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Iso 5167 2 Orifice Plates Pdf Download

Iso 5167 2 Orifice Plates Pdf Download

If you are looking for a reliable and accurate method to measure the flow rate of fluids in circular conduits, you may be interested in the international standard ISO 5167-2, which specifies the geometry and method of use of orifice plates. Orifice plates are devices that create a pressure difference between two points in a conduit by reducing the cross-sectional area of the flow. By measuring this pressure difference, the flow rate can be calculated using the Bernoulli equation and other corrections. In this article, we will explain what ISO 5167-2 is, what are its benefits and limitations, and how you can download it as a PDF file.


What is ISO 5167-2?

ISO 5167-2 is the second part of the six-part series ISO 5167, which covers the measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full. The other parts are:

  • ISO 5167-1: General principles and requirements

  • ISO 5167-3: Nozzles and Venturi nozzles

  • ISO 5167-4: Venturi tubes

  • ISO 5167-5: Cone meters

  • ISO 5167-6: Wedge meters

ISO 5167-2 was first published in 2003 and revised in 2022. It applies to primary devices having an orifice plate used with flange pressure tappings, or with corner pressure tappings, or with D and D/2 pressure tappings. Other pressure tappings such as vena contracta and pipe tappings are not covered by this document. It also provides background information for calculating the flow rate and is applicable in conjunction with the requirements given in ISO 51671.

ISO 5167-2 is applicable only to a flow which remains subsonic throughout the measuring section and where the fluid can be considered as single phase. It is not applicable to the measurement of pulsating flow. It does not cover the use of orifice plates in pipe sizes less than 50 mm or more than 1 000 mm, or where the pipe Reynolds numbers are below 5 000.

What are the benefits and limitations of ISO 5167-2?

The main benefits of using ISO 5167-2 are:

  • It provides a standardized and widely accepted method for measuring fluid flow using orifice plates.

  • It ensures a high accuracy and repeatability of the flow measurement, provided that the installation and operating conditions are met.

  • It allows for a simple and economical design and installation of the orifice plates and pressure tappings.

  • It covers a wide range of fluid types, densities, viscosities, temperatures, pressures, and flow rates.

The main limitations of using ISO 5167-2 are:

  • It requires a sufficient length of straight pipe upstream and downstream of the orifice plate to ensure a fully developed and uniform flow profile.

  • It causes a permanent pressure loss in the conduit due to the contraction and expansion of the fluid.

  • It may not be suitable for fluids with high solids content, corrosive properties, or tendency to deposit on the orifice plate.

  • It may not be applicable to flows that are turbulent, swirling, pulsating, or affected by vibrations.

How to download ISO 5167-2 as a PDF file?

If you want to download ISO 5167-2 as a PDF file, you have two options:

  • You can buy it from the official website of ISO , where you can also find more information about the standard and its scope, normative references, terms and definitions, symbols and units, general principles, uncertainty of measurement, installation requirements, pressure tapping positions, calculation of discharge coefficient, calculation of uncertainty of discharge coefficient, calculation of flow rate, examples of calculation, annexes, bibliography, etc. The price of the PDF file is CHF 187.

  • You can download it for free from a third-party website , where you can also find other parts of ISO 5167 and related standards. However, you should be aware that this website is not affiliated with ISO and may not provide the latest or authentic version of the standard. Therefore, you should use it at your own risk and discretion.

We hope this article has helped you understand what ISO 5167-2 is and how you can download it as a PDF file. If you have any questions or comments, please feel free to contact us.

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