• Belt Type

    • FUNCTION OF FABRIC EXPANSION JOINT COMPONENT

    • A. Gas Seal Membrane : The gas seal membrane is intended 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 system temperature, it may require additional thermal protection.

    • Application
      Pressure
      Tag
      • Data 카탈로그 다운로드

제품설명

A. Gas Seal Membrane
The gas seal membrane is intended 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 system temperature, it may require additional thermal protection.
B. Insulating Layers
The 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 insulated gas seal membrane.
C. Insulating Retainer Layer
This layer is provided to keep the insulating layers in place in order to maintain thermal integrity. The retaining layer must be capable of withstanding gas stream temperatures and must be chemically compatible with system media.
D. Back up bars
Back up bars, positioned at the flange attachment, use clamping pressure to create the fabric-to-duct seal and restrain the fabric when it is subjected to the system pressure. The thickness and width of the back up bars should be sufficient to perform this function with the bolt spacing being used. The edges of the back up bars should have a radius to preclude cutting of the fabric.
E. Metal Liner or Baffle
A 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.s
F. Accumulation Bag
An accumulation bag is intended to deter flash 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 duct or ash are present in the gas. A flash barrier must be capable of retaining its strength and flexibility while being exposed to maximum system temperatures and media.
G. Fabric Attachment Flanges
Fabric attachment flanges are required to connect the flexible element to the ductwork. Properly designed, they can be attached directly to the duct work and thus eliminate the necessity for an adjoining duct flange. Flanges can be designed with a “landing bar” duct attachment which allows some installation misalignment without affecting the flexible element. the edges of the flanges in contact with the gas seal membrane should also have a radius to prevent damage.
H. Gasket
Fabric belts with insulating layers require a thermal insulating gasket to protect fabric components from hot attachment flanges and backup bars. Low temperature, single ply designs require flexible, chemically insert gasket.

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