Evaluate the total system thoroughly to specify the life of the Expansion Joint in terms of cycles, while preparing the specifications.
This is based on different modes of plant operation.
If the Plant operates at different modes with varying operating conditions, the cyclic requirements based on each operating conditions should be specified.
If the specified data is based only on Normal Operating Conditions then any Bellows designer will consider only these data for design. In actual system operation the Bellows Expansion Joints imposed with different modes of varying operating conditions will prematurely fail.