Externally-Pressurized Expansion Joints are Designed to Replace: High-Maintenance Packed JointsSpace-Confining Pipe LoopsCostly Equalizing Expansion Joints Externally PressurizedMULTI-PLY SAFETY FACTORS - In a critical application, a multi-ply expansion joint can, in most cases, preclude a catastrophic failure. If a failure occurs in one ply due to corrosion or fatigue, the intact plies will work as a protective barrier to contain the pressure and the medium until a replacement can be made. Flex-Weld multi-ply expansion joints are designed to provide utmost safety in the event of system failure. The burst pressures are a multiple of the operating pressure making the Flex-Weld multi-ply bellows the most reliable component in the system.