Microbiologically influenced corrosion has been attributed to the activity of sulfate reducing and acid producing bacteria. Advances in DNA isolation and sequencing have revealed that these classes of bacteria often represent only a small portion of the corrosive microbial population present in the oil and gas environment.
Copper based waterborne wood preservatives increase the corrosion of metals embedded or in contact with the treated wood. We examine wood that was in contact with corroding metal with synchrotron based X-ray fluorescence microscopy (XFM) and X-ray Absorption Near Edge Spectroscopy (XANES) to test if the proposed corrosion mechanism is correct.
Bayesian networks (BN) are useful tools for corrosion modeling. This paper is a case study demonstrating how to perform Internal Corrosion Direct Assessment (ICDA) using BN modeling with limited data. A BN model was developed for ICDA of a 50 km refined oil pipeline. Internal corrosion probability of failure along the pipeline was assessed.
Galvele introduced a new framework for localized corrosion with his seminal paper on acidification and chloride accumulation in pits & the need for a critical product of current density & pit depth to sustain this chemistry. This paper is to review the progress in these areas with a particular focus on repassivation potential.
The case study demonstrates different approaches towards what went wrong and why on pressure safety valve susceptible to MIC growth. The Eocene Sub Centre-1 Shipping Pump discharge header connected pressure safety valve (01PSV172) reported leaking from the body and POD requested Asset Integrity Division to conduct Root Cause Analysis with recommendation.
There are advantages to Post-tensioned (PT) concrete construction compared to conventional reinforcement. However, corrosion caused tendon failures have recently been reported d/t chemically and/or physically deficient grout. A predictive model has been developed that projects onset and rate of wire and strand fractures.
The concept of using physics-based models for corrosion monitoring is still new although corrosion monitoring by use of hardware coupons and probes is well recognized. This paper describes the application in downstream related to crude unit overhead and demonstrates how the monitoring concept can be used and its benefits.