1.1 本规程涵盖了获得液化石油气（LPG）代表性样品的设备和程序，如ASTM规范中的规定 D1835 GPA 2140和类似的国际标准。它也可用于其他行业规范或合同协议中定义的通常为单相的其他天然气-液体（NGL）产品（例如，NGL混合物、现场丁烷等），以及挥发性（较高蒸汽压）原油。 注1: 一些浮动活塞气缸的活塞密封非常紧密，以至于一些高蒸气压原油的蒸气压可能不足以在没有手柄移动活塞的情况下进行采样。UN第3类液体（300以下）的替代取样规程 52时为kPa °C）是实践 D8009 ，它使用手动活塞气缸（MPC）取样器。 1.2 本规程不适用于含有大量未溶解气体（N）的非规范产品 2. ，CO 2. )，游离水或其他分离相，如未加工或未加工的气体/液体混合物和相关材料。相同的设备可用于这些目的，但通常需要额外的预防措施来获得多相产品的代表性样品（见 附录X1 ). 1.3 本规程包括管线或容器中取样点位置的建议。用户有责任确保采样点的位置，以获得代表性样本。 1.4 以国际单位制表示的数值应视为标准值。 1.4.1 例外情况- 括号中给出的值仅供参考。 1.5 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制定适当的安全、健康和环境实践，并在使用前确定监管限制的适用性。 1.6 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 本规程允许收集可能含有微量挥发性溶解成分（如甲烷、乙烷和氮气）的液化石油气代表性样品。实践抽样 D1265 可能会导致这些较轻部件的少量但可预测的损失。实践 D1265 适用于收集样品进行常规规格测试，因为轻组件的小损耗在规格下并不显著 D1835 规范要求。 实践 D3700 建议在需要高精度测定轻组分时使用。例如，根据实践采集的样品测定成分 D3700 可用于确定液化天然气混合物的产品价值（见 附录X1 ).

1.1 This practice covers the equipment and procedures for obtaining a representative sample of liquefied petroleum gas (LPG), such as specified in ASTM Specification D1835 , GPA 2140, and comparable international standards. It may also be used for other natural gas liquid (NGL) products that are normally single phase (for example, NGL mix, field butane, and so forth), defined in other industry specifications or contractual agreements, and for volatile (higher vapor pressure) crude oils. Note 1: Some floating piston cylinders have such tight piston seals that the vapor pressure of some high vapor pressure crude oils may not be sufficient to allow sampling without a handle to move the piston. An alternative sampling practice for UN Class 3 liquids (under 300 kPa at 52 °C) is Practice D8009 , which utilizes a Manual Piston Cylinder (MPC) sampler. 1.2 This practice is not intended for non-specification products that contain significant quantities of undissolved gases (N 2 , CO 2 ), free water or other separated phases, such as raw or unprocessed gas/liquids mixtures and related materials. The same equipment can be used for these purposes, but additional precautions are generally needed to obtain representative samples of multi-phase products (see Appendix X1 ). 1.3 This practice includes recommendations for the location of a sample point in a line or vessel. It is the responsibility of the user to ensure that the sampling point is located so as to obtain a representative sample. 1.4 The values stated in SI units are to be regarded as standard. 1.4.1 Exception— The values given in parentheses are for information only. 1.5 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. 1.6 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 This practice allows the collection of a representative sample of LPG that may contain trace volatile dissolved components such as methane, ethane, and nitrogen. Sampling by Practice D1265 can result in a small, but predictable, loss of these lighter components. Practice D1265 is suitable for collecting samples for routine specification testing, as the small loss of light components is not significant under Specification D1835 specification requirements. Practice D3700 is recommended whenever highly accurate determination of light components is required. For example, compositions determined on samples collected according to Practice D3700 may be used to establish the product value of NGL mixtures (see Appendix X1 ).