Abstract

This paper discusses several subjects with respect to the burial of pipelines and transmission lines in particular and the design and pipelines and transmission lines in particular and the design and construction of bottom and scour protections for offshore structures in general.

Possible incidents with pipeline and cables during installation, burying, Possible incidents with pipeline and cables during installation, burying, testing and operation are discussed as well as the environmental impact of these incidents and of burial operations. Alternative methods of protection cq. stabilization of pipelines, cables and offshore structures, using specially designed stone-dumping vessels and mattress-sinking techniques presented. presented

Introduction

The safety assessment of offshore structures, submarine pipelines and cables is becoming an important tool in the decision-making process of Government agencies and pipeline or cable operators.

Most Government agencies do have trenching and burial cq. covering requirements. Although they vary very significantly and are continuously changing, nobody doubts the importance of such regulation nowadays.

More and more pipelines and cables are laid on seabottoms all over the world and so as a result the chance of damaging a pipeline or cable is continuously increasing.

Damage of a pipeline or cable can result in:

  1. The release of the contents of the pipeline causing very serious environmental impact.

  2. Very high repair costs.

  3. A loss of income in the period between the accident and the final repair.

  4. A shorter lifetime of the pipeline or cable.

p. 9–35 p. 9–35

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