Guidance Manual for Tanker Structures (GMTS) Consolidated Edition 2025 26

This consolidated edition combines various sources of information on surveys, maintenance and repairs of tanker structures into one guidance manual. This information is necessary for assessing and monitoring the condition of in-service ballast tanks, cargo tanks and other tanker structures. While the original manual primarily addressed the conventional single hull tanker, this revised edition includes 'IACS Unified Requirements (UR) Survey and Certification: Z10.4 Hull Surveys of Double Hull Oil Tankers' (Rev.18 Feb 2023), where changes introduced in Rev.18 are to be uniformly applied by IACS Societies for surveys commenced on or after 1 July 2024. The guidance also includes updated information on safety and access during surveys, including the updated 'IACS Recommendation No. 72: Confined Space Safe Practice Rev.4' (Jan 2025).