Proposed ECDA methodology modification by including new probabilistic and statistical analysis based on a case of study for 110km pipeline

2015 by Nace International. This is the final series of steps for the development of a modification to the direct assessment of external corrosion set by the NACE 502 SP 2010 document that includes a standard methodology. The standard includes four steps: we proposed in this modification that the first step should include the integration of dynamic behavior of macro-parameters, such as rainfall, water accumulation, chemistry of the soil, and conditions affecting the corrosivity of the soil near the metallic structure. These macro parameters will dictate the most suitable indirect measurements influencing corrosion in buried pipelines. As part of the indirect assessment analysis we filtered the field data by using statistical tools. Real-time macro-modeling in combination with indirect and in-line inspection were used to build probability and statistical models and pinpoint the highest risk areas, based on corrosion phenomenon. This work aims to provide a modified methodology based on a case study of a buried pipeline that is 110 km (68.35 miles) in length and 457.2 mm (18in) in diameter, and has the advantages of adding more analyses in the current available standard practice. The selected sites were characterized and repaired.

Proposed ECDA methodology modification by including new probabilistic and statistical analysis based on a case of study for 110km pipeline Conference Paper