An improved method of analyzing a water pump lubricant filter

Water injection pumps are essential equipment for oil recovery. The normal operation of these pumps directly affects the completion of production tasks and is closely related to energy-saving efforts at the joint station. At the first oil production plant's joint station, there are a total of 6 water injection units, including 3 large D300-150 × 10A pumps rated at 2000kW and 3 high-pressure DFl20-180 × 12 pumps with a capacity of 1200kW. Over the years, failures in the lubrication system have frequently disrupted the normal operation of these pumps. On average, each pump requires more than 15 overhauls per year, with each overhaul taking over 3 days. Additionally, each repaired pump takes more than 45 days annually, resulting in significant consumption of manpower and resources. After careful analysis of the design and working principle of the lubrication system, it was identified that the main issue lay in the unreasonable structure of the lubricating oil filter. Following a comprehensive renovation, the system was reintroduced into operation, yielding remarkable results. It completely eliminated the risk of accidents and ensured stable production. **1. Existing Problems** Through observation and analysis, several issues were found with the original lubrication oil filter structure: a. Difficult to disassemble and clean. The filter gland was directly connected to the outlet line, requiring the entire filter and line to be removed during cleaning, making routine maintenance inconvenient. b. The system had multiple leakage points. c. The gland could not be properly installed due to directional pipelines, which affected the sealing and connection of the pressure gland. d. Insufficient lubricant flow. Oil entered from the bottom of the filter, leaving a small space between the filter core and the bottom, leading to inadequate oil flow and failing to meet the lubrication needs of the water pump. **2. Improvement Measures** Based on the above findings, the primary issue was the structural defect caused by the direct connection between the filter gland and the pipeline. To address this, the following improvements were implemented: a. The filter outlet was redesigned to be located at the top of the filter, separate from the filter gland. This allowed for easier cleaning without dismantling the entire lubrication line, reducing leaks and improving the gland’s ability to seal. b. The filter inlet was moved to the lower part, increasing the oil intake space and ensuring sufficient lubricant supply, thereby solving the problem of inadequate oil flow. c. A pressure ring was added to the top of the filter core, keeping it fixed during operation and ensuring consistent filtration performance. **3. Results After Implementation** The project involved minimal investment and simple modifications without major changes to the existing lubrication system. After the transformation, the filter demonstrated excellent sealing performance and was easy to maintain. Since the upgrade, frequent overhauls of the lubrication pumps have been completely avoided, significantly reducing the frequency of pump failures and ensuring the successful completion of water injection tasks. This improvement has not only enhanced operational efficiency but also contributed to cost savings and long-term reliability in the oil production process.

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