The 100mV cathodic polarization criterion is being used more extensively on piping in the oil and gas industry which has prompted a discussion on the limits of its use. This paper summarizes the technical literature on the validity of this criterion with respect to elevated […]
The paper describes the theoretical and practical aspects of merging two Indirect inspection tools (i.e. Close Interval Potential Survey and DC Voltage Gradient) into one integrated survey, as used in 2004 during an ECDA project covering more than 21 Km of gas pipelines in Southern […]
Under an Integrity Management Program (IMP) for natural gas transmission lines, the ECDA concept was analyzed and the process was validated from 2002 to 2004. A Plan was developed and implemented in 2004 on one 17 km pipeline and segments of two other pipelines. This […]
Although cathodically protected pipelines are often connected directly to electrical ground in stations and plants, there is little information on the amount of current required to polarize various grounding materials such as copper, tinned copper, stainless steel, silicon iron, and galvanized steel. This paper presents […]
Two leaks were found on a recently installed (1999) pipeline which was coated with extruded polyethylene and protected with directly connected magnesium anodes. This paper describes the use of external corrosion direct assessment (ECDA) principles to identify locations where corrosion could pose a threat to […]
Some recent papers contain inaccurate information regarding the validity of the -850 mVcsE current applied criterion, the so-called on-potential criterion. To qualify as a corrosion control criterion the -850 mVcsE value must imply a sound engineering judgment of the corrosion rate. Only the -850 mVcsE […]
An effective In-line Inspection (ILI) program must provide a prioritized excavation response plan to address anomalies identified as being of particular concern. Locations that show potential for imminent or short term failure are prioritized under Phase 1 and Phase 2 responses respectively. Anomalies that could […]
Methods of determining the coating quality on directionally drilled pipe sections were investigated in a research project sponsored by the Pipeline Research Committee of the American Gas Association. Tests were conducted on FBE coated pipe samples which were buried in three different soil conditions and […]
Literature dating back to the early 1960’s has shown that AC current can cause corrosion of cathodically protected steel under laboratory conditions. Until recently however, there has been little evidence to suggest that AC corrosion of cathodically protected structures may be of practical concern. In […]
This paper presents the issues considered during the design of an impressed current type cathodic protection (ICCP) system for corrosion control on the submerged external surfaces of the steel ice shields on the piers of Confederation Bridge. General information and facts are presented on the […]
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