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The shielding effect of wild type iron reducing bacterial flora on the corrosion of linepipe steel

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Highlights : Microbes cause significant damage in oil and gas engineering structures. 16S rRNA gene sequence indicates the presence of mixed bacterial consortium. Biotic system, confirms the presence of various oxides of Iron. IRB consortium exhibits inhibitory action on the corrosion process. Pitting was much more evident in the abiotic system than the biotic system.

More informations : The shielding effect of wild type iron reducing bacterial flora on the corrosion of linepipe steel.

Failure analysis of a pinion of the jacking system

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Experiment results showed that the superficial heat treatment of the pinion was not uniform and there was no hardened layer at the tooth root. At the same time, the hardened layer near the pitch circle had been worn out for long-term service, thus the surface hardness of the failed pinion was lower than that of the rack

More informations : Failure analysis of a pinion of the jacking system of a jack-up platform.