BS EN ISO 5167-1:2022

What is ISO 5167-1 - Measurement of fluid flow about?

ISO 5167-1 is the international standard is the first in a six-part series on measuring fluid flow using pressure differential devices.

ISO 5167-1:2022 deals with general principles and requirements and has been revised to implement minor corrections, harmonize changes across the series and achieve consistency with the Guide to Uncertainty of Measurement (GUM).

Who is ISO 5167-1 - Measurement of fluid flow for?

• Manufacturers of pressure differential devices

• Those working with this equipment in the natural gas industry, from chief mechanical engineer or chief metrologist to operators and technicians

• Anyone measuring other gases or liquids (Newtonian fluids) including e.g. hydrogen or carbon dioxide

What does ISO 5167-1 - Measurement of fluid flow cover?

This part of ISO 5167 defines terms and symbols and establishes the general principles for methods of measurement and computation of the flowrate of fluid flowing in a conduit by means of pressure differential devices (orifice plates, nozzles, Venturi tubes, cone meters, and wedge meters) when they are inserted into a circular cross-section conduit running full.

ISO 5167-1 also specifies the general requirements for methods of measurement, installation and determination of the uncertainty of the measurement of flowrate and defines the general specified limits of pipe size and Reynolds number for which these pressure differential devices are to be used.

NOTE: ISO 5167 (all parts) applies only to flow that 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.

Why should you use ISO 5167-1 - Measurement of fluid flow?

• This standard is reliable and proven, describing a robust approach and an enduringly effective framework for measuring fluid flow
• ISO 5167-1 incorporates revisions that improve, refine, update and future-proof the standard
• Use of the standard can improve efficiency and help manage risk

ISO 5167-1 contributes to UN Sustainable Development Goal 7 on affordable and clean energy.

What’s new about ISO 5167-1 - Measurement of fluid flow?

BS EN ISO 5167-1:2022 is a revision of BS EN ISO 5167-1:2003. The major changes in BS EN ISO 5167-1:2022 are:

1. There is improved consistency between this Part and the other five in the series (some items that were new in Parts 5 and 6 have been moved to Part 1)
2. A primary element is set as part of a differential pressure flowmeter system
3. A short section on diagnostics and CBM (Condition Based Monitoring) is included
4. A limitation on the use of the 5 % 2° rule for an acceptable profile is noted
5. Improved text about uncertainty calculation and an example in an annex are provided
6. Annexes on turndown and permanent pressure loss are included