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UNDERWATER REPAIR TECHNOLOGY

Underwater Repair Technology
 
 Author(s)                

John H. Nixon
 Publisher
Gulf Publishing Company
 Date
2000
 Pages
115
 Format
pdf
 Size
4.9 Mb

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   Briefly, the book is intended to provide an overview of the techniques available to the offshore industry for the joining and repair of offshore structures. Joining systems not involving the use of welding are discussed first. The associated engineering systems required for joining procedures are then discussed - pipe handling, hyperbaric chamber design and the like. The principal underwater welding techniques are then described - wet, one atmosphere and hyperbaric welding, followed by a description of the effects of environmental pressure on the various hyperbaric welding processes. To make this section of the book more comprehensible to the general reader, a brief description of each welding process as it is used in general engineering is included before the modifications required for hyperbaric applications are discussed. Finally, those joining systems not currently in use, but which show promise in the laboratory, are described, followed by some speculation relating to how underwater joining technology might develop over the next few years. For general information, appendices describing the relevant diving technology, basic oceanography and the research methods used for the development of hyperbaric welding techniques are included. Although this book describes the technology of underwater repair at all water depths, it should be recognized that the great majority of offshore repair work is carried out at relatively shallow depths, in the region intermittently covered by the water, known as the "splash zone". This is because the speed of any object dropped from the platform or an adjacent ship is highest at the water line, while wave loadings, corrosion activity and the growth rate of marine life arc all at a maximum just below the surface. In addition, the possibility of collision between shipping and the platform is also maximised at shallow depths. Thus, numerically, the majority of underwater repairs takes place at shallow depths, although the most economically and technologically significant arc in deeper water, frequently on pipelines.
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