ISO 17089-1-2019 PDF

Full title and description

Measurement of fluid flow in closed conduits — Ultrasonic meters for gas — Part 1: Meters for custody transfer and allocation measurement. This international standard specifies requirements, performance criteria and recommendations for transit‑time ultrasonic gas flowmeters used for custody transfer and allocation metering of single‑phase homogeneous gases in closed conduits.

Abstract

ISO 17089‑1:2019 covers transit‑time ultrasonic gas flowmeters (USMs) and defines construction, performance, calibration and verification, diagnostics, output characteristics and installation conditions for meters used in custody transfer and allocation measurement. It includes meter performance requirements for two accuracy classes and is applicable to full‑bore, reduced‑area, high‑pressure and low‑pressure meters with no restriction on meter size; typical gases include natural gas, air and hydrocarbon gases. The standard notes that national or regulatory requirements may be more stringent.

General information

• Status: Published (International Standard).
• Publication date: 23 August 2019.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 17.120.10 (Flow in closed conduits).
• Edition / version: Edition 2 (2019).
• Number of pages: 114 (ISO edition; national reprints may vary in page count).

Basic bibliographic and lifecycle details are recorded on the ISO catalogue entry for ISO 17089‑1:2019.

Scope

Applies to transit‑time ultrasonic meters for measuring the flow of single‑phase homogeneous gases in closed conduits when used for custody transfer or allocation measurement. The scope covers meter types (full‑bore, reduced‑area, field‑mounted transducers, etc.), performance and accuracy classes, requirements for construction and materials, calibration and verification methods, diagnostic and self‑monitoring functions, output signals and data, and installation considerations (including influence of flow conditioning and upstream/downstream disturbances). The document is intended to be generic with no limits on meter size or the particular gas being measured, while acknowledging that local regulations may impose additional requirements.

Key topics and requirements

• Transit‑time measurement principle and measurement equations for ultrasonic gas flowmeters.
• Defined performance/accuracy classes and associated uncertainty and flow range requirements.
• Mechanical and electronic construction, materials, and environmental requirements for custody transfer use.
• Calibration, verification and acceptance testing procedures and documentation requirements.
• On‑board diagnostics, fault detection, self‑monitoring functions and required alarm/flagging behaviour.
• Required output characteristics, data formats and recommended communication interfaces for metering systems.
• Installation and site‑conditioning guidance to minimise measurement errors (pipework, upstream/downstream requirements, flow conditioners).

These topics reflect the core technical and practical requirements described in the standard.

Typical use and users

Typical uses: custody transfer and allocation gas metering for utilities and hydrocarbon transport, commercial gas trading points, and high‑accuracy flow measurement applications. Typical users: gas meter manufacturers, gas transmission/distribution companies, metering system integrators, calibration and test laboratories, operators and asset owners, procurement teams, and regulatory bodies responsible for fiscal metering. Users consult the standard when designing, specifying, procuring, installing, commissioning or verifying ultrasonic gas meters.

Related standards

ISO 17089 is a multi‑part series. Relevant related documents include ISO 17089‑2 (meters for industrial applications, earlier edition published 2012 with a revised committee draft in development) and earlier national adoptions/revisions (for example the 2010 edition of ISO 17089‑1, which was replaced by the 2019 edition). Other related standards and technical reports on flow measurement, metering data exchange and custody transfer procedures may be referenced in national/regulatory frameworks.

Keywords

ultrasonic gas meter; transit‑time; custody transfer; allocation measurement; gas metering; flow measurement; calibration; diagnostics; accuracy class; installation; ISO/TC 30/SC 5.

FAQ

Q: What is this standard?

A: ISO 17089‑1:2019 is the international standard that specifies requirements and recommendations for transit‑time ultrasonic gas flowmeters used for custody transfer and allocation measurement of single‑phase homogeneous gases.

Q: What does it cover?

A: It covers meter performance and accuracy classes, construction and material requirements, calibration and verification procedures, diagnostics and output characteristics, and installation considerations for ultrasonic gas meters used in fiscal and allocation metering.

Q: Who typically uses it?

A: Meter manufacturers, gas transmission and distribution companies, metering system integrators, calibration and testing laboratories, operators, procurement teams and regulators involved in fiscal gas measurement and custody transfer.

Q: Is it current or superseded?

A: ISO 17089‑1:2019 is the current ISO edition published in August 2019; it replaced ISO 17089‑1:2010. The ISO catalogue entry shows the 2019 publication as the active international standard. Users should check national/regulatory updates or later ISO revisions for changes after 2019.

Q: Is it part of a series?

A: Yes — ISO 17089 is a multi‑part series addressing ultrasonic meters for gas; Part 1 covers custody transfer and allocation measurement, Part 2 addresses industrial applications (existing editions and committee drafts cover different application focuses).

Q: What are the key keywords?

A: Ultrasonic, transit‑time, gas meter, custody transfer, allocation, accuracy, calibration, diagnostics, installation, flow in closed conduits.