Practical Experience on Switching of Duplex Turbine Oil Filter 0508.2476T1501.AW007

In the steam turbine system of a power plant, the cleanliness of hydraulic oil directly affects the stable operation of the equipment. As a key component, the duplex turbine oil filter 0508.2476T1501.AW007 may cause a sudden drop in hydraulic oil pressure and even cause system shutdown if its switching operation is not handled properly. Therefore, for turbine maintenance engineers, it is crucial to control the details when switching the filter element. Below we will explain how to avoid hydraulic oil pressure fluctuations through scientific operations and share practical strategies for dealing with emergencies.

I. “Pressure trap” in turbine filter element switching

The double-barrel steam turbine filter element 0508.2476T1501.AW007 adopts a double filter element parallel design, which can switch the filter element without stopping the machine, but there is still a risk of a sudden drop in hydraulic oil pressure during the switching operation. A typical case is that during a filter element switching process, due to the failure to fully balance the pressure of the two chambers, the spare filter element was instantly impacted when the oil was fed into the oil, and the system pressure dropped from 12 MPa to 7 MPa, triggering the turbine protection shutdown. After disassembly, it was found that the original working filter cartridge had serious blockage of the filter element, and the pressure difference had reached the preset value, while the spare filter cartridge was not completely filled with hydraulic oil, forming a local vacuum at the moment of switching, causing system pressure imbalance.

The core of this type of problem is that the pressure balance and medium filling of the two chambers are not achieved during the switching operation. The flow inertia of the hydraulic oil at the moment of switching, the difference in filter element resistance, and the improper opening and closing sequence of the valves may all cause pressure fluctuations.

II. “Three-step pressure stabilization method” to avoid sudden pressure drop

1. Pre-switching preparation: balancing valve and pressure difference monitoring

Before switching the turbine filter element 0508.2476T1501.AW007, it is necessary to use the balancing valve to achieve pressure balance between the two chambers first. The specific operation is as follows:

• Open the balancing valve: Before switching, open the balancing valve of the duplex filter first to make the hydraulic oil pressure of the working chamber and the spare chamber consistent. This step can effectively eliminate fluid shock caused by excessive pressure difference.
• Pressure differential monitoring and early warning: Install a high-precision pressure differential gauge to monitor the filter element blockage status in real time. When the pressure differential of the working chamber reaches the preset value, start the switching process in advance to avoid excessive blockage of the filter element and sudden changes in pressure differential.

2. Switching operation: the rhythm of valve action

During the switching process, the opening and closing sequence of the valve directly affects the system pressure stability. The following are key operating points:

• Principle of closing before opening: Before closing the inlet valve of the working chamber, make sure that the spare chamber is completely filled with hydraulic oil. For example, observe whether the spare filter cartridge overflows hydraulic oil through the exhaust screw plug, and switch after confirming that the medium is full.
• Slowly switch the valve: When operating the switching valve, avoid rotating the handle quickly. For example, use the “step-by-step switching method”: pause for 10 seconds after turning 15°, observe the system pressure changes, and gradually complete the switching. This method has successfully avoided a pressure drop accident caused by rapid switching.
• Pre-filling the spare chamber with oil: If the filter element 0508.2476T1501.AW007 has not been replaced for a long time, the spare chamber may not be able to quickly fill with oil due to condensation of hydraulic oil or deposition of impurities. At this time, the spare chamber can be manually emptied, refilled with oil and exhausted to ensure that there is no bubble interference during switching.

3. Subsequent monitoring: dynamic adjustment and emergency measures

After the switch is completed, the system pressure needs to be continuously monitored and preventive measures should be taken:

• Response to short-term pressure fluctuations: If the pressure drops by 5%-10% temporarily after switching, the hydraulic pump outlet pressure setting value can be appropriately lowered and restored after the system stabilizes. For example, after a certain switch, the pressure dropped from 12 MPa to 10 MPa. By reducing the pump pressure for a short time, the system returned to normal levels within 10 minutes.
• Sealing check: After switching, check the sealing of all valves and connections to prevent abnormal pressure due to leakage. For example, use an infrared thermometer to detect the temperature of the valve flange. If a local temperature increase is found, it may indicate seal aging or leakage.
• Confirmation of spare filter element status: Regularly check whether the filter paper of spare filter element 0508.2476T1501.AW007 is intact to prevent impurities from entering the system due to filter element damage. For example, during an inspection, it was found that the filter paper of the spare filter element had tiny cracks due to transportation collision. Timely replacement avoided potential failures.

III. Long-term strategy for turbine filter element maintenance

• Develop a filter element replacement plan based on the pressure differential gauge data and operating time;
• Select filter elements with anti-corrosion coating technology to adapt to the high temperature and high humidity environment of turbine hydraulic oil;
• Prioritize the use of glass fiber filter elements with high filtration accuracy to reduce the risk of impurity intrusion.
• Install pressure sensors and intelligent control systems to realize automatic warning and execution of switching operations;
• Record the pressure difference changes of each switch through the DCS system, establish a turbine filter element performance database, and guide subsequent maintenance.

The switching operation of the duplex turbine oil filter element 0508.2476T1501.AW007 seems simple, but it actually requires consideration of technical details and operating experience. Through strategies such as balancing valve pretreatment, step-by-step valve switching, and dynamic pressure monitoring, not only can the sudden drop in hydraulic oil pressure be avoided, but the life of the turbine filter element can also be extended, ensuring the stable operation of the turbine system.

When looking for high-quality, reliable turbine oil filters, 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

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