Abstract: Based on issues such as corrosion， weld cracking， and missing parts of the front end cover， protective plate， and coil pipe groups of thermal medium boilers， the maintenance and replacement plans， cleaning and protection measures， coil pipe welding plans， and quality control procedures during the maintenance process are designed to ensure the smooth progress of the maintenance work for offshore thermal medium boiler coil pipes to the greatest extent and contribute to safe production， cost reduction， and efficiency improvement.

Key words: offshore facilities, thermal medium boilers, coil pipes, maintenance