1.1 本实施规程涵盖了在取样方法实施规程中使用的标准气瓶中储存和使用液化石油气样品的信息 D1265 和浮动活塞气缸用于取样的方法、实践 D3700 . 1.2 当液化石油气样品用作液化石油气试验方法（如气相色谱（GC）分析（试验方法））的质量控制（QC）参考材料时，本规程尤其适用 D2163 )或蒸汽压（试验方法 D6897 )每次测试仅使用几毫升，因为可以使用相对较小的便携式运输部（DOT）气瓶（例如，20磅普通烧烤气瓶或普通割草机/叉车气瓶）。 1.2.1 修改单通道钢瓶上的泄压阀（QCC1）可能会禁止在允许的设施外收集或运输钢瓶，如炼油厂、天然气厂或管道站。 通常无需对多端口割草机/叉车气缸进行修改，这些气缸具有单独的泄压入口和额外的加注、液体/蒸汽抽出或液位指示入口。请咨询有管辖权的机构，以了解增压气瓶中液化石油气运输的详细区域监管要求。 1.3 本规程可适用于其他试验方法。然而，每次测试需要大量样品的测试方法（例如，手动蒸汽压测试方法 D1267号 )如果储存在标准DOT气瓶或美国机械工程师协会（ASME）容器中，则需要超过1000 L的QC体积。 1.3.1 对容器表面（例如H）敏感的痕量材料的试验方法 2. O、 H 2. 硫/硫或微量残留物）最好使用铝、不锈钢或内涂层容器来最小化表面吸收/反应，或使用更大的容器来最小化表面/体积比。 1.4 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 液化石油气样品在储存和使用过程中会因较轻（分子量较低）碳氢化合物成分、溶解惰性气体（N）的优先汽化而改变成分 2. 、Ar、He等）和其他溶解气体/液体（NH 3. ，CO 2. H 2. S、 H 2. O、 等等）。当用作各种液化石油气试验方法的质控参考材料时，需要仔细选择气瓶类型、气瓶体积和使用惰性气体对气瓶加压，以确保成分变化足够小，以保持液化石油气的完整性。 5.2 根据实践，使用控制图技术监测QC材料的持续精度和偏差 D6299 可用于确定校准或维护的需要。

1.1 This practice covers information for the storage and use of LPG samples in standard cylinders of the type used in sampling method, Practice D1265 and floating piston cylinders used in sampling method, Practice D3700 . 1.2 This practice is especially applicable when the LPG sample is used as a quality control (QC) reference material for LPG test methods, such as gas chromatography (GC) analysis (Test Method D2163 ) or vapor pressure (Test Method D6897 ) that use only a few mL per test, since relatively small portable Department of Transportation (DOT) cylinders (for example, 20 lb common barbecue cylinders, or common Mower/Forklift cylinders) can be used. 1.2.1 Modification of the pressure relief (QCC1) valve on single access port cylinders may prohibit the collection or transport of cylinders outside of permitted facilities such as refineries, gas plants or pipeline stations. No modification is generally required for multi-port mower/forklift cylinders that have a separate access port for pressure relief and additional access ports for filling, liquid/vapor withdrawal or liquid level indication. Consult the Authority having Jurisdiction for detailed regional regulatory requirements for transport of LPG in pressurized cylinders. 1.3 This practice can be applied to other test methods. However, test methods that require a large amount of sample per test (for example, manual vapor pressure Test Method D1267 ) will require QC volumes in excess of 1000 L if stored in standard DOT cylinders or American Society of Mechanical Engineers (ASME) vessels. 1.3.1 Test methods for trace materials that may be sensitive to vessel surfaces (for example H 2 O, H 2 S/sulfur, or trace residues) could preferably use aluminum, stainless steel or internally coated vessels to minimize surface absorption/reaction or larger vessels to minimize surface/volume ratio. 1.4 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 LPG samples can change composition during storage and use from preferential vaporization of lighter (lower molecular weight) hydrocarbon components, dissolved inert gases (N 2 , Ar, He, and so forth) and other dissolved gases/liquids (NH 3 , CO 2 , H 2 S, H 2 O, etc.). Careful selection of cylinder type, cylinder volume, and use of inert gas for pressurizing cylinders is required to ensure that composition changes are small enough to maintain the integrity of LPG when used as a QC reference material for various LPG test methods. 5.2 Monitoring of ongoing precision and bias on QC materials using control chart techniques in accordance with Practice D6299 can be used to establish the need for calibration or maintenance.