Investigation and Protection of Corrosion Under Insulation of Overhead Pipeline in Marine Atmospheric Environment
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Abstract
Through field investigation on the corrosion status of typical parts of overhead oil pipelines under insulation layer in marine atmosphere, it was found that significant localized corrosion occurred at the junction of oil collecting pipe and exhaust valve, the junction of section pipe, the weld area, and the bottom of pipe support. The XPS and XRD analysis results of 6 corrosion product samples at typical sites showed that the main components were Fe2O3 and Fe3O4. Oceanic water vapor at the connection of overhead pipelines was easy to enter. Factors such as uneven electrolyte thickness, coating damage, and surface temperature differences could cause localized corrosion of the pipeline under insulation. A comprehensive corrosion control and maintenance strategy was proposed for different parts of the overhead pipelines, including the recommended methods for corrosion protection under the insulation layer of the overhead pipelines, and the corrosion inspection and monitoring projects to effectively control the corrosion of overhead crude oil pipelines. So as to ensure the integrity and integrity of the system, and to improve production safety.
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