Cathodic protection continued interaction

Interaction tests should be made on all unprotected structures in the vicinity of a proposed cathodic protection installation, and should be repeated annually or at some other suitable interval to ensure that alterations in the layout of plant or in the electrical conditions are taken into account. It is most convenient if the tests on all unprotected pipes or cables are made at the same time, the potential measurements being synchronised with the regular switching on and off of the protection current. It may then be convenient to continue with further tests to confirm that any remedial measures applied to one installation do not adversely affect other installations. 

The anticorrosion protection of offshore platforms subjected to difficult operating conditions is an especially responsible task. Apart from the continuous strongly corrosive interaction of sea water, periodical phenomena are also encountered, such as storms, earthquakes, hurricanes, pressure of ice floats, and other phenomena increasing the corrosion hazard. These interactions cause stress and fatigue corrosion and other forms of corrosion attack. In such conditions, special protective coating systems are applied to protect the objects, coupled with cathodic protection realized by the use of sacrificial anodes or an external power sup-... 

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