SU1523965A1 - Method of determining corrosion properties of oil - Google Patents

Abstract

The invention relates to the performance studies of oils. A tubular metal sample 15 is placed in the test oil, the oil is heated and circulated at a rate of 1.95-2.05 l / h in a unit with a rod heater 14. At the same time, sample 15 covers the heater 14. The sample area is 15 2.4. -2.6 times the lateral surface area of the heater 14. 2 Il.

Description

oil yield

(L

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The invention relates to the investigation of the performance properties of oils and may find application in the development of new varieties of oils.

The purpose of the invention is to increase the sensitivity of the method.

Fig, 1 presents the scheme of the setup; 2 shows the structure of the heating device.

The VTsM-2K installation consists of the oil tank 1, the pump 2, the electric motor 3, the filter 4, the rotameter 5, the heating device 6, the recording device 7, the pressure gauge 8, the throttle valves 9 and 12, the refrigerator 10 and the spipper 11.

The heating device is a cylindrical body 13 in which a stainless steel heating tube 14 is placed with a metal sample 15 in the form of a corrugated cylinder mounted on it. Inside the tube is an electric heating element 16,

The method is carried out as follows.

Oil from tank 1 is supplied by pump 2 through filter 4 to heating device 6, then it is cooled in chiller 10, is saturated with oxygen of air and enters supply tank 1, oil consumption is controlled by rotameter 5. When it enters the heating device, oil passes through the annular gap between the inner surface the cylindrical body 13 and the evaluation tube 14. There are 6 thermocouples installed in the heating device, which ensures control of the oil temperature over the entire length of the heating tube. Information on the temperature distribution The transmission is transmitted from thermocouples to a recording device. The range of change in oil temperature is from 40 (first thermocouple) to 240 ° C (thermocouple pole). To ensure this heating mode, the oil is pumped under a pressure of 4.0 MPa at a rate of 1.95-2.05 l / h. The test metal samples in the form of a corrugated cylinder (Fig. 2) are installed in the area of the heating tube, in contact with oil heated to 180-200 ° C. Metal specimens are polished with a lavsan brush with AFM-14 paste to a mirror finish. On semi-microanalytics10

15

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five

thirty

35

40

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55

X

PO, where P, - P L, the weight of the samples is determined to the accuracy of the fourth 31. ka. Samples prepared for testing are placed on the outer surface of the heating tube in the zone in contact with oil at 180–200 ° C. The test is carried out continuously for 5 hours. After the test, the test samples are removed from the surface of the tube, washed in isooctane, etched in accordance with GOST. With the help of the polyester brush and residual corrosion products are removed in acetone. The mass of each sample dried at room temperature in grams is determined to the fourth decimal place. I

Corrosion properties of your oils (x) are determined from the form / h

s

weight difference of metal samples before and after the test, g; change in the mass of the sample during idle etching, which determines the amount of dissolved metal; S is the surface area of samples, m

When the pumping rate changes, the temperature range of heating the oil along the heating tube axis shifts. This leads to a change in the temperature test conditions relative to the operating conditions of the oil and, as a result, distortion of the results of the tests. At a pumping rate of V 1 1.8 l / h, the oil overheats to 280 ° C, and at V, 2.2 l / h, the working temperature range of 180-200 ° C goes beyond the limits of the heating tube. Therefore, to maintain an operating temperature range of 90-240 ° C in the oil, the flow rate of the cybran is 1.95-2.05 l / h.

Claims (1)

Invention Formula The method for determining the corrosive properties of the oil, according to which a metal sample is placed in the test oil, heats the oil, circulates it in an installation with a heater, and determines the mass change 15239656 sample in relation to its area - a sample that covers the heater when heated and whose area on which to judge the corrosive properties of the oil, characterized in that, in order to increase the sensitivity of the method, use a rod heater and tubular 2.4-2.6 times the lateral surface area of the heater covered by the sample, and the oil circulation rate is 1.95-2.05 l / h. tel when heated and whose area 2.4-2.6 times the lateral surface area of the heater covered by the sample, and the oil circulation rate is 1.95-2.05 l / h. 1