КОНТРОЛЬ ЗА СМАЗКОЙ ЦИЛИНДРОВ СУДОВЫХ МАЛООБОРОТНЫХ ДИЗЕЛЕЙ

Abstract

The article focuses on the problem of organizing control over oil supply to the cylinders of a marine diesel engines during slow speed operation. In the instructions for diesels with mechanical lubricators manufacturers strongly recommend to recalculate the actual specific oil consumption at share load and to reduce it to full operational load when evaluating oil consumption. The obtained specific oil consumption should be compared with the standard value, which was assigned for the full load regime. Manufacturers use different symbols for these parameters and different principles of oil supply regulation in their manuals. The variety of symbols and formulas makes it difficult to understand the technique, which is the reason why it is not applied on many vessels, as evidenced by the experience of certification of ship mechanics in the Maritime Qualification Commission of the port of Vladivostok. There have been proposed measures for wider application of the technique on ships, as it allows generalizing the experience of using oil on one-type engines in their operation on different types of ships with different load and practice to correct the recommendations about the cylinder oil dosage. Much attention is given to the features of the control organization over the lubrication of the cylinders on new generation ME S and G MK 8 type engines and later types with electronic control and regulation systems for continuous operation at super-low loads. When using a fuel with high sulfur concentration, these engines suffer from excessive wear of the cylinder bushings in their upper part due to acid corrosion because of hypernormal cooling of bushings. Therefore, the designers of diesel engines have developed special manuals on cylinder lubrication. There has been given the justification for applying the universal symbol qMR g/kW (h/kW) to indicate the initial rate of specific consumption of cylinder oil in relation to the full load of the marine low-rate diesels and the symbol qMR for “actual specific consumption reduced to a full load”. The details of oil dosage in the new generation S and G MK 8 type diesel engines are given, in which the effect of cold corrosion of bushes at low loads is manifested.