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eLibrary > PD ISO/TR 12767:2023 - TC Tracked Changes. Measurement of fluid flow by means of pressure differential devices. Guidelines on the effect of departure from the specifications and operating conditions given in ISO 5167 >

PD ISO/TR 12767:2023 - TC Tracked Changes. Measurement of fluid flow by means of pressure differential devices. Guidelines on the effect of departure from the specifications and operating conditions given in ISO 5167, 2023

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PD ISO/TR 12767:2023 - TC Tracked Changes. Measurement of fluid flow by means of pressure differential devices. Guidelines on the effect of departure from the specifications and operating conditions given in ISO 5167, 2023

A-30464029.pdf [Go to Page]
National foreword
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Effect of errors on flowrate calculations [Go to Page]
5.1 General
5.2 Quantifiable effects
6 Effects of deviations in construction [Go to Page]
6.1 Orifice-plate edge sharpness
6.2 Thickness of orifice edge
6.3 Condition of upstream and downstream faces of orifice plate
6.4 Position of pressure tappings for an orifice [Go to Page]
6.4.1 General
6.4.2 Calculation of discharge coefficient
6.4.3 Estimation of additional uncertainty
6.4.4 Example
6.5 Condition of pressure tappings
7 Effects of pipeline near the meter [Go to Page]
7.1 Pipe diameter
7.2 Steps and taper sections
7.3 Diameter of carrier ring
7.4 Undersize joint rings
7.5 Protruding welds
7.6 Eccentricity
8 Effects of pipe layout [Go to Page]
8.1 General
8.2 Discharge coefficient compensation [Go to Page]
8.2.1 Corrections
8.2.2 Additional uncertainty
8.3 Pressure tappings
8.4 Devices for improving flow conditions
9 Operational deviations [Go to Page]
9.1 General
9.2 Deformation of an orifice plate [Go to Page]
9.2.1 General
9.2.2 Elastic deformation
9.2.3 Plastic deformation
9.3 Deposition on the upstream face of an orifice plate
9.4 Deposition in the meter tube
9.5 Orifice-plate edge sharpness [Go to Page]
9.5.1 Deterioration
9.5.2 Plate reversal
9.6 Deposition and increase of surface roughness in Venturi tubes [Go to Page]
9.6.1 General
9.6.2 Deposition
9.6.3 Surface roughness
10 Pipe roughness [Go to Page]
10.1 General
10.2 Upstream pipe
10.3 Downstream pipe
10.4 Reduction of roughness effects
10.5 Maintenance
Bibliography [Go to Page]

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PD ISO/TR 12767:2023 - TC Tracked Changes. Measurement of fluid flow by means of pressure differential devices. Guidelines on the effect of departure from the specifications and operating conditions given in ISO 5167, 2023

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