Microbiologically Influenced Corrosion of Gulf of Mexico Mooring Chain at 6,000 Feet Depths

2012 ◽  
Author(s):  
Jonathon D. Miller ◽  
Brett J. Warren ◽  
Luc G. Chabot
Keyword(s):  
Gulf Of Mexico ◽  
Steel Structures ◽  
Microbiologically Influenced Corrosion ◽  
Mooring System ◽  
Ambient Conditions ◽  
Sulfate Reducing ◽  
Hypoxic Environment ◽  
Reducing Bacteria ◽  
Mooring Chain ◽  
Water Depths

During a post-installation inspection of a polyester and chain mooring system in water depths of approximately 6,000 ft, evidence of microbiologically influenced corrosion (MIC) was found in the form of rust tubercles known as rusticles. These porous concretions commonly form on submerged steel shipwrecks and provide evidence that subsea corrosion occurs in a hypoxic environment. Iron and sulfate-reducing bacteria cause corrosion in marine environments. This paper will discuss one form of MIC found on submerged steel structures, analyze the ambient conditions required for MIC to occur, and compare rusticles found during the mooring inspection to those found on other subsea shipwrecks such as the RMS Titanic. An analysis of the type of iron used in mooring chains and the rate of rusticle formation will be presented. Possible remedies to prevent rusticle growth on mooring chains will be summarized.

scholarly journals Effect of Sulfate-Reducing Bacteria (SRB) on the Corrosion of Buried Pipe Steel in Acidic Soil Solution

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 625
Author(s):  
Lijuan Chen ◽  
Bo Wei ◽  
Xianghong Xu
Keyword(s):  
Soil Solution ◽  
Steel Surface ◽  
Pipeline Steel ◽  
Electrochemical Techniques ◽  
Sulfate Reducing Bacteria ◽  
Acidic Soil ◽  
Microbiologically Influenced Corrosion ◽  
Soil Environment ◽  
Sulfate Reducing ◽  
Reducing Bacteria

The influence of sulfate-reducing bacteria (SRB) on the corrosion behaviors of X80 pipeline steel was investigated in a soil environment by electrochemical techniques and surface analysis. It was found that SRB grew well in the acidic soil environment and further attached to the coupon surface, resulting in microbiologically influenced corrosion (MIC) of the steel. The corrosion process of X80 steel was significantly affected by the SRB biofilm on the steel surface. Steel corrosion was inhibited by the highly bioactive SRB biofilm at the early stage of the experiment, while SRB can accelerate the corrosion of steel at the later stage of the experiment. The steel surface suffered severe pitting corrosion in the SRB-containing soil solution.

Disinfection of Sulfate Reducing Bacteria using Ultraviolet Treatment in Mitigating Microbiologically Influenced Corrosion

2014 ◽  
Vol 14 (5) ◽  
pp. 349-354 ◽  
Author(s):  
Akrima Abu Bakar ◽  
Norhazilan Noor ◽  
Nordin Yahaya ◽  
Rosilawati Mohd Rasol ◽  
Muhammad Khairool Fahmy ◽  
...  
Keyword(s):  
Sulfate Reducing Bacteria ◽  
Microbiologically Influenced Corrosion ◽  
Sulfate Reducing ◽  
Ultraviolet Treatment ◽  
Reducing Bacteria

Microbiologically Influenced Corrosion of Stainless Steel by Sulfate Reducing Bacteria: A Tale of Caution

CORROSION ◽  
10.5006/3467 ◽  
2020 ◽  
Vol 76 (7) ◽  
pp. 639-653
Author(s):  
M.A. Javed ◽  
W.C. Neil ◽  
G. McAdam ◽  
J.W. Moreau ◽  
S.A. Wade
Keyword(s):  
Stainless Steel ◽  
Sulfate Reducing Bacteria ◽  
Microbiologically Influenced Corrosion ◽  
304 Stainless Steel ◽  
General Corrosion ◽  
Care Needs ◽  
Sulfate Reducing ◽  
Test Conditions ◽  
Significant Difference ◽  
Reducing Bacteria

The influence of different experimental media composition and air purging on the potential for microbiologically influenced corrosion (MIC) of Type 304 stainless steel with sulfate-reducing bacteria (SRB) was investigated. Modified Baar’s (MB) medium, MB medium without iron ions and supplemented with sodium chloride (MBN), and air purged MBN medium (MBO) were used. Pitting corrosion attack was found on the surface of the coupons for all of the conditions tested including the abiotic tests, and detailed statistical analysis showed no significant difference between the pitting results. General corrosion and maximum pit penetration rates also showed no difference between the coupons exposed to different test conditions. Interestingly, the pits found on the surface of the coupons in all of the tested conditions were comparable in size/shape and depth to that of the inclusions present on the surface of the stainless steel coupons. These findings suggest that (i) the test conditions studied do not lead to increased corrosion rates of stainless steel with SRBs and (ii) care needs to be taken to avoid the pitfall of misinterpreting the corrosion of inclusions present on the surface of stainless steels, which can occur as a result of cleaning of the coupons, as MIC pits.

Formation of Vivianite During Microbiologically Influenced Corrosion of Steels

1993 ◽  
Vol 333 ◽  
Author(s):  
Michael McNeil ◽  
Jennifer McKay
Keyword(s):  
Nuclear Waste ◽  
High Strength ◽  
Sulfate Reducing Bacteria ◽  
Green Rust ◽  
Microbiologically Influenced Corrosion ◽  
Significant Alteration ◽  
Sulfate Reducing ◽  
Hsla Steels ◽  
Oxygenated Water ◽  
Reducing Bacteria

Abstract:Exposure of carbon and HY-80 high strength low alloy (HSLA) steels to anaerobic Postgate cultures containing sulfate reducing bacteria leads to production of mackinawite, Fe9S8, and vivianite, Fe3(PO4)2.8H2O, with minor amounts of other minerals, the vivianite being sometimes accompanied by siderite, FeCO3. The vivianite and mackinawite persist on exposure to air or oxygenated water. Green rust is a significant alteration product on some steels. The implications of these findings are discussed in light of present and possible future nuclear waste containers.

scholarly journals Comparison of 304 SS, 2205 SS, and 410 SS Corrosion by Sulfate-Reducing Desulfovibrio ferrophilus

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Junlei Wang ◽  
Hongfang Liu ◽  
Pruch Kijkla ◽  
Sith Kumseranee ◽  
Suchada Punpruk ◽  
...  
Keyword(s):  
Weight Loss ◽  
Microbiologically Influenced Corrosion ◽  
Significant Weight Loss ◽  
Electrochemical Tests ◽  
Sulfate Reducing ◽  
Large Weight Loss ◽  
Stainless Steel 304 ◽  
Corrosion Behaviors ◽  
Pit Depth ◽  
Reducing Bacteria

Three types of stainless steel (304 SS, 410 SS, and 2205 SS) were evaluated for their corrosion behaviors in microbiologically influenced corrosion (MIC) by Desulfovibrio ferrophilus strain IS5, a relatively new and very corrosive sulfate-reducing bacteria (SRB) strain. The incubation lasted for 7 days in enriched artificial seawater at 28°C and the results showed that 410 SS had a rather large weight loss (6.2 mg/cm2) and a maximum pit depth (118 µm), but 2205 SS and 304 SS did not suffer from significant weight loss or pitting. Electrochemical tests indicated that 2205 SS was slightly more resistant to SRB MIC than 304 SS, while 410 SS was far less resistant.

Identification and Phylogenetic Analysis of New Sulfate-Reducing Bacteria Isolated from Oilfield Samples

2009 ◽  
Vol 64 (3-4) ◽  
pp. 260-266
Author(s):  
Wu Chen ◽  
Fu Xiang ◽  
Jie Fu ◽  
Qiang Wang ◽  
Wenjun Wang ◽  
...  
Keyword(s):  
Water System ◽  
Optimal Growth ◽  
Sulfate Reducing Bacteria ◽  
Microbiologically Influenced Corrosion ◽  
Sulfate Reducing ◽  
Rdna Sequences ◽  
16S Rdna Sequences ◽  
Injection Water ◽  
Ph Range ◽  
Reducing Bacteria

Microbiologically influenced corrosion (MIC) caused by sulfate-reducing bacteria (SRB) has been investigated in an oilfield injection water system. Strain CW-01 was isolated from an oilfield and strain CW-04 was isolated from biofilm dirt of pipeline walls. The strains were facultative anaerobes, non-motile, Gram-positive, pole flagellum, and spore-forming curved rods. The growth was observed over the temperature range 20-70 °C. Strain CW-01 grew optimally at 37 °C. The pH range for growth was 3.0-11, optimal at pH 6.0. Strain CW-04 grew optimally at 48 °C. The pH range for growth was 3.0-10, optimal at pH 7.2. The strains grew at a very broad range of salt concentrations. Optimal growth was observed with 1.5 g/L NaCl for strain CW-01 and 0.7 g/L NaCl for strain CW-04. The strains showed most similarity in physiological characteristics, except for acetone and saccharose. Analysis of the 16S rDNA sequences allowed strains CW-01 and CW-04 to be classified into the genus Desulfotomaculum. The corrosion speciality of the strains had been comparatively investigated. Especially SRB’s growth curve, bearable oxygen capability, drug fastness and corrosion rate had been analyzed. The results showed that it is difficult to prevent bacterial corrosion caused by these two strains.

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