This national standard specifies the laboratory methods to test the intensity of crude oil, petroleum product as well as mixture of petroleum product and non-petroleum product by using glass oil hydrometer (hereinafter referred to as densimeter). Reid vapor pressure (RVP) of these liquid is less than 100 kPa.
This standard is applicable to mensuration of intensity of thinly liquid transparent liquid; the mensuration of thick liquid at the temperature higher than the room temperature; and the mensuration of non-transparent liquid, read the reading between the turn-up selene surface and the densimeter main pipe.
Due to the accurate reading of densimeter is marked at the stipulated temperature. Scale reading at other temperature is just the reading of densimeter (apparent density), but not the intensity at such temperature.
Note:
1 Test the volatibility of free water or water in suspension and the intensity of waxy crude by using this standard is not as accurate as the degree of precision in chapter 13. The reason for that is the light component loss in mixed the sample. But, in order to make sure that the sample transferred to densimeter measuring cylinder can represent the whole sample, the sample shall be mixed. Compound sample technology in chapter 7 can guarantee the least light component loss.
2 20℃density values can be converted into relevant 15℃ intensity by using GB/T 1885"Petroleum measurement tables".
