Our rubber joints provide time-tested ways to accommodate pressure loads, relieve movement stresses, reduce noise, isolate vibration, compensate for misalignment after plants go on stream, and prolong the life of motive equipment. Hand-crafted rubber expansion joints are available in single – and multi-arch designs and are custom-engineered to fit your application requirements. Available options include PTFE-lined, eccentric reducing, concentric reducing, filled arch, lightweight and off-set configurations. They can be designed to operate up to 200 psi and withstand temperatures up to 500º F. Sizes available from 1/2″ to 144″.
Rubber Expansion Joints
Benefits of rubber expansion joints:
- Economy of minimal face-to-face dimensions
- Lightweight construction requires no special handling equipment
- Insulates against the transfer of noise and vibration
- Compensates for misalignment
- No electrolysis
- Greater recovery from movement
- Ease of Installation
- Small space requirements
- Low movement forces required
- Reduced fatigue factor
- Reduced heat loss
- Corrosion and erosion resistant
- No gaskets required
Superior Performance Characteristics
- Twice the capabilities of a standard arch
- Lower spring rates required for movement
- Fabric and steel reinforced
- Suitable for pressures up to 200 PSI and vacuum service
- Available in muti-arch, offset and special constructions
DuPont Kevlar® Reinforced Non-Metallic Expansion Joint
- Hand wrapped custom built construction to allow for design variations, while still offering wide arch movement
- Single, double, concentric and eccentric construction available
- Available in Viton®, EPDM, Butyl, Pure Gum and Nitrile
- Flanges are laser cut from carbon steel and other available alloys
- Extra – reinforced carcass
- For pressures to 300 PSI
- Available in constructions suitable for temperatures to 400ºF
- Available in multiple arch, taper, offset and special constructions
- Available in wide arch for increased movement
- Designed with moulded rubber flanged ends with bolt holes that accommodate standard steel flanges
- Furnished with or without helical wire reinforcement. Special tubes can be compounded to meet unique service conditions in either suction or discharge applications
Maximum deflection, elongation and compression.
- Minimizes water hammer and hydraulic shock
- Less force to move; allows maximum movements
- “All-in-one” design eliminates the need for retaining rings
- Available in Twin Sphere design for greater movement capabilities
- Floating flange design provides easy installation
Product Description of Rubber Expansion Joints
A rubber expansion joint is a flexible connector fabricated of natural or synthetic elastomers and fabrics and , if necessary, metallic reinforcements to provide stress relief in piping systems due to thermal and mechanical vibrations and/or movements.
Noteworthy performance features include flexibility and concurrent movements in either single or multiple arch type construction, isolation of vibration and noise resistance to abrasion and chemical erosion.
Engineers can solve anticipated problems of vibration, noise, shock, corrosion, abrasion, stresses, and space by incorporating rubber expansion joints into designed piping systems.
B.1. Reduce Vibration. Rubber expansion joints isolate or reduce vibration caused by equipment. Some equipment requires more vibration control than others. Reciprocating pumps and compressors, for example, generate greater unbalanced forces that centrifugal equipment. However, rubber pipe and expansion joints dampen undesirable disturbances including harmonic overtones and vibrations caused by centrifugal pump and fan blade frequency. This is based on actual tests conducted by nationally recognized independent testing laboratory. Rubber expansion joints reduce transmission of vibration and protect equipment from the adverse effects of vibration.
B.2. Dampen Sound Transmission. Subsequent to going on stream, normal wear, corrosion, abrasion and erosion eventually bring about imbalance in motive equipment, generating undesirable noises transmitted to occupied areas. Rubber expansion joints tend to dampen transmission of sound because of the steel-rubber interface of joints and mating flanges. Thick-wall rubber expansion joints, compared with their metallic counterparts, reduce considerably the transmission of sound.
B.3. Compensate Lateral, Torsional and Angular Movements. Pumps, compressors, fans, piping and related equipment move out of alignment due to wear, load stresses, relaxation and settling of supporting foundations. Rubber expansion joints compensate for lateral, torsional and angular movements- preventing damage and undue downtime of plant operations.
B.4. Compensate Axial Movements. Expansion and contraction movements due to thermal changes or hydraulic surge effects are compensated for with strategically located rubber expansion joints. They act as helix springs, compensating for axial movements.
The industry has allied itself with designers, architects, contractors and erectors in designing and fabricating rubber expansion joints under rigid standards to meet present-day operating conditions. The industry has kept abreast of the technological advances in rubber compounding and synthetic fabrics to provide rubber expansion joints having advantages not available in other materials.
C.1. Minimal Face-To-Face Dimensions. Minimal face-to-face dimensions in rubber expansion joints offer untold economies compared with expansion bends or loops. The relative cost of the pipe itself may be less or no more than a rubber expansion joint; however, total costs are higher when considering plant space, installation labor, supports and pressure drops.
C.2. Lightweight. Rubber Expansion joints are relatively light in weight, requiring no special handling equipment to position, contributing to lower installation labor costs.
C.3. Low Movement Forces Required. The inherent flexibility of rubber expansion joints permits almost unlimited flexing to recover from imposed movements, requiring relatively less force to move, thus preventing damage to motive equipment.
C.4. Reduced Fatigue Factor. The inherent characteristics of natural and synthetic elastomers are not subject to fatigue breakdown or embrittlement and prevent any electrolytic action because of the steel-rubber interface of joints and mating flanges.
C.5. Reduced Heat Loss. Rubber expansion joints reduce heat loss, giving long maintenance-free service. The added piping required for loops contribute to higher operating costs after going on stream due to increase in heat losses.
C.6. Corrosion, Erosion Resistant. A wide variety of natural, synthetic and special purpose elastomers and fabrics are available to the industry. Materials are treated and combined to meet a wide range of practical pressure/temperature operating conditions, corrosive attack, abrasion and erosion. Standard and special sizes of rubber expansion joints are available with TFE/FEP liners, fabricated to the configurations of the joint body, as added insurance against corrosive attack. Teflon possesses unusual and unique characteristics of thermal stability, non-sticking surface, extremely low co-efficient of friction and resistance to practically all corrosive fluids and forms of chemical attack.
C.7. No Gaskets. Elastomeric expansion joints are supplied with flanges of vulcanized rubber and fabric integrated with the tube, making the use of gaskets unnecessary. The sealing surfaces of the expansion joint equalize uneven surfaces of the pipe flange to provide a fluid and gas-tight seal. A ring gasket may be required for raised face flanges. Consult manufacturer about specific applications.