本文件规定了用于液化天然气（LNG）和其他冷冻碳氢化合物流体动态测量的流量计的计量和技术要求。有关保管转移中使用的LNG静态体积测量，请参见ISO 10976。 本文件规定了在低温应用中正确选择和安装流量计的最佳实践，并确定了可能影响使用中流量计性能的具体问题。 此外，它还通过使用LNG或其他参考流体，为实验室和现场条件（质量或体积）提供了校准指南。校准液的选择将取决于可用流量校准设施的能力，以及达到预期应用要求的整体测量不确定度的能力。 本文件适用于但不限于使用科里奥利流量计和超声波流量计对LNG进行动态测量。 原则上，本文件中考虑了液化天然气和其他冷冻液态烃。本文件中的建议基于液化天然气的可用测试结果。这些结果可能适用于其他低温流体。

This document specifies the metrological and technical requirements for flowmeters intended to be used for the dynamic measurement of liquefied natural gas (LNG) and other refrigerated hydrocarbon fluids. For LNG static volume measurement used in custody transfer, see ISO 10976. This document sets the best practice for the proper selection and installation of flowmeters in cryogenic applications and identifies the specific issues that can affect the performance of the flowmeter in use. Moreover, it offers a calibration guideline for laboratory and on-site conditions (mass or volume) by either using LNG or other reference fluids. The choice of calibration fluid will depend on the capabilities of the available flow calibration facilities and the ability to achieve the required overall measurement uncertainty demanded by the intended application. This document is applicable, but is not limited, to the use of Coriolis and ultrasonic flowmeters for dynamic measurements of LNG. In principle, LNG and other refrigerated liquid hydrocarbons are considered in this document. Recommendations in this document are based on the available test results with LNG. These results are probably applicable to other cryogenic fluids.