ISO 9644:2008
(Main)Agricultural irrigation equipment — Pressure losses in irrigation valves — Test method
Agricultural irrigation equipment — Pressure losses in irrigation valves — Test method
ISO 9644:2008 specifies a test method for determining the pressure loss in agricultural irrigation valves under steady-state conditions when water flows through them. The scope and accuracy of the valve performance specifications presented will assist agricultural irrigation system designers in comparing pressure losses through various types of valves.
Matériel agricole d'irrigation — Pertes de pression dans les vannes d'irrigation — Méthode d'essai
Oprema za namakanje kmetijskih površin - Izgube tlaka na ventilih cevovodov – Preskusna metoda
Ta mednarodni standard določa preskusno metodo za določanje izgube tlaka na ventilih kmetijskih cevovodov pri ustaljenih pogojih, ko skoznje teče voda. Področje uporabe in natančnost predstavljenih specifikacij delovanja ventilov bosta projektantom namakalnih sistemov pomagala pri primerjavi izgub tlaka pri različnih vrstah ventilov.
Merjenje izgub tlaka je način za določitev odnosa med izgubo tlaka in stopnjo pretoka skozi ventil.
Ta mednarodni standard tudi opisuje metodo za sporočanje ustreznih rezultatov preiskav. Uporaba, zasnova ali aplikacije proizvodov niso opredeljene. Preskusna metoda je primerna za ventile z dovodom in odvodom enakih nominalnih velikosti.
OPOMBA Če ni drugače določeno, se v enačbah uporabljajo enote SI, priporočene v standardu ISO 1000.
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST ISO 9644:2015
01-april-2015
1DGRPHãþD
SIST ISO 9644:1999
Oprema za namakanje kmetijskih površin - Izgube tlaka na ventilih cevovodov –
Preskusna metoda
Agricultural irrigation equipment - Pressure losses in irrigation valves - Test method
Matériel agricole d'irrigation - Pertes de pression dans les vannes d'irrigation - Méthode
d'essai
Ta slovenski standard je istoveten z: ISO 9644:2008
ICS:
65.060.35 Namakalna in drenažna Irrigation and drainage
oprema equipment
SIST ISO 9644:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ISO 9644:2015
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SIST ISO 9644:2015
INTERNATIONAL ISO
STANDARD 9644
Second edition
2008-07-01
Agricultural irrigation equipment —
Pressure losses in irrigation valves —
Test method
Matériel agricole d'irrigation — Pertes de pression dans les vannes
d'irrigation — Méthode d'essai
Reference number
ISO 9644:2008(E)
©
ISO 2008
---------------------- Page: 3 ----------------------
SIST ISO 9644:2015
ISO 9644:2008(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
COPYRIGHT PROTECTED DOCUMENT
© ISO 2008
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2008 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 9644:2015
ISO 9644:2008(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Terms and definitions. 1
3 Test installation. 3
3.1 Permissible deviation of measuring devices. 3
3.2 Test equipment . 3
4 Test procedure . 6
4.1 Test installation. 6
4.2 Test conditions . 6
4.3 Test bench pressure loss . 7
4.4 Test of valve . 8
5 Test results. 8
5.1 Presentation of test results . 8
5.2 Calculated valve coefficients. 8
5.3 Test report . 10
Bibliography . 11
© ISO 2008 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 9644:2015
ISO 9644:2008(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 9644 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and
forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems.
This second edition cancels and replaces the first edition (ISO 9644:1993), which has been technically revised.
It also incorporates the Amendment ISO 9644:1993/Amd 1:1998.
iv © ISO 2008 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 9644:2015
INTERNATIONAL STANDARD ISO 9644:2008(E)
Agricultural irrigation equipment — Pressure losses in
irrigation valves — Test method
1 Scope
This International Standard specifies a test method for determining the pressure loss in agricultural irrigation
valves under steady-state conditions when water flows through them. The scope and accuracy of the valve
performance specifications presented will assist agricultural irrigation system designers in comparing pressure
losses through various types of valves.
The measurement of pressure losses provides a means for determining the relationship between pressure
loss and flow rate through the valve.
This International Standard also describes the method of reporting pertinent test data.
No attempt is made to define product use, design or applications.
The test method is suitable for valves with equal inlet and outlet nominal sizes.
NOTE Unless otherwise specified, the equations are expressed in the SI units recommended by ISO 1000.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
nominal size
DN
conventional numerical designation used to indicate the size of an irrigation valve
NOTE It is expressed in millimetres, or in metres according to ISO 1000.
2.2
volume flow rate
flow rate
q
V
volume of water flowing through the valve per unit time
3 3
NOTE It is expressed in litres per second (l/s), cubic metres per hour (m /h), or in cubic metres per second (m /s)
according to ISO 1000.
© ISO 2008 – All rights reserved 1
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SIST ISO 9644:2015
ISO 9644:2008(E)
2.3
pressure loss
∆p
difference in pressure due to water flow between two specified points in a system or in part of a system
1)
NOTE It is expressed in pascals (Pa) according to ISO 1000, in kilopascals (kPa) or in bar .
2.4
piping pressure loss
∆p
p
pressure loss in the upstream and downstream portions of the test bench piping between the pressure taps,
but excluding the pressure loss in the valve tested
2.5
bench pressure loss
∆p
b
pressure loss in the test bench between the pressure taps upstream and downstream of the valve tested
2.6
valve pressure loss
∆p
v
pressure loss in the valve tested
2.7
reference velocity
ν
ref
velocity of flow through the valve calculated from the actual flow rate through the valve divided by the
reference cross-sectional area of the valve
NOTE It is expressed in metres per second (m/s), in accordance with ISO 1000.
2.8
steady-state flow
state of flow where the flow rate through a cross-section does not vary with time
2.9
valve flow coefficient
K
v
number equal to the flow rate of water, in cubic metres per hour, that will flow through a fully open valve with a
one bar pressure loss across the valve
NOTE It is expressed as
1
3
mh
bar
2.10
flow resistance coefficient
ζ
coefficient used in non-dimensional presentation of valve loss
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
2 © ISO 2008 – All rights reserved
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SIST ISO 9644:2015
ISO 9644:2008(E)
3 Test installation
3.1 Permissible deviation of measuring devices
The permissible deviation of the reading indicated on the measuring devices from the actual value shall be as
follows:
Flow rate: ± 2 %
Differential and actual pressure: ± 2 %
Temperature: ± 1 °C
The measuring devices shall be calibrated according to the existing calibration rules in the country concerned.
3.2 Test equipment
3.2.1 Piping
Upstream and downstream piping shall be the same diameter as that of the test valve connection. The lengths
of the straight, uniform-bore pipe shall be as specified in Figures 1 and 2. The inside surface of the piping
shall be free of flaking rust, mill scale and irregularities which might cause excessive turbulence.
In that part of the test apparatus shown within the frame, in Figures 1 and 2, the order of the fittings/devices
shown in the key and the distances between them shall be adhered to, with the exception that the lengths
indicated as 5d and 10d shall be understood to be the minimum allowable length.
3.2.2 Throttling valve
A downstream throttling valve shall be used to control the flow through the test specimen. There are no
restrictions on the size or type of this valve. The throttling valve shall be located downstream of the
downstream pressure tap (used for measuring bench pressure).
3.2.3 Flow measuring device
Any device that can be used to measure flow with acceptable accuracy may be used. If a closed measuring
device (such as a rotameter, Venturi meter or similar device) is used, it shall be located either upstream of the
upstream pressure tap or downstream of the downstream pressure tap.
If an open measuring device (such as a calibrated volumetric tank) is used, it shall be located at the
downstream end of the assembly, i.e. downstream of the downstream throttling valve.
The flow-measuring device shall be installed in accordance with the specific installation instructions and,
where applicable, shall be installed with the required length of straight piping before and after the device.
3.2.4 Pressure differential measuring device
Any device capable of measuring pressure differential with acceptable accuracy may be used.
© ISO 2008 – All rights reserved 3
---------------------- Page: 9 ----------------------
SIST ISO 9644:2015
ISO 9644:2008(E)
3.2.5 Pressure taps
Pressure taps (see Figure 3) shall be provided on piping for measurement of static pressure, and spaced as
shown in Figures 1 or 2. The drilling centreline of the taps shall intersect the centreline of the pipe
perpendicularly, as shown in Figure 3. The taps shall have a diameter, d , of no less than 2 mm and no
1
greater than 9 mm. Th
...
INTERNATIONAL ISO
STANDARD 9644
Second edition
2008-07-01
Agricultural irrigation equipment —
Pressure losses in irrigation valves —
Test method
Matériel agricole d'irrigation — Pertes de pression dans les vannes
d'irrigation — Méthode d'essai
Reference number
ISO 9644:2008(E)
©
ISO 2008
---------------------- Page: 1 ----------------------
ISO 9644:2008(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
COPYRIGHT PROTECTED DOCUMENT
© ISO 2008
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2008 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 9644:2008(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Terms and definitions. 1
3 Test installation. 3
3.1 Permissible deviation of measuring devices. 3
3.2 Test equipment . 3
4 Test procedure . 6
4.1 Test installation. 6
4.2 Test conditions . 6
4.3 Test bench pressure loss . 7
4.4 Test of valve . 8
5 Test results. 8
5.1 Presentation of test results . 8
5.2 Calculated valve coefficients. 8
5.3 Test report . 10
Bibliography . 11
© ISO 2008 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 9644:2008(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 9644 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and
forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems.
This second edition cancels and replaces the first edition (ISO 9644:1993), which has been technically revised.
It also incorporates the Amendment ISO 9644:1993/Amd 1:1998.
iv © ISO 2008 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 9644:2008(E)
Agricultural irrigation equipment — Pressure losses in
irrigation valves — Test method
1 Scope
This International Standard specifies a test method for determining the pressure loss in agricultural irrigation
valves under steady-state conditions when water flows through them. The scope and accuracy of the valve
performance specifications presented will assist agricultural irrigation system designers in comparing pressure
losses through various types of valves.
The measurement of pressure losses provides a means for determining the relationship between pressure
loss and flow rate through the valve.
This International Standard also describes the method of reporting pertinent test data.
No attempt is made to define product use, design or applications.
The test method is suitable for valves with equal inlet and outlet nominal sizes.
NOTE Unless otherwise specified, the equations are expressed in the SI units recommended by ISO 1000.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
2.1
nominal size
DN
conventional numerical designation used to indicate the size of an irrigation valve
NOTE It is expressed in millimetres, or in metres according to ISO 1000.
2.2
volume flow rate
flow rate
q
V
volume of water flowing through the valve per unit time
3 3
NOTE It is expressed in litres per second (l/s), cubic metres per hour (m /h), or in cubic metres per second (m /s)
according to ISO 1000.
© ISO 2008 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 9644:2008(E)
2.3
pressure loss
∆p
difference in pressure due to water flow between two specified points in a system or in part of a system
1)
NOTE It is expressed in pascals (Pa) according to ISO 1000, in kilopascals (kPa) or in bar .
2.4
piping pressure loss
∆p
p
pressure loss in the upstream and downstream portions of the test bench piping between the pressure taps,
but excluding the pressure loss in the valve tested
2.5
bench pressure loss
∆p
b
pressure loss in the test bench between the pressure taps upstream and downstream of the valve tested
2.6
valve pressure loss
∆p
v
pressure loss in the valve tested
2.7
reference velocity
ν
ref
velocity of flow through the valve calculated from the actual flow rate through the valve divided by the
reference cross-sectional area of the valve
NOTE It is expressed in metres per second (m/s), in accordance with ISO 1000.
2.8
steady-state flow
state of flow where the flow rate through a cross-section does not vary with time
2.9
valve flow coefficient
K
v
number equal to the flow rate of water, in cubic metres per hour, that will flow through a fully open valve with a
one bar pressure loss across the valve
NOTE It is expressed as
1
3
mh
bar
2.10
flow resistance coefficient
ζ
coefficient used in non-dimensional presentation of valve loss
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
2 © ISO 2008 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 9644:2008(E)
3 Test installation
3.1 Permissible deviation of measuring devices
The permissible deviation of the reading indicated on the measuring devices from the actual value shall be as
follows:
Flow rate: ± 2 %
Differential and actual pressure: ± 2 %
Temperature: ± 1 °C
The measuring devices shall be calibrated according to the existing calibration rules in the country concerned.
3.2 Test equipment
3.2.1 Piping
Upstream and downstream piping shall be the same diameter as that of the test valve connection. The lengths
of the straight, uniform-bore pipe shall be as specified in Figures 1 and 2. The inside surface of the piping
shall be free of flaking rust, mill scale and irregularities which might cause excessive turbulence.
In that part of the test apparatus shown within the frame, in Figures 1 and 2, the order of the fittings/devices
shown in the key and the distances between them shall be adhered to, with the exception that the lengths
indicated as 5d and 10d shall be understood to be the minimum allowable length.
3.2.2 Throttling valve
A downstream throttling valve shall be used to control the flow through the test specimen. There are no
restrictions on the size or type of this valve. The throttling valve shall be located downstream of the
downstream pressure tap (used for measuring bench pressure).
3.2.3 Flow measuring device
Any device that can be used to measure flow with acceptable accuracy may be used. If a closed measuring
device (such as a rotameter, Venturi meter or similar device) is used, it shall be located either upstream of the
upstream pressure tap or downstream of the downstream pressure tap.
If an open measuring device (such as a calibrated volumetric tank) is used, it shall be located at the
downstream end of the assembly, i.e. downstream of the downstream throttling valve.
The flow-measuring device shall be installed in accordance with the specific installation instructions and,
where applicable, shall be installed with the required length of straight piping before and after the device.
3.2.4 Pressure differential measuring device
Any device capable of measuring pressure differential with acceptable accuracy may be used.
© ISO 2008 – All rights reserved 3
---------------------- Page: 7 ----------------------
ISO 9644:2008(E)
3.2.5 Pressure taps
Pressure taps (see Figure 3) shall be provided on piping for measurement of static pressure, and spaced as
shown in Figures 1 or 2. The drilling centreline of the taps shall intersect the centreline of the pipe
perpendicularly, as shown in Figure 3. The taps shall have a diameter, d , of no less than 2 mm and no
1
greater than 9 mm. The length, l, of the tap bore shall be not less than twice the diameter of the bore. For
thin-walled pipes where the wall thickness is less than 2d , a boss may be added to the pipe wall where the
1
pressure taps are to be located (see Figure 3).
Pressure taps shall be free of burrs and other irregularities and the inside wall of the piping shall be machine-
finished. For pipes of 50 mm diameter and larger, four taps shall be made, situated 90° ± 5° apart on the
...
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