DIN EN ISO 5167-6 E 2022-01 PDF

Full title and description

STB DIN EN ISO 5167-6 E 2022-01 — Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 6: Wedge meters. This document specifies the geometry, installation, operating conditions, calculation principles and calibration requirements for wedge (wedge‑type) differential‑pressure primary elements used to determine flow rate in full, circular pipes.

Abstract

This part of ISO 5167 gives the design and method of use for wedge meters (keel/wedge-shaped primary elements). It covers the equations and parameters needed to compute flow from a measured differential pressure, provides guidance on uncertainty and on when an uncalibrated meter is acceptable, and sets out requirements for calibration where needed. The document applies only to subsonic, single‑phase flow and limits the applicability of uncalibrated wedge meters by pipe size, β (wedge ratio) and Reynolds number.

General information

• Status: Published (current).
• Publication date: October 2022 (ISO edition 2; national adoptions followed later in 2022–2024).
• Publisher: International Organization for Standardization (ISO); adopted as EN ISO / national standards (e.g., BSI, DIN adoptions exist).
• ICS / categories: 17.120.10 (Flow in closed conduits).
• Edition / version: Edition 2 (2022).
• Number of pages: ISO PDF: 13 pages (note: some national/BS/EN publications show different pagination, e.g., BSI/EN editions use different front/back matter and list ~22 pages).

Scope

Specifies geometry, installation and operating conditions, methods to compute flow from differential pressure produced by wedge meters, and requirements for calibration and uncertainty assessment. It is applicable to wedge meters where flow remains subsonic and the fluid is single‑phase; it excludes some pipe sizes and Reynolds‑number ranges for uncalibrated use (see the standard for the precise numerical limits). The standard is intended to be used in conjunction with ISO 5167‑1 (general principles and uncertainty procedures).

Key topics and requirements

• Definition and recommended geometry of wedge meters (wedge ratio β, wedge gap, throat area, nose orientation).
• Installation requirements and straight‑run/upstream–downstream placement to minimise disturbances.
• Calculation of flow from measured differential pressure using the discharge coefficient C and expansibility/temperature corrections.
• Limits of applicability for uncalibrated wedge meters (pipe diameter and Reynolds number bounds), and requirement to calibrate when uncertainty would be excessive (Clause 7).
• Procedures for reporting uncertainty and traceable calibration conditions (reference to ISO 5167‑1 for uncertainty method).
• Notes on alternative wedge designs — where insufficient characterization exists the device must be calibrated per the standard.

Typical use and users

Used by flow‑measurement engineers, instrumentation and control engineers, calibration laboratories, flow‑meter manufacturers, process engineers and pipeline operators. Common applications include industrial process flow monitoring, custody‑transfer applications when calibrated, and laboratory or test installations assessing primary element performance. Wedge meters are selected where a robust primary element with known behaviour and acceptable head loss is required and where the operating conditions fall within the standard’s applicability limits.

Related standards

ISO 5167 is a multi‑part series; closely related parts and documents include ISO 5167‑1 (general principles and uncertainty), and the other parts covering orifice plates, nozzles and venturi/cone meters (ISO 5167‑2 to ‑5). National adoptions as EN ISO / DIN EN ISO versions exist and should be consulted for local implementation rules.

Keywords

wedge meter; wedge‑type flowmeter; differential pressure; primary element; discharge coefficient; calibration; Reynolds number; β (wedge ratio); expansibility; ISO 5167 series.

FAQ

Q: What is this standard?

A: It is ISO 5167‑6 (Edition 2, 2022), the part of the ISO 5167 series that defines wedge (wedge‑type) differential‑pressure primary elements for measuring fluid flow in full, circular conduits.

Q: What does it cover?

A: Geometry and manufacture recommendations, installation and operating conditions, calculation methods (including discharge coefficient and corrections), calibration requirements and guidance on uncertainty and limits of applicability for uncalibrated use.

Q: Who typically uses it?

A: Instrumentation and process engineers, flow‑meter manufacturers, metrology/calibration labs, pipeline and utilities operators, and anyone specifying or installing wedge meters for process measurement or custody applications.

Q: Is it current or superseded?

A: Current — Edition 2 published in 2022 supersedes the 2019 edition; users should apply the 2022 text (and follow any applicable national/EN implementation notes). Check your national standards body publication for the adopted EN/DIN/BS text and effective date.

Q: Is it part of a series?

A: Yes — ISO 5167 is a series (parts 1–6) covering differential‑pressure primary elements in circular conduits; ISO 5167‑1 contains general principles, symbols and uncertainty methods referenced by the other parts.

Q: What are the key keywords?

A: wedge meter, differential pressure, discharge coefficient, calibration, Reynolds number, β‑ratio, primary element, ISO 5167.