海底管道腐蚀防护状态检测方法

目的介绍一种海底管道腐蚀防护状态的非接触式检测方法,验证基于远地参比电极电位差测量的海底管道腐蚀防护状态检测方法的可行性。方法论述基于远地参比电极电位差测量的非接触式检测方法的原理,并应用数值模拟软件模拟计算964.6 m长的海底管道的电位,分析5种不同工况下埋深海底管道的整体电位在200 m水深范围内的分布规律。结果海底管道中的有效牺牲阳极分布越均匀,距离管道越远,管道整体电位分布越一致,基于该方法的管道保护电位检测越精确。管道腐蚀防护层破损越严重,牺牲阳极状态可检测性越好。结论处于设计寿命末期的海底管道周围环境电场梯度较大,这为基于远地参比电极电位差测量的非接触式检测方法提供了理论依据,证实了远参比电极电位检测法的有效性。

A Detection Method for Corrosion Prevention Status of Submarine Pipelines

A non-contact detection method for the corrosion protection status of submarine pipelines is introduced,and the feasibility of this detection method based on the measurement of the remote reference electrode potential difference is verified.The principle of the non-contact detection method based on the measurement of the remote reference electrode potential difference is discussed,the potential of the 964.6 m long submarine pipelines is simulated and calculated by the numerical simulation software,and the distribution law of the overall potential of the submarine pipelines buried within 200 m water depth under 5 different working conditions is analyzed.The more uniform the distribution of the effective sacrificial anodes in the submarine pipelines is and the farther they are away from the pipelines,the more consistent the overall potential distribution of the pipelines is and the more accurate the pipeline protection potential detection based on this method is;the more seriously the pipeline corrosion protection layer is damaged,the better the detectability of the sacrificial anodes is.The environmental electric field gradient around the submarine pipelines at the end of their design life is large,which provides a theoretical basis for the non-contact detection method based on the measurement of the remote reference electrode potential difference and confirms the effectiveness of this detection method.