Due to the demanding design parameters and the critical consequences following a possible failure, the expansion joints used for such applications must meet stringent demands:
The design phase is rather complex as the design must meet both requirements in the classification Society Rules (e.g. Bureau Veritas) and the International Rules for Gas Carriers (IGC Code)
Every design has to pass a burst test of 5 times the design pressure, and the fatigue life of the expansion joint must be verified
The mechanical properties of the materials used for the expansion joint must be verified through comprehensive testing, especially the strength and ductility of the materials
Every expansion joint has to pass a pressure test of 2 times the design pressure
Special requirements regarding welding procedures and consumables are also applicable
All of these tests and documentation must be witnessed and approved by a third party surveyor.
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