1.1 本规程涵盖了获得液化石油气（LPG）规格代表性样品的设备和程序，如规范中规定 D1835 ，GPA 2140，以及可比的国际标准。本标准适用于带两个阀门的流通式钢瓶，不适用于单阀门钢瓶或较大的液化石油气样品容器，如用于烧烤架和/或叉车钢瓶的样品容器。 1.2 本规程适用于获得规范要求的所有低压气体常规试验的代表性样品 D1835 .在根据规范进行取样测试时，如果发生涉及样品完整性的争议 D1835 要求，实践 D3700 应作为裁判抽样程序。 1.3 这种做法也可用于其他行业规范或合同协议中定义的通常为高挥发性单相材料（液化天然气混合物、天然汽油、现场丁烷等）的其他液化天然气（NGL）产品，其中使用开放式样品容器会有挥发性组分损失的风险。 不适用于含有大量未溶解气体（N 2. ，CO 2. )、游离水或其他分离相，如原料或未经处理的气体/液体混合物和相关材料。相同的设备可以用于这些目的，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《实践中的采样指南》 D3700 ). 注1: 实践 D3700 描述了获得轻质烃流体的代表性样品以及当存在溶解气体时用于实验室分析的该样品的后续制备的推荐实践。实践的使用 D1265 由于建立20 % 最小损耗。 1.4 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，以获得具有代表性的样本。 1.5 以国际单位制表示的数值应视为标准。 1.5.1 例外 括号中显示的非国际单位制单位仅供参考。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 液化石油气样品通过各种试验方法进行检验，以确定其物理和化学特性以及是否符合规范。 5.2 根据适用的运输法规，本规程所述设备可能适用于液化石油气样品的运输。

1.1 This practice covers equipment and procedures for obtaining a representative sample of specification Liquefied Petroleum Gas (LPG), such as specified in Specification D1835 , GPA 2140, and comparable international standards. This standard is applicable to flow-through cylinders with two valves and is not applicable to single valve cylinders or larger LPG sample containers such as those utilized for barbecue grills and/or forklift cylinders. 1.2 This practice is suitable for obtaining representative samples for all routine tests for LP gases required by Specification D1835 . In the event of a dispute involving sample integrity when sampling for testing against Specification D1835 requirements, Practice D3700 shall be used as the referee sampling procedure. 1.3 This practice may also be used for other Natural Gas Liquid (NGL) products that are normally highly volatile, single phase materials (NGL mix, natural gasoline, field butane, etc.), defined in other industry specifications or contractual agreements, where use of open sample containers would risk the loss of volatile components. It 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 multiphase products (see Appendix X1 on Sampling Guidelines in Practice D3700 ). Note 1: Practice D3700 describes a recommended practice for obtaining a representative sample of a light hydrocarbon fluid and the subsequent preparation of that sample for laboratory analysis when dissolved gases are present. Use of Practice D1265 will result in a small but predictable low bias for dissolved gases due to the liquid venting procedure to establish the 20 % minimum ullage. 1.4 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. 1.5 The values stated in SI units are to be regarded as standard. 1.5.1 Exception— Non-SI units are shown in parentheses for information only. 1.6 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. 1.7 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 Samples of liquefied petroleum gases are examined by various test methods to determine physical and chemical characteristics and conformance with specifications. 5.2 Equipment described by this practice may be suitable for transportation of LPG samples, subject to applicable transportation regulations.