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在国内的天然气贸易计量中,广泛使用旋转容积式流量计。基于测量原理,给出了在操作条件下,计量流量介于分界流量qt和最大流量qmax之间,流量计的最大允许误差,以及分界流量qt与流量计量程比的对应关系。基于相关国家标准,提出了流量计在外观、防腐、防爆、检验、配置等方面的技术要求,论述了流量计的使用环境、安装要求、相关配置、投运流程及维护和检定程序,罗列了体积流量、质量流量和能量流量的计算方法,以及各种流量和相关参数测量不确定度的估算方法。对如何提高天然气计量的准确性和可靠性进行了有益的探讨。
In the domestic gas trade measurement, widely used rotating volumetric flowmeter. Based on the principle of measurement, the corresponding relationship between the measured flow rate between the maximum flow qt and the maximum flow qmax under the operating conditions, the maximum allowable error of the flowmeter, and the ratio between the cutoff flow qt and the flowmeter is given. Based on relevant national standards, the technical requirements of the flowmeter in terms of appearance, anticorrosion, explosion-proof, inspection and configuration are put forward. The usage environment, installation requirements, relevant configuration, commissioning procedure, maintenance and verification procedure of the flowmeter are discussed. Volume flow, mass flow and energy flow calculation method, as well as a variety of flow and related parameters measurement uncertainty. How to improve the accuracy of gas measurement and reliability of a useful discussion.