The purpose of this Marine Advisory is to provide information to shipowners, operators, classification societies, and masters regarding the procedures for changing cargo tank relief valve pressure settings on liquified gas carriers certified to the 1993 IGC Code.
In accordance with chapter 8.2.7 of the 1993 IGC Code, the changing of the set pressure of cargo tank relief valves under the provisions of chapter 8.2.6 and the corresponding resetting of the alarms referred to in chapter 13.4.1, should be carried out under the supervision of the master in accordance with procedures approved by Administration and specified in the ship's operating manual.
The 1993 IGC Code does not require the Liquified Gas Carrier Operating Manual to be approved by the Administration or an authorized recognized organization.
Where the ship’s operating manual is not approved in accordance with reference (b), procedures for changing set pressure of cargo tank relief valves and the corresponding resetting of the alarms approved by an authorized recognized organization at the new-building stage should be available on board and included in the operating manual.
If the approved procedures from the new-building stage are not available on board, the procedures should be reviewed and approved by the Administration or an authorized recognized organization.