“Red Light Signal” of Diatomite Filter 30-150-207 When Acid Value Exceeds the Limits

In the EH oil system of the power plant, the diatomite filter element 30-150-207 is the core component of the acid removal filtration, and its performance directly determines the acid value control effect of the fire-resistant oil. However, when the system has a situation where the oil acid value exceeds the standard by dozens or even hundreds of times, the filter element is often in a “limit combat” state.

I. The “fatal blow” of excessive acid value to diatomite filter element

The working principle of the diatomite filter element 30-150-207 is to absorb the acidic substances in the oil through porous diatomite particles, thereby reducing the acid value of the oil. However, when the acid value of the oil increases abnormally, the adsorption capacity of the filter element will be rapidly consumed, and even a chain reaction will be triggered.

Under relatively harsh working conditions, the acid value of EH oil often exceeds 6mgKOH/g, which is almost 30 times higher than the standard value (usually ≤0.2 mgKOH/g). After disassembling the diatomaceous earth filter element 30-150-207, it was found that its appearance was dark brown or even black, the surface of the filter layer formed hard lumps, and the internal diatomaceous earth particles completely lost their adsorption capacity. Further tests showed that the residual amount of acidic substances in the filter element had reached saturation and could not continue to remove acid.

The essence of this phenomenon is that the excessive acid value causes the filter element adsorption material to fail and accelerates the destruction of the filter element’s physical structure. When the oil acidity is too high, the microporous structure of diatomite earth will be corroded by acidic substances, forming local blockage or collapse.

II. “Red Light Signal” of Diatomaceous Earth Filter Element: Four Abnormal Signs

1. Color Change: “Warning Line” from Grayish White to Dark Brown

The diatomite filter element 30-150-207 in normal use should be grayish white or light yellow. When the acid value exceeds the standard, the filter element will gradually change color due to the adsorption of a large amount of acidic substances, and finally appear dark brown or black.

2. Sudden increase in differential pressure: “silent alarm” of system pressure

Acid value exceeding the standard will cause blockage inside the filter element, significantly increasing the resistance of oil passing through the filter element. The differential pressure gauge shows that the differential pressure of the filter element is usually less than 0.2 MPa during normal operation, but when the acid value is abnormal, the differential pressure may rise to more than 0.6 MPa in a short time.

3. Hardening of the filter element: a “death signal” within reach

In an acidic environment, diatomite earth particles will react chemically with metal oxides in the oil to form hard precipitates. At this time, the filter element will become extremely hard and even impossible to break apart by hand.

4. Oil emulsification: the “collateral effect” of uncontrolled acid value

When the acid value exceeds the standard, the water in the oil will combine with the acidic substance to form a stable emulsion. At this time, the diatomite filter element 30-150-207 will not only fail to remove acid, but will also fail prematurely due to blockage of the emulsion. EH oil caused the servo valve to become stuck due to severe emulsification, which eventually caused the turbine protection shutdown.

III. Practical response: from emergency replacement to system management

1. Emergency treatment: filter replacement and oil replacement

When the diatomite filter element 30-150-207 has the above abnormality, the first task is to immediately replace the spare filter element and temporarily restore the system operation to avoid further deterioration of the acid value; next, the high acid value oil in the tank is pumped out by the circulation pump, and new oil is injected and neutralizer is added to gradually reduce the acid value to a safe range.

2. Root cause investigation of excessive acid value

Excessive acid value is often the “appearance” of system problems, and it is necessary to start from the source.

• Check the seal: The wrong material or aging of the seal will release acidic substances.
• Check for water intrusion: The blockage of the tank breathing valve causes high air humidity, and water molecules react with the oil to generate acidic substances. For example, in a fault, the breather valve filter screen was dusty, the oil water content exceeded the standard, and eventually caused the acid value to soar;
• Optimize the regeneration cycle: The regeneration cycle of the diatomaceous earth filter element 30-150-207 is usually 3-6 months. If the acid value continues to be high, it is necessary to shorten the replacement frequency or upgrade the high-capacity filter element.

3. “Active protection” strategy

Install an online acid value monitor: real-time monitoring of the oil acid value, and automatically alarm when it approaches the warning value;
Regular system cleaning: Use a special cleaning agent to remove acid deposits in the oil circuit and restore the cleanliness of the system.

When the EH oil acid value exceeds the standard, the abnormal performance of the diatomite filter element 30-150-207 is like a “red alarm”, indicating that the system has entered a dangerous state. By replacing the filter element urgently, troubleshooting the root cause, and optimizing the maintenance strategy, it can not only resolve the immediate crisis, but also build a long-term protection system.

When looking for high-quality, reliable oil pump 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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