In thermal power plants, centrifugal oil pumps are one of the core equipment to ensure the stable operation of steam turbine systems. When a steam turbine encounters a sudden fault such as an interruption in the lubricating oil system, the DC emergency oil pump needs to be started quickly to provide lubrication and cooling for key components. Centrifugal oil pump 125LY-23-5 is often selected as the preferred model for DC emergency oil pumps due to its efficient flow output and reliability. However, during the commissioning phase, how to scientifically record key parameters to ensure that equipment performance meets standards and avoid potential risks is a skill that operation and maintenance personnel must master.
I. Preparation before commissioning: Why is parameter recording so important?
The commissioning of centrifugal oil pump 125LY-23-5 is not only a link to verify equipment performance, but also a window to troubleshoot potential hidden dangers. In the scenario of a steam turbine DC emergency oil pump, the operating stability of the pump is directly related to the safety of the unit. For example, if the pump flow is insufficient, the turbine bearing may overheat due to insufficient lubrication; if the head is abnormal, the response speed of the oil pressure regulation system may be affected. Therefore, during the commissioning phase, systematic parameter recording is required to ensure that the equipment operates under the designed working conditions and provide data support for subsequent maintenance.
II. Key parameters to be recorded during the commissioning and their practical significance
1. Flow and head: the “dual core” of pump performance
Flow and head are the core performance indicators of the centrifugal oil pump 125LY-23-5. The outlet flow and inlet/outlet pressure difference need to be monitored in real time by the flow meter and pressure gauge to calculate the actual head. For example, if the measured outlet flow is less than 18 cubic meters/hour, it may indicate that the impeller is worn or the seal ring gap is too large; if the head is insufficient, it is necessary to check whether the pump body has cavitation or blockage.
2. Motor power and current: a barometer of load status
The power consumption of a centrifugal oil pump is closely related to the flow and head. The running current and power factor of the motor need to be recorded during the commissioning. If the starting current exceeds 10A or the running current fluctuates frequently, it may indicate that the matching between the pump and the motor is abnormal or the bearing friction is aggravated. In addition, an abnormal decrease in the power factor may reflect a decrease in motor efficiency, and winding or insulation problems need to be checked in time.
3. Bearing temperature and vibration value: “early warning signal” of mechanical status
The bearing temperature rise and vibration value of centrifugal oil pump 125LY-23-5 are important parameters for evaluating the status of mechanical seals. According to industry standards, the bearing temperature should be controlled below 70℃ and the vibration value should be less than 0.5mm/s. Continuous monitoring is required during the test run by infrared thermometer and vibration sensor. For example, if the bearing temperature rises rapidly to 85℃ after 10 minutes of operation, it may indicate insufficient grease or abnormal seal friction; if the vibration value exceeds the threshold, it is necessary to check the impeller balance or pump body installation accuracy.
4. Mechanical seal leakage: intuitive reflection of sealing performance
The mechanical seal is a key component of the centrifugal oil pump 125LY-23-5, and its leakage directly reflects the matching status of the sealing surface. During the test run, the oil leakage at the mechanical seal needs to be observed. Under normal working conditions, the leakage should be less than 5 drops/minute. If the leakage suddenly increases, it is necessary to stop the machine immediately to check the wear of the sealing ring or insufficient spring pressure. In addition, regularly recording the trend of leakage changes can provide a reference for subsequent maintenance.
5. Oil pressure and oil temperature: the “lifeline” of the lubrication system
As a DC emergency oil pump, the outlet oil pressure and oil temperature of 125LY-23-5 directly affect the lubrication effect of the turbine bearing. During the test run, it is necessary to record whether the outlet oil pressure reaches the design value and whether the oil temperature is stable in the range of 35-45℃. If the oil pressure fluctuates frequently or the oil temperature rises abnormally, it may indicate that the internal wear of the pump body is aggravated or the cooling system is faulty. For example, when the oil temperature exceeds 50℃, it is necessary to check whether the cooling water pipeline is unobstructed or whether the lubricating grease is deteriorated.
6. Startup time and no-load performance
The startup process of the centrifugal oil pump is a key link in the test run. It is necessary to record the time required for the pump to run stably from startup to stable operation, and observe whether there is any abnormal sound or vibration during no-load operation. For example, if the startup time is too long, it may indicate that the motor power is insufficient or the impeller is stuck; if there is a metal friction sound during no-load operation, it is necessary to check whether the bearing or seal is damaged.
7. System joint adjustment parameters: coordination with steam turbine
In the application of steam turbine DC emergency oil pump, centrifugal oil pump 125LY-23-5 needs to work with main oil pump, control valve and other equipment. During the test run, it is necessary to record the matching of pump outlet flow and steam turbine lubricating oil system to ensure that oil pressure fluctuations will not trigger protection shutdown. For example, by adjusting the opening of the pump outlet valve, verify whether the oil pressure can be stably adjusted within the range of 0.2-0.3MPa to meet the needs of different working conditions of the steam turbine.
III. Practical value and precautions of test run records
Test run records are not only the basis for equipment acceptance, but also the “data cornerstone” for long-term operation and maintenance. For example, by comparing the flow, head and vibration values of different batches of test runs, the stability of pump body manufacturing quality can be identified; by analyzing the historical curves of oil temperature and oil pressure, potential failures of the lubrication system can be predicted. In addition, special attention should be paid to the following matters during the test run:
- Environmental factors: Ensure that the test run environment temperature is between -20℃ and 40℃ to avoid abnormal oil viscosity caused by low temperature.
- Medium cleanliness: Check whether there are impurities in the oil. Impurity particles may accelerate the wear of the impeller and sealing ring.
- Safety protection: An emergency stop button must be set during the test run, and a dedicated person must be arranged to monitor key parameters to prevent sudden abnormalities.
Centrifugal oil pump 125LY-23-5 is the core equipment of the turbine DC emergency oil pump. From its flow rate, head to the mechanical seal status, each data carries the health code of the equipment operation. Through scientific recording and meticulous analysis, operation and maintenance personnel can not only ensure the efficient operation of the pump, but also provide solid protection for the long-term stability of the turbine system.
When looking for high-quality, reliable oil pumps, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:
E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229
Yoyik offers various types of power plants spare parts for steam turbines, generators, boilers as below:
Main Water Supply Electric Gate Valve Z964Y-2580Lbspl
Vacuum Gate Valve Dkz41Y-25C
Globe Valve Handle Wj25F-2.5P
Ball Valve Q11H-100P
Packing Piston Rod 441-153622-7-A36
Drain Plate Y7-4
Check Valve H44W-63P
Sleeve,Shaft 100Ay67X6-43
Bellows Valves 50Fwj-1.6P
Asco Ef8551G403
Accumulator Bladder Nxq-A-10/10-F-Y
Throttle Valve L61Y-P55.519V
O-Ring 100Ay67X6-43-0
Solenoid Valve 50-Vfe3130-4Tdm-02 N-X140
Stop Valve J41J-40
Drying Drain Valve 80Fwj1.6P
Electric Stop Valve J961Y-P54150V
Instrument Valve J21Y-250P
Vacuum Stop Valve Dkj41H-16P
Globe Valve A156.33.01.01
Oil Cooler Tube Glc3-7/1.6
Accumulator Bladder Nxq-Ab-180/10-Fy
Electric Stop Valve J965Y-500
Three Way Valve Lxf100/1.6C/P
Pump Gm0170Pqmnn
Gate Z41H-100
Servo G772K240A
Instrument Valve J61Y-630V
Insert Valve Rk1
Bearing Yw65-50-125A
Gate Z41W-63P
Post time: Jul-03-2025
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