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Application of Amendments to Gas Carrier Codes Concerning Type C Tank Loading Limits

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Application of Amendments to Gas Carrier Codes Concerning Type C Tank Loading Limits

This booklet is designed to serve as a reminder to ship owners and terminal operators of the improvements in safety codes for cargo tank loading limits that the 1998 amendments provided.

IGC Code changes have made compliance a less precise process than conforming to the original Code because the criteria for determining the lowest cargo density anticipated becomes the highest operational cargo temperature encountered. To predict this temperature requires some judgement on the part of the Shipowner and an ability to convince Administrations that the selection is reasonable.

At its 14th session in December 1984, the IMO Bulk Chemicals Sub-Committee expressed a willingness to consider amending the Codes governing cargo tank loading limits.

SIGTTO and IACS believed that for Type C tanks the Codes, in providing for certain safety features, reduced protective measures available under fire conditions or increased the risk of unwanted venting of cargo. By updating the Codes, protection could be improved.

IMO’s Marine Safety Committee at its 61st session (MSC61) agreed to change the IGC Codes and made available that protection.


MSC65 recommended to IMO’s 19th Assembly that the Guidelines be accepted. The Assembly acceded to this request clearing the way for those amendments, agreed at MSC61, to come into force on 1st July 1998.

1 Introduction
2 Changes to the Codes - What they are and what they Mean
2.1 Loading Limits - Unamended Procedures
2.2 Code Changes to Increase Protection
2.3 The New Amendments
2.4 The Effects of the New Amendments
3 Advantages Realised - A Guide to Administration Recognition
4 Recommendations
5 Summary
Appendix 1 Confirmation of Vent System Adequacy
Appendix 2 Highest Temperatures
Appendix 3 Loading Limit Assessment Method