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FABRIC EXPANSION JOINTS & BELLOWS
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.
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.
BELMAN FABRIC EXPANSION JOINTS
BELMAN-AI for air systems
The Fabric Expansion Joints within the Belman-AI series are designed especially for use in air systems (AI).
BELMAN-CH for chemical systems
The Fabric Expansion Joints within the Belman-CH series are designed especially for use in chemical systems (CH).
BELMAN-FG for flue gas systems
The Fabric Expansion Joints within the Belman-FG series are designed especially for use in Flue Gas systems (FG).
BELMAN-VA for various auxiliary systems
The Fabric Expansion Joints within the Belman-VA series are designed especially for use in various auxiliary systems (VA).
Belman Expansion Joints
since 1994
Belman Design Styles
Belt type expansion joint attached directly onto the outside of the duct using clamping bands normally used for:
1. Low temperatures (up to 300°C)
2. Low to medium velocity
3. Low to medium dust load
i.e.: Clean air ducts
Convoluted fabric expansion joints are attached directly onto the outside of the duct using clamping bands normally used for:
1. Large movements
2. Low velocity
3. Low dust content
4. Low temperature
i.e.: Pulp and paper industry
Fabric expansion joints mounted on vertical flanges, typically used in systems with:
1. Low flow velocity
2. Low dust content
3. Low temperature (up to 450°C)
The design can be made both with and without sleeve. The sleeve primarily acts to protect the fabric expansion joint from the particles in the flow medium
i.e.: Chemical industry (wet and dry)
Fabric expansion joints mounted on parallel flanges, typically used in ductwork with:
1. Medium temperature range (up to 500°C)
2. Higher flow velocities
3. Medium dust content in the flow
i.e.: Low temperature flue gas ductwork in conventional power stations
Fabric expansion joints mounted on parallel flanges with insulation bolster, typically used in plants with:
1. High temperatures (up to 600°C)
2. High dust content
3. High flow
i.e.: High temperature flue gas duct systems in
conventional power stations
Fabric expansion joints with floating sleeve construction are typically used in plants with:
1. Medium to high temperatures (up to 600°C)
2. Very high dust content
3. Low to high flow velocities
The floating sleeve gives good protection against
dust whilst allowing lateral movement.
i.e.: Cement industry
Hot to cold duct transition is often made in combination with a fabric expansion joint.
The purpose of the hot to cold duct transition is to be able to use a lower grade (and less expensive) duct material, by incorporating the insulation internally in the duct. Temperatures up to 650°C
i.e.: Gas turbine installations
Fabric expansion joints installed in refractory lined duct systems are typically used in plants with:
1. Very high temperatures (up to 1200°C)
2. Low to high dust content
3. Low to high flow velocity
i.e.: Incineration plants
Customised Designs
In addition to the styles shown here, we assist our clients in India with very special applications such as,
“picture-frame” units, pantographic linkage, pipe penetration seals and other special arrangements including “dog-bone” seals
for low-pressure ductwork carrying condensates and fluids.
Further details are available on request.
Technical Descriptions
data sheets
Fabric Expansion Joint Type Belman-AI is a multilayer design that safely absorbs movements caused by thermal expansions in pipelines and duct systems
The Belman-CH Fabric Expansion Joint type is a single-layer design that safely absorbs movements caused by thermal expansions in pipelines and duct systems…
Fabric Expansion Joint type Belman-FG is a multilayer design that safely absorbs movements caused by thermal expansions in pipelines and duct systems…
The Belman-VA Fabric Expansion Joint Type is a single- or multilayer design that safely absorbs movements caused by thermal expansions in pipelines and duct systems…
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- One to one expansion joint replacement
- New expansion joint project
- Improvement of an existing expansion joint
- Other expansion joint project requirements
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