ISO 5167-4:2003 用压差装置测量管道循环交叉液体流量-第4部分：文氏管道

标准编号：ISO 5167-4:2003

中文名称：用压差装置测量管道循环交叉液体流量-第4部分：文氏管道

英文名称：Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 4: Venturi tubes

发布日期：2003-03

标准范围

ISO 5167-4:2003规定了文丘里管插入满管管道时的几何形状和使用方法（安装和操作条件），以确定管道中流动的流体流速。ISO 5167-4:2003还提供了计算流量的背景信息，并适用于ISO 5167-1中给出的要求。ISO 5167-4:2003仅适用于文丘里管，在文丘里管中，流量在整个测量段内保持亚音速，且流体可视为单相。此外，这些装置只能在管道尺寸、粗糙度、直径比和雷诺数的规定范围内使用。ISO 5167-4:2003不适用于脉动流量的测量。它不包括在尺寸小于50 mm或大于1200 mm的管道中使用文丘里管，或在管道雷诺数低于20 000的情况下使用文丘里管。ISO 5167-4:2003涉及三种典型的文丘里管:铸铁、机加工和粗焊铁皮。文丘里管是一种装置，它由一个与圆柱形喉部相连的收敛入口组成，而圆柱形喉部又与一个称为“发散”的锥形膨胀段相连。三种经典文丘里管流量系数的不确定度值之间的差异一方面显示了每种经典文丘里管的可用结果数量，另一方面显示了几何轮廓的或多或少精确定义。这些数值基于多年前收集的数据。文丘里管喷嘴（和其他喷嘴）在ISO 5167-3中进行了说明。

ISO 5167-4:2003 specifies the geometry and method of use (installation and operating conditions) of Venturi tubes when they are inserted in a conduit running full to determine the flowrate of the fluid flowing in the conduit.ISO 5167-4:2003 also provides background information for calculating the flow-rate and is applicable in conjunction with the requirements given in ISO 5167-1.ISO 5167-4:2003 is applicable only to Venturi tubes in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. In addition, each of these devices can only be used within specified limits of pipe size, roughness, diameter ratio and Reynolds number. ISO 5167-4:2003 is not applicable to the measurement of pulsating flow. It does not cover the use of Venturi tubes in pipes sized less than 50 mm or more than 1 200 mm, or for where the pipe Reynolds numbers are below 20 000.ISO 5167-4:2003 deals with the three types of classical Venturi tubes: cast, machined and rough welded sheet-iron.A Venturi tube is a device which consists of a convergent inlet connected to a cylindrical throat which is in turn connected to a conical expanding section called the "divergent". The differences between the values of the uncertainty of the discharge coefficient for the three types of classical Venturi tube show, on the one hand, the number of results available for each type of classical Venturi tube and, on the other hand, the more or less precise definition of the geometric profile. The values are based on data collected many years ago. Venturi nozzles (and other nozzles) are dealt with in ISO 5167-3.

标准预览图