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details Marine system oil, also known as crankcase ventilation oil, this kind of oil has no lubricating effect on the piston rod, only the effect of crankcase ventilation lubrication, cooling, corrosion prevention。It is because the low speed + two-stroke diesel engine has a long four-stroke and a large piston rod diameter (500 ~ 1000㎜), so it is equipped with a transverse partition and a hydraulic cylinder filler box to separate the cylinder and the crankcase ventilated reasonably。Taking Kuroda Lubricant's Marine system oil as an example, the characteristic requirements are:
2.Excellent air oxidation stability;The cooling piston rod requires that the system oil should have oxidation resistance at higher temperatures, in addition, the catalytic reaction of worn metal particles will also increase the air oxidation mildew of the oil, so this characteristic is particularly important for the system oil。
3.Quiet and dispersed。
4.Acid compatibility and excellent corrosion protection for [aluminum/tin aluminum/copper coating, bearing alloys, etc.] few metals。
5.适度的黏度﹙100℃运动粘度;11～14M㎡/S﹚和粘度系数﹙VI>90﹚。
According to the above characteristics, Marine system oil is generally used to lubricate the rolling bearings in the crankcase ventilation of diesel engines, and it is also used for oil-cooled piston rods。However, it is not in direct contact with high temperature natural gas, and the standard is relatively relieved in the work。
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