Anchor Handling Tug Operations - A practical guide to the operation of modern anchor handling tugs engaged in anchor handling and towing operations

This book sets out in practical and simple terms the theoretical knowledge, methods and techniques that should be used to avoid placing AHTS vessels at unnecessary risk during routine operations. It outlines the forces acting on the vessel and discusses vessel capabilities and equipment. Case studies of the Stevns Power and Bourbon Dolphin are used to illustrate the potential dangers in AHTS operations.

This book will benefit Masters and crew on AHTS vessels, as well as towmasters, rig movers, barge masters, tower foremen and shore-based personnel who utilise these vessels in anchor handling and towing duties.

Part 1 – Theory

Chapter 1 – AHTS power, thrusters, propulsion and steering

Chapter 2 – The environmental forces acting on an AHTS vessel

Chapter 3 – Controlling an AHTS vessel’s thrusters and rudders

Chapter 4 – The effect of a tow on AHTS vessel stability

Chapter 5 – Case studies

Appendix to Part 1 – Possible improvements to AHTS vessel safety

Part 2 – Practice

Chapter 1 – Introduction

Chapter 2 – Basic operational cautions – summary from Part 1

Chapter 3 – Summary of the key points of Part 2

Chapter 4 – The behaviour of AHTS class vessels when going astern

Chapter 5 – Bollard pull certification

Chapter 6 – Turning and manoeuvring modern anchor handling vessels

Chapter 7 – The AHTS design and towing operations

Chapter 8 – The dangers of very high loads during deep water anchor handling operations

Chapter 9 – The dangers of high speed manoeuvring during lay barge operations

Chapter 10 – Some operational characteristics of modern high powered AHTS type vessels

Chapter 11 – Anchor handling loads – basic data required and how to use it

Chapter 12 – Calculating anchor handling loads

Chapter 13 – Guidelines on when to start, cease and re-evaluate the safety of an anchor handling operation

Chapter 14 – Two boat anchor deployment/recovery operations – management of risk

Chapter 15 – ‘Load sharing’ mooring operations – particular risks

Chapter 16 – The responsibilities of personnel in charge of anchor handling and towing operations

Chapter 17 – Instructions to towmasters and rig movers

Chapter 18 – Ship knowledge and practical ship handling exercises

Chapter 19 – Offshore construction operations

APPENDICES

Appendix 1 – Rig move meeting pro forma

Appendix 2 – Reference documents

Appendix 3 – Tugmaster Training – A view by Captain Terry Phillips

Appendix 4 – Further reading