case study ISO 5167
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. ISO 5167 is the international standard covering the measurement and computation of the flow rate of fluids by means of pressure differential devices (orifice plates, nozzles and Venturi tubes). Over the last few decades, NEL has been at the forefront of the development, testing and validation of this standard and of the science and technology that relates to it. The money involved in dp flow measurement is enormous. Most flows can be measured using an orifice plate or a Venturi tube. In the UK, most natural gas is measured at least once using an orifice plate or other type of differential pressure meter. Users of this technology range from the Water Industry through Process and Petrochemical to the Oil and Gas Industry – and all industries in between. Each year approximately £25 billion of natural gas is metered in this way. Differential pressure meters have a long, proven track record. In addition, they are robust, can meter a wide range of different fluids and are simple to operate. This means that they remain the most widely used flow meter in the world. The International Standard ISO 5167-1 specifies the design of a number of different differential pressure flow meters that are used to measure flows within specified uncertainties without the requirement for calibration. This means that the equations used in ISO 5167 are of immense importance. The fact that the standard is used to “calibrate” the vast majority of these devices means an even greater onus is placed on its “correctness” than many other standards. Key pieces of research on ISO 5167 undertaken at NEL include: • Two equations are fundamental to ISO 5167. These are the discharge coefficient equation (the Reader- Harris/Gallagher (1998) Equation) and the expansibility factor equation. Both of these equations were derived at NEL. • In the last few years, both equations have been assessed at NEL and shown to deliver what they promise. Case Study Delivering a Flow Measurement Standard that Works Challenge Research
Transcript of case study ISO 5167
.
ISO 5167 is the international standard covering the measurement and computation of the flow rate of fluids by means of pressure differential devices (orifice plates, nozzles and Venturi tubes). Over the last few decades, NEL has been at the forefront of the development, testing and validation of this standard and of the science and technology that relates to it. The money involved in dp flow measurement is enormous. Most flows can be measured using an orifice plate or a Venturi tube.
In the UK, most natural gas is measured at least once using an orifice plate or other type of differential pressure meter. Users of this technology range from the Water Industry through Process and Petrochemical to the Oil and Gas Industry – and all industries in between. Each year approximately £25 billion of natural gas is metered in this way. Differential pressure meters have a long, proven track record. In addition, they are robust, can meter a wide range of different fluids and are simple to operate. This means that they remain the most widely used flow meter in the world.
The International Standard ISO 5167-1 specifies the design of a number of different differential pressure flow meters that are used to measure flows within specified uncertainties without the requirement for calibration. This means that the equations used in ISO 5167 are of immense importance. The fact that the standard is used to “calibrate” the vast majority of these devices means an even greater onus is placed on its “correctness” than many other standards.
Key pieces of research on ISO 5167 undertaken at NEL include:
• Two equations are fundamental to ISO 5167. These are the discharge coefficient equation (the Reader-Harris/Gallagher (1998) Equation) and the expansibility factor equation. Both of these equations were derived at NEL.
• In the last few years, both equations have been assessed at NEL and shown to deliver what they promise.
Case Study
Delivering a Flow
Measurement Standard that
Works
Challenge Research
A systematic record and an analysis of the experimental data on which ISO 5167 is based have been undertaken by NEL’s Michael Readeranalysis is based on an understanding of the physics of flow that the author has gained from experiments and computational fluid dynamics research undertaken during his career at NEL.
•
Reader-Harris’ work has been published at Plates and Venturi Tubes (Springer, 2015).enables the reader to estimate the effects of deviation from ISO 5167.
The book will be particularly useful for members of standards working groups and committees tasked with revising ISO 5167. It shows where the data can be found to justify each clause and how the data has been analysed. At present the author chairs BSI CPI 30/2 (differential pressure meters) and ISO/TC 30 (flow measurement). He has ensured that, in due course, his successors will be able to build on what he has achieved at NEL.
Thanks to NEL’s research, the ISO 5167 standard works - it delivers the required levels of precision and accuracy for both industry and the regulators.
It is not too restrictive and does not cause unnecessary expense to industry. It is sufficiently exacting and does not lead to the introduction of errors.
New NEL research has just been published that will underpin and facilitate any future revision of the standard.
Benefit
Results
A systematic record and an analysis of the experimental data on which ISO 5167 is based have been undertaken by NEL’s Michael Reader-Harris. The analysis is based on an understanding of the physics of flow that the author has gained from experiments and
mputational fluid dynamics research undertaken
Harris’ work has been published at Orifice
(Springer, 2015). This the reader to estimate the effects of deviation
The book will be particularly useful for members of standards working groups and committees tasked with revising ISO 5167. It shows where the data can be found to justify each clause and how the data has been
BSI CPI 30/2 (differential pressure meters) and ISO/TC 30 (flow measurement). He has ensured that, in due course, his successors will be able to build on what he has achieved at NEL.
Thanks to NEL’s research, the ISO 5167 standard delivers the required levels of precision and
accuracy for both industry and the regulators.
It is not too restrictive and does not cause unnecessary expense to industry. It is sufficiently exacting and does
EL research has just been published that will underpin and facilitate any future revision of the
For further information, contact:NEL, East Kilbride, Glasgow, G75 0QF, UK
Tel: + 44 (0) 1355 220222 Email: [email protected]
For further information, contact: NEL, East Kilbride, Glasgow, G75 0QF, UK
1355 220222 Email: [email protected] www.tuvnel.com
