1.1 本试验方法包括使用自动蒸汽压仪器测定原油真空中施加的蒸汽压。本试验方法适用于测试蒸汽压在25℃之间的样品 kPa和180 37.8时为kPa °C，汽液比为4:1和0.02:1（X=4和0.02）。 注1: 本试验方法适用于在0 °C至100 °C和高达500 kPa的压力，但精度和偏差声明（见第 14 )可能不适用。该方法的当前精度仅限于0.02和4的汽液比。（第 14 包括0.02和4）的汽液比。 1.2 该试验方法还允许测定倾点高于15的原油样品的蒸汽压 °C，前提是遵循适当的样品处理、转移和分析程序。 1.3 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关特定警告声明，请参阅 7.2.1 – 7.3.2 . 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 不同体积比下原油的蒸汽压是运输和储存的重要物理性质。 注2: 汽液比为0.02:1（X=0.02）与油轮的情况非常相似。 5.2 原油蒸汽压对原油生产商和炼油厂的一般处理和炼油厂初期处理至关重要。 5.3 通过本试验方法在4:1的汽液比（VPCR）下测定的蒸汽压 4. )原油价格为37。 8. °C可与通过试验方法测试时在相同材料上确定的蒸汽压值相关 D323页 （参见 附录X1 ). 5.4 不得对原油进行空气饱和，以避免潜在的蒸汽损失。然而，冷却验证液的空气饱和是强制性的（见 7.2 和截面 11 ). 5.5 这种测试方法也可以应用于在线应用中。

1.1 This test method covers the use of automated vapor pressure instruments to determine the vapor pressure exerted in vacuum of crude oils. This test method is suitable for testing samples that exert a vapor pressure between 25 kPa and 180 kPa at 37.8 °C at vapor-liquid ratios from 4:1 and 0.02:1 (X = 4 and 0.02). Note 1: This test method is suitable for the determination of the vapor pressure of crude oils at temperatures from 0 °C to 100 °C and pressures up to 500 kPa, but the precision and bias statements (see Section 14 ) may not be applicable. The current precision of the method is limited at vapor-liquid ratios of 0.02 and 4. (Section 14 is inclusive of vapor-liquid ratios of 0.02 and 4). 1.2 This test method also allows the determination of vapor pressure for crude oil samples having pour points above 15 °C provided the proper sample handling, transfer, and analysis procedures are followed. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see 7.2.1 – 7.3.2 . 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Vapor pressure of crude oil at various V/Ls is an important physical property for shipping and storage. Note 2: A vapor-liquid ratio of 0.02:1 (X = 0.02) mimics closely the situation of an oil tanker. 5.2 Vapor pressure of crude oil is important to crude oil producers and refiners for general handling and initial refinery treatment. 5.3 The vapor pressure determined by this test method at a vapor-liquid ratio of 4:1 (VPCR 4 ) of crude oil at 37.8 °C can be related to the vapor pressure value determined on the same material when tested by Test Method D323 (see Appendix X1 ). 5.4 Air saturation of crude oil shall not be done to avoid potential vapor loss. However air saturation of the chilled verification fluid is mandatory (see 7.2 and Section 11 ). 5.5 This test method can also be applied in online applications.