ISO 5167-3:2022
Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 3: Nozzles and Venturi nozzles
Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 3: Nozzles and Venturi nozzles
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 42
- Дата публикации:
- 11 октября 2022 г.
- Издание:
- ISO IS 5167 edition 3 version 1
- ICS:
- 17.120.10
This document specifies the geometry and method of use (installation and operating conditions) of nozzles and Venturi nozzles when they are inserted in a conduit running full to determine the flowrate of the fluid flowing in the conduit. This document also provides background information for calculating the flowrate and is applicable in conjunction with the requirements given in ISO 5167‑1. This document is applicable to nozzles and Venturi nozzles in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. In addition, each of the devices can only be used within specified limits of pipe size and Reynolds number. It is not applicable to the measurement of pulsating flow. It does not cover the use of nozzles and Venturi nozzles in pipe sizes less than 50 mm or more than 630 mm, or where the pipe Reynolds numbers are below 10 000. This document deals with a) three types of standard nozzles: 1) ISA 1932[1] nozzle; 2) the long radius nozzle[2]; 3) the throat-tapped nozzle b) the Venturi nozzle. The three types of standard nozzle are fundamentally different and are described separately in this document. The Venturi nozzle has the same upstream face as the ISA 1932 nozzle, but has a divergent section and, therefore, a different location for the downstream pressure tappings, and is described separately. This design has a lower pressure loss than a similar nozzle. For all of these nozzles and for the Venturi nozzle direct calibration experiments have been made, sufficient in number, spread and quality to enable coherent systems of application to be based on their results and coefficients to be given with certain predictable limits of uncertainty. [1] ISA is the abbreviation for the International Federation of the National Standardizing Associations, which was superseded by ISO in 1946. [2] The long radius nozzle differs from the ISA 1932 nozzle in shape and in the position of the pressure tappings.
Abstract
Overview - ISO 5167-3:2022 (Nozzles & Venturi nozzles)
ISO 5167-3:2022 is the International Standard that specifies the geometry, installation, operating conditions, and use of nozzles and Venturi nozzles inserted in circular conduits running full to measure fluid flowrate by differential pressure. It is part of the ISO 5167 series and is intended for subsonic, single‑phase flows where direct calibration data exists to support reliable discharge coefficients and uncertainty statements.
Key scope limits:
- Applicable pipe diameters: 50 mm to 630 mm
- Minimum pipe Reynolds number: 10 000
- Not applicable to pulsating flows or supersonic conditions
- Used in conjunction with ISO 5167‑1 for general principles
Key technical topics and requirements
- Primary devices covered:
- ISA 1932 nozzle
- Long radius nozzle
- Throat‑tapped nozzle
- Venturi nozzle (ISA upstream face with divergent section)
- Geometry and manufacturing: detailed shapes, profiles, material and production tolerances for each nozzle type.
- Pressure tappings: specified locations and methods for upstream/downstream and throat pressure measurements.
- Installation requirements: minimum upstream/downstream straight lengths, fixing methods, carrier rings, gaskets, and pipe circularity/cylindricity.
- Flow conditioning: guidance on flow conditioners and when they are required to meet accuracy limits.
- Calibration and coefficients: direct flow calibration methodology, test facility expectations, reporting, and derivation of discharge coefficients with quantified uncertainties.
- Operating limits: Reynolds number ranges, expansibility (compressibility) considerations, and pressure‑loss information.
- Uncertainty analysis: harmonization with ISO/IEC Guide 98‑3 and requirements for assessing combined uncertainty from test facility and nozzle.
Practical applications and users
ISO 5167-3 is used to design, install, calibrate, and operate differential pressure flow meters (nozzles and Venturi nozzles) in industrial, municipal and process engineering contexts, including:
- Process and chemical plants measuring liquid or gas flow (single‑phase, subsonic)
- Power plants and utilities for plant flow monitoring
- Flow‑meter manufacturers and test laboratories performing flow calibration
- Instrumentation and piping engineers specifying meter installations and acceptance criteria
- Asset owners and operators who need traceable flow measurement with known uncertainty
Related standards
- ISO 5167‑1 - General principles for differential pressure devices
- ISO 5167 (other parts) - Orifice plates, Venturi tubes, cone and wedge meters
- ISO/IEC Guide 98‑3 - Uncertainty of measurement (GUM)
ISO 5167-3:2022 provides the authoritative technical requirements for using nozzles and Venturi nozzles as differential pressure devices, ensuring consistent flow measurement, traceable calibration, and predictable uncertainty across qualifying installations.
Технические детали
- Технический комитет
- ISO/TC 30/SC 2 - Pressure differential devices
- SKU
- ISO 5167-3:2022
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