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EXPANSION JOINT
1. Product Overview
Expansion joints (compensators) are flexible connectors designed to absorb thermal expansion, reduce vibration, and compensate for misalignment in piping systems while maintaining pressure integrity.
Key Advantages
✔ Movement Absorption - Compensates for axial, lateral & angular displacement
✔ Vibration Damping - Reduces pipe vibration by up to 90%
✔ Stress Relief - Minimizes pipe support loads and anchor forces
✔ Maintenance-Free - No lubrication or adjustment required
2. Product Types & Construction
By Design Type
|
Type |
Movement Capability |
Max Pressure |
Applications |
|
Single Axial |
Axial: ±50mm |
PN25 |
Straight pipe runs |
|
Universal |
Axial: ±100mm, Lateral: ±50mm |
PN16 |
Complex piping layouts |
|
Hinged |
Angular: ±15° |
PN40 |
Directional changes |
|
Pressure Balanced |
Zero thrust |
PN63 |
Pump/Turbine connections |
|
Rubber Expansion |
Multi-directional |
PN10 |
Vibration isolation |
Material Options
Bellows: 304/316L SS, Inconel 625, Titanium
Liners: PTFE, Graphite, Ceramic (for abrasive media)
Covers: SS braid, Insulation jackets
End Connections: Flanged, Butt-weld, Threaded
3. Technical Specifications
|
Parameter |
Specification Range |
|
Size Range |
DN50-DN5000 (2"-200") |
|
Pressure Rating |
Vacuum to PN100 (ASME 900#) |
|
Temperature Range |
-260°C to +1200°C |
|
Cycle Life |
5,000-50,000 cycles (depends on design) |
|
Flow Velocity |
Up to 30 m/s (with flow liner) |
4. Industry-Specific Solutions
Power Plants
High-Temperature: Alloy 625 bellows with ceramic lining
Steam Systems: Pressure-balanced designs for turbine bypass
Oil & Gas
Offshore: Titanium bellows with corrosion-resistant coatings
Refineries: PTFE-lined joints for acid services
Chemical Processing
Corrosion-Resistant: Hastelloy C276 construction
Abrasive Media: Hard-faced liners (WC-Co coating)
HVAC
Low-Pressure: Rubber fabric expansion joints
Chilled Water: EPDM-coated metal bellows
5. Selection Guide
|
Application |
Recommended Type |
Critical Features |
|
Steam Lines |
Pressure-Balanced |
Thrust elimination |
|
Seawater Cooling |
Super Duplex SS |
Chloride resistance |
|
Catalytic Cracking |
Inconel 625 |
1000°C capability |
|
Compressor Piping |
Hinged |
Angular movement |
6. Standards Compliance
EJMA Standards: Expansion Joint Manufacturers Association
ASME B31.3: Process Piping Design
ISO 15348: Metallic Bellows Expansion Joints
PED 2014/68/EU: Pressure Equipment Directive
7. Quality Assurance
Dimensional Inspection: Laser measurement systems
Pressure Testing: 1.5x design pressure hydrotest
Material Certification: EN 10204 3.1/3.2
NDT: 100% PT/RT for critical joints
8. Why Choose Our Expansion Joints?
✅ Custom Engineering - CAD/FEA analysis for complex movements
✅ Extended Service Life - Up to 2x standard cycle ratings
✅ Global Certifications - CE, ASME, GOST, API
✅ Technical Support - Movement calculations & installation supervision
Request our Pipe Stress Analysis Guide or Expansion Joint Sizing Software!
EXPANSION JOINT Customer Evaluation
EXPANSION JOINT FAQ
-
What is the main function of an expansion joint?
It mainly absorbs thermal expansion and contraction, mechanical vibration and displacement in pipelines, ducts or structures to protect equipment.
-
What working temperatures can expansion joints withstand?
Different models are available for low-temperature, normal-temperature and high-temperature environments, ranging from -50℃ to over 600℃.
-
Are expansion joints suitable for both metal and non-metal pipelines?
Yes. We provide rubber, fabric and metal expansion joints for different pipeline materials and media.
-
How long is the delivery time for standard expansion joints?
Standard sizes can be shipped within 7–15 working days; customized products take 15–30 working days.
Apr 16,2026
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