gimbal ring or frame. The gimbal ring allows the joint to rotate in any direction, providing multi-directional movement capabilities. This design of gimbal expansion joint enables to joint to absorb angular rotation and lateral movement while controlling axial movement. The gimbal structure usually includes pins and linkages. That form a hing mechanism, permitting rotation about two perpendicular axis.
- Absorbs angular movements is all planes and angular rotation or any combination of these
- Eliminates pressure thrust loads
- Positive control over movements
The gimbal expansion joint is the most reliable expansion joint since it is capable of absorbing angular motion in all the planes. Although single gimbal bellows joint can be used in isolation the most common applications use a pair of gimbal bellows joints to absorb a complex multi-plane motion in a piping system. In adjacent figure Gimbal Expansion Joints are utilized in a pair to absorb the thermal expansion from the two horizontal piping arms. However note that the thermal growth of the vertical leg must be absorbed by the deflection of the horizontal piping.
Single Gimbal Type Expansion joint
To avoid this deflection in the horizontal piping arms one or more hinged expansion joints can be installed in the horizontal arms of the piping system as shown in adjacent figure. The use of gimbal expansion joint results in the best system which eliminates the effects of thermal growth and lowers both reaction forces and installation costs. Expensive main anchors are eliminated and only minimal guiding is required.
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- Absorbs angular movements in all planes, And angular rotations, or any combinations of these.
- Eliminates pressure thrust loads.
- Positive control over the movements.
- Can support the dead weight of the Intermediate Piping.
- Transmits external loads like wind loading and shear loading.
- Prevents torsion on the bellows elements.
- Minimum guiding required.
- Eliminates main actors.
Requirement
- Strong More space is required for Gimbal Bellows joints as compared to Axial Expansion Joints.required.
- Change of pipe direction is required.
- Two or more Gimbal Expansion Joints required to work as a system.