用插入圆形横截面管道中的压差装置测量流体流量.第5部分:锥形流量计

[中文适用范围]： 本文件规定了锥度流量计的几何形状和使用方法（安装和操作条件），当锥度流量计插入完全运行的管道中时，以确定管道中流动的流体的流速。 由于未校准的锥形流量计的不确定度对于特定应用来说可能太高，因此可能认为有必要根据第 7 条校准流量计。 本文件还提供了计算流量的背景信息，并与ISO 5167-1 中给出的要求。 本文件仅适用于锥形流量计，其中流量在整个测量部分保持亚音速并且流体可被视为单相。 未经校准的锥度计只能在管道尺寸、粗糙度 β 和雷诺数 Re 的指定限制内使用。 本文件不适用于脉动流量的测量。 它不包括在尺寸小于 50 毫米或大于 500 毫米的管道中，或管道雷诺数低于 8 × 104 或大于 1,2 × 107 的情况下使用未经校准的锥度计。 锥度计是主要设备它由一个圆锥形限制装置组成，该限制装置同心地固定在管道中心，圆锥体的前端位于上游。 本文件中定义的锥体流量计的设计在壁中具有一个或多个上游测压孔，并且下游测压孔位于锥体的背面，与差压变送器的连接是穿过锥体到支撑件的孔杆，然后向上穿过支撑杆。 可提供圆锥流量计的替代设计；然而，在撰写本文时，没有足够的数据来完全表征这些设备，因此，这些仪表应根据第 7 条进行校准。 [外文原描述]： This document specifies the geometry and method of use (installation and operating conditions) of cone meters when they are inserted in a conduit running full to determine the flow rate of the fluid flowing in the conduit. As the uncertainty of an uncalibrated cone meter might be too high for a particular application, it might be deemed essential to calibrate the flow meter in accordance with Clause 7. This document also provides background information for calculating the flow rate and is applicable in conjunction with the requirements given in ISO 5167‑1. This document is applicable only to cone meters in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. Uncalibrated cone meters can only be used within specified limits of pipe size, roughness, β , and Reynolds number, Re . This document is not applicable to the measurement of pulsating flow. It does not cover the use of uncalibrated cone meters in pipes sized less than 50 mm or more than 500 mm, or where the pipe Reynolds numbers are below 8 × 10 4 or greater than 1,2 × 10 7 . A cone meter is a primary device which consists of a cone-shaped restriction held concentrically in the centre of the pipe with the nose of the cone upstream. The design of cone meter defined in this document has one or more upstream pressure tappings in the wall, and a downstream pressure tapping positioned in the back face of the cone with the connection to a differential pressure transmitter being a hole through the cone to the support bar, and then up through the support bar. Alternative designs of cone meters are available; however, at the time of writing, there is insufficient data to fully characterize these devices, and therefore, these meters shall be calibrated in accordance with Clause 7.