Wide Arch Rubber Expansion Joints
Flexible Rubber Pipe Connectors for Movement Compensation and Vibration Isolation
Wide Arch Rubber Expansion Joints are flexible pipe connectors used to accommodate piping movement and isolate vibration in industrial fluid systems. Their wide arch profile provides a flexible section for movement, while the reinforced rubber body is selected according to operating pressure, temperature, and media requirements.
Key Features
Movement Compensation
Accommodates specified axial, lateral, and angular movements within the rated operating limits.
Vibration Isolation
Helps reduce vibration transmission from pumps, compressors, and other rotating equipment.
Reinforced Construction
Rubber compounds and fabric or metal reinforcement are selected according to the joint design and operating conditions.
Flanged Connections
Designed to connect with compatible pipeline flanges using the specified drilling pattern and sealing arrangement.
Technical Specifications
Specifications depend on nominal diameter, joint construction, reinforcement, rubber compound, and operating conditions. Confirm the available range for the required configuration before ordering.
|
Technical Parameter |
Specification / Selection |
|
Product Type |
Wide Arch Rubber Expansion Joint |
|
Nominal Diameter |
Project-specific; confirm available DN/NPS range |
|
Working Pressure |
Selected according to size and design; confirm rated pressure |
|
Operating Temperature |
Depends on rubber compound and conveyed medium |
|
Movement Capability |
Axial, lateral, and angular; confirm allowable values |
|
Vacuum Service |
Available only for designs rated for the specified vacuum condition |
|
Flange Standards |
EN 1092-1, ASME B16.5/B16.47, JIS B2220, or AS 2129, subject to design compatibility |
|
Rubber Compounds |
EPDM, NBR, CR, FKM, or other available compounds |
|
Reinforcement |
Fabric reinforcement and metal reinforcement, as applicable to the design |
|
Accessories |
Control rods, vacuum support rings, and other specified components |
Technical Note: Pressure, temperature, vacuum, and movement limits are interdependent. The selected joint must be checked against its rated specifications and installation conditions. Do not assume that every size is available in every pressure class or that every design is suitable for full vacuum.
Rubber Compound Selection
The inner rubber compound must be compatible with the conveyed medium and the actual operating conditions. The following guide supports preliminary selection only.
|
Rubber Compound |
Typical Applications |
Selection Considerations |
|
EPDM |
Water systems, HVAC, and selected outdoor applications |
Check hot-water or steam conditions, additives, and temperature limits |
|
NBR (Nitrile) |
Oil, fuel, and selected hydrocarbon-containing media |
Confirm compatibility with the specific fluid and additives |
|
CR (Neoprene) |
General industrial services and selected marine applications |
Verify seawater exposure, oils, chemicals, and temperature |
|
FKM |
Selected high-temperature and chemically demanding services |
Compatibility varies significantly by chemical and concentration |
|
PTFE-Lined Construction |
Selected chemically aggressive or high-purity services |
Confirm lining design, temperature, pressure, and joint availability |
Selection Tip: Provide the fluid name, concentration, operating temperature, working pressure, and any cleaning chemicals. Do not select a compound based on the generic material name alone.
Applications and Installation
Typical Applications
Pump and Compressor Connections: Helps isolate equipment vibration and accommodates specified piping movement.
HVAC and Cooling Systems: Accommodates movement associated with temperature changes in compatible water circuits.
Industrial and Marine Piping: Used in selected water-treatment, utility, cooling-water, and process-piping applications, subject to media compatibility.
Installation Considerations
Anchoring and Pressure Thrust: Evaluate pressure thrust, anchors, guides, and pipe supports. Control rods or limit units may be required but do not replace appropriate piping-system design.
Alignment and Movement: Install within the specified alignment and movement limits. Do not use the joint to correct major pipe misalignment unless explicitly permitted by its design.
Flange Bolting: Check flange compatibility and follow the specified bolt-tightening sequence and torque requirements.
Important: Installation requirements depend on the joint design and piping arrangement. Follow the product-specific installation instructions before commissioning.
Manufacturing and Quality Control
Manufacturing processes and inspection requirements should be confirmed for the selected product and order.
Manufacturing Options
Molding or other suitable rubber-joint manufacturing processes, depending on size, construction, and production requirements.
Dimensional Inspection
Relevant checks may include face-to-face length, flange dimensions, bolt-hole layout, and overall geometry.
Pressure and Material Verification
Testing and material checks are specified according to the product design, applicable requirements, and agreed inspection plan.
Quality Documentation
Available documents may include dimensional inspection reports, material certificates for applicable components, pressure-test reports, and installation instructions.
Inspection frequency, test pressure, acceptance criteria, and documentation should be agreed upon before production. Do not assume every test or document is included with every order.
Customization and Request for Quotation (RFQ)
Provide the following information to support product selection and quotation.
Dimensions
DN/NPS, face-to-face length, flange standard, pressure class, and flange material.
Operating Conditions
Conveyed medium, concentration, working pressure, operating temperature, and design temperature.
Movement Requirements
Axial compression/extension, lateral displacement, angular movement, and any combined movement.
Special Conditions
Vacuum level, equipment vibration, outdoor exposure, chemical cleaning, or other service requirements.
Accessories and Documents
Control rods, vacuum support rings, inspection requirements, drawings, and requested certificates.
RFQ Submission
Provide a drawing or existing joint specification where available. The final configuration should be confirmed against the operating conditions and installation arrangement.
Frequently Asked Questions
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