Abstract: Whether the oil-water interface level gauge of the electrostatic dehydrator can accurately reflect the real-time liquid level inside the tank has a decisive impact on the oil-water separation effect of the electrostatic dehydrator， ultimately affecting the lower compartment water content of crude oil. This article conducts an in-depth analysis of the sticking problem of the electrostatic dehydrator level gauge in the sequence one of the “Offshore Oil 111” FPSO， and explores the reasons for sticking and improvement measures. Research has shown that by changing the flushing cycle of the electrostatic dehydrator level gauge and installing an extension tube to increase the height of the lower drainage port by about 15cm， the frequency of jamming has been successfully reduced to no more than 6 times per quarter， significantly improving the reliability of the equipment， effectively reducing the daily workload of on-site personnel， and improving work efficiency.

Key words: electrostatic dehydrator, magnetic flap level gauge, stuck problem, cause analysis