Igc code and gc code difference ?

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FOLLOW

The three Gas carrier codes
The year of build of a vessel will determine which code applies.

ICG code: The International Code of the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk GC Code- 1986
GC Code: Code for the Construction Equipment of Ships Carrying Liquefied Gases in Bulk-1983
EGC Code: Code for Existing Ships Carrying Liquefied Gases in Bulk-1976