Guidance Manual for Tanker Structures - Consolidated Edition 2025-26

Guidance Manual for Tanker Structures - 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). The guidance manual provides comprehensive guidance and information on IACS and owner's surveys, as well as on technical maintenance and repair. It includes guidance on structural defects, corrosion in tank spaces, fatigue and other survey procedures such as thickness measurement, which is important in monitoring. This consolidated edition combines in one guidance manual the various sources of information necessary for assessing the condition of the ballast tanks, cargo tanks and structure of tankers in service. While the original manual mainly addressed the conventional single hull tanker, this revision includes IACS Recommendation No. 72: Confined Space Safe Practice - Rev.4 2025 and 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 onor after 1 July 2024.