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AS ISO 5167.1:2023
[Current]Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full, Part 1: General principles and requirements
AS ISO 5167.1:2023 identically adopts ISO 5167 1:2022, which defines terms and symbols and establishes the general principles for methods of measurement and computation of the flow rate of fluid flowing in a conduit by means of pressure differential devices when they are inserted into a circular cross-section conduit running full. Also specifies the general requirements for methods of measurement, installation and determination of the uncertainty of the measurement of flow rate
Published: 30/06/2023
Pages: 42
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
3.1 Pressure measurement
3.2 Primary devices
3.3 Flow
4 Symbols and subscripts
4.1 Symbols
5 Principle of the method of measurement and computation
5.1 Principle of the method of measurement
5.2 Method of determination of the required diameter ratio for the selected standard primary device
5.3 Computation of flow rate
5.4 Determination of density, pressure and temperature
5.4.1 General
5.4.2 Density
5.4.3 Static pressure
5.4.4 Temperature
5.4.4.1
5.4.4.2
5.5 Differential pressure flow measurement system
5.5.1 General
5.5.2 Primary device
5.5.3 Impulse lines and transmitters
5.5.4 Impulse line isolation valves and valve manifolds
5.5.5 Flow computer
5.6 Differential pressure flow measurement system design considerations
5.6.1 Flow rate turndown and stacked transmitters
5.6.2 Meter calibration
5.6.3 Permanent pressure loss
5.6.4 Diagnostics and meter verification
5.6.5 Overall uncertainty of differential pressure metering system
6 General requirements for the measurements
6.1 Primary device
6.1.1
6.1.2
6.1.3
6.2 Nature of the fluid
6.2.1
6.2.2
6.3 Flow conditions
6.3.1
6.3.2
6.3.3
7 Installation requirements
7.1 General
7.1.1
7.1.2
7.1.3
7.1.4
7.1.5
7.1.6
7.1.7
7.2 Minimum upstream and downstream straight lengths
7.2.1
7.2.2
7.3 General requirement for flow conditions at the primary device
7.3.1 Requirement
7.3.2 Swirl-free conditions
7.3.3 Good velocity profile conditions
7.4 Flow conditioners
7.4.1 Compliance testing
7.4.1.1
7.4.1.2
7.4.1.3
7.4.1.4
7.4.1.5
7.4.1.6
7.4.1.7
7.4.2 Specific test
8 Uncertainties on the measurement of flow rate
8.1 General
8.2 Definition of uncertainty
8.2.1
8.2.2
8.2.3
8.2.4
8.3 Practical computation of the uncertainty
8.3.1 Component uncertainties
8.3.1.1
8.3.1.2
8.3.1.3
8.3.1.4
8.3.2 Practical working formula
8.3.2.1
8.3.2.2
8.3.2.3
8.3.2.4
8.3.2.5
8.3.2.6
8.3.2.7
Annex A
Annex B
Annex C
C.1 General
C.2 Flow straighteners
C.3 Flow conditioners
C.4 Conformity testing
Annex D
D.1 Differential pressure transmitters
D.2 Turndown
D.3 Differential pressure meter flow range factors
D.3.1 General
D.3.2 Meter type
D.3.3 Diameter ratio
D.3.4 Structural integrity
D.3.5 Permanent pressure loss
D.3.6 Flow conditions
D.3.7 Differential pressure range
D.3.8 Adjustable flow ranges
D.4 Comparing meter turndowns
Annex E
E.1 Meter setup
E.2 Uncertainty and sensitivity of parameters
E.2.1 General
E.2.2 Discharge coefficient, C
E.2.3 Expansibility, ε
E.2.4 Differential pressure, Δp
E.2.5 Orifice diameter, d
E.2.6 Upstream pipe diameter, D
E.2.7 Mass density, ρ1
E.2.8 Combining the uncertainties
Annex F
Bibliography
Cited references in this standard
[Current]
Uncertainty of measurement - Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) - SUPPLEMENT 2: Extension to any number of output quantities
ISO 5167 (all parts)
Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full
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