| Expansion
Joint Accessories |
Expansion Joints are available
with a wide variety of accessories to meet specific design requirements.
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Liners are used to prevent
flow induced vibration or erosion caused by abrasive materials.
When lateral movement is required in the expansion joint, the flow
liner diameter must be reduced to provide clearance.
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Drop-in liners are used when conditions
require frequent replacement. This type of liner can also be furnished
in a telescoping configuration. Gaskets are required on both sides
of liner face to effect a seal. Sometimes called a top-hat liner.
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Telescoping liners are used on short expansion
joints with large axial movements. When fit close together, they
can also be used in systems where the flow can be in either direction.
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| Removable
Shrouds or Covers |
Removable covers are required
on flanged expansion joints in order to tighten the bolts during
installation. They also can be removed for inspection purposes.
In the event of a leak or failure, the shroud can help to deflect
the steam or other media.
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| Permanent
Shrouds or Covers |
All shrouds help to protect
the bellows from damage. This type of cover is used when removal
of the shroud for installation is not necessary. DME welds the cover
in place after the expansion joint has been inspected and pressure
tested.
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Tie rods are used to restrain
the thrust forces created by the internal pressure of the expansion
joint. Normally the system anchors are used to withstand the thrust
forces.
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Control rods are devises that
limit the individual travel of each bellows in a universal or dual
expansion joint. These rods can also be designed to support external
loads. Control rods are not normally designed to absorb the pressure
thrust loads.
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These control devises are used
to limit movement to the design capability. In the event of an anchor
failure, the rods will absorb the full pressure thrust loading of
the expansion joint. |
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Hinges are control devises
that limit the bellows to angular movement in one plane only. Standard
hinges do not require anchors. Slotted hinges will also permit axial
travel but must have anchors in the system.
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A female NPT port can be added
to any expansion joint provided there is a pipe or tube section.
Ports are used as a drain, to inject steam, for instrumentation,
or other applications. |
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Anchor bases are designed to absorb
the spring forces of the bellows. Single expansion joints with anchor
bases are placed at one end of the piping system, not in the center.
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Dual expansion joints allow
for large amounts of axial movement. They must be placed in the
center of the piping run and secured by using an anchor base.
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| Expansion Joints |
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| Exhaust Systems |
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| Flexible Metal Hose |
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