ISO 5167-3:2003 用压差装置测量管道循环交叉液体流量.第3部分：喷嘴和文氏管喷嘴

标准编号：ISO 5167-3:2003

中文名称：用压差装置测量管道循环交叉液体流量.第3部分：喷嘴和文氏管喷嘴

英文名称：Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 3: Nozzles and Venturi nozzles

发布日期：2003-03

标准范围

ISO 5167-3:2003规定了喷嘴和文丘里管喷嘴插入满管时的几何形状和使用方法（安装和操作条件），以确定管道中流动流体的流速。ISO 5167-3:2003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 5167-3:2003适用于喷嘴和文丘里管喷嘴，在这些喷嘴和文丘里管喷嘴中，流量在整个测量段内保持亚音速，且流体可视为单相。此外，每个装置只能在规定的管道尺寸和雷诺数范围内使用。它不适用于脉动流量的测量。它不包括在小于50 mm或大于630 mm的管道中，或在雷诺数低于10000的管道中使用喷嘴和文丘里喷嘴。ISO 5167-3:2003涉及两种标准喷嘴，ISA 1932喷嘴和长半径喷嘴，以及文丘里喷嘴。这两种类型的标准喷嘴基本上是不同的，在ISO 5167-3:2003中分别进行了描述。文丘里管喷嘴与ISA 1932喷嘴具有相同的上游面，但具有发散截面，因此，下游取压口的位置不同，将单独描述。这种设计比类似的喷嘴具有更低的压力损失。对于这两种喷嘴和文丘里管喷嘴，已经进行了直接校准实验，其数量、范围和质量足以使应用的相干系统基于其结果和系数，并给出一定的可预测不确定度限值。

ISO 5167-3:2003 specifies the geometry and method of use (installation and operating conditions) of nozzles and Venturi nozzles when they are inserted in a conduit running full to determine the flow-rate of the fluid flowing in the conduit.ISO 5167-3:2003 also provides background information for calculating the flow-rate and is applicable in conjunction with the requirements given in ISO 5167-1.ISO 5167-3:2003 is applicable to nozzles and Venturi nozzles in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. In addition, each of the devices can only be used within specified limits of pipe size and Reynolds number. It is not applicable to the measurement of pulsating flow. It does not cover the use of nozzles and Venturi nozzles in pipe sizes less than 50 mm or more than 630 mm, or for pipe Reynolds numbers below 10 000.ISO 5167-3:2003 deals with two types of standard nozzles, the ISA 1932 nozzle and the long radius nozzle, as well as the Venturi nozzle.The two types of standard nozzle are fundamentally different and are described separately in ISO 5167-3:2003. The Venturi nozzle has the same upstream face as the ISA 1932 nozzle, but has a divergent section and, therefore, a different location for the downstream pressure tappings, and is described separately. This design has a lower pressure loss than a similar nozzle. For both of these nozzles and for the Venturi nozzle direct calibration experiments have been made, sufficient in number, spread and quality to enable coherent systems of application to be based on their results and coefficients to be given with certain predictable limits of uncertainty.

标准预览图