Metal Bellows Designs: Heat,
Pressure and Movement
FlexCom custom metal bellows
are designed primarily to accommodate and compensate for three
types of operational loads: heat, movement and pressure.
In addition, a metallic expansion joint must adequately
isolate vibrations, protecting
components and ductwork/piping from unnecessary wear and tear.
Heat is one of the greatest sources of operational load: high
temperatures, in either liquids or gases transferred through the
joint, will cause metallic elements in the ductwork, components
and joint to expand and becoming misaligned from adjacent
application elements. A FlexCom metallic expansion joint
is custom designed to compensate for high temperatures
(depending on model, up to 2500F) and ductwork/pipeline
movement, preserving efficient connections between components
and adjacent ductwork under a full operating load.
Pressure represents another source of significant application
load. While most gas transfer applications (served by fabric
and composite joints) involve low pressure levels - 5 to 7
pounds per square inch - certain gas and liquid applications can
face much higher loads, subjecting an expansion joint to
pressures as high as 300 psi. For these applications, a custom
designed FlexCom metal expansion joint is ideal for maintaining
an efficient connection without deformation, damage or failure.
Movement loads are the stresses created when heat and other load
elements cause adjacent components and ductwork to shift from
their initial positions and become misaligned. Movement loads
are classified into four types - axial, angular, lateral and
rotation - and expansion joints are regularly called upon
to compensate for combinations of these multiple movement types,
in addition to providing adequate heat/pressure load tolerance
and vibration isolation.
By carefully designing each FlexCom expansion joint for
your unique application specifications, we ensure that you
receive the most efficient metal bellows available on the
market today: a quality expansion joint, built from the start to
achieve an ideal balance between the challenging heat, pressure
and movement loads that define your specific system.
Learn more about the decisions we make when we design a FlexCom
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