Suitable only for applications operating under negative pressure But will accommodate relatively large movement
Another expertise of SE is to manufacture Fabric Expansion joints (bellows) of virtually any size & shape, from a range of proven standard constructions or designed especially for defined application.
It is essential that all the relevant parameters and conditions affecting Expansion Joints are taken into account SE has three basic types of Multi-Layer construction to meet the various needs of our customers
Type L for clean air systems : ranging from simple air intake/exhaust on fans and blowers to high temperature air discharge from heaters.
Type M for gas with low acid content: used on Gas Turbine Exhaust and less severe flue gas systems.
Type R for gas with high acid content: use in environments where the flue gas contains acids at temperature or acids that can form due to condensation at shut down.
Acid barriers are either PTFE impregnated glass cloth or PTFE foil thermally welded to ensure tight seal.
Multi-lyer fabric temperature range is from - 50sC and 1090sC with a standard pressure range of K 120s W.G.
An important difference in the SE Multi-Layer Fabric is that we do not rely on an insulation pillow to reduce the temperature in contact with the element.
The Multi-Layer Fabric is always designed to withstand the temperature regardless of secondary insulation pillow.
Many competitive designs rely on this insulation pillow for primary protection of their element with disastrous results after several temperature cycles
Distinct Advantages1. Accommodate relatively large movements and even some misalignment of flanges.
2. Light weight & easy to install and with the addition of
3. Internal
insulation bolsters have good acoustic properties
For retrofit application, we can supply as factory joined or open for on-site joining where access is limited.
Design of Multi Layer Elements
The design is based on the fabric element's ability to withstand the media
temperature.
Multi-Layer fabrics are offered in three basic styles:
Clamp-on, Belt-Type and Flange Type.
The five basic numbers shown below meet all positive and negative pressure
applications.
Suitable only for applications operating under positive pressure But will accommodate relatively large movement
Used when flange depth is limited and is suitable only for applications operating under positive pressure
Suitable for both +ve & -ve pressures If used with a suitable insulation bolster, will provide resistance to highest temperatures
Suitable for operating under both positive and negative pressures. Mostly for applications with small flanges and little movement
Temp. capabilities range from - 50s C - + 1260s C and pressure range from -50kPa to +50kPa
