Bellows
Rubber Bellows
- The expansion joints are designed, fabricated and tested to provide an accurate and effective solution to the customer’s requirements.
- Rubber bellows are manufactured as per standard ASTM F1123 – 87and KFI standards.
- The number, shape and construction of the convolution depend on the movement, pressure, temperature, media and fatigue life
- A combination of experience, calculation and practical testing make a good bellow, which is critical in order to give the level of performance as required.
- While designing a bellow following parameters are taken into consideration, Pressure, Temperature, Corrosion resistance, Minimum maintenance, Durability, Reliability, Long life, Economy, Performance and Safety.
- Common applications include air operated construction equipments, power air operated drills, mining equipments in oil & gas exploration, and many more industries.
Data Sheet
Applications
Construction
- Rubber Expansion joints are fabricated with an elastomeric tube reinforced with multiple plies of fabrics covered with synthetic rubber
- The fabrics are Nylon®, Polyester and Aramid.
- An additional reinforcement to the fabric may be provided in the body of the expansion joint and may be solid metal rings or wire embedded in the rubber.
Key Feature
Absorb Lateral movements: Lateral movement is the relative displacement of one end of the bellows to the other end in a direction perpendicular to its
longitudinal axis.
Absorb Angular and Torsional Movements: Angular movement is the rotational displacement of the longitudinal axis of the bellows toward a point of rotation. Torsion refers to twisting one end of the bellows with respect to the other end, about the bellows centreline
Reduce Vibration: Rubber expansion joints isolate or reduce vibration caused by equipment. The transmission of vibration is reduced and they protect equipment from these adverse effects
Dampen Sound Transmission: Rubber expansion joints tend to dampen the transmission of sound because of the steel rubber interface of joints and mating flanges
Types of Rubber Bellows
- Handmade | Molded with floating flange
- Full Face Rubber backing Metal Fixed Flange
- Tied with Control Units
- Arch Filled
- Rectangular
- Reducing
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 | Reducing expansion joints are designed and manufactured to allow the connection of different diameter pipes. There are two main types of reducer: concentric and eccentric reducers. Reducers are usually concentric but eccentric reducers are used when required to maintain the same top-or bottom of-pipe level. |
Bellows
Rubber Bellows
- The expansion joints are designed, fabricated and tested to provide an accurate and effective solution to the customer’s requirements.
- Rubber bellows are manufactured as per standard ASTM F1123 – 87and KFI standards.
- The number, shape and construction of the convolution depend on the movement, pressure, temperature, media and fatigue life
- A combination of experience, calculation and practical testing make a good bellow, which is critical in order to give the level of performance as required.
- While designing a bellow following parameters are taken into consideration, Pressure, Temperature, Corrosion resistance, Minimum maintenance, Durability, Reliability, Long life, Economy, Performance and Safety.
- Common applications include air operated construction equipments, power air operated drills, mining equipments in oil & gas exploration, and many more industries.
Data Sheet
Applications
Construction
- Rubber Expansion joints are fabricated with an elastomeric tube reinforced with multiple plies of fabrics covered with synthetic rubber
- The fabrics are Nylon®, Polyester and Aramid.
- An additional reinforcement to the fabric may be provided in the body of the expansion joint and may be solid metal rings or wire embedded in the rubber.
Key Feature
Absorb Lateral movements: Lateral movement is the relative displacement of one end of the bellows to the other end in a direction perpendicular to its
longitudinal axis.
Absorb Angular and Torsional Movements: Angular movement is the rotational displacement of the longitudinal axis of the bellows toward a point of rotation. Torsion refers to twisting one end of the bellows with respect to the other end, about the bellows centreline
Reduce Vibration: Rubber expansion joints isolate or reduce vibration caused by equipment. The transmission of vibration is reduced and they protect equipment from these adverse effects
Dampen Sound Transmission: Rubber expansion joints tend to dampen the transmission of sound because of the steel rubber interface of joints and mating flanges
Types of Rubber Bellows
Handmade | Molded with floating flange
- Hand built rubber bellows are designed to neutralise movement, compensate for small amounts of misalignment and reduce noise and vibration in pipelines.
- They are purpose manufactured and tailored to fit any application.
- These are the standard moulded or custom-made Expansion Joints consisting of high-quality rubber body incorporating floating flanges.
- Where negative pressures and vacuum conditions exist, it is recommended that vacuum support rings be used.
- These are usually built in to the body of the bellows, but can be retrofitted if required. The size of vacuum support rings is determined by the negative pressure rating require
Full Face Rubber backing Metal Fixed Flange
- Hand built rubber bellows are designed to neutralise movement, compensate for small amounts of misalignment and reduce noise and vibration in pipelines.
- They are purpose manufactured and tailored to fit any application.
- These are the standard moulded or custom-made Expansion Joints consisting of high-quality rubber body incorporating floating flanges.
- Where negative pressures and vacuum conditions exist, it is recommended that vacuum support rings be used.
- These are usually built in to the body of the bellows, but can be retrofitted if required. The size of vacuum support rings is determined by the negative pressure rating require
Tied with Control Units
- Control Unit (Limit rods) to restrict the bellows axial movement range during normal operation. In the event of a main anchor failure, they are designed to prevent bellows overextension while restraining the full pressure loading and dynamic forces generated by the anchor failure.
- A control unit assembly is a system of 2 or more control rods placed across the expansion joint from flange to flange to set the maximum allowable expansion/contraction of the expansion joint and that will contain the pressure thrust.
- Recommended on most applications to prevent damage due to excessive pipe movements, each rod incorporates double nuts on each end to keep the expansion joint from over- elongating and spherical washers to allow Lateral, Angular and some Torsional movements as well as to accommodate moderate piping misalignments.
Arch Filled
- Filled arch-type expansion joints may be supplied with a bonded-in-place soft rubber filler to provides a smooth interior bore. Filled arch design reduces possible turbulence and prevents the collection of solid materials that may settle from the solution handled and remain in the archway. Filled arch joints also have a seamless tube so the arch filler cannot be dislodged during service
- Advantages: Reduces flow turbulences, Avoids solid deposits in the corrugations.
- Disadvantages: Decrease the flexibility. Movements of expansion joints with filled arches are limited to 50% of the normal movements of comparable size expansion joints with unfilled (open) arches.
Rectangular
- Rectangular Rubber expansion joints can be manufactured in square or rectangular shape and in any dimension.
- They can be also produced with or without arch and with multiple arch design for absorbing greater movements
Reducing
Reducing expansion joints are designed and manufactured to allow the connection of different diameter pipes. There are two main types of reducer: concentric and eccentric reducers. Reducers are usually concentric but eccentric reducers are used when required to maintain the same top-or bottom of-pipe level.