Metallic expansion bellows

About Metallic expansion bellows

Metallic Expansion Bellows are flexible components made of thinwalled metallic material formed into convolutions to absorb thermal expansion vibration and movement in piping systems ducts and vessels They are widely used in highpressure hightemperature and corrosive environments such as refineries power plants and chemical processing

What Does a Metallic Expansion Bellows Contain

• Bellows Element Core Component
• Made of stainless steel or highalloy metals Inconel Hastelloy Monel
• Corrugated convoluted design provides the required flexibility to absorb
• Axial movement compressionextension along the axis
• Lateral movement offset
• Angular rotation

End Connections

• Weld Ends or Flanges to connect with the pipeline or equipment

Internal Accessories Optional

• Inner Sleeve Flow Liner Protects bellows from fluid turbulence erosion and highvelocity media
• Insulation Liner For hightemperature services to prevent heat transfer to bellows material

External Accessories Optional

• Outer Cover Shroud Shields bellows from external mechanical damage and environment
• Tie Rods Limit Rods Control pressure thrust and prevent overextension or compression
• Hinges Gimbals For controlled angular movements in special designs

Features Characteristics

• Material Stainless steel SS 304 316 321 Alloy steel or highperformance alloys

Operating Range

• Temperature Up to 1000C depending on material
• Pressure Highpressure ratings possible with reinforced design
• Movements Absorbs axial lateral and angular depending on design type
• Corrosion Fatigue Resistance Designed for repeated thermal cycles

Types of Metallic Expansion Bellows

• Single Axial Bellows For axial expansion and contraction only
• Universal Bellows Two bellows with a center spool for lateral movement
• Hinged Bellows Angular rotation in one plane
• Gimbal Bellows Angular rotation in multiple planes
• Pressure Balanced Bellows Neutralizes pressure thrust while absorbing axiallateral movement

• Steam and condensate lines
• Boiler and turbine connections
• Petrochemical and refinery pipelines
• HVAC systems for thermal expansion absorption
• Highpressure process lines