1. How is air compressor oil classified?
A: Air compressor oil is divided into reciprocating air compressor oil and rotary air compressor oil according to the structure of the compressor, each of which has three levels of light, medium and heavy load.
Air compressor oil according to the type of base oil can be divided into two types of mineral oil compressor oil and synthetic compressor oil.
2. What kind of reciprocating air compressor oil?
A:Reciprocating air compressor oil is divided into light load L-DAA, medium load L-DAB, heavy duty L-DAC three viscosity grades are set 32,46,68,100,150 five brands, including DAA, DAB Mineral oil type, DAC is a synthetic oil type.
3. What kind of rotary air compressor oil?
A: Rotary air compressor oil by light, medium and heavy loads are also divided into three kinds, namely light load L-DAG, medium load L-DAH, heavy duty L-DAJ, viscosity grade are set 15,22,32 , 46,68,100 six brands, of which DAG, DAH is mineral oil type, DAJ is synthetic.
4. What are the function and main performance of air compressor oil?
A: Air compressor oil is mainly used for compressor cylinder moving parts and exhaust valve lubrication, as well as anti-rust, anti-corrosion, sealing and cooling. As the compressor has been in high pressure, high temperature and condensate water exists in the environment, so the compressor oil should have excellent high temperature oxidation stability, low carbon deposition tendency, suitable viscosity and viscosity-temperature properties, and good Separation of oil and water, rust and corrosion and so on.
5. What are the main types of compressed air compressor oil? What are the advantages of comparing with the oil type?
A: Synthetic compressor oil used in the main base oils are synthetic hydrocarbons (polyalphaolefins), organic esters (diesters), polyalkylene glycol, fluorosilicone oil and phosphate five, compared with the mineral oil-based high temperature stability Good, high temperature is not easy to generate coke, the use of wide temperature, low pour point, volatile, long service life, but expensive, only for mineral oil compressor oil can not withstand the harsh conditions compressor.
6. Why air compressor oil must have good oxidation stability? What is the assessment method?
A: Air compressor oil in the cylinder due to continuous contact with the high-pressure hot air, easily lead to oxidation, decomposition, and the catalytic oxidation of metal wear debris, exacerbated the aging of oil and generate a variety of organic acids, gum , Asphaltene, etc., reducing the mechanical efficiency of the equipment, resulting in wear and tear, elevated machine temperature, and even cylinder explosion. Therefore, air compressor oil must have good oxidation stability, assessment methods for the GB / T12709 Determination of aging properties of oil and GB / T12581 Turbine oil oxidation stability assay.
7. What is the main cause of the explosion of air compressor? How to prevent it?
A: Anti-oxidation stability of the air compressor oil, easy to produce sludge and coke, thermal stability of the air compressor oil is not easy to decompose to produce light hydrocarbons and carbon dust,which is the main cause of air compressor oil explosion.
Oil is easy to generate material of carbon deposit are mainly colloid, asphalt and polycyclic aromatic polymers, depth can be refined to remove, so the depth of the air compressor oil with low viscosity and general refined, does not contain heavy light oil narrow fractions of carbon residue value of low oil as base oil, additives and try to avoid have ashes. To improve the stability and stability of oil.
8. How to choose the viscosity of air compressor oil?
A: The choice of compressor oil viscosity mainly consider the exhaust pressure, followed by taking into account the pressure ratio and exhaust temperature.
Transmission mechanism
Cylinder part
Piston force viscosity grade
KN winter summer
Viscosity grade of exhaust pressure
MPa winter summer
Less than 3532, 4646, 68
>35 46, 6868
Less than 146, 6868, 100
68, 100100, 150 and 10
1040 100, 150150, 220
9. What is the suitable compression medium for air compressor oil?
A: Air compressor oil suitable compression medium with air; various types of hydrocarbon gases (such as natural gas, petroleum gas, coke oven gas, ethylene, propylene, propane, etc.); inert gases (such as hydrogen, nitrogen, carbon dioxide, carbon monoxide and argon, Neon, helium, etc.); active gases (such as chlorine, hydrogen chloride, nitrogen oxides, sulfur dioxide, etc.).
10. What are the current domestic air compressor oil? What are the specifications?
A: At present, there are L-DAA and L-DAB varieties of reciprocating air compressor oils standardized in China. The standard specifications are GB12691-90, and the viscosity grades are divided into five grades of 32,46,68,100,150.
Rotary air compressor oil has been standardized L-DAG light duty injection rotary compressor oil, the standard specifications for the GB5904-86, viscosity grade points 15,22,32,46,69,100, six grades; L-DAH rotary (screw) air compressor oil standards for the enterprise standard, set 32,46,32A, 46A four brands, DAH oil is a new type of high-quality screw compressor oil prepared from hydrogenated base oil, with Excellent thermal oxidation stability and low carbon deposition tendency, of which 32A, 46A is anti-wear type.
11. What is the representative specification of foreign air compressor oil?
A: Foreign air compressor oil representative specifications are: Germany DIN51506 (China GB12691 reference to the development of this standard), ISO / DP6521.3 (China GB5904 reference to the development of this standard).
12.How is gas compression oil classified?
A: ISO / DP 6743/3 divides the gas compressor oil other than air and refrigerant into five types according to the composition and characteristics: DGA (mineral oil type), DGB (special mineral oil), KGC (common synthetic fluid), DGB Non-hydrocarbon synthetic fluid), DGE (commonly used synthetic fluid), of which DGA gas compressor oil is mainly used in the pressure less than 100 × 105Pa N2, H2, NH3, CO2 compressor and any pressure He, Ar, SO2, H2S compressor machine.
13.How to choose air compressor oil?
A: According to the type of compressor oil design, environmental conditions, operating load to choose the type of air compressor oil, under normal circumstances, the long-term high temperature environment (> 30 ℃), the choice of L-DAB oil, high speed water or low pressure, Compressor optional low viscosity compressor oil.
① air-cooled piston shaft output power<20KW, the choice of 32,46,100 (ambient temperature <-10 ℃ optional 32) DAA, DAB, DAC air compressor oil;
② water-cooled piston type 68 or 100 DAA oil selection;
③ drip rotary election No. 100,150,220 DAB or DAC oil;
④ injection rotary election No. 32 DAG, DAH or DAJ oil.
14.What is the compressor oil change indicator?
A：Under normal circumstances, the running compressor oil should be regularly sampled to observe the color and cleanliness of the oil, oil viscosity, acid value, n-pentane insolubles and other physical and chemical properties. That one of the following circumstances should consider oil change. ① oil has been green, darker color 4; ② acid value of more than 0.5mgKOH / g; ③ viscosity changes over ± 15%; ④ n-pentane insoluble matter more than 0.5%.
Light load injection rotary air compressor oil for oil change indicator SH / T0538-93.