Oceaneering’s Electrical Isolating Joint (EIJ) isolates the cathodic protection current in a pipeline from other sources that can act as current drains. These current draining sources such as power plants, equipment, steel reinforced concrete and other grounded structures must be isolated in order to achieve and maintain adequate, reliable and economic corrosion control. The EIJ is frequently used offshore to isolate the riser from the jacket structure where a potential difference exists between the two cathodic protection systems. It may also be used to minimize galvanic action between pipelines of dissimilar metals.
The “Monoblock” style design of the EIJ is prefabricated, electrically tested and pressure tested at the factory. This type of design provides superior pressure containment and mechanical strength. Dual elastomeric seals are used to assure high quality long-term pressure integrity and mechanically, the EIJ is designed to be as strong as the pipeline.
