INTERNATIONAL STANDARD
Part 1:Specifications
Partie 1:Specifications
Measurementofwaterflowinclosed conduits-Metersforcoldpotablewater
Mesurage de debit deau dans les conduites fermees Compteurs d'eaupotable froide
Contents
Page
Scope 12 Normative references 13 Definitions 1Technical characteristics 24.1 Meter size and overall dimensions Meter designation and permanent flow-rate24.2 Indicating device 54.3 Verification device 64.4 Adjustment device 74.5 Accelerating device 84.6 Remote output system 84.7 Materials 84.8 Strainer 84.9 Behaviour in case of flowreversal 84.10 Sealing 8Marking 84.11 95 Metrological characteristics5.1 Maximum permissible errors 95.2 Metrological classes 96 Pressure loss 9
Annex
A Bibliography 10
Foreword
ISO（the International Organization for Standardization)is a worldwideof preparing international Standards isnormally carried out through ISotechnical mittees.Each member body interested ina subject forrepresented on that.mittee.Intermationalorganizations.govern- mental and non-governmental in liaison withISO also take part in thework.ISOcollaborates closelywith the InternationalElectrotechnical Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical mittees arecirculated to the member bodies for voting. Publication as an Inter- nationalStandard requires approval by at least 75%of the memberbodies casting a vote.
International StandardISO4064-1was prepared byTechnicalCommitteeISO/TC 30 Measurement of fluid flow in closed conduits Sub-Committee SC 7. Water meters.
Thissecondeditioncancelsandreplacesthefirstedition(ISO 4064-1:1977). of which has been technically revised.
ISO 4064 consists of the following parts under the general titleMeasurement of water flow in closed conduits -Meters for cold potablewater:
-Part 1:Specifications-Part 2:Installation requirements-Part 3:Test methods and equipment
Annex A of this part of ISO 4064 is for information only.
Measurementofwaterflowinclosedconduits-Metersfor coldpotablewater-
Part 1:Specifications
1Scope
gate the possibility ofapplying the mostrecent edi-tions of the standards indicated below.Members of IECand ISOmaintain registers of currently valid In-ternational Standards.
This part of ISO 4064 deals with terminology tech-nical characteristics metrological characteristics and pressure loss.
joints are not made on the threads - Part 1: Desig- ISO228-1:1982 Pipe threads where pressure-tightnation dimensions and tolerances.
It applies to water meters of various metrologicalclasses (see clause 5) which can withstand perma-nent flow-rates from 0 6m/h to 4000 m²/h maxi- mum admissible working pressures (MAP) equal totemperature (MAT) of 30°C. sspe nx e pue q e eo
ISO 7005-2:1988 Metallic flanges-Part 2:Cast ironflanges.
alloy and posite ffanges. ISO 7005-3:1988 Metallic fanges -Part 3:Copper
The remendations of this part of ISO4064 applyintegrating measuring instruments continuously de- towater meters delined as follows:self-containedemploying a direct mechanical process involving the termining the volume of water flowing through them useofvolumetric chambers with mobile walls (volumetric” water meters） or the action of the vel-ocity of the water on therotationrate of a movingpart ("velocity” meters).
IEC 529:1989 Degrees of protection provided by en-closures (iP Code).
3 Definltions
ing definitions apply. For the purposes of this part of ISO 4064 the follow-
ommendations of this part of ISO4064. Legal requirements take precedence over the rec-
3.1“volumetric”meter: Device fited into a closedume and a mechanism driven by the flow，whereby conduit which consists of chambers of known vol-these chambers are successively filled with waterand then emptied.By counting the number of these volumes passing through the device the indicatingdevice totals the volume flow.
2Normativereferences
throughreference in this texlconstitute provislons The following standards contain provisions which.of this part of ISO 4064. At the time of publication the editions indicated were valid.All standards areon this part of ISO 4064 are encouraged to investi-
3.2“veloclty” meter: Device fitted into a closedconduit which consists of a moving element set in
movementof themoving element istransmited by motion directly by the velocity of the water flow.Themechanical or other means to the indicating device which totals the volume flow.
3.2.1Woltmann meter:Device consisting of ahelical blade which rotates about the axis of fiow in the meter.
3.2.2 single-jet and multl-jet meters: Devices con- sistingof a turbinerotorrotating about the axisperpendicular to the flow of water in themeter.Theat a single place on the rotor's periphery.and a multi-jet if the jet impinges simultaneously at sev-eral points around the periphery of the rotor.
passing through the watermeter and the time taken 3.3flow-rate:Quotient of the volume of waterfor this volume to pass through the water meter.
3.4permanent flow-rate q 2:Flow-rate at which themeter isrequired to operate ina satisfactoryman- ner (see 3.6) under normal conditions of use e.gunder steady and/or intermittent flow conditions.
3.5overload flow-rate q :Flow-rate at which thewater meter is required to operate in a satisfactorydeteriorating;its value is wice the value of q manner (see 3.6) for a short period of time without
3.6minimum flow-rate 4mn:Lowestflow-rateat which the meter is required to give indicationswithin the maximum permissible error tolerance.It is determined in relation with the numerical valueof the meter designation.
3.7flow-rate range: Range limited by the overloadlow-rate.q and the minimum flow-rate mwhich the meter indications must not be subject to an error in excess of the maximum permissible er-rors.
and “lower” zones separated by the transitional This range Is divided into two zones called “upper*
curring between overload and minimum flow-rates 3.8 transltlonal flow-rate q2: Flow-rate value Oc-atwhich the fliow-rate range is divided into twothis zone. characterized by a maximum permissible error in
3.9volume flow:Volume of water passing through the water meter disregarding the time taken.
3.10 indicating devlce: Device displaying the vol-ume flow.
3.11 nomlnal pressure (PN): Numerical designationwhich is a rounded number for reference purposes.
All equipment of the same nominal size (DN) anddesignated by the same PN number shall havepatible mating dimensions.
3.12maximumadmissible workingpressure (MAP): For a water meter maximum internal press-ure that it can withstand permanently at a giventemperature.
NOTE1For low temperatures between 0 *C and 30°C the MAP for materials currently used for the bodies of water meters remains constant. For cold water metersPN = MAP.
3.13 nominal size (DN): Numerical designationexcluding those designated by their external diam- mon to all the ponents of a pipe system eter or by the thread dimension. It is a whole num- ber used for reference only approximating theconstructional dimensions.
presence of a water meter in the pipeline at a given 3.14 pressure loss:Pressure loss caused by theflow-rate.
3.15 maximum admissible temperature (MAT): Forawater meter.maximum temperature that it can withstand at a given internal pressure.
3.16 meter designation N:Numerical value pre-ceded by the capital letter N to designate the meterin relation to tabulated values of dimensions.
4Technical characteristics
Meter designation andpermanent flow-rate 4.1Meter size and overall dimensions-
4.1.1 Meter size and overall dimensions
Meter size is characterized either by the thread sizeof the end connections or by the nominal size of theflange.For each meter size there is a corresponding fixed set of overall dimensions (see figure 1）. Thedimensions are given in tables 1 and 2.
For threaded end connections two minimum di- mensions a and b are specified (see 4.1.4).
