标准摘要
[中文适用范围]： 本文件规定了超声波气体流量计 (USM) 的要求和建议，超声波气体流量计利用声信号的传输时间来测量封闭管道中单相均质气体的流量。 本文件适用于用于贸易交接和分配计量的传输时间超声波气体流量计，例如全通径、缩小面积、高压和低压流量计或这些流量计的任意组合。 仪表的最小或最大尺寸没有限制。 本文件可应用于几乎任何类型气体的测量，例如空气、天然气和乙烷。 其中包括适用于贸易交接和分配测量等应用的两种精度等级仪表的流量测量性能要求。 本文件规定了用于气体流量测量的超声波流量计的结构、性能、校准、仪表检定诊断和输出特性，并讨论了安装条件。 注：可能存在比本文件中的规定更严格的国家或其他法规。 [外文原描述]： This document specifies requirements and recommendations for ultrasonic gas flowmeters (USMs), which utilize the transit time of acoustic signals to measure the flow of single phase homogenous gases in closed conduits. This document applies to transit time ultrasonic gas flowmeters used for custody transfer and allocation metering, such as full-bore, reduced-area, high-pressure, and low-pressure meters or any combination of these. There are no limits on the minimum or maximum sizes of the meter. This document can be applied to the measurement of almost any type of gas, such as air, natural gas, and ethane. Included are flow measurement performance requirements for meters of two accuracy classes suitable for applications such as custody transfer and allocation measurement. This document specifies construction, performance, calibration, diagnostics for meter verification, and output characteristics of ultrasonic meters for gas flow measurement and deals with installation conditions. NOTE It is possible that national or other regulations apply which can be more stringent than those in this document.
英文名称Measurement of fluid flow in closed conduits — Ultrasonic meters for gas — Part 1: Meters for custody transfer and allocation measurement