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Marine lubricants include marine cylinder oil, marine system oil, marine medium speed oil and other small varieties of oil. Cylinder oil is mainly used for large crosshead low-speed diesel engine piston and cylinder liner lubrication, marine system oil is mainly used for large crosshead low-speed diesel engine crankcase lubrication, medium speed marine oil used for marine medium speed cylindrical piston diesel engine lubrication These three categories of marine oil accounted for 9O% ~ 95% of the total amount of marine lubricants. Others for the small varieties of oil, including turbine oil, hydraulic oil, refrigeration oil, gear oil, compressor oil, rail oil, stern tube oil, accounting for about 5% ~ lO%

The main performance cylinder oil

Low-speed marine crosshead engines usually use high sulfur heavy fuels. This kind of fuel will produce a large amount of acidic substances when burning, which will cause corrosion and wear on the surface of cylinder liner and piston. Therefore, the performance of cylinder oil has the following requirements:

① good clean dispersion. In order to maintain long-term cleaning of the piston ring groove and liner air port, reduce the deposition of coke, paint and other deposits, and the formation of ash after burning belong to non-abrasive material.

② good bearing characteristics and boundary lubrication.

③ good acid and ability. Has a "sufficient base value" to neutralize the acidic substances that are produced during the combustion of sulfur-containing fuels.

④ rapid diffusion performance. Require cylinder oil at high temperature, it is necessary to have an appropriate viscosity, but also has a good spread of diffusion properties, the entire work surface to form a complete adsorption film.

⑤ good storage stability. Long-term storage or mixing with other brands of cylinder oil does not produce precipitation.

The relationship between fuel oil and marine lubricants

Prior to the reforming of the fuel oil ships are generally heavy fuel on the 20th, the quality difference between the two fuel oil is very obvious. Thousands of seconds of residual carbon fuel oil, high sulfur content, the combustion of acid generated easily lead to cylinder liner, piston, crankcase corrosion and wear, sludge, coke and ash can accelerate the piston rings and other moving parts of abrasive wear, metal deposition Material has prompted the engine's high temperature corrosion. Therefore need to match the lubricants to solve the problem of detergency and abrasion resistance, to avoid the blind due to the replacement of fuel consumption caused by increased spare parts consumption, navigation and other unsafe factors. Data show that the sulfur content of the fuel oil used is an important basis for the selection of cylinder oil total base number (TSN).

Marine lubricants classification Marine lubricants classification Marine lubricants classification Marine lubricants classification

Marine lubricants variety, there are several major categories:

Cylinder oil

Used for lubrication between low speed crosshead engine piston and cylinder head gasket. Is a two-stroke oil.

2. System oil

Used for low speed crosshead crankcase lubrication.

Low-speed crosshead diesel engines are two-stroke type. Because of the large engine, the piston has a diameter of 500-1000mm, so it is equipped with a diaphragm and a piston rod stuffing box to effectively separate the cylinder from the crankcase. Therefore, the crankcase oil (system oil) does not lubricate the piston. The piston and cylinder Fully rely on mechanical lubricator cylinder oil supply to the cylinder liner around many of the oiling points, through the cylinder oil itself to spread lubrication. The crankcase with crankcase oil (system oil) to lubrication.

3 medium speed oil

For medium-speed cylindrical piston diesel engine lubrication. Medium-speed cylindrical piston diesel piston piston diameter smaller than the crosshead, at 150-500mm, it is very similar with the general structure of the diesel engine, but the engine is larger than the average diesel engine, so it is often thrown by the big end of the connecting rod Speed ​​oil splashed to the cylinder wall to lubricate the piston cylinder and lubricate the crankcase parts. Medium-speed, large piston pistons also have a mechanical oil filler for splash lubrication. Medium-speed machines often burn heavy fuel.

Cylinder oil, system oil, medium speed oil, these three major types of marine oil accounted for 90% of the total amount of 95%, other varieties of small oil, accounting for about 5% -10%.

4. Marine small oil

There are: gas turbine oil, hydraulic oil, refrigeration oil, gear oil, compressor oil, rail oil, stern tube oil, etc.

Classification of marine fuels Classification of marine fuels

1. Marine gas oil (gas oil), sulfur content of about 0.5%.

2. Marine diesel fuel, gas oil and a small amount of residual oil (10% -15%) blending, sulfur content of 0.5% -1.5%.

3. Marine fuel oil, visbreaker bottom oil or vacuum tower bottom oil, sulfur content of more than 3%.

4. Blending marine fuel oil, gas oil and marine fuel oil into a variety of viscosity specifications of marine fuel oil, sulfur content of 1.5% -3%.

Eight kinds of lubricating oil

Lubrication: The lubricant is added between the two contact surfaces of the relative movement to form a lubricating film between the friction surfaces to separate the surfaces in direct contact with each other. The dry friction is the internal friction between the lubricant molecules, reaching Less friction, reduce wear and prolong the purpose of the life of mechanical equipment, the so-called lubrication.

The role of lubricants is:

1, reduce friction: the friction surface by adding lubricant, can reduce the friction coefficient, thereby reducing frictional resistance, saving energy consumption.

2, to reduce wear and tear: lubricant in the friction surface can reduce abrasive wear, surface fatigue, adhesive wear caused by wear and tear.

3, the cooling effect: lubricant can absorb heat, heat and heat, which can reduce the friction caused by the temperature rise.

4, anti-rust effect: there is lubricant on the friction surface, you can prevent the air, water droplets, water vapor, corrosive gases and liquids, dust, oxides caused by corrosion.

5, the role of transmission: In many cases the lubricant has the function of transmitting power, such as hydraulic transmission and so on.

6, the sealing effect: lubricant to some exposed parts to form a seal, to prevent the infiltration of moisture impurities.

7, damping effect: When subjected to impact load, you can absorb the impact energy, such as car shock absorption.

8, the role of cleaning: The cycle of lubricating oil can take impurities, filtered through the filter.

Marine engine oil what kind of oil?

A: Marine engine oil (generally referred to as marine oil) has three broad categories: marine system oil (for + prefix type crankcase crankcase lubrication) marine cylinder oil (for + prefix type diesel engine cylinder lubrication) Marine Medium Speed Oil (for cylindrical piston diesel engine lubrication)

Different marine oils can be mixed with different marine oils can be mixed? why?

A: No. Because of the current marine oil formulating system is different, the two oils are mixed, additives may interact with each other to produce precipitation or mutual weakening and other adverse consequences, and even lead to serious machine damage accident. It must therefore be noted that marine oils (even of the same quality grade) from two different companies (domestic and foreign, foreign and foreign) are not allowed to be mixed together without scientific testing (miscibility tests).

Marine oil selection principle is what?

A: There are mainly two aspects: First, the viscosity level. The viscidity level of marine oil is relatively single. The system oil and medium speed oil are divided into SAE30 and SAE40 two grades, the cylinder oil is mostly SAE50, the navigation environment temperature is high, and the engine working condition is slightly worse, the viscosity grade should be selected slightly higher, otherwise , The choice of lower viscosity oil. Second, the quality level. Marine oil quality level is based on the total TBN oil size to distinguish. The choice of base oil value is very important. Mainly based on the level of sulfur fuel used by ships to choose. In general TBN is too small, oil acid and lack of capacity, can cause corrosion, wear and tear; TBN is too large, high metal ash, can cause wear and tear, while additives add large amount of oil costs will increase.