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The core function of the cargo ESD system is to stop the flow of the cargo liquid/vapor in case of an emergency in order to bring the whole cargo handling system to a safe static condition. The present document released by SIGTTO was prepared to cover the emergency shutdown system arrangements for the gas carriers. The book has been arranged in three parts; the first part of the booklet covers the philosophy and some general requirements. the second part addresses the functions of the emergency shutdown system and associated safety systems. Finally, the last part of the book deals with the linked ESD systems. There are several appendices at the end of the book providing some useful supplementary information such as one on ESD processing, pneumatic ESD links, IGC Code requirements applicable to the ESD systems, and others. The publication was released due to the numerous concerns raised by the members of the organization about the interpretations of the functional requirements and is intended to encourage and promote the use of the linked systems; however, note that it shall not be treated as the technical specification for the ESD system design, it rather sets out the most important requirements to such systems...