News Information

Recently, the Third Refining Department of Guangdong Petrochemical Company successfully overcame the persistent problem of excessive vibration of the P-0102B motor, a core equipment of the hydrocracking unit, through independent technological research and development. The vibration value at the non-drive end was reduced from 118μm to 38μm, and all parameter indicators were better than the manufacturer's requirements. This completely eliminated the operational hazard and saved nearly one million yuan in equipment replacement costs.

The feed pump is a core and key equipment in the hydrocracking unit, and the problem of excessive motor vibration has a long history. Since June 2023, the vibration value of VI-7105BY at the non-drive end of the pump motor has frequently exceeded the limit and fluctuated, posing a significant risk of bearing bush burning and rotor scraping. Despite multiple inspections and coordination with the manufacturer for handling the issue, and even facing the dilemma of no spare pump running for 20 days after returning to the factory for maintenance and the high cost of a million yuan for replacement, the problem has never been fundamentally resolved.

"If the problem occurs on the spot, solve it on the spot!" In February this year, Gao Renpeng, the manager of the Third Refining Department, took the lead in establishing a special task force to conduct a comprehensive "physical examination" of the equipment. The technical team, by analyzing the operation and maintenance data and combining it with the monitoring conclusion of Lanzhou Weida, precisely identified the crux of the problem: the wear of the main motor bearing bush and the excessive original installation clearance. After disassembly inspection, it was found that the Babbitt alloy layer of the lower bearing bush at the non-driven end had undergone fatigue spalling, and the clearance at both ends of the bearing bush exceeded the upper limit of 0.25mm as stipulated.

The research team innovatively adopted a "fine clearance control" scheme, adjusting the bearing bush clearance from the upper limit to near the lower limit and simultaneously replacing the damaged bearing bushes. With the joint efforts of all participants and the strong support of the maintenance and operation department, after multiple measurements and adjustments to the bearing bush clearance, as well as multiple single-machine and load tests of the motor, the vibration values at both ends of the shaft of a section of the feed pump motor were significantly reduced during the final trial operation period, fully meeting the requirements of the manufacturer and regulations, and reaching the condition of being in good standby condition.

This is equivalent to providing double insurance for high-risk equipment. Sun Zhongxin, an equipment engineer from the Third Refining Department, said that this independent research and development not only avoided the risk of operating without a spare pump but also explored the technical specifications for precise assembly, providing a new model for the maintenance and repair of similar equipment. According to statistics, this plan shortens the construction period by 16 days compared with returning to the factory for maintenance.