I.S. EN ISO 9300:2005
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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MEASUREMENT OF GAS FLOW BY MEANS OF CRITICAL FLOW VENTURI NOZZLES
Hardcopy , PDF
04-03-2023
English
01-01-2005
For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
Only cited Standards give presumption of conformance to New Approach Directives/Regulations.
Dates of withdrawal of national standards are available from NSAI.
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Foreword
1 Scope
2 Terms and definitions
2.1 Pressure measurement
2.2 Temperature measurement
2.3 Venturi nozzles
2.4 Flow
3 Symbols
4 Basic equations
4.1 State equation
4.2 Flow-rate under ideal conditions
4.3 Flow-rate under real conditions
4.4 Critical mass flux
5 Applications for which the method is suitable
6 Standard critical flow Venturi nozzles (CFVN)
6.1 General require
6.2 Design
7 Installation requirements
7.1 General
7.2 Upstream pipeline
7.3 Large upstream space
7.4 Downstream requirements
7.5 Pressure measurement
7.6 Drain holes
7.7 Temperature measurement
7.8 Density measurement
7.9 Calculated density
8 Calculation methods
8.1 Mass flow-rate
8.2 Discharge coefficient, C[d']
8.3 Critical flow function, C[*], and real gas
critical flow coefficient, C[R]
8.4 Conversion of measured pressure and temperature
to stagnation conditions
8.5 Maximum permissible downstream pressure
9 Uncertainties in the measurement of flow-rate
9.1 General
9.2 Practical computation of uncertainty
Annex A (normative) Venturi nozzle discharge coefficients
Annex B (normative) Tables of values for critical flow
function C[*] - Various gases
Annex C (normative) Computation of critical mass flux for
natural gas mixtures
Annex D (normative) Mass flow correction factor for
atmospheric air
Annex E (normative) Computation of critical mass flux for
critical flow nozzles with high
nozzle throat to upstream pipe diameter
ratio, beta > 0,25
Bibliography
Defines the geometry and method of use (installation in a system and operating conditions) of critical flow Venturi nozzles (CFVN) used to determine the mass flow-rate of a gas flowing through a system.
| DocumentType |
Standard
|
| Pages |
48
|
| PublisherName |
National Standards Authority of Ireland
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
| Standards | Relationship |
| ONORM EN ISO 9300 : 2005 | Identical |
| BS EN ISO 9300:2005 | Identical |
| UNI EN ISO 9300 : 2005 | Identical |
| DIN EN ISO 9300:2005-11 | Identical |
| NS EN ISO 9300 : 2ED 2005 | Identical |
| SN EN ISO 9300 : 2005 | Identical |
| NF EN ISO 9300 : 2005 | Identical |
| UNE-EN ISO 9300:2006 | Identical |
| NEN EN ISO 9300 : 2005 | Identical |
| NBN EN ISO 9300 : 2005 | Identical |
| ISO 9300:2005 | Identical |
| EN ISO 9300:2005 | Identical |
| ISO 6976:2016 | Natural gas — Calculation of calorific values, density, relative density and Wobbe indices from composition |
| ISO 5168:2005 | Measurement of fluid flow — Procedures for the evaluation of uncertainties |
| ISO 5167-2:2003 | Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 2: Orifice plates |
| ISO 5167-1:2003 | Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principles and requirements |
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