Technological Innovation

What is BS EN ISO 5167-1:2016?

BS EN ISO 5167-1:2016 is an international standard that provides guidelines for the measurement of fluid flow using orifice plates, nozzles, and Venturi tubes. This standard specifies the requirements for geometrical and construction parameters, as well as the methods for calculating flow rate based on differential pressure measurements.

Understanding the Measurement Techniques

In order to accurately measure fluid flow, it is essential to understand the different measurement techniques outlined in BS EN ISO 5167-1:2016. Orifice plates are thin metal plates with a precisely engineered hole in the center. Nozzles, on the other hand, have a smooth convergent section that forces the fluid to accelerate. Meanwhile, Venturi tubes consist of a converging, throat, and diverging section that causes pressure recovery.

These devices work by creating a pressure difference across the flow element due to the obstruction or acceleration of the fluid. By measuring the differential pressure caused by this obstruction, it becomes possible to calculate the flow rate using equations provided in the standard.

Benefits of Compliance

Adhering to the guidelines outlined in BS EN ISO 5167-1:2016 offers several benefits. Firstly, it ensures accurate and consistent measurements, enabling reliable comparisons across different experiments or processes. This is particularly important in industries such as oil and gas, where precise measurements can have significant financial implications.

Secondly, compliance with this standard allows for the interchangeability of flow measurement instruments. The standardized calculation methods ensure that measurements made using different devices can be compared and validated. Additionally, it facilitates ease of calibration and troubleshooting by providing clear guidelines for installation and maintenance procedures.


BS EN ISO 5167-1:2016 is a vital standard for the accurate measurement of fluid flow. By following the guidelines outlined in this standard, industries can ensure consistent and reliable measurements while facilitating inter-exchangeability and ease of calibration. It serves as an essential tool for engineers and technicians involved in designing, operating, and maintaining processes that require precise flow measurements.


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