ISO 5167-6 is a part of a series of standards that deals with measuring fluid flow in pipes. It specifically focuses on a type of flow sensor called “averaged flow sensor” or “multi-hole orifice plate.” These sensors are placed inside the pipe to measure the flowrate of the fluid passing through it.
This standard provides guidelines on how to design, install, and use these flow sensors correctly for accurate measurements. It works together with ISO 5167-1, which covers the general principles of flow measurement using orifice plates. By following ISO 5167-6, industries can ensure reliable and standardized flow measurements, leading to more precise and consistent results.
ISO 5167-6 PDF Download
iso-5167-6-2022Wedge meters
This article is about ISO 5167-6 Measurement of fluid flow by means of Wedge meters of pressure differential devices inserted in circular cross-section conduits running full.
Wedge meters are flow measurement devices used to determine the flow rate of fluid in a pipeline. These meters consist of a wedge-shaped restriction placed inside the pipe. When fluid flows through the meter, it encounters the wedge, causing a pressure difference that can be measured to calculate the flow rate.
The ISO 5167-6 standard provides guidelines for the geometry and proper use of wedge meters. It specifies installation and operating conditions to ensure accurate measurements. If an uncalibrated wedge meter has a high level of uncertainty, it is essential to calibrate it according to the standard’s requirements for reliable results.
Wedge meters are suitable for measuring subsonic flow in single-phase fluids. They have specific limitations in terms of pipe size, roughness, wedge ratio (β), and Reynolds number. This standard does not cover their use in small or large pipes, or in cases where the Reynolds number is below a certain value.
It is worth noting that while alternative designs of wedge meters exist, ISO 5167-6 focuses on the specific geometry and requirements for calibrated wedge meters to ensure accurate flow measurements.
Read Also:
- ISO 5167-1 Download PDF – Measurement of fluid flow by means of pressure differential devices Part 1
- ISO 5167-2 Download PDF – Orifice plates
- ISO 5167-3 PDF Download – Nozzles and Venturi nozzles
- ISO 5167-4 PDF Download – Venturi tubes
- ISO 5167-5 PDF Download – Cone meters
FAQs:
Calibration is essential because the uncertainty of an uncalibrated wedge meter might be too high for certain applications. Clause 7 provides the necessary requirements for calibration, ensuring accurate flow measurement within the calibrated Reynolds number range.
ISO 5167-6 is applicable only to wedge meters where the flow remains subsonic throughout the measuring section and the fluid is single-phase. Wedge meters can be used within specified limits of pipe size, roughness, β (or wedge ratio), and Reynolds number. They are not suitable for measuring pulsating flow and are not recommended for use in pipes with internal diameters less than 50 mm or greater than 600 mm, or where the pipe Reynolds numbers are below 1 × 104.
A wedge meter consists of a primary element with a wedge-shaped restriction of specific geometry. Although alternative designs of wedge meters exist, there is currently insufficient data to fully characterize these devices. Therefore, they should be calibrated according to Clause 7 for accurate flow measurement.