Foreword

Introduction

1 Scope

2 Normative references

3 Terms, definitions and symbols

3.1 Terms and definitions

3.1.1 Quantities

3.1.2 Meter design

3.1.3 Thermodynamic conditions

3.1.4 Statistics

3.2 Symbols and subscripts

3.3 Abbrevations

4 Principles of measurement

4.1 Basic formulae

4.2 Factors affecting the performance

4.3 Description of generic types

4.3.1 General

4.3.2 Transducers

4.3.3 Meter body and acoustic path configurations

4.3.4 Average velocity calculation

4.4 Contributions to the uncertainty in measurement

4.5 Reynolds number

4.6 USM classification

5 Meter characteristics

5.1 Operating conditions

5.1.1 Flow rates and gas velocities

5.1.2 Pressure

5.1.3 Temperature

5.1.4 Gas quality

5.2 Meter body, materials, and construction

5.2.1 Materials

5.2.2 Meter body

5.2.3 Connections

5.2.4 Dimensions

5.2.5 Ultrasonic transducer ports

5.2.6 Pressure tappings

5.2.7 Anti-roll provision

5.2.8 Flow conditioner

5.2.9 Markings

5.2.10 Corrosion protection

5.3 Transducers

5.3.1 Specification

5.3.2 Rate of pressure change

5.3.3 Transducer characterization

5.3.4 Path configuration

5.3.5 Marking

5.3.6 Cable

5.3.7 Robustness

5.4 Electronics

5.4.1 General requirements

5.4.2 Display

5.4.3 Power supply

5.4.4 Signal detection method

5.4.5 Sampling or pulsating flow

5.4.6 Signal-to-noise ratio

5.4.7 Alarm signal

5.4.8 Processing of data

5.4.9 Output

5.4.10 Cable jackets and insulation

5.4.11 Marking

5.5 Software

5.5.1 Firmware

5.5.2 MODBUS communication data specification

5.5.3 Discontinuity

5.5.4 Marking and version management

5.5.5 Monitoring and recording of measuring and diagnostic data

5.5.6 Correction functions and parameters

5.5.7 Inspection and verification functions

5.6 Exchange of components

5.7 Secondary measurements

5.7.1 General

5.7.2 Pressure measurement

5.7.3 Temperature measurement

5.8 Performance requirements

5.8.1 General

5.8.2 Accuracy requirements

5.8.3 Influence of pressure, temperature, and gas composition

5.9 Operation and installation requirements

5.9.1 General

5.9.2 Operational requirements

5.9.3 Installation requirements

5.9.4 Manual handling and transportation

5.10 Documentation

5.10.1 General

5.10.2 Generic meter documentation

5.10.3 Particular meter documentation

6 Test and calibration

6.1 Pressure testing and leakage testing

6.2 Individual testing — Static testing

6.2.1 General

6.2.2 Timing and time delays

6.2.3 Zero flow verification test

6.3 Individual testing — Flow calibration

6.3.1 General

6.3.2 Laboratory flow calibration

6.3.3 Judging the measurement performance of the meter

6.3.4 Adjustment and records

7 Type testing

7.1 General

7.2 Accuracy

7.3 Installation conditions

7.4 Path failure simulation and exchange of components

7.5 Electronics design testing

8 Audit trail and diagnostics for meter verification

8.1 General

8.2 USM Lifecycle Process

8.3 Production and Factory Acceptance Test

8.4 Initial Flow Calibration

8.5 Site installation and site acceptance test

8.6 Operation

8.7 Diagnostic warning and alarm levels in operation

8.7.1 MSOS and MSOS ratios warning & alarm levels

8.7.2 Velocity ratios warning & alarm levels

8.7.3 S/N ratios warning & alarm levels

8.8 Service and recalibration

8.8.1 General

8.8.2 Service Related Diagnostics

8.9 Diagnostic parameters

8.9.1 Speed of sound

8.9.2 Automatic gain control

8.9.3 Signal-to-noise ratio (S/N)

8.9.4 Acoustic signal acceptance

8.9.5 Flow profile

8.9.6 Standard deviation/turbulence

9 Operational practice

9.1 Temperature and pressure correction

9.1.1 Correction for the temperature

9.1.2 Correction for the pressure

Annex A (informative) Registration of error bands

Annex B (informative) Derivation and correction of USM errors

Annex C (informative) Valve characterization and noise in a metering and regulating station

Annex D (informative) The calibration time of ultrasonic flow meters

Annex E (informative) Detailed calculation of geometry-related temperature and pressure corrections

Annex F (normative) MODBUS communication data specification

Annex G (informative) Disturbance tests

Bibliography

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ISO 17089-1:2019

Gulf StandardGSO ISO 17089-1:2022

GSO ISO 17089-1:2022Gulf Standard

GSO ISO 17089-1:2022

ISO 17089-1:2019

مواصفة قياسية خليجية

قياس تدفق الموائع في قنوات مغلقة - عدادات الموجات فوق الصوتية للغاز - الجزء الاول: عدادات لقياس نقل وتوزيع الغازات

Gulf Standard

Measurement of fluid flow in closed conduits — Ultrasonic meters for gas — Part 1: Meters for custody transfer and allocation measurement

ICS:

17.120.10

English Language – اللغةالإنجليزيةEdition 2 – 12/05/2022 – 2 الطبعة

هذه الوثيقة محمية بالقانون

ما لم ينص على خلاف ذلك، لا يجوز إعادة إنتاج أي جزء من هذا المنشور أو استخدامه بأي شكل آخر أو بأي وسيلة، إلكترونية أو ميكانيكية، بما في ذلك التصوير، أو النشر على الإنترنت أو الإنترانت، دون إذن كتابي مسبق من هيئة التقييس لدول مجلس التعاون لدول الخليج العربية على العنوان أدناه أو الدول الأعضاء في الهيئة داخل بلدانهم.

All rights reserved to GCC Standardization Organization (GSO). Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either GSO at the address below or GSO's member body in the country of the requester.

Outreach Dept, Knowledge Management Section

GCC Standardization Organization (GSO)

P.O.Box: 85245 Riyadh 12511

Kingdom of Saudi Arabia

إدارة التواصل، قسم إدارة المعرفة

هيئة التقييس لدول مجلس التعاون لدول الخليج العربية (GSO)

ص. ب: 85245 الرياض 12511

المملكة العربية السعودية

Tel:

+966115208000

:هاتف

Fax:

+966115208010

:فاكس

E-Mail:

csc@gso.org.sa

:بريد إلكتروني

Website:

www.gso.org.sa

:موقع ويب

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ISO 17089-1:2019

Gulf StandardGSO ISO 17089-1:2022

GSO ISO 17089-1:2022Gulf Standard

Gulf Foreword

GCC Standardization Organization (GSO) is a regional organization which consists of the national standardization bodies of GCC member states. One of GSO main functions is to issue gulf standards and technical regulations through specialized technical committees.

GSO Technical Council in its meeting number (52) held on 10/10/1443 H, which corresponds to 12/05/2022, has approved the update of Gulf Standard GSO ISO 17089-1:2022 titled "Measurement of fluid flow in closed conduits — Ultrasonic meters for gas — Part 1: Meters for custody transfer and allocation measurement" in English language which was studied and adopted from International Organization for Standardization Standard ISO 17089-1:2019 without any technical modifications through the technical program of GSO Technical Committee for Metrology (TC04) in KUWAIT schedule . This document will cancel and replace the Gulf Standard GSO ISO 17089-1:2016.

تقديم خليجي

هيئة التقييس لدول مجلس التعاون لدول الخليج العربية هيئة إقليمية تضم في عضويتها أجهزة التقييس الوطنية في الدول الأعضاء ، ومن مهام الهيئة إعداد المواصفات القياسية واللوائح الفنية الخليجية بواسطة لجان فنية متخصصة.

قرر المجلس الفني لهيئة التقييس لدول مجلس التعاون لدول الخليج العربية في الاجتماع الـ (52) بتاريخ 1443/10/10 هـ ،الموافق 2022/05/12م اعتماد تحديث المواصفة القياسية الخليجية رقم GSO ISO 17089-1:2022 وعنوانها "قياس تدفق الموائع في قنوات مغلقة - عدادات الموجات فوق الصوتية للغاز - الجزء الاول: عدادات لقياس نقل وتوزيع الغازات" باللغة الانجليزية التي تم دراستها وتبنيها عن المنظمة الدولية للتقييس رقم ISO 17089-1:2019 بدون إدخال تعديلات فنية عليها ضمن برنامج عمل اللجنة الفنية الخليجية لمواصفات المقاييس (TC04) المدرجة في خطة دولة الكويت . على أن تلغي وتحل محل المواصفة القياسية رقم GSO ISO 17089-1:2016 .

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ISO 17089-1:2019(en)

Gulf StandardGSO ISO 17089-1:2022

GSO ISO 17089-1:2022Gulf Standard

	International Standard ISO 17089-1
Measurement of fluid flow in closed conduits — Ultrasonic meters for gas — Part 1: Meters for custody transfer and allocation measurement Mesurage du débit des fluides dans les conduites fermées — Compteurs à ultrasons pour gaz — Partie 1: Compteurs pour transactions commerciales et allocations Reference number ISO 17089-1:2019(en)	Second edition 2019-08 © ISO 2019

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ISO 17089-1:2019(en)

Gulf StandardGSO ISO 17089-1:2022

GSO ISO 17089-1:2022Gulf Standard

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of the requester.

ISO copyright office

CP 401 • Ch. de Blandonnet 8

CH-1214 Vernier, Geneva

Tel. + 41 22 749 01 11

E-mail copyright@iso.org

Website www.iso.org

Published in Switzerland

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GSO ISO 17089-1:2022Gulf Standard

ContentsPage

Foreword

Introduction

1 Scope

2 Normative references

3 Terms, definitions and symbols

3.1 Terms and definitions

3.1.1 Quantities

3.1.2 Meter design

3.1.3 Thermodynamic conditions

3.1.4 Statistics

3.2 Symbols and subscripts

3.3 Abbrevations

4 Principles of measurement

4.1 Basic formulae

4.2 Factors affecting the performance

4.3 Description of generic types

4.3.1 General

4.3.2 Transducers

4.3.3 Meter body and acoustic path configurations

4.3.4 Average velocity calculation

4.4 Contributions to the uncertainty in measurement

4.5 Reynolds number

4.6 USM classification

5 Meter characteristics

5.1 Operating conditions

5.1.1 Flow rates and gas velocities

5.1.2 Pressure

5.1.3 Temperature

5.1.4 Gas quality

5.2 Meter body, materials, and construction

5.2.1 Materials

5.2.2 Meter body

5.2.3 Connections

5.2.4 Dimensions

5.2.5 Ultrasonic transducer ports

5.2.6 Pressure tappings

5.2.7 Anti-roll provision

5.2.8 Flow conditioner

5.2.9 Markings

5.2.10 Corrosion protection

5.3 Transducers

5.3.1 Specification

5.3.2 Rate of pressure change

5.3.3 Transducer characterization

5.3.4 Path configuration

5.3.5 Marking

5.3.6 Cable

5.3.7 Robustness

5.4 Electronics

5.4.1 General requirements

5.4.2 Display

5.4.3 Power supply

5.4.4 Signal detection method

5.4.5 Sampling or pulsating flow

5.4.6 Signal-to-noise ratio

5.4.7 Alarm signal

5.4.8 Processing of data

5.4.9 Output

5.4.10 Cable jackets and insulation

5.4.11 Marking

5.5 Software

5.5.1 Firmware

5.5.2 MODBUS communication data specification

5.5.3 Discontinuity

5.5.4 Marking and version management

5.5.5 Monitoring and recording of measuring and diagnostic data

5.5.6 Correction functions and parameters

5.5.7 Inspection and verification functions

5.6 Exchange of components

5.7 Secondary measurements

5.7.1 General

5.7.2 Pressure measurement

5.7.3 Temperature measurement

5.8 Performance requirements

5.8.1 General

5.8.2 Accuracy requirements

5.8.3 Influence of pressure, temperature, and gas composition

5.9 Operation and installation requirements

5.9.1 General

5.9.2 Operational requirements

5.9.3 Installation requirements

5.9.4 Manual handling and transportation

5.10 Documentation

5.10.1 General

5.10.2 Generic meter documentation

5.10.3 Particular meter documentation

6 Test and calibration

6.1 Pressure testing and leakage testing

6.2 Individual testing — Static testing

6.2.1 General

6.2.2 Timing and time delays

6.2.3 Zero flow verification test

6.3 Individual testing — Flow calibration

6.3.1 General

6.3.2 Laboratory flow calibration

6.3.3 Judging the measurement performance of the meter

6.3.4 Adjustment and records

7 Type testing

7.1 General

7.2 Accuracy

7.3 Installation conditions

7.4 Path failure simulation and exchange of components

7.5 Electronics design testing

8 Audit trail and diagnostics for meter verification

8.1 General

8.2 USM Lifecycle Process

8.3 Production and Factory Acceptance Test

8.4 Initial Flow Calibration

8.5 Site installation and site acceptance test

8.6 Operation

8.7 Diagnostic warning and alarm levels in operation

8.7.1 MSOS and MSOS ratios warning & alarm levels

8.7.2 Velocity ratios warning & alarm levels

8.7.3 S/N ratios warning & alarm levels

8.8 Service and recalibration

8.8.1 General

8.8.2 Service Related Diagnostics

8.9 Diagnostic parameters

8.9.1 Speed of sound

8.9.2 Automatic gain control

8.9.3 Signal-to-noise ratio (S/N)

8.9.4 Acoustic signal acceptance

8.9.5 Flow profile

8.9.6 Standard deviation/turbulence

9 Operational practice

9.1 Temperature and pressure correction

9.1.1 Correction for the temperature

9.1.2 Correction for the pressure

Annex A (informative) Registration of error bands

Annex B (informative) Derivation and correction of USM errors

Annex C (informative) Valve characterization and noise in a metering and regulating station

Annex D (informative) The calibration time of ultrasonic flow meters

Annex E (informative) Detailed calculation of geometry-related temperature and pressure corrections

Annex F (normative) MODBUS communication data specification

Annex G (informative) Disturbance tests

Bibliography

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 30, Measurement of fluid flow in closed conduits, Subcommittee SC 5, Velocity and mass methods.

This second edition cancels and replaces the first edition (ISO 17089-1:2010), which has been technically revised. The main changes compared to the previous edition are as follows:

—

Clause 3 has been revised;

—

Formulae have been corrected throughout the document;

—

editorial and terminological changes throughout the document;

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Introduction

Ultrasonic meters (USMs) for gas flow measurement have penetrated the market for meters rapidly since 2000 and have become one of the prime flowmeter concepts for operational use as well as custody transfer and allocation measurement. Next to the high repeatability and high accuracy, ultrasonic technology has inherent features like: negligible pressure loss; high rangeability; and the capability to handle pulsating flows.

USMs can deliver extended diagnostic information through which it may be possible to demonstrate the functionality of an USM. Also, the measured speed of sound of the USM may be compared with the speed of sound calculated from pressure, temperature, and gas composition, to check the mutual consistency of the four instruments involved. Due to the extended diagnostic capabilities, this document advocates the addition and use of automated diagnostics instead of labour-intensive quality checks.

This document focuses on meters for custody transfer and allocation measurement (class 1 and class 2 meters). Meters for industrial gas applications, such as utilities and process, as well as flare gas and vent measurement, is the subject of ISO 17089-2.

Typical performance factors of the classification scheme are:

Class	Typical applications	Required accuracy class	Reference
1	Custody transfer	class 0.5 or class 1.0	This document
2	Allocation	class 1.5	This document
3	Utilities and process		ISO 17089-2
4	Flare gas and vent gas		ISO 17089-2

Typical configurations for class 1 and class 2 meters are multi-path meters with chords at different radial positions.

Typical configurations for class 3 and class 4 meters are single-path meters, meters with only diametrical paths, insertion type meters, household type, stack or chimney type, and flare type meters.

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ISO 17089-1:2019(en)

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GSO ISO 17089-1:2022Gulf Standard

International StandardISO 17089-1:2019(en)

Measurement of fluid flow in closed conduits — Ultrasonic meters for gas —

Part 1:

Meters for custody transfer and allocation measurement

1Scope

This document specifies requirements and recommendations for ultrasonic gas flowmeters (USMs), which utilize the transit time of acoustic signals to measure the flow of single phase homogenous gases in closed conduits.

This document applies to transit time ultrasonic gas flowmeters used for custody transfer and allocation metering, such as full-bore, reduced-area, high-pressure, and low-pressure meters or any combination of these. There are no limits on the minimum or maximum sizes of the meter. This document can be applied to the measurement of almost any type of gas, such as air, natural gas, and ethane.

Included are flow measurement performance requirements for meters of two accuracy classes suitable for applications such as custody transfer and allocation measurement.

This document specifies construction, performance, calibration, diagnostics for meter verification, and output characteristics of ultrasonic meters for gas flow measurement and deals with installation conditions.

NOTEIt is possible that national or other regulations apply which can be more stringent than those in this document.

2Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

lSO 4006, Measurement of fluid flow in closed conduits — Vocabulary and symbols

ISO 5168, Measurement of fluid flow — Procedures for the evaluation of uncertainties

ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories

3Terms, definitions and symbols

3.1Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4006 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

—

ISO Online browsing platform: available at https://www.iso.org/obp

—

IEC Electropedia: available at http://www.electropedia.org/

3.1.1Quantities

3.1.1.1

volume flow rate

q_{V} = \frac{d V}{d t}

where
	V	is volume
	t	is time

3.1.1.2

pressure

absolute gas pressure in a meter under flowing conditions to which the indicated volume of gas is related

3.1.1.3

average velocity

volume flow rate divided by the cross-sectional area

3.1.2Meter design

3.1.2.1

meter body

pressure-containing structure of the meter

3.1.2.2

acoustic path

path travelled by an acoustic signal between a pair of ultrasonic transducers

3.1.2.3

axial path

path travelled by an acoustic signal entirely in the direction of the main pipe axis

Note 1 to entry: An axial path can be both on or parallel to the centre-line or long axis of the pipe, see Figure 1.

Figure 1 — Axial path

3.1.2.4

diametrical path

acoustic path whereby the acoustic signal travels through the centre-line or long axis of the pipe

Note 1 to entry: See Figure 2 for a representation.

Figure 2 — Diametrical paths

3.1.2.5

chordal path

acoustic path whereby the acoustic signal travels parallel to the diametrical path

Note 1 to entry: See Figure 3 for a representation.

Figure 3 — Chordal paths

3.1.3Thermodynamic conditions

3.1.3.1

metering conditions

conditions, at the point of measurement, of the fluid whose volume is to be measured

Note 1 to entry: Metering conditions include gas composition, gas temperature, and gas pressure.

[SOURCE: ISO 9951:1993, 3.1.6, modified — the term fluid is used instead of gas.]

3.1.3.2

base conditions

conditions to which the measured volume of the fluid is converted

Note 1 to entry: Base conditions include base temperature and base pressure.

[SOURCE: ISO 9951:1993, 3.1.7, modified — the term fluid is used instead of gas.]

3.1.4Statistics

3.1.4.1

measurement error

the error of measurement is the measured quantity value minus a reference quantity value

[SOURCE: ISO/IEC Guide 99:2007, 2.16]

EXAMPLE Measured quantity value of meter under test minus quantity value of reference meter.

3.1.4.2

calibration curve

set of measurmement errors, at a number of different flow rates, with respect to a known reference quantity meter

3.1.4.3

maximum permissible error

extreme value of measurement error, with respect to a known reference quantity value, permitted by specifications or regulations for a given operational range of the meter

[SOURCE: ISO/IEC Guide 99:2007, 4.26, modified — the term measurement has been removed from the definition, thus the current term can be abbribivated by MPE.]

3.1.4.4

maximum peak-to-peak error

maximum difference between any two error values

3.1.4.5

repeatability

closeness of the agreement between the results of successive measurements of the same measurand carried out under the same conditions of measurement

Typical values of the coverage factor k95 are:

Measurements taken	3	5	7	10	100	∞
Coverage factor k95	4,53	2,87	2,52	2,32	2,02	2,00

Note 1 to entry: The repeatability shall be calculated in absolute terms for the meter error as the type A uncertainty in a single measurement (UAS) according to ISO 5168. The coverage factor k95 shall be derived from the Student’s distribution for a 95,45 % confidence level depending on the number of measurements taken. See ISO 5168:2005, Table C.1.

r_{p} = U_{A S} = k_{95} \sqrt{\frac{\sum_{i = 1}^{n} {(E_{i} - \bar{E})}^{2}}{(n - 1)}}

3.1.4.6

reproducibility

closeness of the agreement between the results of measurements of the same measurand carried out under changed conditions of measurement

3.1.4.7

resolution

smallest difference between indications of a meter that can be meaningfully distinguished

[SOURCE: ISO 11631:1998, 3.28, modified — the term meter has been replaced by flowmeter.]

3.1.4.8

zero flow reading

flow-velocity reading when the gas is assumed to be at rest, i.e. both the axial and non-axial velocity components are essentially zero

3.1.4.9

linearization

way of reducing the non-linearity and offset of the ultrasonic meter readingby applying corrections in the software

Note 1 to entry: The linearization can be applied to meter electronics or in a flow computer connected to the USM. The correction can be, for example, piece-wise linearization or polynomial linearization.

3.2Symbols and subscripts

The symbols and subscripts used in this document are given in Tables 1 and 2. Examples of uses of the volume flow rate symbol are given in Table 3.

Table 1 — Symbols

Quantity	Symbol	Dimensionsa	SI unit
Cross-sectional area	A	L2	m2
Speed of sound in fluid	c	LT−1	m/s
Outside pipe diameter	D	L	m
Inside diameter of the meter body	d	L	m
Modulus of elasticity; Young modulus meter body	E	ML−1T−2	MPa
Modulus of elasticity; Young modulus tranducer	Et	ML−1T−2	MPa
Indicated flow error	Ei	—	1
Weighting factor (live inputs)	fi	—	1
Integers (1, 2, 3, …)	i, j, n	—	1
Impulse factor	I	L−3	m−3
Calibration factor	K	—	1
Body style factor	Ks	—	1
Body end correction factor	KE	—	1
Velocity distribution correction factor	kh	—	1
Flange stiffening factor	Kf	—	1
Minimum distance to a specified upstream flow disturbance	lmin	L	m
Typical averaging length in the ultrasonic flow meter	LAV	L	m
Noise amplitude	Lp	—	dB
Path length	lp	L	m
Attenuation factor	Nd	—	1
Valve-weighting factor	Nv	—	1
Absolute pressure	p	ML−1T−2	Pa
Pressure difference	Δp	ML−1T−2	Pa
Emitted acoustic pressure	pn	ML−1T−2	Pa
Signal strength of the USM	Ps	ML−1T−2	Pa
Volume flow rate	qV	L3T−1	m3/s
Outside pipe radius	R	L	m
Inside pipe radius	r	L	m
Reynolds number	Re	—	1
Repeatability	rp	—	1
Repeatability during calibration	rcal	—	1
Absolute temperature of the gas	T	Θ	K
Temperature difference	ΔT	Θ	K
Time	t	T	s
Standard deviation of the instantaneous turbulent scatter	u*	—	1
standard deviation of the required turbulent scatter after averaging	ud	—	1
Velocity	v	LT−1	m/s
Average velocity	$\bar{v}$	LT−1	m/s
Velocity of the acoustic path i	vi	LT−1	m/s
Volume	V	L3	m3
Weighting factor (fixed value)	wI	—	1
Compressibility	Z	—	1
Coefficient of thermal expansion	α	Θ−1	K−1
Error at a flow rate qV,i	Δi	—	%
Pipe wall thickness	δ	L	M
Dynamic viscosity	η	L−1MT−1	Pa⋅s
Wavelength of ultrasonic oscillation	λ	L	M
Poisson ratio	μ	—	1
Density of fluid	ρ	ML−3	kg/m3
Sensing point for pressure measurement	pm	—	—
Path angle	ϕ	—	rad
aM ≡ mass; L ≡ length; T ≡ time; Θ ≡ temperature.

Table 2 — Subscripts

Subscript	Meaning
cal	calibration
min	minimum
max	maximum
op	operational
t	transition

Table 3 — Examples of flow rate symbols

Symbol	Meaning
qV, max, 20	Designed maximum flow rate, designed for maximum gas speed of 20 m/s
qV, max, x	Designed maximum flow rate, designed for maximum gas speed of x m/s
qV, max, op	Operational maximum flow rate; defined only when smaller than designed maximum
qV, max, cal	Highest flow rate calibrated; defined only when smaller than operational maximum
qV, min	Designed minimum flow rate
qV, t	Transition flow rate for defining accuracy requirements

3.3Abbrevations

CMC	calibration and measurement capability
ES	electronics system
FAT	factory acceptance test
FC	flow conditioner
FWME	flow-weighted mean error
M&R	metering and regulating stations
MPE	Maximum permissible error
MSOS	measured speed of sound
SAT	Site Acceptance Test
S/N	signal-to-noise ratio
SOS	speed of sound
TSOS	theoretical speed of sound
USM	ultrasonic flow meter
USMP	USM package, including meter tubes, flow conditioner, and thermowell
USM(P)	USM and USMP

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ISO 17089-1:2019(en)

Gulf StandardGSO ISO 17089-1:2022

GSO ISO 17089-1:2022Gulf Standard

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30mm

20mm

15mm

10mm

17mm

Gulf StandardGSO ISO 17089-1:2022

GSO ISO 17089-1:2022Gulf Standard


ICS 17.120.10 Price based on 114 pages © ISO 2019All rights reserved	iso.org