ISO/TR 12767:2007 用压差装置测量流体流量 偏离ISO 5167给定的规范和操作条件的影响指南

标准编号：ISO/TR 12767:2007

中文名称：用压差装置测量流体流量 偏离ISO 5167给定的规范和操作条件的影响指南

英文名称：Measurement of fluid flow by means of pressure differential devices — Guidelines on the effect of departure from the specifications and operating conditions given in ISO 5167

发布日期：2007-09

标准范围

ISO/TR 12767提供了使用在ISO 5167范围外制造或操作的压差装置时，流量估算指南。附加公差或修正不一定能补偿偏离ISO 5167（所有零件）的影响。给出这些信息首先是为了通过描述不符合要求的一些影响，表明压差装置的制造、安装和维护所需的谨慎程度；第二，允许那些不能完全遵守要求的用户评估（无论多么粗略）流量误差的大小和方向。处理的每一个变异都被视为是唯一存在的变异。如果已知存在多个错误，则可能存在不可预测的交互作用，在结合这些错误的评估时必须小心。如果存在大量错误，则必须考虑消除其中一些错误的方法。ISO/TR 12767中包含的变化绝不完整，主要与孔板示例有关。文丘里管的示例已放在其部分的末尾。毫无疑问，有许多类似的安装实例不符合ISO 5167（所有部分）的要求，但没有公布可比数据。在ISO/TR 12767的未来版本中，可能会考虑来自用户、制造商和任何其他人的此类附加信息。

ISO/TR 12767 provides guidance on estimating the flowrate when using pressure differential devices constructed or operated outside the scope of ISO 5167.Additional tolerances or corrections cannot necessarily compensate for the effects of deviating from ISO 5167 (all parts). The information is given, in the first place, to indicate the degree of care necessary in the manufacture, installation and maintenance of pressure differential devices by describing some of the effects of non-conformity to the requirements; and in the second place, to permit those users who cannot comply fully with the requirements to assess, however roughly, the magnitude and direction of the resulting error in flowrate.Each variation dealt with is treated as though it were the only one present. Where more than one is known to exist, there may be unpredictable interactions and care has to be taken when combining the assessment of these errors. If there is a significant number of errors, means of eliminating some of them have to be considered. The variations included in ISO/TR 12767 are by no means complete and relate largely to examples with orifice plates. An example with Venturi tubes has been placed at the end of its section. There are, no doubt, many similar examples of installations not conforming to ISO 5167 (all parts) for which no comparable data have been published. Such additional information from users, manufacturers and any others may be taken into account in future revisions of ISO/TR 12767.

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