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Underwater repair technology

J Nixon, Cranfield University, UK

Woodhead Publishing Series in Welding and Other Joining Technologies No. 45

This book provides an overview of the techniques available to the offshore industry for the joining and repair of offshore structures. The last few years have seen many developments in underwater engineering technology where a wide range of welding techniques, and the necessary associated equipment, are now available for underwater joining procedures in the offshore industry.

The extraction of hydrocarbons from offshore reserves is now a worldwide industry, with activity on every continent. There are huge steel and concrete structures standing in 200 metres of water, with more innovative designs, such as tethered platforms capable of operating in deeper waters, and with 1000 metre reserves currently being considered. New materials – stainless steels, duplex stainless steels, aluminium, Monel, coated materials, and non-metallic materials such as reinforced plastics are beginning to be used in significant quantities. Joining and inspection techniques have been greatly developed, and new design concepts have been brought into use.

Concentrating on repair technology the author presents a survey of the techniques available for the fabrication, repair and modification of structures underwater. His book is an important reference for those working in the international offshore engineering industry, and will also be of value to universities and training establishments offering courses on marine technology.

ISBN 1 85573 239 4
ISBN-13: 978 1 85573 239 1
April 2000
128 pages  234 x 156mm  hardback  
£100.00 / US$170.00 / €120.00

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About the author

After completing an MSc in welding technology at Cranfield Institute of Technology, John Nixon joined the Underwater Welding Group at Cranfield in 1975. He is currently Principal Research Officer at the Marine Technology Centre at Cranfield University. His main responsibility is the design and construction of specialised research welding and experimental systems for underwater welding.

His other research interests include robotic welding, welding parameter logging and analysis for underwater systems. He is a Chartered Engineer and a SenMWeldl.

Titles which may also be of interest:
Non-destructive examination of underwater welded structures
Underwater wet welding and cutting
Professional diver’s manual on wet-welding
Developments in marine corrosion
Pressure vessels

Contents

Introduction

Offshore structures, materials and standards
 - Gravity platforms
 - Jacket platforms
 - Pipelines
 - Offshore engineering materials
 - Standards and codes

The joining of underwater structures without the use of underwater welding
 - Lifting
 - Pipe connectors
 - Structural joints

Underwater engineering processes required for fabrication operations
 - Pipeline alignment systems
 - Pipe preparation
 - Inspection techniques

Underwater welding technology
 - Wet welding
 - One atmosphere welding
 - Hyperbaric welding
 - Hyperbaric welding chambers
 - Summary

Manual hyperbaric welding techniques
 - Tungsten inert gas welding(TIG)
 - Manual metal arc welding (MMA)
 - Metal inert gas welding (MIG)
 - Flux cored arc welding (FCAW)
 - Automated orbital hyperbaric welding
 - Summary

Alternatives to saturation diving for deep water applications

Deep water arc welding processes
 - Plasma welding
 - MIG welding
 - Summary

Alternatives to arc welding for deep water joining operations
 - Solid phase welding processes
 - Mechanical connectors

Conclusions

Appendices

Bibliography