A single metal bellows element fitted with flanges or pipe weld ends and incorporating a pipe liner and an external shell. This style of joint is most suitable for applications involving movements in long piping runs with large amounts of thermal expansion. Also recommended where maximum system safety is an issue, and protection of the bellows element is essential.
The joint is externally pressurised. With an internally pressurised bellows the movement capability is restricted by the squirm pressure. When the bellows is pressurised externally it becomes pressure stabilised irrespective of the length to diameter ratio thus allowing the use of a greater bellows length at a given pressure.
Suitable for large axial movements. Standard joints have 100, 150 & 200mm of movement.
Manufactured to the guidelines laid down in the Standards of the Expansion Joint Manufacturers Association Inc. (EJMA).