天然气-气体取样

[中文适用范围]： 本文件提供了确保输送到输配电网的天然气和天然气替代品样本能够代表其分配质量的方法。 注：为确保标准中考虑到特定气体，请参阅附录 A。 本文件适用于测量和监测可互换性标准、能源含量和网络进入条件的现场和地点的采样，特别是在跨境和财政测量站。 它是天然气加工控制应用和痕量成分测量的重要来源。 本文件仅适用于天然干气（单相——通常是通过天然气管道传输的气体）采样。 有时，天然气流可能夹带液态碳氢化合物。 尝试对湿天然气流进行采样可能会在所得的流成分分析中引入额外的未指定的不确定性。 对湿气流（两相或三相）进行采样不属于本文件的范围。 本文件不适用于与气体采样相关的安全问题。 [外文原描述]： This document gives means for ensuring that samples of natural gas and natural gas substitutes that are conveyed into transmission and distribution grids are representative of the mass to which they are allocated. NOTE To ensure that a particular gas is taken into account in the standard, please see Annex A. This document is applicable for sampling at sites and locations where interchangeability criteria, energy content and network entry conditions are measured and monitored and is particularly relevant at cross border and fiscal measurement stations. It serves as an important source for control applications in natural gas processing and the measurement of trace components. This document is applicable to natural dry gas (single phase - typically gas transiting through natural gas pipelines) sampling only. On occasion a natural gas flow can have entrained liquid hydrocarbons. Attempting to sample a wet natural gas flow introduces the possibility of extra unspecified uncertainties in the resulting flow composition analysis. Sampling a wet gas (two or three phases) flow is outside the scope of this document. This document does not apply to the safety issues associated with gas sampling.