Oil film bearing oil lubrication management and use requirements

Core Tips: (1) Lubrication management of oil film bearing oil: The data indicates that more than half of the main causes of mechanical failure or early wear are related to lubrication technology management. Do a good job in lubrication management, prevention
(1) Lubrication management of oil film bearing oil:

    The data indicates that more than half of the main causes of mechanical failure or early wear are related to lubrication technology management. Improve lubrication management, prevent abrasion or sintering of frictional moving parts such as bearings and gears, prevent and reduce wear, reduce frictional resistance, prevent equipment accidents, improve equipment production efficiency, save energy, improve energy efficiency, and increase economy. Benefits are the main task of lubrication management.

    1. Lubrication management is a professional technical management. Full-time lubrication technical management personnel should be set up to develop a lubrication management system and train lubrication technical knowledge.

    2. Under the premise of reasonable fuel tank capacity, keep the oil tank reasonable oil level, often add lubricating oil to the fuel tank, so that the oil in the fuel tank is always in a reasonable operating oil level, degas the oil, precipitate the machine, separate the water and It is advantageous to reduce the oil temperature in the tank.

    3. Timing, positioning and extraction of oil samples in operation, testing and testing from oil odor, color, viscosity change, water content, water separation performance, pollutant type and content, anti-foaming performance. When the water content in the oil entering the lubrication point exceeds 0.1%, the mechanical wear increases sharply; the lubrication condition exceeding 0.5% is very dangerous. Make a test record.

    4. Analyze and compare each test record, predict and forecast the poor lubrication state, and formulate improvement or preventive measures. It is safe and reliable to control the oil level, oil quality, oil temperature and oil pressure of the system to prevent the occurrence of lubrication accidents.

    5. Prevent contamination of oil and control oil:

    (1) Oil product purchase, storage, storage, issuance and waste oil treatment, there should be a strict management system, according to different varieties and grades, there are obvious easily distinguishable signs or signs, indicating the name, grade, date, etc. . It is forbidden to mix and store to prevent misuse and cause oil mixed accidents.

    (2) During storage, storage and storage, the container should be strictly cleaned and sealed to prevent the intrusion of dust, impurities and rain. It should be stored in a darkroom that is protected from light, cool and ventilated, and has a fire exit. When temporarily storing in the open air, the bucket cover should be kept in a slightly inclined position to prevent rainwater from entering. Oil should not come into contact with metals such as copper and lead that promote oxidation.

    (3) Main items of re-inspection of lubricating oil acceptance: viscosity, viscosity index, water content, demulsibility, extreme pressure. Cleanliness requires mechanical impurities within 0.01%, no moisture and deposit marks.

    (4) The manhole cover on the top of the fuel tank should be tightly closed and should not be opened. The air filter has an filtration accuracy of 100 mesh or more, and is regularly inspected and cleaned, and the drain valve at the lower part of the fuel tank is periodically discharged. Add lubricant to the tank to apply the pipeline pumping and install a filter with appropriate filtration accuracy. The tank should be cleaned of the sludge regularly, and the inner surface of the tank should not be rubbed with a fabric.

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Pump bearings and seals are not resistant to wear and high temperatures

Core Tips: (1) Problems: Axis deviation causes high vibration, shortens the life of the mechanical seal, and generates noise. Solution: Use the impeller ring of polyimide carbon fiber composite material to match
(1) Problems occur: the shaft deviation causes high vibration, shortens the life of the mechanical seal, and generates noise.

    Solution: Use the impeller mouth ring of polyimide carbon fiber composite material to fit the stainless steel pump casing ring; replace the original graphite bushing with the throat bushing of our material.

    The result: reduced vibration amplitude, which extends seal life and bearing life and enhances pump free operation. Many pumps use packing as a filler in their use. The main function of the packing is to prevent leakage, but it also acts as a bearing to stabilize the shaft. At present, many pumps have changed the packing to a mechanical seal. With the change of the mechanical seal, the bearing influence is gone, and the shaft deviation (high vibration and related influence) becomes a problem.

    The use of polyimide carbon fiber composite material to improve the pump successfully solved the customer's problems, mainly in the following two points:

    1) Polyimide carbon fiber composite is a metal-free, non-biting material. This allows the running clearance to be reduced (only half of the gap between the metal gaps specified by the API), the bushing with smaller clearances can stabilize the shaft, and the smaller gap ring can further limit leakage and leakage speed.

    2) Polyimide carbon fiber composite is a high strength, high performance thermoplastic material. It is easy to injection and absorbs vibrations and shocks, while the metal being replaced can cause vibration and shaft wear.

Parts: with removable sealing bushings and Teflon bearings

    (2) There is a problem: the support bearing is severely worn. The factory tried a lot of different materials such as carbon, graphite, and filled Teflon materials, trying to find a suitable solution to the problem of wear and shaft deviation. All materials were scrapped in two to three months. Among them, the product of polytetrafluoroethylene causes wear of the shaft, causing great leakage, resulting in failure of the mechanical seal.

    Solution: Replace the previously used filled PTFE bearing with a polyimide carbon fiber composite.

    RESULTS: After the polyimide carbon fiber composite support bearing was installed, it has been successfully operated for more than 13 months. At the 8th month after use, the center part of the agitator was removed and temporarily used for other equipment. At that time, the staff tested it. The agitator bearing found that the leakage per inch per inch was less than 0.005, and the average failure interval increased by 300% to 400%.

    (3) Problems: This pump is made of stainless steel and stainless steel with a hard outer casing as a ring and bushing. In general, the dry running of the pump is caused by a decrease in the amount of suction during operation, and the main dry running conditions often lead to premature pump damage and metal parts are also greatly damaged. The average time between failures of these pumps is only six months.

    Solution: Replace the stainless steel impeller ring and bushing with a polyimide carbon fiber composite material, reducing the operating clearance by approximately 50%.

    The result: Pumps modified with polyimide carbon fiber composites have been in use for more than a year now. Some unfavorable conditions often occur during the previous operation, causing intermittent dry rotation, which makes the pump inoperable, but this phenomenon has been delayed by the renewal of polyimide carbon fiber composites. In addition, the customer also issued a report: by using polyimide carbon fiber composite material to transform it, reducing the operating gap, the pump output flow has increased by 400gpm, and the other two multi-stage pumps have also been updated.

    (4) Problems occur: severe vibration, low pump efficiency

    Solution: Polyimide carbon fiber composite material is used as the pump casing ring and bushing. The running clearance was reduced from the API standard to 0.0015 inches per inch of turning diameter.

    Result: The initial vibration was 0.600 inches/second, the improved vibration was 0.094 inches/second, and the efficiency was increased by 5%.

    Vibration: The reason for the vibration reduction is as follows:

    1) Recirculation flow and its effect on rotor instability is reduced;
    2) The clearance is reduced and the running of the shaft is reduced;
    3) Natural thermoplastic materials have easy injection molding properties and absorb shock or impact.

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