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Measurement of fluid flow in closed conduits — Guidelines on the effects of flow pulsations on flow-measurement instruments 封闭管道中流体流量的测量 - 流量脉动对流量计的影响指南
发布日期: 2018-03-15
ISO/TR 3313:2018定义了脉动流,将其与稳定流进行了比较,说明了如何检测脉动流,并描述了当这些设备用于测量管道中的流体流量时,脉动流对孔板、喷嘴或文丘里管、涡轮和涡街流量计的影响。这些特殊的流量计类型在本文件中具有特色,因为它们是最容易受到脉动影响的类型之一。针对可能出现这种情况的流量计类型,描述了针对这些影响产生的误差校正流量计输出信号的方法。如果无法纠正,则说明避免或减少问题的措施。这些措施包括安装脉动阻尼装置和/或选择不易受脉动影响的流量计类型。 ISO/TR 3313:2018适用于在位于流量计主要元件上游或下游的单一源处产生脉动的流量。 其适用范围仅限于测量段中的流向不反转,但对流量脉动波形没有限制的情况。本文件中的建议适用于液体和气体流量,尽管后者的有效性可能仅限于测量段密度变化较小的气体流量,如所讨论的特定类型流量计所示。
ISO/TR 3313:2018 defines pulsating flow, compares it with steady flow, indicates how it can be detected, and describes the effects it has on orifice plates, nozzles or Venturi tubes, turbine and vortex flowmeters when these devices are being used to measure fluid flow in a pipe. These particular flowmeter types feature in this document because they are amongst those types most susceptible to pulsation effects. Methods for correcting the flowmeter output signal for errors produced by these effects are described for those flowmeter types for which this is possible. When correction is not possible, measures to avoid or reduce the problem are indicated. Such measures include the installation of pulsation damping devices and/or choice of a flowmeter type which is less susceptible to pulsation effects. ISO/TR 3313:2018 applies to flow in which the pulsations are generated at a single source which is situated either upstream or downstream of the primary element of the flowmeter. Its applicability is restricted to conditions where the flow direction does not reverse in the measuring section but there is no restriction on the waveform of the flow pulsation. The recommendations within this document apply to both liquid and gas flows although with the latter the validity might be restricted to gas flows in which the density changes in the measuring section are small as indicated for the particular type of flowmeter under discussion.
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归口单位: ISO/TC 30/SC 2
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