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The tendency of pipeline girth weld coatings to shield cathodic protection (CP) current was studied in the laboratory. Epoxy, epoxypolyurethane, polyurethane, and wax were investigated. Results showed that the liquid coatings, when applied extra thin to accelerate the kinetics of absorption and current transmission, all disbonded by blistering, and all allowed CP current to be transmitted.
The relative tendency of pipeline girth weld coatings to shield cathodic protection (CP) current was studied in the laboratory. Four types of liquid coatings: epoxy, epoxypolyurethane, polyurethane, and wax were investigated, with fusion bond epoxy (FBE) and a polyethylene shrink sleeve used for comparison. The results showed that the liquid coatings, when applied extra thin to accelerate the kinetics of absorption and current transmission, all disbonded by blistering, and all allowed CP current to be transmitted. For all coatings, micro-defects were found to be associated with the blisters, and it is believed that these defects were necessary to allow effective CP under disbonded coatings.
Key words: coating, CP shielding, EIS, blistering
The effect of seasonal changes on the protection of pipelines in high-resistivity soil. The nature and magnitude of the seasonal fluctuations. Corrosion rates are low even when compliance with a given CP criterion cannot be demonstrated.
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The transport of dissolved O2, and that of dissolved carbon dioxide (CO2) if present, into the disbonded region through holiday can be key to determining the disbonded corrosion rate. The evolution of chemistry in the disbonded region and the transient behavior of corrosion potential and rate in the disbonded region are investigated and reported in this work.
A close-interval potential (CIP) data survey on ~154 km of Crude Oil/Gas pipeline networks. This aim was to generate corrosion data to determine weak sections of the pipelines/flowlines and, to ascertain the effectiveness of the CP system and integrity of the Crude Oil/Gas pipeline networks. The pipeline networks were found safe for continued operation under its present condition.