BS ISO 17089-1:2019
$215.11
Measurement of fluid flow in closed conduits. Ultrasonic meters for gas – Meters for custody transfer and allocation measurement
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 126 |
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.
It is possible that national or other regulations apply which can be more stringent than those in this document.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 8 | Foreword |
| 9 | Introduction |
| 11 | 1 Scope 2 Normative references 3 Terms, definitions and symbols 3.1 Terms and definitions |
| 12 | 3.1.1 Quantities 3.1.2 Meter design |
| 13 | 3.1.3 Thermodynamic conditions 3.1.4 Statistics |
| 15 | 3.2 Symbols and subscripts |
| 17 | 3.3 Abbrevations 4 Principles of measurement 4.1 Basic formulae |
| 19 | 4.2 Factors affecting the performance 4.3 Description of generic types 4.3.1 General 4.3.2 Transducers |
| 20 | 4.3.3 Meter body and acoustic path configurations |
| 22 | 4.3.4 Average velocity calculation |
| 23 | 4.4 Contributions to the uncertainty in measurement 4.5 Reynolds number 4.6 USM classification |
| 24 | 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 |
| 25 | 5.2 Meter body, materials, and construction 5.2.1 Materials 5.2.2 Meter body 5.2.3 Connections 5.2.4 Dimensions |
| 26 | 5.2.5 Ultrasonic transducer ports 5.2.6 Pressure tappings 5.2.7 Anti-roll provision |
| 27 | 5.2.8 Flow conditioner 5.2.9 Markings |
| 28 | 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 |
| 29 | 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 |
| 30 | 5.4.9 Output 5.4.10 Cable jackets and insulation 5.4.11 Marking 5.5 Software 5.5.1 Firmware |
| 31 | 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 |
| 32 | 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 |
| 34 | 5.8 Performance requirements 5.8.1 General 5.8.2 Accuracy requirements |
| 35 | 5.8.3 Influence of pressure, temperature, and gas composition |
| 36 | 5.9 Operation and installation requirements 5.9.1 General 5.9.2 Operational requirements |
| 37 | 5.9.3 Installation requirements |
| 40 | 5.9.4 Manual handling and transportation 5.10 Documentation 5.10.1 General 5.10.2 Generic meter documentation |
| 41 | 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 |
| 42 | 6.3 Individual testing — Flow calibration 6.3.1 General 6.3.2 Laboratory flow calibration |
| 45 | 6.3.3 Judging the measurement performance of the meter 6.3.4 Adjustment and records |
| 47 | 7 Type testing 7.1 General |
| 48 | 7.2 Accuracy 7.3 Installation conditions |
| 49 | 7.4 Path failure simulation and exchange of components 7.5 Electronics design testing |
| 50 | 8 Audit trail and diagnostics for meter verification 8.1 General 8.2 USM Lifecycle Process |
| 52 | 8.3 Production and Factory Acceptance Test 8.4 Initial Flow Calibration |
| 53 | 8.5 Site installation and site acceptance test 8.6 Operation |
| 54 | 8.7 Diagnostic warning and alarm levels in operation 8.7.1 MSOS and MSOS ratios warning & alarm levels |
| 55 | 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 |
| 56 | 8.8.2 Service Related Diagnostics |
| 57 | 8.9 Diagnostic parameters 8.9.1 Speed of sound |
| 59 | 8.9.2 Automatic gain control 8.9.3 Signal-to-noise ratio (S/N) |
| 60 | 8.9.4 Acoustic signal acceptance 8.9.5 Flow profile 8.9.6 Standard deviation/turbulence |
| 61 | 9 Operational practice 9.1 Temperature and pressure correction 9.1.1 Correction for the temperature |
| 63 | 9.1.2 Correction for the pressure |
| 68 | Annex A (informative) Registration of error bands |
| 69 | Annex B (informative) Derivation and correction of USM errors |
| 73 | Annex C (informative) Valve characterization and noise in a metering and regulating station |
| 84 | Annex D (informative) The calibration time of ultrasonic flow meters |
| 90 | Annex E (informative) Detailed calculation of geometry-related temperature and pressure corrections |
| 112 | Annex F (normative) MODBUS communication data specification |
| 118 | Annex G (informative) Disturbance tests |
| 120 | Bibliography |
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BS ISO 17089-1:2019 – TC:2020 Edition
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