-––
[
MOVEMENT
CAPABILITIES
]
–-–
The system thermal expansions are the differential
expansion/contraction of operating and/or excursion
temperatures and the minimum ambient temperature during
installation and shutdowns. The expansion joint engineer uses these
movements and temperatures to select the proper material and design for
each expansion joint. Senior Flexonics Pathway’s nonmetallic expansion
joints frequently can handle combined axial, lateral, angular and torsional
movements in a single assembly.
The expansion joint locations can often be optimized, reducing the total number required. Consideration should be
given for accessibility and belt replacement, for new ducting systems, it may be more economical for the duct fabricator
to provide a portion of the expansion joint frame.
Lateral Movement - The amount of duct movement occurring in either or both
of the two perpendicular planes to the longitudinal axis of the duct,
which moves the expansion joint flanges out of alignment.
Axial Compression/Extension - The dimensional shortening
(compression) or lengthening (extension) of the expansion joint
face-to-face dimension parallel to it’s longitudinal axis.
Torsional Deflection - The amount of twisting movement (in degrees)
occurring in the perpendicular planes to the longitudinal axis of
the duct system.
Angular Deflection - The amount of rotation (in degrees) of the duct
system which flexes the expansion joint flanges out of parallel position
with each other.
TYPICAL MOVEMENT CAPABILITIES BREACH OPENING
FACE-TO-FACE
Belt Type Active Length 6” (152mm) 9” (229mm) 12” (305mm)
Single Layer Axial Compression 2” (51mm) 3” (76mm) 4” (102mm)
Fabric Element Axial Extension 1/2” (13mm) 1/2” (13mm) 1/2” (13mm)
(Non-concurrent) Lateral 1” (25mm) 1 1/2” (38mm) 2” (51mm)
Axial Compression 1” (25mm) 1 1/2” (38mm) 2” (51mm)
Set Back
Composite Belt
Axial Extension 1/4” (6mm) 1/4” (6mm) 1/4” (6mm)
(Concurrent)
Active Length
Lateral 1/2” (13mm) 3/4” (19mm) 1” (25mm)
Integrally Flanged Axial Compression 2” (51mm) 3” (76mm) 4” (102mm)
Active Length
Single Layer Axial Extension 1/2” (13mm) 1/2” (13mm) 1/2” (13mm)
(Concurrent) Lateral 1” (25mm) 1 1/2” (38mm) 2” (51mm)
Set
Notes:
Back
1. Special considerations must be made when movements exceed those listed above or differ from nonconcurrent or concurrent
ratings. Consult with factory for these applications.
2. Breaching tolerances: Axial extension 1/4” (6mm), axial compression 1/2” (13mm), lateral + 1/4” (6mm). Exceeding these
tolerances will affect movement capabilities.
Breach or
3. Lateral movement exceeding 3” (76mm) should utilize cold lateral offset (preset) to reduce the relative belt movement.
F/F DOM
7
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