Abstract: In the production preparation stage of 800 kt/a ethylene plant, high temperature of bearing bush of low pressure cylinder occurred during the commissioning of cracking gas compressor. This phenomenon may be caused by abnormal friction, or by poor heat removal capacity due to insufficient oil. High temperature of bearing bush will cause the lubricating oil to carbonize and accumulate carbon on the bearing surface, further accelerating wear of the bearing bush, which is not conducive to the long-term operation of the compressor. The cracking gas compressor is the key equipment of the ethylene plant, and its operation determines the operation cycle of the entire plant. In order to ensure the long-term operation, it is necessary to analyze the problem comprehensively and take effective and reliable measures to reduce the bearing bush temperature.

Key words: cracking gas compressor, bearing bush, temperature, clearance, jacking oil