SIST EN 14812:2006+A1:2007
(Main)Water conditioning equipment inside buildings - Chemical dosing systems - Pre-set dosing systems - Requirements for performance, safety and testing
Water conditioning equipment inside buildings - Chemical dosing systems - Pre-set dosing systems - Requirements for performance, safety and testing
This European Standard specifies definitions, principles of construction (but not dimensions) and design, requirements on performance and operation as well as methods for testing the performance of chemical preset dosing systems for conditioning water intended for human consumption inside buildings (see [8]) which are permanently connected to the mains supply.
Anlagen zur Behandlung von Trinkwasser innerhalb von Gebäuden - Dosiersysteme - Nicht einstellbare Dosiersysteme - Anforderungen an Ausführung, Sicherheit und Prüfung
Diese Europäische Norm legt Begriffe, Grundsätze zur Konstruktion (jedoch keine Maße) und Gestaltung, Anforderungen an die Funktion und den Betrieb sowie Verfahren zur Prüfung der Leistungsanforderungen von Dosiersystemen innerhalb von Gebäuden (siehe [8]) zur Behandlung von Wasser, das für den menschlichen Gebrauch bestimmt ist, fest, die fest am Eintrittspunkt des Wassers in die Hausinstallation angeschlossen sind.
Appareils de traitement d'eau a l'intérieur des bâtiments - Systemes de dosage de réactifs chimiques - Systemes de dosage non ajustables - Exigences de performance, de sécurité et essais
La présente Norme européenne spécifie les définitions, les principes de conception et de construction (mais pas les dimensions), les exigences relatives aux performances et au fonctionnement ainsi que les méthodes d’essai applicables aux systèmes de dosage de réactifs chimiques utilisés pour le traitement de l’eau destinée à la consommation humaine à l’intérieur des bâtiments (voir ![8]"), et qui sont reliés en permanence au réseau.
Oprema, ki se uporablja za pripravo pitne vode v stavbah - Naprave za doziranje kemikalij – Prednastavljivi dozirni sistemi – Zahteve za delovanje, varnost in preskušanje
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Water conditioning equipment inside buildings - Chemical dosing systems - Pre-set dosing systems - Requirements for performance, safety and testingOprema, ki se uporablja za pripravo pitne vode v stavbah - Naprave za doziranje kemikalij – Prednastavljivi dozirni sistemi – Zahteve za delovanje, varnost in preskušanjeAppareils de traitement d'eau a l'intérieur des bâtiments - Systemes de dosage de réactifs chimiques - Systemes de dosage non ajustables - Exigences de performance, de sécurité et essaisAnlagen zur Behandlung von Trinkwasser innerhalb von Gebäuden - Dosiersysteme - Nicht einstellbare Dosiersysteme - Anforderungen an Ausführung, Sicherheit und PrüfungTa slovenski standard je istoveten z:EN 14812:2005+A1:2007SIST EN 14812:2006+A1:2007en,fr,de91.140.60Sistemi za oskrbo z vodoWater supply systems13.060.20Pitna vodaDrinking waterICS:SLOVENSKI
STANDARDSIST EN 14812:2006+A1:200701-september-2007
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14812:2005+A1
June 2007 ICS 13.060.20; 91.140.60 SupersedesEN 14812:2005English Version
Water conditioning equipment inside buildings -Chemical dosing systems - Pre-set dosing systems - Requirements for performance, safety and testing
Appareils de traitement d'eau à l'intérieur des bâtiments - Systèmes de dosage de réactifs chimiques - Systèmes de dosage non ajustables - Exigences de performance, de sécurité et essais
Anlagen zur Behandlung von Trinkwasser innerhalb von Gebäuden - Dosiersysteme - Nicht einstellbare Dosiersysteme - Anforderungen an Ausführung, Sicherheit und Prüfung This European Standard was approved by CEN on 26 August 2005 and includes Amendment 1 approved by CEN on 10 May 2007.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
B-1050 Brussels © 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14812:2005+A1:2007: E
EN 14812:2005+A1:2007 (E) 2 Contents Page Foreword.4 1 Scope.5 2 Normative references.5 3 Terms and definitions.6 4 Design requirements.6 4.1 Materials of construction.6 4.2 Connections.7 4.3 Venting.7 4.4 Radio interference and electrical safety.7 4.5 Dosing agent containers.7 4.6 Accessibility.7 4.7 Nominal size.7 5 Performance requirements.8 5.1 Dosing and dosing agents.8 5.1.1 Dosing agents.8 5.1.2 Dosing.8 5.2 Working ranges.8 5.3 Protection against backflow of proprietary chemical.9 5.4 Working temperature range.9 5.5 Pressure conditions.9 5.5.1 Nominal pressure and working pressure range.9 5.5.2 Effects of pressure variations.9 5.5.3 Pressure drop.9 5.5.4 Water hammer.9 6 Testing.9 6.1 General.9 6.2 Dosing and dosing agents.10 6.2.1 Test rig.10 6.2.2 Analysis.11 6.2.3 Quality of test water.11 6.2.4 Sampling.11 6.2.5 Evaluation of results.11 6.2.6 Dosing agents.11 6.2.7 Dosing.11 6.3 Working ranges.12 6.4 Protection against backflow of dosing agent.12 6.4.1 Procedure.12 6.4.2 Evaluation of results.12 6.5 Pressure conditions.12 6.5.1 Nominal pressure and working pressure range.12 6.5.2 Static pressure.13 6.5.3 Dynamic pressure.13 6.5.4 Working pressure range.13 6.5.5 Pressure drop.13 7 Labelling.13 7.1 Nameplate on dosing apparatus.13 7.2 Information to be given on dosing agent container.14 8 Manufacturer's product information.14
EN 14812:2005+A1:2007 (E) 3 Annex A (informative)
Examples of connections.15 Annex B (normative)
!Installation, operation and maintenance.16 Bibliography.20
EN 14812:2005+A1:2007 (E) 4 Foreword This document (EN 14812:2005+A1:2007) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. This document shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2007 and conflicting national standards shall be withdrawn at the latest by December 2007. This document includes Amendment 1, approved by CEN on 2007-05-10. This document supersedes EN 14812:2005. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". In respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this European Standard: 1) This European Standard provides no information as to whether the product may be used without restriction in any of the Member States in EU or EFTA. 2) It should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EN 14812:2005+A1:2007 (E) 5 1 Scope This European Standard specifies definitions, principles of construction (but not dimensions) and design, requirements on performance and operation as well as methods for testing the performance of chemical pre-set dosing systems for conditioning water intended for human consumption inside buildings (see [8]) which are permanently connected to the mains supply. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies: For undated references, the latest edition of the referenced document (including any amendments) applies. EN 806-2, Specification for installations inside buildings conveying water for human consumption - Part 2: Design EN 1267, Valves – Test of flow resistance using water as test fluid EN 55011, Industrial, scientific and medical (ISM) radio-frequency equipment - Radio disturbance characteristics - Limits and
methods of measurement (CISPR 11:1997, modified EN 60204-1, Safety of machinery – Electrical equipment of machines – Part 1: General requirements (IEC 60204-1:1997) EN 60335-11, Household and similar electrical appliances – Safety – Part 1: General requirements (IEC 60335-1:2001, modified)
EN 60335-2-41, Household and similar electrical appliances - Safety - Part 2-41: Particular requirements for pumps (IEC
60335-2-41:2002) EN 60730-2-8:2002, Automatic electrical controls for household and similar use — Part 2-8: Particular requirements for electrically operated water valves, including mechanical requirements (IEC 60730-2- 8:2000, modified) EN ISO 10304-1, Water quality – Determination of dissolved fluoride, chloride, nitrite, orthophosphate, bromide, nitrate and sulphate ions, using liquid chromatography of ions – Part 1: Method for water with low contamination (ISO 10304-1:1992) EN ISO 10304-2, Water quality – Determination of dissolved anions by liquid chromatography of ions – Part 2: Determination of bromide, chloride, nitrate, nitrite, orthophosphate and sulfate in waste water (ISO 10304-2:1995) EN ISO 10304-3, Water quality – Determination of dissolved anions by liquid chromatography of ions – Part 3: Determination of chromate, iodide, sulphite, thiocyanate and thiosulfate (ISO 10304-3:1997) EN ISO 10304-4, Water quality – Determination of dissolved anions by liquid chromatography of ions – Part 4: Determination of chlorate, chloride and chlorite in water with low contamination (ISO 10304-4:1997) EN ISO 11885, Water quality – Determination of 33 elements by inductively coupled plasma atomic emission spectroscopy (ISO 11885:1996) EN ISO 12100-1, Safety of machinery – Basic concepts, general principles for design – Part 1: Basic terminology, methodology (ISO 12100-1:2003)
1 Observe transition period for EN 60335-1(1994) ending 2008-07-01.
EN 14812:2005+A1:2007 (E) 6 EN ISO 12100-2, Safety of machinery – Basic concepts, general principles for design – Part 2: Technical principles (ISO 12100-2:2003) 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 conditioning of water intended for human consumption processes that modify the quality of water intended for human consumption within the Drinking Water Directive or national drinking water regulations with regard to specific individual constituents as defined in EN 806-2 3.2 pre-set dosing system device used for the controlled addition of dosing agents in one or more fixed quantities 3.3 working range range of treated water flow rates between which the dosing system provides the required accuracy of concentration of the dosing agent within limits of concentration and pressure drop prescribed by the manufacturer. It covers the range between the upper and lower working limits 3.4 dosing volume per recharge water volume that can be treated with one recharge of dosing agent 3.5 proprietary chemical specific composition of one or more dosing agents in a particular physical form that is put on the market by the manufacturer under his trade name and supplied together with the dosing apparatus 3.6 dosing agents active chemical substances for conditioning water intended for human consumption 3.7 manufacturer company (manufacturer or supplier) under whose name the dosing system and the proprietary chemical(s) are put on the market 4 Design requirements 4.1 Materials of construction Until EAS comes into force, the current national regulations remain applicable. NOTE Products intended for use in water supply systems should comply, when existing, with national regulations and testing arrangements that ensure fitness for contact with drinking water. The Member states relevant regulators and the EC Commission agreed on the principles of a future unique European Acceptance Scheme (EAS), which would provide a common testing and approval arrangement at European level. If and when the EAS is adopted, European Product Standards will be amended by the addition of an Annex Z/EAS under Mandate M/136 which will contain formal references to the testing, certification and product marking requirements of the EAS.
EN 14812:2005+A1:2007 (E) 7 4.2 Connections Examples of connections are shown in Annex A. 4.3 Venting The dosing apparatus shall be designed so that accumulation of air or other gases during operation is avoided or does not impair the dosing accuracy. Compliance with this requirement shall be checked on the basis of the detailed technical design documents supplied with the apparatus. 4.4 Radio interference and electrical safety It is the responsibility of the manufacturer that the dosing system conforms to EN ISO 12100-1,
EN ISO 12100-2, EN 60204-1, EN 60335-1 and EN 60335-2-41, following the provisions of Directive 89/336/EEC and Directive 73/23/EEC (see ![9], [10]"). 4.5 Dosing agent containers Materials selected for the manufacture of dosing agent containers shall protect the contents against harmful effects of light. The design of the connection between the dosing agent container and the dosing apparatus shall exclude any accidental contamination of the contents during either normal operation or change of the container. NOTE The size of the dosing agent container – or the recharge volume, if a solid type of dosing agent is used – should be calculated so that a replacement becomes necessary after not more than six months. 4.6 Accessibility All parts which have to be actuated for replacing of the dosing agent container and for operation and control shall be easily accessible. It shall be possible to protect them against unauthorised actuation, for example by means of special tools, seals or locks. Renewal of the dosing material shall be carried out only by replacing by a ready-made container filled with proprietary chemical. Replacement of the dosing agent container shall be possible without having to disconnect the dosing apparatus from the connecting pipework. 4.7 Nominal size The nominal size of system connection shall correspond to the flow rates given in Table 1. The inlet connection size of the dosing device may be one size larger or smaller than the nominal size. For flange connections, the inlet flange shall conform to nominal size. Table 1 — Flow rate values at upper limit of working range Nominal size DN 15 20 25 32 40 50 65 80 100 Upper limit of working range flow rate QN 0,35 0,63 1,0 1,6 2,53 3,89 6,67 10 15,56 l/s
Upper limit of working range flow rate QN
1,27 2,27 3,6 5,8 9,1 14 24 36 56 m3/h
NOTE
These flow rates correspond to a velocity of approximately 2 m/s.
EN 14812:2005+A1:2007 (E) 8 5 Performance requirements 5.1 Dosing and dosing agents 5.1.1 Dosing agents The purpose of the dosing agents shall be restricted to one or more of the following water treatment targets: disinfection of the water; inhibition of corrosion phenomena; inhibition of scaling phenomena (by stabilisation of hardness). Dosing systems may be designed for dosing with one or more proprietary chemicals. The manufacturer shall define the proprietary chemicals and their water treatment target depending on the composition of the water and the installation components to be protected. Each proprietary chemical shall be tested separately. Proprietary chemicals shall meet the quality requirements of the relevant European Standard for chemicals used for conditioning of water intended for human consumption. 5.1.2 Dosing The choice of the dosing method shall be at the manufacturer's discretion. NOTE For devices dosing proprietary chemicals supplied in liquid form, the dosing characteristics can be tested with a test solution. The dosed quantity of each proprietary chemical and the dosing agents concentrations in the treated water can then be calculated, provided that viscosity as well as density does not differ from those of the test solution and release of gas does not occur. The concentration of dosing agent in the conditioned water shall neither be lower than 20 % nor higher than 100 % of the maximum concentration defined by the manufacturer for each single type of proprietary chemical. No individual value shall be lower than 16 % or higher than 120 % of this maximum concentration. Measures shall be taken to ensure that the above defined concentration in the conditioned water is not exceeded even after periods of downtime, pressure fluctuation or after failure of the electric power supply. During continuous operation as specified in 6.2.7.1 and during intermittent operation as specified in 6.2.7.2, the dosing apparatus shall meet the above mentioned requirements at the lower and upper working limits of the working range as well as at 50 % and 120 % of the upper working limit. These requirements shall apply to each pre-set dosing rate that can be selected on site. 5.2 Working ranges The lower working limit of the working range shall not exceed the values given in Table 2. Table 2 — Working ranges Working limit Working ranges m³/h Upper limit of working range ≤ 10 > 10 ≤ 20 > 20 Maximum lower limit of working range 0,06 0,15 0,25
EN 14812:2005+A1:2007 (E) 9 5.3 Protection against backflow of proprietary chemical Dosing systems shall be designed so that overdosing due to suction of the proprietary chemical into the drinking water supply cannot occur under any operation condition without external backflow protection. 5.4 Working temperature range The manufacturer shall specify the minimum and maximum working temperatures between which the dosing apparatus including accessories and fittings will operate correctly. The maximum temperature shall be at least 30 °C for the water and the ambient air. NOTE Usually the working temperature range is not to be verified. If there is any concern, the dosing according to 6.2.7.1 should be performed additionally with the test solution at the specified maximum temperature. 5.5 Pressure conditions 5.5.1 Nominal pressure and working pressure range The manufacturer shall specify the minimum and maximum working pressures between which the dosing apparatus including accessories and fittings will operate correctly at the maximum permissible water and room temperatures. The maximum working pressure for normal operating conditions indicated by the manufacturer shall be at least 0,6 MPa at the maximum water and room temperatures. The nominal pressure shall be at least 1 MPa. Testing shall be carried out in accordance with 6.5.1 to 6.5.4. 5.5.2 Effects of pressure variations Pressure variations of ± 0,2 MPa shall not impair the function and the accuracy of dosing apparatus. 5.5.3 Pressure drop When tested in accordance with 6.5.5, the pressure drop shall not exceed 0,08 MPa over the entire working range. 5.5.4 Water hammer When tested in accordance with EN 60730-2-8:2002, Annex EE, the dosing systems shall not cause water hammer which endangers the safety of the installation. 6 Testing 6.1 General Unless otherwise specified any tolerances shall be ± 5 %. Unless otherwise stated, tests shall be carried out at ambient temperature between 15°C and 25°C with water of between 10 °C and 30 °C.
EN 14812:2005+A1:2007 (E) 10 6.2 Dosing and dosing agents 6.2.1 Test rig A test rig shall be used as shown in Figure 1. Dimensions in millimetres
Key 1 Dosing device to be tested 9 Pressure gauge 18 Continuous measurement of dosing agent concentration 2 Threaded joints 10 Flowmeter 19 Electrode cable 3 Sensors for testing the pressure drop 11 Regulating valve 20 Measuring amplifier 4 U piece for static mixing 12 Ball valve 21 Recording device 5 Differential pressure gauge 13 Water meter
6 Open storage container, volume 6 l
14, 15 Valves for backflow testing
7 Vacuum container, volume 20 l 16 Vacuum pump
8 Pressure boosting pump 17 Sampling pipe
Figure 1 — Test rig
EN 14812:2005+A1:2007 (E) 11 6.2.2 Analysis The dosing characteristic of the dosing apparatus to be tested shall be determined using a continuously measurement and recording equipment (see Figure 1, items 18, 20 and 21), e.g. electrode determining the sodium concentration difference between the feed water and the treated water for the test solution according to a difference-sodium (sodium + potassium) determination. For the analytical data to be determined discontinuously, use the water analysis method as specified in EN ISO 11885, EN ISO 10304-1 to EN ISO 10304-4. 6.2.3 Quality of test water The composition of the test water shall be within the field of application specified by the manufacturer for the dosing apparatus concerned and the associated dosing agent. 6.2.4 Sampling Samples for continuous measurement shall be taken at the points of collection (see Figure 1, item 18) in accordance with requirements specified for the method of measurement applied. Samples for discontinuous measurement shall be taken at the ball valve (see Figure 1, item 12) and fed into the collection vessels via a hose. For discontinuous measurement, the volume of the individual samples, in litres, shall correspond to the upper working limit in cubic meters per hour. In the case of dosing apparatus with an upper working limit greater than 10 m³/h, the volume of the individual sample shall be 10 l. 6.2.5 Evaluation of results If the recorded concentrations of the dosing agent suggest that the dosing system will not function within its given working range, i.e. exceeding the limits, then the test shall be repeated with samples being taken discontinuously measurement at the time intervals recorded on the chart at upper or lower concentration. 6.2.6 Dosing agents Check the compliance of the dosing agent with the requirements of 5.1.1. To test the dosing volume per charge and to determine the dosing characteristic when other dosing agents are used, analyse the chemicals for their dosing agent concentrations. 6.2.7 Dosing 6.2.7.1 Continuous operation The first test shall be carried out at the lower limit of working range. Starting from zero, increase the water flow rate slowly so that the continuous measurement of the chemical concentration permits the detection of possible overdosing as well as the lower limit of working range specific to the apparatus. Then adjust the flow rate in the following sequence: specified upper working limit - specified lower working limit – 120 % and 50 % of the upper working limit. Within 5 min of adjustment to the relevant flow rate, take a sample as specified in 6.2.4 for analysis. After sampling, maintain the continuous measurement in each case at the adjusted flow rate for a further 5 min. 6.2.7.2 Intermittent operation Operate the dosing apparatus for 10 min at 10 % of its specified upper working limit which is adjusted by regulating valve (see Figure 1, item 11) with the ball valve (see Figure 1, item 12) fully open. Operate the ball valve to decrease the pressure from 0,4 MPa to 0,2 MPa and hold for 5 min and then raise it again. Repeat this twice. Then raise the pressure from 0,4 MPa to 0,6 MPa and hold for 5 min and then drop it to 0,4 MPa again. Repeat this once. Follow this by a shut-off period. After the shut-off period as specified in Table 3 start the operation of the dosing apparatus by completely opening the ball valve.
EN 14812:2005+A1:2007 (E) 12 Without interruption take five samples from the stream of water having volumes as specified in 6.2.4. Continue measurement for further 30 min under the same operating conditions. Evaluate the results as specified in 6.2.5. Table 3 — Shut-off periods Upper working limit m³/h Shutoff period h ≤ 3 8 > 3 to ≤ 5 6 > 5 4
6.2.7.3 Overdosing in case of electrical power failure By reference to the manufacturer's technical documentation, check whether a mains failure can result in overdosing. In case of doubt, disconnect the power supply and repeat 6.2.7.2. 6.2.7.4 Maximum concentrations Check whether the concentrations in the treated water meet the requirements of 5.1.2. 6.3 Working ranges Check whether the requirement of 5.2 is fulfilled. 6.4 Protection against backflow of dosing agent 6.4.1 Procedure Fill the open storage container (see Figure 1, item 6) with 6 l of water through a separate pipe and then close all the valves. After a shut-off period as specified in Table 3, generate an absolute pressure of 0,02 MPa in the vacuum container (see Figure 1, item 7) and open the valve (see Figure 1, item 14) above the vacuum container. After a further 10 min, open the valve (see Figure 1, item 15) below the open storage container and the valves on the flow rate measuring instruments (see Figure 1, item 10). 6.4.2 Evaluation of results
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