ISO 4064-2:2005
(Main)Measurement of water flow in fully charged closed conduits — Meters for cold potable water and hot water — Part 2: Installation requirements
Measurement of water flow in fully charged closed conduits — Meters for cold potable water and hot water — Part 2: Installation requirements
ISO 4064-2:2005 specifies criteria for the selection of single, combination and concentric water meters, associated fittings, installation, special requirements for meters and the first operation of new or repaired meters to ensure accurate constant measurement and reliable reading of the meter. ISO 4064-2:2005 also applies to water meters, based on electrical or electronic principles and to water meters based on mechanical principles incorporating electronic devices, used to meter the actual volume flow of cold potable water. It also applies to electronic ancillary devices. The recommendations of this ISO 4064-2:2005 apply to water meters, irrespective of technology, defined as integrating measuring instruments continuously determining the volume of water flowing through them.
Mesurage de débit d'eau dans les conduites fermées en pleine charge — Compteurs d'eau potable froide et d'eau chaude — Partie 2: Conditions d'installation
Merjenje pretoka vode v popolnoma zaprtih vodih – Merila za hladno pitno vodo in vročo vodo – 2. del: Zahteve za vgradnjo
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INTERNATIONAL ISO
STANDARD 4064-2
Third edition
2005-10-15
Measurement of water flow in fully
charged closed conduits — Meters for
cold potable water and hot water —
Part 2:
Installation requirements
Mesurage de débit d'eau dans les conduites fermées en pleine
charge — Compteurs d'eau potable froide et d'eau chaude —
Partie 2: Conditions d'installation
Reference number
ISO 4064-2:2005(E)
©
ISO 2005
---------------------- Page: 1 ----------------------
ISO 4064-2:2005(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.
© ISO 2005
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 2005 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 4064-2:2005(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Criteria for the selection of water meters. 2
4.1 General considerations. 2
4.2 Information to be provided by the manufacturer . 2
4.3 Meters operating in parallel or in a group. 2
5 Associated fittings. 3
5.1 General. 3
5.2 Upstream of the meter. 3
5.3 Downstream of the meter. 3
6 Installation . 3
6.1 General requirements. 3
6.2 Installation requirements . 4
6.3 Water quality (suspended particles). 5
6.4 Electromagnetic meters . 5
6.5 Meters operating in parallel or in a group. 5
6.6 Security of operation. 5
7 Hydraulic disturbances . 6
7.1 General. 6
7.2 Types of disturbance. 6
7.3 Methods of eliminating disturbances . 6
8 First operation of new or repaired water meters . 7
8.1 General. 7
8.2 Meters operating in parallel or in a group. 7
8.3 Protection of the meter. 7
8.4 Safety of personnel and users . 9
8.5 Comfort of personnel — Access to the water meter and fittings . 10
© ISO 2005 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 4064-2:2005(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 4064-2 was prepared by Technical Committee ISO/TC 30, Measurement of fluid flow in closed conduits,
Subcommittee SC 7, Volume methods including water meters.
This third edition cancels and replaces the second edition (ISO 4064-2:2001), which has been technically
revised, as well as cancelling and replacing ISO 7858-2:2000.
ISO 4064 consists of the following parts, under the general title Measurement of water flow in fully charged
closed conduits — Meters for cold potable water and hot water:
⎯ Part 1: Specifications
⎯ Part 2: Installation requirements
⎯ Part 3: Test methods and equipment
iv © ISO 2005 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 4064-2:2005(E)
Measurement of water flow in fully charged closed conduits —
Meters for cold potable water and hot water —
Part 2:
Installation requirements
1 Scope
This part of ISO 4064 specifies criteria for the selection of single, combination and concentric water meters,
associated fittings, installation, special requirements for meters and the first operation of new or repaired
meters to ensure accurate constant measurement and reliable reading of the meter.
This part of ISO 4064 also applies to water meters, based on electrical or electronic principles and to water
meters based on mechanical principles incorporating electronic devices, used to meter the actual volume flow
of cold potable water. It also applies to electronic ancillary devices.
NOTE 1 As a rule ancillary devices are optional.
The recommendations of this part of ISO 4064 apply to water meters, irrespective of technology, defined as
integrating measuring instruments continuously determining the volume of water flowing through them.
NOTE 2 Attention is drawn to the fact that national legislation may apply in the country of use, which will take
precedence over the provisions of this part of ISO 4064.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 4064-1:2005, Measurement of water flow in closed fully charged conduits — Meters for cold and hot
potable water — Part 1: Specifications
ISO 6817:1992, Measurement of conductive liquid flow in closed conduits — Method using electromagnetic
flowmeters
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4064-1 and the following apply.
3.1
parallel operation
operation of two or more meters grouped together and connected to a common source and a common
delivery
© ISO 2005 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 4064-2:2005(E)
3.2
multiple meter operation
operation of several meters grouped together where their inlets are connected to a common source, or their
outlets to a common delivery, but not both at the same time
4 Criteria for the selection of water meters
4.1 General considerations
The type, metrological characteristics and sizes of water meters shall be determined according to the
operating conditions of the installation and the environmental class(es) demanded, particularly taking into
account the following:
⎯ available supply pressure;
⎯ physical and chemical characteristics of the water;
⎯ acceptable pressure loss across the meter;
⎯ expected flowrates: the flowrates, Q and Q , of the meter (as defined in Clause 3 of ISO 4064-1:2005)
1 3
shall be compatible with the expected flowrate conditions of the installations, including the water flow
direction(s);
⎯ suitability of the meter type for the intended installation conditions;
⎯ available space and pipework to install the meter and fittings;
⎯ possibility of deposition of substances from solution within the meter;
⎯ sustainability of the power supply of the water meter (where applicable).
When using combination meters, care shall be taken to ensure that “cross-over” flowrates are different from
(and less than) normal operating flowrates.
4.2 Information to be provided by the manufacturer
The manufacturer shall supply sufficient information to enable the correct choice and installation of a meter,
such that influencing factors shall not lead to either failure or non-conformance with the specified metrological
characteristics.
NOTE This is particularly important for hydraulic disturbances.
Specifically, the manufacturer shall determine the influence factors, which affect the indicating error and state
of the individual meter design. For each influence factor, the manufacturer shall state the relevant rated
operating conditions applicable to the meter.
4.3 Meters operating in parallel or in a group
4.3.1 For meters operating in parallel, means shall be provided so that the unserviceability of one or more
meters within a group shall not cause the remaining meters to operate at a flowrate in excess of each
individual meter’s limit of operation.
4.3.2 In order to ensure that water meters of different types will operate satisfactorily in parallel, the
individual characteristics of meters operating in parallel shall be compatible, e.g. by grouping them according
to pressure loss, flowrate range and maximum working pressure. However, the installation conditions for each
type shall be respected.
2 © ISO 2005 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 4064-2:2005(E)
4.3.3 For meters operating in parallel and multiple meter operation, the possibilities of interaction between
one meter or meter type and another to the detriment of their life and accuracy, e.g. pressure surges and
vibration, shall be considered.
NOTE Examples of the use of meters operating in parallel and multiple meter operation are the following:
⎯ meters operating in parallel where the installation of one large meter to meet the maximum water demand or to cover
the required flowrate range is impractical;
⎯ meters installed in parallel where “stand by” meters are necessary to ensure continuity of delivery and flow
measurement in the case of filter blockage or water meter breakdown;
⎯ meters grouped in multiple operation for ease of access, service and reading, where it is necessary to split a water
supply into a number of branches, as for instance in a block of flats, or where it is necessary to unite a number of
metered tributary flows into a common main, as in a water treatment plant.
5 Associated fittings
5.1 General
The water meter installation may include the following accessories as applicable.
5.2 Upstream of the meter
5.2.1 A stopcock or valve, optionally with the direction of the valve operation indicated.
5.2.2 A flow straightening device and/or a length of straight pipe, fitted between the valve and the
meter.
5.2.3 A strainer, fitted between the stop valve and the meter.
5.2.4 A means of sealing the connection of the water meter to the water supply line, in order to detect
any unauthorized removal of the water meter.
5.3 Downstream of the meter
5.3.1 An adjustable length device, to allow for easy installation and removal of the water meter. This
3
device is specially recommended for meters having Q W 16 m /h.
3
5.3.2 A device including a drain valve, which may be used for pressure monitoring, sterilization and water
sampling.
3
5.3.3 A stopcock or a valve, for meters having Q > 4,0 m /h; this valve shall be operated in the same
3
sense as the upstream valve.
5.3.4 A check valve, if required, except for bi-directional flow applications.
6 Installation
6.1 General requirements
6.1.1 Every water meter, single or in a group, shall be easily accessible for reading (without, e.g., the use of
mirror or ladder), for installation, for maintenance, for removal and for in situ dismantling of the mechanism if
required.
© ISO 2005 – All rights reserved 3
---------------------- Page: 7 ----------------------
ISO 4064-2:2005(E)
In addition, for water meters of mass in excess of 25 kg, clear access to the installation site to allow the water
meter to be brought to, or removed from, its working position, and adequate space around the working
position for the installation of lifting gear, shall be provided. The following points shall be taken into account:
⎯ need for adequate illumination of the installation site;
⎯ need for the floor to be even, rigid, non-slip and clear of obstacles.
6.1.2 Accessories such as those specified in 5.2 and 5.3, if fitted, shall also be readily accessible and the
requirements of 6.1.1, relating to large meters shall also be applicable to the fittings.
6.1.3 In all cases, contamination shall be avoided, especially when the meter is installed in a pit, by
mounting the water meter and the fittings at a sufficient height above the floor. If necessary, the pit shall be
provided with a sump or drain for water removal.
6.2 Installation requirements
6.2.1 For correct operation and long service, a water meter shall always be entirely full of water.
6.2.2 The meter shall be protected from the risk of damage by shock or vibration induced by the
surroundings.
6.2.3 The meter shall not be subjected to undue stresses caused by pipes and fittings. If necessary, it shall
be mounted on a plinth or bracket.
The water pipe lines upstream and downstream shall be adequately anchored to ensure that no part of the
installation can be displaced under water thrust when the meter is dismantled or disconnected on one side.
6.2.4 The meter shall be p
...
SLOVENSKI STANDARD
SIST ISO 4064-2:2006
01-september-2006
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YURþRYRGR±GHO =DKWHYH]DYJUDGQMR
Measurement of water flow in fully charged closed conduits -- Meters for cold potable
water and hot water -- Part 2: Installation requirements
Mesurage de débit d'eau dans les conduites fermées en pleine charge -- Compteurs
d'eau potable froide et d'eau chaude -- Partie 2: Conditions d'installation
Ta slovenski standard je istoveten z: ISO 4064-2:2005
ICS:
91.140.60 Sistemi za oskrbo z vodo Water supply systems
SIST ISO 4064-2:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST ISO 4064-2:2006
---------------------- Page: 2 ----------------------
SIST ISO 4064-2:2006
INTERNATIONAL ISO
STANDARD 4064-2
Third edition
2005-10-15
Measurement of water flow in fully
charged closed conduits — Meters for
cold potable water and hot water —
Part 2:
Installation requirements
Mesurage de débit d'eau dans les conduites fermées en pleine
charge — Compteurs d'eau potable froide et d'eau chaude —
Partie 2: Conditions d'installation
Reference number
ISO 4064-2:2005(E)
©
ISO 2005
---------------------- Page: 3 ----------------------
SIST ISO 4064-2:2006
ISO 4064-2:2005(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.
© ISO 2005
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 2005 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 4064-2:2006
ISO 4064-2:2005(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Criteria for the selection of water meters. 2
4.1 General considerations. 2
4.2 Information to be provided by the manufacturer . 2
4.3 Meters operating in parallel or in a group. 2
5 Associated fittings. 3
5.1 General. 3
5.2 Upstream of the meter. 3
5.3 Downstream of the meter. 3
6 Installation . 3
6.1 General requirements. 3
6.2 Installation requirements . 4
6.3 Water quality (suspended particles). 5
6.4 Electromagnetic meters . 5
6.5 Meters operating in parallel or in a group. 5
6.6 Security of operation. 5
7 Hydraulic disturbances . 6
7.1 General. 6
7.2 Types of disturbance. 6
7.3 Methods of eliminating disturbances . 6
8 First operation of new or repaired water meters . 7
8.1 General. 7
8.2 Meters operating in parallel or in a group. 7
8.3 Protection of the meter. 7
8.4 Safety of personnel and users . 9
8.5 Comfort of personnel — Access to the water meter and fittings . 10
© ISO 2005 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 4064-2:2006
ISO 4064-2:2005(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 4064-2 was prepared by Technical Committee ISO/TC 30, Measurement of fluid flow in closed conduits,
Subcommittee SC 7, Volume methods including water meters.
This third edition cancels and replaces the second edition (ISO 4064-2:2001), which has been technically
revised, as well as cancelling and replacing ISO 7858-2:2000.
ISO 4064 consists of the following parts, under the general title Measurement of water flow in fully charged
closed conduits — Meters for cold potable water and hot water:
⎯ Part 1: Specifications
⎯ Part 2: Installation requirements
⎯ Part 3: Test methods and equipment
iv © ISO 2005 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 4064-2:2006
INTERNATIONAL STANDARD ISO 4064-2:2005(E)
Measurement of water flow in fully charged closed conduits —
Meters for cold potable water and hot water —
Part 2:
Installation requirements
1 Scope
This part of ISO 4064 specifies criteria for the selection of single, combination and concentric water meters,
associated fittings, installation, special requirements for meters and the first operation of new or repaired
meters to ensure accurate constant measurement and reliable reading of the meter.
This part of ISO 4064 also applies to water meters, based on electrical or electronic principles and to water
meters based on mechanical principles incorporating electronic devices, used to meter the actual volume flow
of cold potable water. It also applies to electronic ancillary devices.
NOTE 1 As a rule ancillary devices are optional.
The recommendations of this part of ISO 4064 apply to water meters, irrespective of technology, defined as
integrating measuring instruments continuously determining the volume of water flowing through them.
NOTE 2 Attention is drawn to the fact that national legislation may apply in the country of use, which will take
precedence over the provisions of this part of ISO 4064.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 4064-1:2005, Measurement of water flow in closed fully charged conduits — Meters for cold and hot
potable water — Part 1: Specifications
ISO 6817:1992, Measurement of conductive liquid flow in closed conduits — Method using electromagnetic
flowmeters
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4064-1 and the following apply.
3.1
parallel operation
operation of two or more meters grouped together and connected to a common source and a common
delivery
© ISO 2005 – All rights reserved 1
---------------------- Page: 7 ----------------------
SIST ISO 4064-2:2006
ISO 4064-2:2005(E)
3.2
multiple meter operation
operation of several meters grouped together where their inlets are connected to a common source, or their
outlets to a common delivery, but not both at the same time
4 Criteria for the selection of water meters
4.1 General considerations
The type, metrological characteristics and sizes of water meters shall be determined according to the
operating conditions of the installation and the environmental class(es) demanded, particularly taking into
account the following:
⎯ available supply pressure;
⎯ physical and chemical characteristics of the water;
⎯ acceptable pressure loss across the meter;
⎯ expected flowrates: the flowrates, Q and Q , of the meter (as defined in Clause 3 of ISO 4064-1:2005)
1 3
shall be compatible with the expected flowrate conditions of the installations, including the water flow
direction(s);
⎯ suitability of the meter type for the intended installation conditions;
⎯ available space and pipework to install the meter and fittings;
⎯ possibility of deposition of substances from solution within the meter;
⎯ sustainability of the power supply of the water meter (where applicable).
When using combination meters, care shall be taken to ensure that “cross-over” flowrates are different from
(and less than) normal operating flowrates.
4.2 Information to be provided by the manufacturer
The manufacturer shall supply sufficient information to enable the correct choice and installation of a meter,
such that influencing factors shall not lead to either failure or non-conformance with the specified metrological
characteristics.
NOTE This is particularly important for hydraulic disturbances.
Specifically, the manufacturer shall determine the influence factors, which affect the indicating error and state
of the individual meter design. For each influence factor, the manufacturer shall state the relevant rated
operating conditions applicable to the meter.
4.3 Meters operating in parallel or in a group
4.3.1 For meters operating in parallel, means shall be provided so that the unserviceability of one or more
meters within a group shall not cause the remaining meters to operate at a flowrate in excess of each
individual meter’s limit of operation.
4.3.2 In order to ensure that water meters of different types will operate satisfactorily in parallel, the
individual characteristics of meters operating in parallel shall be compatible, e.g. by grouping them according
to pressure loss, flowrate range and maximum working pressure. However, the installation conditions for each
type shall be respected.
2 © ISO 2005 – All rights reserved
---------------------- Page: 8 ----------------------
SIST ISO 4064-2:2006
ISO 4064-2:2005(E)
4.3.3 For meters operating in parallel and multiple meter operation, the possibilities of interaction between
one meter or meter type and another to the detriment of their life and accuracy, e.g. pressure surges and
vibration, shall be considered.
NOTE Examples of the use of meters operating in parallel and multiple meter operation are the following:
⎯ meters operating in parallel where the installation of one large meter to meet the maximum water demand or to cover
the required flowrate range is impractical;
⎯ meters installed in parallel where “stand by” meters are necessary to ensure continuity of delivery and flow
measurement in the case of filter blockage or water meter breakdown;
⎯ meters grouped in multiple operation for ease of access, service and reading, where it is necessary to split a water
supply into a number of branches, as for instance in a block of flats, or where it is necessary to unite a number of
metered tributary flows into a common main, as in a water treatment plant.
5 Associated fittings
5.1 General
The water meter installation may include the following accessories as applicable.
5.2 Upstream of the meter
5.2.1 A stopcock or valve, optionally with the direction of the valve operation indicated.
5.2.2 A flow straightening device and/or a length of straight pipe, fitted between the valve and the
meter.
5.2.3 A strainer, fitted between the stop valve and the meter.
5.2.4 A means of sealing the connection of the water meter to the water supply line, in order to detect
any unauthorized removal of the water meter.
5.3 Downstream of the meter
5.3.1 An adjustable length device, to allow for easy installation and removal of the water meter. This
3
device is specially recommended for meters having Q W 16 m /h.
3
5.3.2 A device including a drain valve, which may be used for pressure monitoring, sterilization and water
sampling.
3
5.3.3 A stopcock or a valve, for meters having Q > 4,0 m /h; this valve shall be operated in the same
3
sense as the upstream valve.
5.3.4 A check valve, if required, except for bi-directional flow applications.
6 Installation
6.1 General requirements
6.1.1 Every water meter, single or in a group, shall be easily accessible for reading (without, e.g., the use of
mirror or ladder), for installation, for maintenance, for removal and for in situ dismantling of the mechanism if
required.
© ISO 2005 – All rights reserved 3
---------------------- Page: 9 ----------------------
SIST ISO 4064-2:2006
ISO 4064-2:2005(E)
In addition, for water meters of mass in excess of 25 kg, clear access to the installation site to allow the water
meter to be brought to, or removed from, its working position, and adequate space around the working
position for the installation of lifting gear, shall be provided. The following points shall be taken into account:
⎯ need for adequate illumination of the installation site;
⎯ need for the floor to be even, rigid, non-slip and clear of obstacles.
6.1.2 Accessories such as those specified in 5.2 and 5.3, if fitted, shall also be readily accessible and the
requirements of 6.1.1, relating to large meters shall also be applicable to the fittings.
6.1.3 In all cases, contamination shall be avoided, especially when the meter is installed in a pit, by
mounting the water meter and the fittings at a sufficient height above the floor. If necessary, the pit shall be
provided with a sump or drain for water removal.
6.2 Installation requirements
6.2.1 For correct operation and long service, a water meter shall
...
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