APPLUS+ GROUP
around the world
Close countries panel
around the world
around the world
around the world
Close divisions panel
Industrial and environmental inspection, vendor inspection, technical assistance, non-destructive testing (NDT) and technical staffing for all type of industries.
Multidisciplinary laboratories.Testing and engineering for product development. Conformity testing and product certification. SYSTEMS CERTIFICATION.
Statutory vehicle inspection services and emission & gas testing solutions worldwide.
Design, engineering, testing and homologation services for the automotive industry worldwide.
Originally published in the 14th International Pipeline Conference, Calgary, Alberta, Canada, September 24-28, 2018
Corrosion anomalies which reduce the strength of the pipeline must be mitigated appropriately. When corrosion defects have varying morphologies it is not always simple to determine the point at which the corrosion region becomes a safety concern, particularly for complex corrosion areas where multiple corrosion anomalies may interact with one another.
Therefore, understanding how various anomalies may interact is important to determining the overall remaining strength of a pipeline under pressure. Many criteria for this spacing and how to apply the rules are recommended in the literature and have been studied either as the focus or periphery by several more, but no single criterion is provided as regulation. The task is left to the pipeline operator to choose the interaction rule for what is defined as ‘closely spaced corrosion.’ The method by which the failure pressure is calculated should be considered as varying levels of conservatism are inherent in these assessments.
Recommendations for interaction guidelines have been determined by either empirical or analytical approaches. The empirical approaches may be limited when an insufficient number and variety of pipes can be burst tested. Many analytical approaches are based upon relationships of remaining wall and simple corrosion morphologies which may not be applicable to real world corrosion. The source of the corrosion anomaly data is an important variable when selecting and applying interaction rules. In-line inspections (ILI) are the most common methods by which to obtain corrosion anomaly data, but each technology has an inherent measurement error and bias which should be considered. This paper will go into detail on each of the items discussed, present the current state of research into this subject in the industry, and will present a general recommendation for selection of an interaction criterion for corrosion features reported by ILI.
Applus+ uses first-party and third-party cookies for analytical purposes and to show you personalized advertising based on a profile drawn up based on your browsing habits (eg. visited websites). Click HERE for more information. You can accept all cookies by pressing the "Accept" button or configure or reject their use by clicking here.
They allow the operation of the website, loading media content and its security. See the cookies we store in our Cookies Policy.
They allow us to know how you interact with the website, the number of visits in the different sections and to create statistics to improve our business practices. See the cookies we store in our Cookies Policy.
Based on your behavior on the website (where you click, how long you browse, etc.) we establish parameters and a profile for you to display ads that correspond to your interests. See the cookies we store in our Cookies Policy