Determination of the stability of hydraulic oils for lubricating oil system maintenance
2018/5/17 Viewers:
The determination methods of oxidation stability of oil products all over the world are formulated according to their actual conditions, and their standards are also different. But the principle of the method is consistent, and the content of the method is also close to the standard method of the International Electrotechnical Commission (IEC). Several test methods of oxidation stability at home and abroad are briefly introduced as follows:
(1) there are two test methods for domestic power oil: (1) the method of determining the oxidation stability of turbine oil, that is, the GB8119 - 87 method. This method uses a spiral tube oxidation tube. The test oil 30g. uses a certain specification of copper and spiral low carbon steel wire as the catalyst. The flow rate is 17ml/min, the temperature is 120 0.5C, and the continuous oxidation time is 164h. Then the acid value, precipitate and induction period of the oxidized oil were determined. (2) determination of oxidation stability of transformer oil, that is, GB/T12580-90 method. This method uses a straight oxide tube (the same IEC tube), the test oil 25g. with spiral T1 copper wire as the catalyst, the oxygen flow rate of 17ml/min, the temperature of 120 soil 0.5C, continuous oxidation to the oil produced by the volatile acid is the time required for 0.28mgKOH/g.
(2) introduce several methods to be determined abroad: (1) the International Electrotechnical Commission IEC-74 "evaluation of the oxidation stability of insulating oil". This method uses a straight oxide tube, oil sample 25g, copper wire with certain specification and shape as catalyst. The flow rate of oxygen is 17ml/min. and the temperature is 100. The duration of the test is 0.5C.. The test time is 164h. and then the acid value and the precipitate of the oxidized oil are determined. It must be pointed out that the IEC? -74 method is to evaluate the oxidation stability of insulating oil without additives. When adding antioxidants in insulating oil, the 1EC-474 method should be adopted. The name is: the oxidation stability test method of the mineral insulating oil of the inhibitor. The difference between the method is: the temperature is 120 0.5C., other test conditions are basically consistent with the IEC-74 method. II. Japan JIS2101-? -1978R "electrical insulating oil test method 17 oxidation stability test". This method uses a straight oxide tube, and the test oil 25ml is then weighed, with a certain size of copper wire as a catalyst, the pressure of oxygen is 0.8 atmospheric pressure, the temperature is 120 0.5C, 75h. is continuously oxidized and the acid value and precipitate of the oxidation oil are measured. (III) ASTMD2440 77A - "oxidation stability test of mineral insulating oil". The temperature is 110 0.5C., the oxygen flow rate is 17ml/min, the copper wire is used as the catalyst, the continuous oxidation time is 164h., and then the acid value and the precipitate of the oxidized oil are determined.
(1) there are two test methods for domestic power oil: (1) the method of determining the oxidation stability of turbine oil, that is, the GB8119 - 87 method. This method uses a spiral tube oxidation tube. The test oil 30g. uses a certain specification of copper and spiral low carbon steel wire as the catalyst. The flow rate is 17ml/min, the temperature is 120 0.5C, and the continuous oxidation time is 164h. Then the acid value, precipitate and induction period of the oxidized oil were determined. (2) determination of oxidation stability of transformer oil, that is, GB/T12580-90 method. This method uses a straight oxide tube (the same IEC tube), the test oil 25g. with spiral T1 copper wire as the catalyst, the oxygen flow rate of 17ml/min, the temperature of 120 soil 0.5C, continuous oxidation to the oil produced by the volatile acid is the time required for 0.28mgKOH/g.
(2) introduce several methods to be determined abroad: (1) the International Electrotechnical Commission IEC-74 "evaluation of the oxidation stability of insulating oil". This method uses a straight oxide tube, oil sample 25g, copper wire with certain specification and shape as catalyst. The flow rate of oxygen is 17ml/min. and the temperature is 100. The duration of the test is 0.5C.. The test time is 164h. and then the acid value and the precipitate of the oxidized oil are determined. It must be pointed out that the IEC? -74 method is to evaluate the oxidation stability of insulating oil without additives. When adding antioxidants in insulating oil, the 1EC-474 method should be adopted. The name is: the oxidation stability test method of the mineral insulating oil of the inhibitor. The difference between the method is: the temperature is 120 0.5C., other test conditions are basically consistent with the IEC-74 method. II. Japan JIS2101-? -1978R "electrical insulating oil test method 17 oxidation stability test". This method uses a straight oxide tube, and the test oil 25ml is then weighed, with a certain size of copper wire as a catalyst, the pressure of oxygen is 0.8 atmospheric pressure, the temperature is 120 0.5C, 75h. is continuously oxidized and the acid value and precipitate of the oxidation oil are measured. (III) ASTMD2440 77A - "oxidation stability test of mineral insulating oil". The temperature is 110 0.5C., the oxygen flow rate is 17ml/min, the copper wire is used as the catalyst, the continuous oxidation time is 164h., and then the acid value and the precipitate of the oxidized oil are determined.
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