-––
[
CAVITY PILLOW
]
–-–
CAVITY PILLOW STYLES
The Senior Flexonics Pathway cavity pillows serve three purposes, retarding the
intrusion of particulate, thermal protection, and resistance to pressure pulsation.
Our pillows are fabricated from selected insulation materials and wrapped with a
high temperature fabric, designed for the operating conditions. Standard pillows are
provided with “ears” or tabs that fasten under the belt and backup bars to hold the
pillow in place. The ears are designed to provide a memory to the
pillow such that it will return to an “as installed” uncompressed
state after plant cool down, during outages.
CAVITY ACCUMULATION PILLOW (CAP)
A cavity created between the structural steel frame/flanges and the
gas seal (fabric expansion joint) is designed to provide a standoff
Style - 1
between the fabric element and the flue gas. This cavity can fill
with particulate falling out of the flue gas. If these deposits are
allowed to buildup the expansion joint will fail to operate properly
and could become damaged. Senior Flexonics Pathway
recommends the use of an accumulation pillow designed to occupy
this “dead space”, preventing the deposits from entering and filling
this cavity. The cavity pillow in conjunction with a flow liner will
Style - 2 prevent the accumulation of particulate/fly ash. Many
maintenance managers view this option as a low cost insurance
policy that extends the service life of the expansion joint.
HIGH TEMPERATURE CAVITY Typical cavity pillow
INSULATION PILLOWS (CIP) construction consisting
Cavity Insulation Pillow (CIP) - A style CIP provides additional of layers of insulation
thermal protection to the belting material for high temperature encased in a protective
Style - 3 applications. high temp sleeve.
-––
[
FLOW LINERS
]
–-–
Flow liners (baffles) are metal shields designed to provide protection for the fabric element and/or
cavity pillow from direct impingement of particulate or particulate accumulation. 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
Integral Liner
flexible element. Flow liners can be supplied on a variety of profiles (straight, airfoil, semi-airfoil
or telescoping) and materials. (Standard profile and material are straight 10 GA. A569 C.S.). Flow
liners fall into the following categories.
■
Integral liners are pre-manufactured parts of the expansion joint frame as on SR2700 and
SR2750 series frames.
■
Bolt-in liners are primarily used on integrally flanged style expansion joints as on our U1000
Bolt-in Liner
series, between the belt or expansion joint flange and the mating duct flange. Gaskets are
required on metal-to-metal and/or Teflon
®
-to-metal connections.
■
Weld-in liners spanning the breach opening can be either welded in the field to the duct
interior or can be supplied welded in factory to the expansion joint frame.
Weld-in Liner
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