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00724 CORROSION MANAGEMENT OF BURIED PIPELINES UNDER DIFFICULT OPERATIONAL AND ENVIRONMENTAL CONDITIONS

Picture for 00724 CORROSION MANAGEMENT OF BURIED PIPELINES
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Product Number: 51300-00724-SG
ISBN: 00724 2000 CP
Author: S.L. Eliassen and S.M. Hesjevik
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This paper describes the company's "best practice" for buried pipeline integrity management. All pipelines are however unique in terms of operational and environmental characteristics and the appropriate level of surveillance may vary from one pipeline system to another. Generally, the cathodic protection systems are based on automatically controlled rectifier systems with a wide range of current drainage and a comprehensive monitoring of potentials and current. The use of online monitoring of selected test posts and all rectifier units are considered essential for remote areas and in a situation where manpower is getting more expensive. This also reduces the down time of the rectifiers significantly. The technical challenges during construction and service are related to highly variable soil resistivities, very low pH marshes, AC and DC stray currents and telluric currents. A description of the approach in new pipeline projects, as well as maintenance of existing pipelines is given. Keywords: cathodic protection, integrity management, buried pipelines, online monitoring.
This paper describes the company's "best practice" for buried pipeline integrity management. All pipelines are however unique in terms of operational and environmental characteristics and the appropriate level of surveillance may vary from one pipeline system to another. Generally, the cathodic protection systems are based on automatically controlled rectifier systems with a wide range of current drainage and a comprehensive monitoring of potentials and current. The use of online monitoring of selected test posts and all rectifier units are considered essential for remote areas and in a situation where manpower is getting more expensive. This also reduces the down time of the rectifiers significantly. The technical challenges during construction and service are related to highly variable soil resistivities, very low pH marshes, AC and DC stray currents and telluric currents. A description of the approach in new pipeline projects, as well as maintenance of existing pipelines is given. Keywords: cathodic protection, integrity management, buried pipelines, online monitoring.
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