Corrosion in modern paper mills accounts for 30+% of maintenance expenses. Molecular microbiological methods (MMM): • Quantitative polymerase chain reaction (qPCR) and QuantArray were employed to examine MIC at four paper mills each with unique process characteristics and construction materials in the affected areas.
This study describes a laboratory test system which was specifically developed to assess the ability of biocides to lower microbial corrosion rates. It was found that the common oilfield biocides THPS and glutaraldehyde, dosed at concentrations of 300 ppm for 4 hours weekly over 5 weeks, could reduce MIC rates from 109.7 mpy to as low as 4.3 mpy
Fusion bonded epoxy (FBE) coatings protect the underlying metal from corrosion. The lack of research on the microbial impact of pipeline coating failures leaves a significant knowledge gap. We analyzed two FBE coating samples from buried steel transmission pipelines with unusually rapid external pitting.
Corrosive biofilm formation on metal surfaces can have serious impacts. Through this proof of concept research project we established and maintained MIC biofilms for testing with various enzyme preparations. After two months of incubation in a bioreactor inoculated with a consortium of MIC microorganisms, the presence of corrosive MIC biofilms were confirmed on steel coupons.
We have identified a class of inhibitory molecules that abrogate sulfidogenesis in oilfield produced fluids. Bottle tests and laboratory-scale bioreactors to mimic field conditions, found that very low doses of two versions of this class of compounds were found to effectively prevent H2S generation.
To study the effect of repeated biocide treatments to mitigate microbiologically influenced corrosion (MIC), we used a Center for Disease Control (CDC) biofilm reactor to generate and remediate corrosive biofilms on carbon steel coupons grown from a produced water sample from a salt water disposal (SWD).
A failure in one of the de-salter relief lines of the crude distillation unit. This paper describes the probable causes and the adopted remedies for the localized corrosion observed in the insulated relief line. Circumstantial evidence and failure morphology were used in arriving at the root cause for this failure.
A three-phase production system in the North Sea was experiencing multiple leaks in the topside separation facilities. To control the microbial contamination in the system, an initial planktonic kill study was performed to select the best possible biocides to provide immediate microbial mitigation to the field.