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what’s the Insulation Pillows fabric expansion joint

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On 2022-10-14
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Fabric expansion joints are extremely flexible and can be made from a variety of special woven fabrics coated or laminated with selected elastomers or fluoropolymers. Fabric bellows are used to insulate, to avoid mechanical loads and to protect against abrasion.

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1 Typical materials used in the construction of insulation pillows include:
2 Flexible Element Components

The main advantage of a fabric expansion joint for pipework design is that it can absorb movements simultaneously in several directions. Further, fabric bellows have almost no reactive forces and require little space. Fabric bellows are easy to customize to suit existing operating conditions and are easy to transport and install.

In comparison to metallic expansion joints; fabric expansion joints offer almost unlimited flexibility by giving pipework designers more options. Mostly, fabric expansion joints are installed in systems operating with low pressure and dry media.

Insulation Pillows

Insulation and accumulation pillows are used to protect the flexible element from the system’s heat and prevent fly ash from filling the expansion joint cavity. The insulation/ accumulation pillow is comprised of multiple layers of high density mechanically bonded thermal blankets wrapped in a high strength cloth and/or alloy cases designed to meet the system’s conditions. The pillow is secured to the frame underneath the belt with tabs or by welded pins with speed washers (or other unique methods). Attaching the pillow to the frame sides ensures that the pillow stays in the proper position after the joint has moved axially or laterally. Without such a feature, the pillow would become compressed and not cover the entire width of the expansion joint cavity, allowing hot gas and/ or fly ash penetration. Pillows can be used with Flat Belts or U-Shaped varieties.

Typical materials used in the construction of insulation pillows include:

Internal Matting

  • 11# density mechanically bonded type “E” fiberglass needle mat (Temperatures up to 1000°F)
  • High density mechanically bonded ceramic needle mat (Temperature >1000°F)

External Case Covers

  • 18 oz., 24 oz., and 32 oz. unique tightly woven fiberglass and vermiculite coated cloth
  • Aluminum coated (aluminized) or aluminum laminated fiberglass cloth
  • Silica cloth (Temperature >1000°F)
  • Knitted stainless steel, Inconel® or other alloy — wire mesh can be used with these materials
  • Aramid/Kevlar® blended fabrics

Tabbed Pillow

A tabbed insulation pillow is comprised of mechanically bonded insulation blankets wrapped in a cloth/alloy case. The pillow’s integral flanges are bolted in place underneath the flexible element and backing bars. This method of attaching the pillow to the frame sides ensures that the pillow stays in the proper position, up against the belt, to provide the belt with the highest degree of thermal protection. Without such a feature, the pillow would sit loosely within the expansion joint cavity and could allow hot gas and/or fly ash to come in contact with the flexible element.

Pinned Pillow

A U-shaped insulation pillow is comprised of mechanically bonded insulation blankets wrapped in a cloth/alloy case. The pillow is formed into a U and secured to the expansion joint frame by means of welded pins and speed washers. This method of attaching the pillow to the frame sides ensures that the pillow stays in the proper position after the joint has moved axially or laterally. Without such a feature, the pillow would become compressed and not cover the entire width of the expansion joint cavity, allowing hot gas and/or fly ash penetration.

Block Pillow

A pillow block insulation pillow is comprised of mechanically bonded insulation blankets wrapped in a cloth/alloy case. This pillow design fills the expansion joint’s cavity with a large protective mass. Pillow blocks can be easily installed or replaced during an outage.

Fabric expansion joints are non-metallic flue duct expansion joints that provide stress relief for piping and ducting systems by absorbing thermal growth and shock, isolating mechanical vibration, and allowing for misalignments. We are a leading supplier of fabric expansion joints engineered to handle low-pressure (±3 psig) industrial applications including coal-fired power generation, gas turbine, marine, cement, incineration, nuclear, pulp & paper, refining, electrochemical with temperatures ranging from -100°F to more than 2000°F.

Flexible Element Components

The flexible element is the most active component of the expansion joint. It contains the gas seal and must be 100% non-permeable, and allow movement in all directions. The flexible element’s Structural Gas Ply must also be designed to withstand the system temperature and pressure and be chemically compatible. The Flexible Element may also include additional thermal barriers, as well as retaining and reinforcing plies. MIPR Corp offers flexible elements in both Flat Belt and U-Shaped “Integrally Flanged” varieties, and when combined with additional thermal layers and insulation pillows, are suitable for temperatures up to 2000°F.

Wilson Pipeline  is a leading manufacturer and distributor of flange fittings material from  alloy steel  stainless steel to carbon steel.products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings. ASME B16.5  ASME B16.9 ASME B16.11 EN1092,ANSI ASTM,GOST,JIS,DINWilson Pipeline products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.If you want to have more information  you want to share your enquiry with us, contact us at sales@wilsonpipeline.com

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