Flow Alarm of Steam Turbine EH Oil Return Filter AD3E301-02D03V/-W

In the EH oil system of the steam turbine, the return oil filter AD3E301-02D03V/-W is a key component to ensure the cleanliness of the fire-resistant oil. However, when the return oil flow rate of the system suddenly increases, the return oil filter element often becomes the “first to be affected” component, and its abnormal performance may directly lead to equipment failure or even shutdown. Below we will combine real cases with technical details to analyze the typical phenomena and treatment strategies of the return oil filter element when the flow rate is abnormal.

I. Sudden increase in flow: the stressful moment of the return oil filter element

The original design of the return oil filter element AD3E301-02D03V/-W is to intercept particulate impurities and metal debris in the oil to ensure the cleanliness of the return oil system. However, when the return oil flow rate suddenly increases, the filter element may face three challenges: flow velocity shock, pressure difference imbalance and mechanical stress concentration.

A typical case is that the operator found that the temperature of the return oil pipeline of the EH oil system increased abnormally, and the value displayed on the filter element pressure differential gauge suddenly increased from 0.1 MPa to 0.6 MPa. After disassembling the return oil filter, it was found that the filter surface was covered with a large amount of metal debris and agglomerated impurities, and the filter skeleton was partially deformed due to long-term high-velocity impact. Further investigation revealed that the return oil volume surged due to the high-pressure oil pump outlet valve being stuck, and the oil formed vortices and local blockages in the filter element, which eventually triggered a pressure difference alarm.

The essence of this phenomenon is that the sudden increase in flow caused the filter element to be overloaded and the filter medium to fail locally. For example, in one failure, the fiber filter of the filter element was torn due to the impact of high-speed oil flow, and some impurities directly penetrated the filter element into the oil tank, causing the servo valve to be stuck.

II. The red light signal of the return oil filter element: four abnormal signs

1. Sudden increase in pressure difference: silent alarm of system pressure

During normal operation, the pressure difference of the return oil filter element AD3E301-02D03V/-W is usually less than 0.2 MPa. When the return oil flow rate suddenly increases, the pressure difference may soar to more than 0.5 MPa in a short period of time, and even trigger a protective shutdown.

2. Filter element deformation: the fatal blow of mechanical stress

Under high flow impact, the metal skeleton of the filter element may break or bend partially due to fatigue, resulting in failure of the seal between the filter element and the housing, and short-circuit flow of the oil.

3. Impurity penetration: collapse of filtering ability

A sudden increase in flow may make the filter medium of the return oil filter element AD3E301-02D03V/-W unable to effectively intercept impurities due to excessive flow rate. For example, in one failure, only a small amount of impurities remained on the surface of the filter element, but a large amount of rust particles were detected in the oil tank, indicating that the filter element had lost its interception ability.

4. Oil emulsification: the collateral effect of flow loss control

When the return oil flow rate increases abnormally, the residence time of the oil in the return oil filter element AD3E301-02D03V/-W is shortened, which may result in failure to fully separate water and acidic substances. For example, in one case, the oil was severely emulsified, and the surface of the filter element formed a hard block, which eventually caused the oil pump inlet to be blocked.

III. Practical response: from emergency replacement to system management

1. Emergency treatment: filter element replacement and flow adjustment

When the return oil filter AD3E301-02D03V/-W has the above abnormality, the first task is to replace the filter element immediately, adopting the strategy of “replace the element first and then adjust”: use the spare filter element to temporarily restore the system operation to avoid further intrusion of impurities; reduce the return oil volume to the normal range by adjusting the overflow valve opening or checking the high-pressure oil pump outlet valve.

2. Deep governance: Root cause investigation of sudden flow increase

Sudden flow increase is often the “appearance” of system problems, and it is necessary to start from the source:

• Check the outlet valve of the high-pressure oil pump: valve core stuck or seal aging may cause the return oil volume to be out of control. For example, the outlet valve cannot be closed due to foreign matter stuck, and the return oil volume surges;
• Check the servo valve leakage: internal leakage of the servo valve will cause abnormal return oil volume. For example, the wear of the servo valve core causes a large amount of return oil, which eventually leads to the failure of the return oil filter AD3E301-02D03V/-W;
• Optimize the filter element selection: If the system has long-term flow fluctuations, it can be upgraded to a high-flow tolerance filter element (such as a double-layer filter design).

3. Prevention strategy: from passive maintenance to active protection

Install an online flow monitor: real-time monitoring of the return oil flow, and automatically alarm when it approaches the critical value;

Regular system cleaning: use special cleaning agents to remove metal debris and sediments in the oil circuit to reduce the risk of filter element clogging;

When the return oil flow of the turbine EH oil system suddenly increases, the abnormal performance of the return oil filter AD3E301-02D03V/-W is like a “red alarm”, indicating that the system is in a high-risk state. By urgently replacing the filter element, troubleshooting the source of the flow, and optimizing the maintenance strategy, it can not only resolve the immediate crisis, but also build a long-term protection system.

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E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229

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