ISO 29945:2009 冷冻的非石油基液化气燃料 二甲醚（DME） 陆上终端的手工取样方法
标准编号：ISO 29945:2009
中文名称：冷冻的非石油基液化气燃料 二甲醚（DME） 陆上终端的手工取样方法
英文名称：Refrigerated non-petroleum-based liquefied gaseous fuels — Dimethylether (DME) — Method of manual sampling onshore terminals
发布日期：2009-11
标准范围
ISO 29945:2009规定了装卸港码头冷藏液化二甲醚的手动取样方法。ISO 29945:2009还规定了详细的预防措施，以确保取样工作期间的安全。然而，针对用于取样的设备（如取样管线和样品瓶）提出的安全措施仅限于一般术语，因为它们主要受国家监管要求的约束。ISO 29945:2009不包括关于管线或容器中采样点位置的建议。用户有责任确保采样点的位置以获得代表性样本。然而，为了防止在取样之前DME在管线中蒸发，优选将取样点定位在管线中DME的压力和温度保持恒定的位置，以确保仅从液相获得样品。ISO 29945:2009经必要修改后也适用于以下情况:在液化气罐车上对二甲醚进行取样，如果提供了适当的取样设备；化学和物理性质与二甲醚相似的其他冷藏、非石油基液化气体燃料的取样。二甲醚的详细化学和物理性质不同于液化石油气，这表明二甲醚需要不同于液化石油气的预防措施。然而，它们的基本特性彼此相似，因此在ISO 29945:2009中一般参考了许多国家应用的液化石油气预防措施。关于质量的注意事项，也可以参考本国际标准中相应的单项。
ISO 29945:2009 specifies a manual sampling method for refrigerated liquefied DME at terminals in both loading and unloading ports. ISO 29945:2009 also specifies detailed precautions to ensure safety during sampling work. However, safety measures, proposed for equipment being used for sampling, such as sampling lines and sample cylinders, are limited to general terms because they are governed mostly by national regulatory requirements.ISO 29945:2009 does not include recommendations for the location of a sampling point in a line or vessel.It is the responsibility of the user to ensure that sampling point is located so as to obtain a representative sample. However, to prevent vaporization of DME in the line before sampling, it is preferable to locate the sampling point at a place where the pressure and temperature of the DME in the line is kept constant to ensure obtaining a sample from the liquid phase only.ISO 29945:2009 is also applicable to the following cases, with necessary modifications:
- sampling of DME on board liquefied gas tankers where appropriate sampling apparatus is provided;
- sampling of other refrigerated, non-petroleum-based, liquefied gaseous fuels whose chemical and physical properties are similar to those of DME.
标准预览图
