GB/T 2541-1981 Viscosity index calculation table for petroleum products GB/T2541-1981 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Table for calculating viscosity index of petroleum products
GB 2541--81
This table is used to find the viscosity index of a petroleum product when its kinematic viscosity at 40°C and 100°C is known. It is also possible to find the kinematic viscosity at 40°C of a petroleum product by knowing its viscosity index and kinematic viscosity at 100°C. Using this table to find the viscosity index of a petroleum product can avoid many complicated calculations. The viscosity index is a commonly used value used to indicate the viscosity variation characteristics of a petroleum product with temperature. A larger viscosity index means that the change in the kinematic viscosity of the oil product affected by temperature is relatively small. 1. Calculation formula
(1) The viscosity index calculation table of petroleum products is calculated from its 40°C and 100°C kinematic viscosity by the formula in GB199580 "Method for calculating the viscosity index of petroleum products" [that is, the formula of ISO2909-1975 (E)], and the formula is: When the viscosity index (VI) is 0-less than 100
When the viscosity index (VI) is equal to and greater than 100, I=reverse 10g+100
logH-logU
Wherein: U-—kinematic viscosity of the sample at 40°C, centifed (mm2/s); y—kinematic viscosity of the sample at 100°C, centifed (mm2/s); H—the same as the kinematic viscosity of the sample at 100°C, the kinematic viscosity of the petroleum product with a viscosity index of 100 at 40°C, centifed (mm2/s);
the same as the kinematic viscosity of the sample at 100C,
(mm2/s).
The kinematic viscosity of a petroleum product with a viscosity index of 0 at 40°C is (2) From the known viscosity index and kinematic viscosity at 100°C of a petroleum product, the kinematic viscosity of the oil at 40°C can also be calculated, but the above formula should be reorganized and rearranged as follows: When the viscosity index (VI) is 0 to less than 100
U=L-[(VI/100)(LH))
When the viscosity index (VI) is equal to or greater than 100, U=inverse log[logH-NlogY]
N=log[0.00715(VI-100)+1]
2. The scale of this table is as follows:
100℃Kinematic viscosity, centistokes (mm2/s) 2.00~9.99
10.00~19.98
20.00~74.90
National Standard
Ministry of Petroleum Industry of the People's Republic of China
Viscosity index
Implemented on July 1, 1981
Drafted by the Petrochemical Research Institute
Total 952 pages Page 2
3. Table lookup method
GB 2541-81
Example 1 It is known that the kinematic viscosity of a petroleum product at 40°C is 67.37 centistokes (mm2/s) and the kinematic viscosity at 100°C is 8.33 centistokes (mm2/s). What is the viscosity index of this petroleum product?
First find 8.33 in the table of kinematic viscosity at 100°C, centistokes (mm2/s) at the top of the table, and then go down to the table of kinematic viscosity at 40°C and find 67.37. On the same horizontal line, the indicated value in the viscosity index table on the left is 91, which is the required viscosity index of the petroleum product.
Kinematic viscosity!
It is known that the kinematic viscosity of a petroleum product at 100C is 14.32 centistokes (mm2/s) and the viscosity index is 105. To find the kinematic viscosity of the petroleum product at 40°C, first find 14.32 in the table of kinematic viscosity at 100°C, centistokes (mm2/s) at the top of the table, and then find 105 in the viscosity index table. The vertical corresponding values ​​are 134.3, which is the kinematic viscosity of the petroleum product at 40°C, centistokes (mm2/s). If the kinematic viscosity values ​​at 40°C and 100°C are not listed in the table, the two values ​​closest to the value above and below (or left and right) can be found by linear interpolation.
4. The final result of the viscosity index search is rounded off to an integer according to the number rounding rules. V1
7·354
7·736
7·493
7·472
GB2641—81
Total 952 pages Page 3
100C, 2.00~2.09 centistokes
(mm*/s)
(mm*/s)
(mm2/s)
0~5 0VI
7·910
7·796
Total 952 pages Page 4
100C, 2.00~2.09cm (mm2/s) 50~100V1
100℃
GB2541—81
7·037
7·021
7·174
7·285| |tt||7·183
(mm2/s)
(mm*/s)
7·255
7·135
7·395||tt ||7·450
7·433
7·190
100℃bZxz.net
GB2541-81
6·221
9 in total Page 5 of 52
, 2.00~2.09 centimeters (mm2/s)
100°C,
100~150VI
6·133||tt ||(mm*/s)
(mm*/s)
6·175
6·448
6·493
6·259
Total 952 pages, page 6
(mm2/s)
2.00~2.09 centigrade
100C,
150~200VI
GB2541—81
5·819
5·776
(mm2/s)
(mm*/s)
6·065
5·9 27
5·761
5·838
5·404
5·398
5·473
GB2641—81| |tt||5·475
5·247
5·510
Page 7 of 952
(mm2/s)
2.00~2.0 9 centisch
100℃,
200～250VI
5·446
(mm/s)
(mm2/s)
5· 479
5·685
5·559
5·480
5·432
Page 8 of 952
100C, 2 .00~2.09 Centisch (mm2/s)
250~300VI
GB2541-81
5·150
5·211||tt ||5·242
5·090
(mm/s)
(mm2/s)
5·147
5·175
GB 2541—81
Total 952 pages Page 9
100C, 2.10~2.19 centigrade
(mm=/s)
(mm2/s)
(mm2/s)
0～50VI
Total 952 pages Page 10
100°,
2.10~2.19 centigrade
50~100VI
7·156
7·138
(mm2/s)
100℃
GB2541-81
7· 497
(mm/s)
(mm=/8)
7·774
7·735
Training training
Exhaustion tracking training
Reasoning training
6·768
GB2541-81
Total 952 pages Page 11
(mm2/s)
100°C, 2.10~2.19cm
100～150VI
(mm=/s)
(mm*/s)
6·754
6·692
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