Seawater pipeline corrosion monitoring system based on AC impedance technology

  Objectives  The installation of an insulating spacer is an important measure to prevent electrochemical corrosion between seawater dissimilar metal pipelines. The electrical insulation performance of the insulating spacer reflects the degree of electrochemical corrosion between seawater pipelines.

  Methods  On the basis of the AC impedance technology, this paper designs and develops a system for monitoring electrical insulation performance between seawater dissimilar metal pipelines. The system mainly includes power module, microcontroller module, Direct Digital Synthesizer(DDS)signal generator and communication module, and upper computer software, and the measurement accuracy is verified with high-precision instruments.

  Results  The results show that the electrical insulation performance monitoring system has a high measurement accuracy, and the measurement error of the insulation resistance below 10 MΩ is within 5%.

  Conclusions  The electrical insulation performance monitoring system suitable for both dry and wet states is realized, which meets the actual application requirements.