ISO 12185 pdf download

ISO 12185 pdf download.Crude petroleum and petroleum products – Determination of density – Oscillating U-tube method 1 Scope This International Standard specifies a method for the determination, using an oscillating U-tube density meter, of the density of crude petroleum and related products within the range 600 kg/m3 to 1 100 kg/m3 which can be handled as single-phase liquids at the test temperature and pressure. This International Standard is applicable to liquids of any vapour pressure as long as suitable precautions are taken to ensure that they remain in single phase with no loss of light ends and subsequent changes in composition and density during both the sample handling and the density determination. NOTE 1 If the determined density is to be converted to a density at some reference temperature using petroleum measurement tables, the determination should be carried out at a temperature as close as possible to the reference temperature in order to minimize uncertainties due to the use of generalized tables. This method is not intended for use in calibrating on- line density meters. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and I S0 maintain registers of cur- rently valid International Standards. I S0 91-1 :I 992, Petroleum measurement tables – Part 7: Tables based on reference temperatures of 15 C and 60 degrees F, I S0 91-2:1991, Petroleum measurement tables – Part 2: Tables based on a reference temperature of 20 “C. I S0 301 5:1992, Petroleum products – Determination of cloud point. I S0 301 6:1994, Petroleum products – Determination of pour point, I S0 31 70~988, Petroleum liquids – Manual sampling. I S0 31 71 :I 988, Petroleum liquids – Automatic pipe- line sampling. IS0 3696:1987, Water for analytical laboratory use – Specification and test methods. I S0 3838:1983, Crude petroleum and liquid or solid petroleum products – Determination of density or relative density – Capillary-stoppered pyknometer and graduated bicapillary pyknometer methods. 3. Definitions For the purposes of this International Standard, the following definitions apply. 3.1 density: Mass of the substance, expressed in kilograms, divided by...