Reinforced Metal Expansion Joints
Reinforced Expansion Joints are designed for high-pressure applications where standard bellows are not sufficient. Reinforcement is applied using rings or rods placed between the convolutions to strengthen the bellows against internal pressure while maintaining flexibility.
Ring Reinforcement
Ring Reinforced Expansion Joints use external rings to support the bellows structure. These rings absorb circumferential (hoop) stresses, allowing the bellows to maintain a thin, flexible wall for movement while with standing high internal pressure. By supporting a multi-layered bellows with ring reinforcement, an optimal balance of pressure integrity and service life is achieved.
Rod Reinforcement
Rod Reinforced Expansion Joints use internal or external rods between convolutions to limit deformation and enhance structural strength. Rods are often used where space or geometry constraints prevent the use of external rings.
Provides localized reinforcement at specific stress points
• Suitable for compact or non-standard configurations
• Allows pressure resistance with more tailored stiffness
• Rods can be added in various orientations depending on movement and loading
At LSI-MECH, we design both ring and rod reinforced bellows using advanced tools like FEA and conduct all required testing in-house, including for extreme pressures up to 320 bar(g) and full vacuum conditions.
Applications such as pressure vessels, heat exchangers, and other high-pressure systems typically require rod- or ring-reinforced expansion joints to ensure safety, structural integrity, and long service life under demanding conditions.
LSI-MECH hold both the ASME U and U2 stamps, demonstrating our unmatched capability in designing and fabricating high-pressure expansion joints, pressure vessels, heat exchangers, and other high-pressure equipment in full compliance with the ASME Boiler and Pressure Vessel Code.