原油和液体或固体石油产品.密度或相对密度的测定.毛细管塞比重瓶和带刻度双毛细管比重瓶法

[中文适用范围]： 本国际标准规定了原油和作为液体处理的石油产品的密度或相对密度的测定方法。 2 毛细管塞比重瓶法也适用于固体，该方法也可用于煤焦油产品，包括道路焦油、杂酚油和焦油沥青，或这些产品与石油产品的混合物。 本方法不适用于根据 ISO 3007 测定雷德蒸气压大于 50 kPa 或初沸点低于 40 ℃ 的高挥发性液体的密度或相对密度。 3 建议使用分级双毛细管比重瓶法来准确测定除较粘稠产品之外的所有产品的密度或相对密度，并且在只有少量样品可用时特别有用。 该方法仅限于根据 ISO 3007 雷德蒸气压为 130 kPa 或更低且在测试温度下运动粘度小于 50 mm/s [50 厘沱 (cSt)] 的液体。 测定高挥发性液体的密度或相对密度时需要采取特殊的预防措施。 [外文原描述]： ISO 3838:2004 specifies methods for the determination of the density or relative density of crude petroleum and of petroleum products handled as liquids. The capillary-stoppered pyknometer method is also for use with solids and this method may also be used for coal tar products, including road tars, 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 according to ISO 3007 or having an initial boiling point below 40 degrees Celsius. The graduated bicapillary pyknometer method is recommended for the accurate determination of the density or relative density of all except the more viscous products, and is particularly useful when only small amounts of samples are available. The method is restricted to liquids having Reid vapour pressures of 130 kPa or less according to ISO 3007 and having kinematic viscosities less than 50 mm 2 /s (50 centistokes (cSt)) at the test temperature. Special precautions are specified for the determination of the density or relative density of highly volatile liquids.