This paper covers various methods for dealing with sources of errors affecting the accuracy of the Direct Current Voltage Gradient (DCVG) coating defect identification and sizing tool. Topics reviewed in detail include: eliminating the influence of local soil resistivity and varying pipe depth on the […]
An AC interference study was conducted in 2015 following the installation of a new 240 kV powerline in a remote area of Alberta, Canada. The calculations indicated severe risk of AC corrosion for the paralleling pipelines and safety hazards for pipeline personnel, especially under fault […]
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 […]
The quality of the indirect inspection data is a critical factor in conducting a successful ECDA. It is therefore essential to increase the accuracy of the field data collection, to improve the data processing and to effectively present the results. This paper describes several challenges […]
When installing pipelines in rocky areas, additional mechanical safeguards may be necessary to protect the coating. These safeguards may take the form of intermittent supports which elevate the pipeline off the trench bottom. As such supports are non-metallic and are installed directly against the pipeline […]
The Maritimes and Northeast Pipeline on the east coast of North America is constructed through an area where large geomagnetic disturbances can be expected. Because of this it was decided to include consideration of telluric current effects in the design of the cathodic protection (CP) […]
This paper reports another successful application in industry of the rapidly expanding science of anodic protection. In the seven years during which this application has been under development, anodic protection has emerged from the laboratory into industry, where it is now being successfully used in […]
Monitoring the operation of Cathodic Protection (CP) systems on 39,000km (22,000 miles) of pipeline through site visits and manual reading is a time consuming and costly task. (Figure 1) Of the 1300 plus rectifies sites in the subject pipeline network, more than 40 sites are […]
Another successful application is described in this article of the rapidly expanding technique of anodic protection. This report deals with kraft digesters in pulp and paper manufacturing. In the manufacture of sulfate or kraft paper products, the first stage is reduction of wood chips to […]
Copper grounding has a detrimental effect on cathodic protection (CP) of interconnected underground carbon steel piping. The copper can consume large amounts of protection current as well as introducing significant measurement errors when verifying the protection level of the piping. This paper examines the interaction […]
Recent Comments