Year Published

First Edition


Revision Status


Witherby Seamanship


This publication uses a risk assessment method and terminology to explain the environment and define some example scenarios and response strategies.

The information in this guide is provided primarily for organisations involved in the transportation of liquefied gas cargoes, including support craft, facilities, and ships. It may also be of assistance to regulators and government agencies.

SIGTTO is of the opinion that knowledge of the design basis for facilities and gas carriers, including typical credible (design) scenarios, may assist in the improvement of existing practice. This publication therefore sets out to increase awareness of the philosophy behind the design, including the purpose and limitation, of equipment used. Appreciation of the credible scenarios should also assist the industry in carrying out more effective drills and exercises.


Suggested competency standards have been provided at Annex D to assist with the creation of training programmes for the crew of support craft.

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This publication is about the role of support craft in assisting with safe operations and emergency response for liquefied gas carriers and facilities. It looks at how the service could be improved by a more up to date approach and an improved understanding of hazards, barriers, risk scenarios and response strategies. It provides suggested competency standards to assist with the creation of training programmes for support craft crew.

This book demonstrates how risk assessment may be used to develop response and protection strategies for support craft. It considers the ‘top events’ that will typically concern operators of support craft (i.e. loss of containment, collision/grounding, loss of position, and evacuation,
rescue and pollution prevention) and discusses the threats, barriers and consequences of each event, highlighting the part that support craft can play in mitigating risk through planning and operational readiness.

The text is supported with colour illustrations and photographs, as well as diagrams showing the ‘bowtie’ method of risk assessment and management.

Annexes provide useful information on:
• Response considerations and planning
• equipment and capabilities of support craft
• water-spray systems
• support craft emergency response competencies
• fire and gas dispersion modelling.

This title incorporates A Contingency Planning and Crew Response Guide for Gas Carrier Damage at Sea and in Port Approaches, 3rd Edition (SIGTTO) and A Guide to Contingency Planning for the Gas Carrier Alongside and Within Port Limits, 2nd Edition (SIGTTO).