SIS SS-ISO 3838:1987 Crude petroleum and liquid or solid petroleum products - Determination of density or relative density - Capillary- stoppered pyknometer and graduated bicapillary pyknometer methods
1.1 This International Standard specifies methods for the determination of the density or relative density of crude petroleum and of petroleum products handled as liquids.
1.2 The capillary-stoppered pyknometer method is also for use with solids and this method may also be used for coal tar products, including road t?rs, creosote and tar pitches, or for mixtures of these with petroleum products. This method is not suitable for the determination of the density or relative density of highly volatile liquids having Reid vapour pressures greater than 50 kPa (0,5 bar) according to ISO 3007 or having an initial boiling point below 40 °C.
1.3 The graduated bicapillary pyknometer method is recom-mended for the accurate determination of the density or relative density of all except the more viscous products, and is par-ticularly useful when only small amounts of samples are available. The method is restricted to liquids having Reid vapour pressures of 130 kPa (1,3 bar) or less according to ISO 3007 and having kinematic viscosities less than 50 cSt (50 mm2/s) at the test temperature.
Special precautions are specified for the determination of the density or relative density of highly volatile liquids.
SIS SS-ISO 3838:1987 history
1987SIS SS-ISO 3838:1987 Crude petroleum and liquid or solid petroleum products - Determination of density or relative density - Capillary- stoppered pyknometer and graduated bicapillary pyknometer methods