As a key component of the turbine control system, the cleanliness and stability of the EH oil system have a vital impact on the performance of the turbine. As a filter element used in the suction port of the main oil pump of the EH oil system, regular replacement of the filter element HQ25.011Z is an important maintenance measure to ensure the efficient operation of the system and extend the life of the equipment. Below we will introduce this replacement process in detail to provide a reference for users who use this filter element.

1. Preliminary preparation

Shutdown preparation: Determine the downtime and maintenance window according to the dispatch plan and equipment maintenance plan of the power plant. Ensure that the turbine has been safely shut down before replacing the filter element, and cut off all power and gas sources related to the EH oil system.

Tool and material preparation: Prepare the required professional tools, such as wrenches, screwdrivers, pipe clamps, gaskets, etc., as well as new HQ25.011Z filter elements and necessary cleaning supplies. At the same time, check whether the specifications and models of all tools and materials meet the requirements to ensure the smooth progress of the replacement process.

Safety measures: Develop a detailed safety operation plan, including requirements for wearing personal protective equipment (such as helmets, protective glasses, protective clothing, etc.), as well as emergency response measures. Ensure that all personnel involved in the maintenance have received safety training and are familiar with the operation process and risk points.

2. Filter element replacement process

• System isolation and emptying: First, close the inlet and outlet valves of the main oil pump to ensure that the EH oil system is completely isolated from other systems. Then, drain the EH oil in the main oil pump suction port and its connected pipes into a safe container through the system drain valve or temporary connection to avoid oil leakage and environmental pollution.
• Removing the old filter element: Use special tools to carefully remove the flange or connector of the main oil pump suction port, and be careful to avoid damaging the surrounding pipes and equipment. Then, gently remove the old filter element HQ25.011Z, and pay attention to check the degree of contamination and damage of the filter element in order to analyze the oil quality and filter element service life.
• Cleaning and inspection: Wipe the surface of the suction flange and connector with a clean cloth or special cleaning agent to remove oil stains and impurities. At the same time, check whether the flange sealing surface is flat and undamaged. If necessary, repair or replace the gasket.
• Install the new filter element: Install the new HQ25.011Z filter element on the main oil pump suction port flange in the correct direction. Note that the model and specification of the filter element should be consistent with the original filter element. Use special tools to tighten the flange connector to ensure that the connection is tight and leak-free.
• System oil filling and exhaust: After confirming that the filter element is installed correctly, fill the main oil pump suction port and its connected pipes with new EH oil through the system oil filling valve. At the same time, open the system exhaust valve to remove air and impurities in the pipeline until the oil flows out continuously without bubbles.
• System trial operation and inspection: Start the main oil pump for trial operation and observe whether parameters such as oil pressure, oil temperature and oil flow are normal. At the same time, check the sealing and filtering effect of the new filter element to ensure that there is no leakage and blockage. If there is any abnormality, stop the machine immediately for inspection and treatment.

3. Subsequent work

Recording and archiving: Record the time, model, quantity and abnormal conditions of the filter element replacement in detail, and archive the relevant information. This helps with subsequent equipment management and maintenance planning.

Oil quality monitoring: Strengthen the monitoring and analysis of EH oil quality for a period of time after the filter element is replaced. By regularly sampling and testing various indicators of the oil (such as acid value, moisture, particle size, etc.), oil quality problems can be discovered and handled in a timely manner to ensure the long-term stable operation of the EH oil system.

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