Requirements for lubricant performance in marine medium-speed engines
author: Ann
2024-09-04
The working principle of medium-speed engine and high-speed engine is basically the same, the general marine medium-speed machine can be as many as 20 cylinders, arranged in pairs or V-type, connected to the propeller through the reduction gear box, lubricant lubrication piston, bearings, etc., but also lubricate the gear box, but the marine medium-speed cylindrical piston engine is characterized by the use of low-quality fuels, so compared with the general high-speed machine, the marine medium-speed engine oil has its special requirements. It should be both marine cylinder oil and marine system oil dual performance requirements.
Medium-speed cylinder piston diesel engine oil performance:
1) The lubricating oil film has enough load-bearing capacity to ensure that the wear is reduced in the boundary lubrication state.
2) Excellent thermal and oxidative stability to minimize the generation of varnish, carbon and sludge.
3) Depending on the sulphur content of the fuel, the oil must have sufficient total alkalinity to neutralize acids and prevent corrosive wear.
4) excellent clean dispersion, medium-speed engine as a ship host, dynamic rate, the engine is always in the process of lubricating oil circulation, centrifugal, purification state. Therefore, the cleanliness of the oil dispersion put forward higher requirements, not in the process of centrifugal purification so that the cleanliness of the oil dispersion is reduced. In addition, medium-speed engine oil in the working process directly with the high temperature of the piston, cylinder liner and combustion of poor-quality fuel and produce more poor gas contact. Therefore, medium-speed engine high-temperature deposit generation tendency is more serious, which puts forward higher requirements for the high-temperature clean dispersion of medium-speed engine oil. Marine medium-speed engine should have excellent clean dispersion, but also requires the oil in the centrifugal purification process does not reduce its clean dispersion.
5) water resistance, generally on the marine oil have put forward this requirement, and medium-speed engine oil because of the need to neutralize the acidic products produced by the combustion of poor-quality fuels, so the oil needs to have a certain TBN. and high alkaline additives to join the oil is not conducive to the resistance of the water, so the more required to have a good water resistance.
Medium-speed cylinder piston diesel engine oil performance:
1) The lubricating oil film has enough load-bearing capacity to ensure that the wear is reduced in the boundary lubrication state.
2) Excellent thermal and oxidative stability to minimize the generation of varnish, carbon and sludge.
3) Depending on the sulphur content of the fuel, the oil must have sufficient total alkalinity to neutralize acids and prevent corrosive wear.
4) excellent clean dispersion, medium-speed engine as a ship host, dynamic rate, the engine is always in the process of lubricating oil circulation, centrifugal, purification state. Therefore, the cleanliness of the oil dispersion put forward higher requirements, not in the process of centrifugal purification so that the cleanliness of the oil dispersion is reduced. In addition, medium-speed engine oil in the working process directly with the high temperature of the piston, cylinder liner and combustion of poor-quality fuel and produce more poor gas contact. Therefore, medium-speed engine high-temperature deposit generation tendency is more serious, which puts forward higher requirements for the high-temperature clean dispersion of medium-speed engine oil. Marine medium-speed engine should have excellent clean dispersion, but also requires the oil in the centrifugal purification process does not reduce its clean dispersion.
5) water resistance, generally on the marine oil have put forward this requirement, and medium-speed engine oil because of the need to neutralize the acidic products produced by the combustion of poor-quality fuels, so the oil needs to have a certain TBN. and high alkaline additives to join the oil is not conducive to the resistance of the water, so the more required to have a good water resistance.
How to judge whether the engine oil is good or bad?
What Grease is Suitable for Excavators?
