Specific Applications

Clamshell Bellows Expansion Joint

If a bellows is leaking or damaged, or if a bellows has to be changed with a target to having the minimum down time, this is where a clamshell should be considered.

MACOGA Clamshell bellows is the best solution when a quick and unexpected replacement of the bellow is necessary. Clamshell bellows is a two-piece bellow which is welded around the existing unit.

The bellows is split in half longitudinally in our works. The halves are match-marked to ensure the bellows halves are aligned correctly. The clamshell is fitted accurately in position. A purge gas is set up to minimize oxidizing of the weld to ensure a good quality weld. The clamshell halves are then welded back together.

Installed on top of the current bellow while the system operates.
Oversize Clamshell Installed on top of the current bellow while the system operates.
The pipe line must be shut down to install a same-size clamshell and the current bellows to be replaced is removed and discarded.
Same Size Clamshell The pipe line must be shut down to install a same-size clamshell and the current bellows to be replaced is removed and discarded.