Sleeve – Fabric Expansion Joint

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An internal sleeve is indispensable when the fluid contains erosive particles and in all cases when the gas velocity is higher than 7.6 m/s (EJMA standards – Expansion Joints Manufacturers Association, Inc.).

An internal sleeve is indispensable when the fluid contains erosive particles and in all cases when the gas velocity is higher than 7.6 m/s (EJMA standards – Expansion Joints Manufacturers Association, Inc.).

The use of the internal sleeve:

  • eliminates turbulence and erosion, avoiding direct contact between the inner surface of the fabric expansion joint and the fluid
  • reduces fluid loss
  • reduces the temperature on the fabric expansion joint
  • reduces vibration and noise

Where the installation of an internal sleeve is expected, the following must be checked:

  • The sleeve has the exact same orientation as the flow direction
  • the construction dimensions must be respected on the basis of the expected movements so as not to cause interference during operation.

In the figures below, sections of some types of internal sleeves are indicated. These are applicable on all ducts with horizontal axis and in those with vertical axis, where the fluid has a direction from top to bottom.

If the multilayer fabric expansion joint is installed on a conduit with vertical axis and the direction of flow is from the bottom upwards, the baffle will have to be turned upside down and point counter flow.

The installation of a flow diverter must be done so as to prevent a massive accumulation of dust in the interspace between the expansion joint and the baffle itself.

If the baffles are to be installed by welding, this must be performed before the installation of the multilayer fabric expansion joint, which must necessarily be expected in open design.

If it is instead intended to be installed by means of bolting, the baffles must be placed simultaneously with the fabric expansion joint.

A sealing gasket between the baffle flange and the duct flange is called for. (Movements).

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