Expansion Joints / Bellows Design
Basics of Expansion Joints design
Expansion Joints are designed based on following parameters.
1. Material
2. Movement - Axial/lateral/Angular/Vibration
3. Temperature - Operating and Design
4. Pressure - Operating and Design
5. Spring Rate - Axial/lateral/Angular
6. Media
7. End Fittings
Expansion Joints Manufacturers Association (EJMA)
1. Currently EJMA version 10
2. Parameters entered
I. Material
II. Movement - Axial/lateral/Angular/Vibration
III. Temperature - Operating and Design
IV. Pressure - Operating and Design
V. Pitch and Depth.
VI. Sheet thickness and No. of plys.
VII. No. of convolutions
3. Cycle Life
Types of movements covered in Bellows Expansion Joints design.
Axial:
• Centerline remains in its original position.
• Expansion joint length increases/decreases only in in the direction of centerline
Lateral:
• Centerline moves at a certain degree with respect to its original position
• Flange faces stay parallel to each other
Angular :
• Centerline creates an arc while the flanges create angle to each other.
• Expansion joint length increases/decreases as per the curvature of arc
Torsional :
• The flange/bellow movement rotates in opposite direction with respect to each other.
• Flange faces stay parallel to each other.
• Expansion joints are not designed for these movements.
Vibrations:
Sample design sheet
Vibrations:
Products & Services
- Metal Bellows
- Metal Expansion Joints
- Bellows Couplings
- Valve Bellows
- Pressure Switch Bellows
- Axial Expansion Joints
- Lateral Expansion Joints
- Hinged Expansion Joints
- Universal Expansion Joints
- Gimbal Expansion Joints
- Inline Pressure Balanced Expansion Joints
- Elbow Pressure Balanced Expansion Joints
- Cummins Engine Bellows
- Expansion Joints for Defense
Address
- Phone:
- + 91 - 70289 97949
- Phone:
- + 91 - 98904 54224
- Phone:
- + 91 - 98909 77244
- Address: Final plot no.38/1 Ramtekdi Industrial Estate, Hadapsar, Pune - 411013, Maharashtra, India
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