Principles for replacing filter element of steam turbine oil purifier

Steam turbines are one of the core power sources in the power, shipbuilding, petrochemical and other industries, and oil is the lifeline to maintain their normal operation. To ensure the efficient operation of steam turbines, it is essential to keep the lubricating oil pure. This leads to professional equipment specially designed to remove water, solid contaminants and oxidation products from oil.

Whether the steam turbine oil filter element needs to be replaced is mainly based on several key indicators and technical detection methods to ensure the continued efficiency and safety of the oil system.

Pressure difference detection principle:

When the filter element is gradually blocked, the resistance of the oil passing through the filter element increases, and a significant pressure difference rise will appear between the inlet and outlet.

Operation: Most modern equipment is equipped with a pressure gauge or sensor to display the pressure of the inlet and outlet oil. When the pressure difference exceeds the maximum value recommended by the equipment manufacturer, it usually means that the filter element needs to be cleaned or replaced.

Oil sample analysis-principle:

The oil sample is analyzed in the laboratory to detect changes in the solid particle content, water ratio and chemical composition in the oil.

Operation: Take samples regularly for inspection and compare with historical data. If the pollutant content increases significantly, especially if it exceeds the predetermined threshold, it means that the filter efficiency has decreased.

Visual inspection principle: 

Observe the surface of the filter element directly to check whether there are obvious stains, deformation, or signs of damage.

Operation: During downtime maintenance, open and visually inspect the filter element. If a serious blockage, deformation, or visible pollutants are found, it should be replaced in time.

Time interval principle: 

Although it is not an accurate method, for some applications, it is also a feasible strategy to develop a regular replacement plan based on fixed operating time and working environment.

Operation: Refer to the equipment manual or industry guide, and set the replacement cycle based on the actual operating conditions. For example, a routine inspection should be conducted at least once a year, and it is decided whether to ｒｅｐｌａｃｅ it immediately depending on the situation.

Manufacturer's recommendation principle: 

Equipment manufacturers usually give replacement recommendations based on filter element characteristics and expected working conditions.

Operation: Follow the manufacturer's replacement guidelines, especially when the equipment is first put into use or after a major overhaul.

Decision-making considerations - economic efficiency:

Balance replacement cost and maintenance cost. Excessive replacement may lead to waste of resources, and delayed replacement may affect the health of the equipment.

Safety considerations:

Ignoring filter element problems may cause system failures and even endanger personal safety. Decisions should not be made only from an economic perspective.

Environmental factors:

Considering the environmental sensitivity of oil, high-efficiency and environmentally friendly filter materials are preferred to reduce environmental pollution caused by waste filter elements. Regular inspection and timely replacement of filter elements are part of maintaining the efficiency of turbine oil filter units.