BS ISO 21903:2020
$198.66
Refrigerated hydrocarbon fluids. Dynamic measurement. Requirements and guidelines for the calibration and installation of flowmeters used for liquefied natural gas (LNG) and other refrigerated hydrocarbon fluids
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 56 |
This document specifies the metrological and technical requirements for flowmeters intended to be used for the dynamic measurement of liquefied natural gas (LNG) and other refrigerated hydrocarbon fluids. For LNG static volume measurement used in custody transfer, see ISO 10976.
This document sets the best practice for the proper selection and installation of flowmeters in cryogenic applications and identifies the specific issues that can affect the performance of the flowmeter in use.
Moreover, it offers a calibration guideline for laboratory and on-site conditions (mass or volume) by either using LNG or other reference fluids. The choice of calibration fluid will depend on the capabilities of the available flow calibration facilities and the ability to achieve the required overall measurement uncertainty demanded by the intended application.
This document is applicable, but is not limited, to the use of Coriolis and ultrasonic flowmeters for dynamic measurements of LNG.
In principle, LNG and other refrigerated liquid hydrocarbons are considered in this document. Recommendations in this document are based on the available test results with LNG. These results are probably applicable to other cryogenic fluids.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 7 | Foreword |
| 8 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Terms, definitions and abbreviated terms 3.1 Terms and definitions |
| 11 | 3.2 Abbreviated terms 4 Flowmeter selection 4.1 Considerations of meters specific to LNG metering |
| 12 | 4.2 Coriolis flowmeter 4.3 Ultrasonic flowmeter |
| 13 | 5 Process conditions 5.1 Temperature effects 5.1.1 Loading procedures 5.1.2 Temperature effects on CMF measurements |
| 14 | 5.1.3 Temperature effects on USM measurements 5.2 Pressure effects 5.2.1 Coriolis flowmeter |
| 15 | 5.2.2 Ultrasonic flowmeter 5.3 Mechanical vibrations 5.3.1 Coriolis flowmeter |
| 16 | 5.3.2 Ultrasonic flowmeter 5.4 Cavitation 5.4.1 Coriolis flowmeter |
| 17 | 5.4.2 Ultrasonic flowmeter 5.5 Thermodynamic properties of LNG 6 Installation 6.1 Valves 6.2 Swirl and non-uniform profiles 6.2.1 Coriolis flowmeter |
| 18 | 6.2.2 Ultrasonic flowmeter 6.3 Flow conditioners 6.4 Pipe stress and torsion 6.4.1 Coriolis flowmeter |
| 19 | 6.4.2 Ultrasonic flowmeter 6.5 Flowmeter installation recommendations 6.5.1 Coriolis flowmeter |
| 20 | 6.5.2 Ultrasonic flowmeter 6.6 Crosstalk and sensitivity to noise 6.6.1 Coriolis flowmeter 6.6.2 Ultrasonic flowmeter |
| 21 | 6.7 Zero offset — Verification and adjustment procedures 6.7.1 Coriolis flowmeter |
| 23 | 6.7.2 Ultrasonic flowmeter 6.8 Temperature management 6.8.1 Thermal insulation |
| 24 | 6.8.2 Cooling procedure |
| 25 | 6.8.3 Warming procedure |
| 26 | 7 Calibration 7.1 General considerations 7.2 Calibration in a laboratory 7.2.1 Gravimetric method |
| 28 | 7.2.2 Master meter method |
| 30 | 7.3 Calibration in situ 7.3.1 Gravimetric method using a weighbridge |
| 31 | 7.3.2 Road tanker temporarily on weighbridge 7.3.3 Measurement uncertainty 7.4 Interconnected pipe volume |
| 35 | Annex A (informative) Working principle Coriolis flowmeter |
| 38 | Annex B (informative) Working principle of the ultrasonic flowmeter |
| 41 | Annex C (normative) Hardware for an LNG calibration facility |
| 44 | Annex D (informative) Examples of calibration data |
| 47 | Annex E (normative) Alternative calibration procedure based on alternative liquids |
| 49 | Annex F (informative) Thermodynamic properties of LNG |
| 55 | Bibliography |
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