The long-term service life outcomes were compared for similar natural gas storage wells operated with either no cathodic protection or partial cathodic protection. Cathodic protection for storage wells is not mandated by regulation and industry practice varies so the outcomes for more than 350 wells […]
Pipeline operators are becoming more dependent on coupons for demonstrating adequate cathodic protection as the use of multi-line corridors has increased. In such complex right-of-way configurations, the pipelines are often bonded together for cathodic protection purposes. The presence of widely varying coating qualities and current […]
Trenchless technologies are increasingly used to install pipelines at crossings with environmentally sensitive features, highways, etc. For deep crossings installed in rock via horizontal directional drilling (HDD), there has been concern within the pipeline industry about the effectiveness of conventional monitoring and cathodic protection techniques. […]
Techniques for telluric compensation of close-interval potential survey (CIPS) data have been known and used in the pipeline industry for many years. However, in recent years, operators have begun to question the effectiveness of surveys performed during periods of significant telluric activity and, in some […]
The ability to adequately monitor and protect long, deep trenchless crossings installed in rock is critical to ongoing safe operation of pipelines. This paper is a case study of a long horizontally directionally drilled crossing that was subject to significant coating damage at installation. The […]
Recent close-interval potential surveys have raised concerns about the accuracy of potential measurements on some older pipelines. Two significant sources of error were identified: metallic IR-drops and equalization currents. These resulted in measured on and off potentials which differed by hundreds of millivolts from the […]
In recent years, effective techniques have been developed for conducting integrity assessments along cross-country pipelines. In order to provide similar confidence in facility integrity, it was proposed to apply a modified external corrosion direct assessment process to a small station. Until now, congested facility environments […]