This table lists the core test items for turbine oil quality inspection, applicable to routine monitoring, maintenance verification, and new oil acceptance tests.
| Test Item (English) | Purpose & Significance | Common Test Standard |
|---|---|---|
| Kinematic Viscosity (40℃/100℃) | Determines the oil's flow performance under operating temperature; ensures lubrication film strength and circulation capacity | GB/T 265, ASTM D445 |
| Viscosity Index | Reflects the viscosity change trend with temperature; higher value means better viscosity stability | GB/T 1995, ASTM D2270 |
| Acid Number | Evaluates the oxidation degree of turbine oil; increased acid number indicates oil aging and potential corrosion to metal parts | GB/T 264, ASTM D974 |
| Neutralization Number | Measures the total acidic/alkaline substances in oil; guides the oil change cycle | GB/T 4945, ASTM D664 |
| Water Content | Excessive water causes emulsification, reduces lubrication performance, and leads to rust of turbine components | GB/T 260, ASTM D95 |
| Flash Point (Open Cup) | Assesses the oil's safety performance; prevents fire hazards in high-temperature operating environments | GB/T 3536, ASTM D92 |
| Pour Point | Determines the low-temperature fluidity of oil; ensures normal startup in cold regions | GB/T 510, ASTM D97 |
| Mechanical Impurities | Detects solid particles in oil; impurities can cause wear of bearings, gears, and other precision components | GB/T 511, ASTM D4870 |
| Oxidation Stability | Evaluates the oil's resistance to oxidation at high temperatures; predicts the service life of turbine oil | GB/T 12581, ASTM D943 |
| Ruler Test (Demulsibility) | Tests the oil's ability to separate from water; turbine oil is prone to water mixing, requiring good demulsibility | GB/T 7305, ASTM D1401 |
| Foaming Tendency and Stability | Prevents excessive foam from reducing oil pressure and affecting lubrication; foam can also accelerate oil oxidation | GB/T 12579, ASTM D892 |
| Copper Strip Corrosion (100℃, 3h) | Evaluates the oil's corrosiveness to copper alloy components (e.g., seals, pipes) | GB/T 5096, ASTM D130 |