ABSTRACT

Telluric currents due to geomagnetic field variations have long been known to cause variations in pipe-to-soil potentials (PSP) on pipelines. These are increasingly being taken into account in the design of cathodic protection systems for new pipelines. Online services are available for modelling telluric currents but cannot handle all pipeline configurations. This paper describes the development of a new telluric simulator, based on a more versatile modeling technique that can include more details of a pipeline such as branches and other features. This can show the pipe-to-soil potentials produced by specified telluric electric fields. Descriptions are also provided for features of the telluric simulator that allow modeling of the pipeline response using electric fields calculated for past geomagnetic disturbances. These features allow pipeline designs to be checked under realistic conditions and modifications to the design to be tested.

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