RADCOFLEX Discusses Technical Considerations When Selecting a Fabric Expansion Joint

Expansion joint

RADCOFLEX recommends the purchase of complete assemblies,
ready for lifting into place. Fit and assembly are guaranteed since the fabric
element is attached to its flanges at the factory. A key benefit is that the
assembly is part of a fixed cost, eliminating any variables that may occur at
the site.

Large expansion joints requiring shipment in sections must
be factory pre-assembled, matched, marked and packaged for easy assembly after
storage. Complete instructions are included with every expansion joint and field
service supervisors or installation crews are available if desired.

Calculating movement

The amount of movement a fabric expansion joint is capable
of is related to the width of the working face to face (span) of the fabric.

The axial movement capability can be calculated by dividing
the width of the span by three (3); i.e., a fabric span of 150mm would provide
50mm of axial movement.

The lateral movement capability can be calculated by
dividing the width of the span by ten (10); i.e., a fabric span of 150mm would
provide 15mm of lateral movement.

When joints are required to absorb angular and torsional
movements, engineering calculations are required.

Fabric expansion
joint replacement

The fabric portion of an expansion joint should have a long
service life that matches the life of the ductwork. The eventual replacement of
this component should be a consideration in its selection.

RADCOFLEX’s ‘flat belt’ style fabric membrane can be
replaced at a fraction of the original expansion joint purchase price. Many
specially formed fabric elements, available at a slightly lower initial cost
require complete replacement, which results in a significantly higher cost over
the life of the plant.

Field splicing of
fabric membranes

The flexible membrane of a fabric expansion joint may
require splicing at the jobsite, such as for membrane replacement or large
assembly installation. RADCOFLEX can provide heat seal irons, on-site
supervision services, and/or detailed splicing instructions if required.

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