Abstract: A BCL405/A type recycle hydrogen compressor is used in the 3.3 million tons/year residue oil hydrogenation unit of one domestic petrochemical company. This compressor is a vertical split centrifugal compressor. During the normal operation of the unit, malfunction of the thrust bearing temperature indicator on the nondriven end of the compressor often occurs. This paper analyzes the reasons for the malfunction of the temperature indicator from two aspects including mechanical manufacturing and design of temperature lead wire of the bearing. Aiming at the causes of indication malfunction, it proposes such measures as improving the equipment lead method, adjusting the bearing mounting clearance, and increasing the lubricating oil pressure of the thrust bearing, which have completely solved the above problems. These measures can provide reference for future routine maintenance, repair and operation of similar compressors.

Key words: centrifugal compressor, thrust bearing, temperature indication, malfunction