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 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 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 Insulation Pillows (CIP)

Cavity Insulation Pillow (CIP) - A style CIP provides additional thermal protection to the belting material for high temperature applications.

Typical cavity pillow construction consisting of layers of insulation encased in a protective sleeve.

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 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 Liner

• 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 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.

Braided Hose Seal (BH)

Flexible stainless steel braided hose with enclosed ceramic insulation is often specified for expansion joints in areas of high particulate loading. The hose is secured between the flow liners to prevent particulate from entering the expansion joint cavity. This accessory along with a cavity pillow works well in cement plants.

Tadpole Gasket Tape (TG)

When using integral flange-type expansion joints in duct systems with positive pressure operating conditions, Senior Flexonics Pathway recommends the use of tadpole gasketing between the flexible element flange and backup bars (as illustrated). This prevents the heads of the erection bolts from abrading the outside cover of the flexible element. This option also protects both flat and integrally flanged belts during large lateral or compression movements. TP

Flow Deflector (FD)

In some expansion joint installations, an angle flow deflector is added to the design to increase the service life of the joint. A flow deflector is used to prevent moisture and particulate from sliding down vertical duct walls and being trapped in the expansion joint cavity by the flow liner.