METROLOGICAL BEHAVIOUR OF BULK WATER METERS UNDER DIVERSE INSTALLATION CONFIGURATIONS

ABSTRACT As the correct measurement is an essential part of water management, this study describes the metrological behaviour of a range of bulk water meters under different installation configurations. The meters analysed included the horizontal and vertical Woltman, singlejet, tangential and proportional. Configurations included straight pipe lengths; gate and butterfly valves at different degrees of closure, rotations and distances from the meter; meter with volumetric and reducing valves; reverse installation; and meter rotated 90° from the horizontal setting. The metrological behaviour under different flow conditions was analysed by comparison with electromagnetic and volumetric meters (ISO-4064). The horizontal Woltman showed no permissible errors with reverse installation; gate valve closed 75% and placed alongside the meter; and with butterfly valve closed 30°, non-rotated, and rotated right or left. The vertical Woltman gave no permissible errors with reverse installation. The single-jet meter did not show any errors above the permitted limit. The tangential meter had no permissible errors with reverse installation and in almost all configurations with gate and butterfly valves. The proportional meter showed no permissible errors with a gate valve at any degree of closure.摘要 精准计量是水资源管理的核心环节，本研究针对多款大流量水表在不同安装配置下的计量特性展开系统性分析。本次分析的水表类型涵盖水平式螺翼水表（Woltman）、垂直式螺翼水表、单流束水表（singlejet）、切向式水表以及比例式水表。实验配置包括直管段长度变化、不同关闭开度、安装角度及安装间距的闸阀与蝶阀、配备容积式阀门与减压阀门的水表、反向安装工况，以及相对于水平安装位置旋转90°的安装方式。本研究以符合ISO-4064国际标准的电磁流量计与容积式流量计作为参照，对不同流量工况下各水表的计量特性进行评估。结果表明：水平式螺翼水表在反向安装、闸阀关闭至75%开度且紧邻水表安装、蝶阀关闭至30%开度且未旋转、向左或向右旋转的工况下，均未超出允许误差限；垂直式螺翼水表在反向安装工况下未超出允许误差限；单流束水表的计量误差全程未超出允许限值；切向式水表在反向安装以及几乎所有闸阀、蝶阀配置工况下均未超出允许误差限；比例式水表在闸阀任意开度的配置下均未超出允许误差限。