2 Ply Testable Bellows
The bellows, as the most critical part of the Expansion Joint, can be single ply, multiply, redundant ply or reinforced.
In two ply testable bellows each ply is designed for the full operating conditions (pressure, temperature and movements). If a hole or stress crack develops in the inner ply during service, the outer ply takes over without exposing operators to increased risk or creating the need for an unscheduled shutdown.
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