Samflex expansion joints are designed to withstand
the hot corrosive gases found in flue ducting systems.
They are superior in handling thermal movements,
vibration isolation, and help reduce mechanical noise.
Samflex expansion joints are especially suited to
installation in duct work associated with fans,
scrubbers, precipitators, and baghouses and for use in
breaching systems for air pollution control that are
found in most industrial plants such as, power plants,
steel mills, paper mills, foundries, chemical and glass
plants, asphalt and cement plants.
FLEXI-DUCT
TYPICAL EXPANSION JOINT COMPONENTS
① Gas Seal Flexible
Membrane
Samflex Flexi-Duct gas seal flexible membrane is designed to withstand
system pressure and be resistant to chemical attack from the interior
and the exterior. The gas seal must also have the flexibility
to absorb thermal movements. Depending on the system
temperature, it may or may not require additional thermal
protection.
② Insulating Layers
Samflex Flexi-Duct insulating layers provide a thermal barrier
to ensure that the inside surface temperature of the gas
seal membrane does not exceed its maximum service temperature.
The insulating layer can also reduce condensation caused
by the gas stream coming in contact with the "cool"
surface of an uninsulated gas seal membrane.
③ Back-Up Bars
Samflex Flexi-Duct backup bar, positioned at the flange attachment,
uses clamping pressure to create the fabric-to-duct seal
and restrains the fabric when it is subjected to the system
pressure. The thickness and width of Samflex's backup
bar should be sufficient to perform this function with the bolt
spacing being used. The edges of Samflex's backup
bar have a radius to preclude cutting of the fabric.
④ Metal Liner or
Baffle
Samflex Flexi-Duct liner is designed to protect the gas seal
membrane and insulating layers of the flexible element
from abrasive particles which may be present in the gas stream.
A liner is also used to reduce flutter of the fabric
element caused by turbulence, to help control the accumulation
of dust or ash in the expansion joint cavity and to reduce
the temperature of the flexible element.
⑤ Fly ash barrier
Samflex Flexi-Duct fly ash barrier system is intended to deter
fly ash from building up in the expansion joint
cavity. it is typically used. in conjunction with a liner, in
duct runs from boilers to air clean-up equipment
such as precipitators, scrubbers and bag houses, or whenever
high amounts of dust or ash are present in the
gas. A fly ash barrier must be capable of retaining its strength
and flexibility while being exposed to maximum
system temperatures and media.
