Influence of organic materials on water intended for human consumption - Determination of the chlorine demand - Test method
This standard specifies a method for determining the chlorine demand of organic materials intended for use in contact with drinking water.
The standard is applicable to factory made and site applied products used for the distribution, transport and storage of drinking water.
The standard does not cover the use of high levels of chlorine to disinfect products when they are put into service.
Einfluss organischer Materialien auf Wasser für den menschlichen Gebrauch - Bestimmung der Chlorzehrung - Prüfverfahren
Diese Norm legt ein Verfahren zur Bestimmung der Chlorzehrung von Bedarfsgegenständen aus organischen Materialien fest, die für den Gebrauch im Kontakt mit Trinkwasser vorgesehen sind.
Diese Norm ist anwendbar auf fabrikmäßig und auf vor Ort hergestellte Produkte, die zur Verteilung, zum Transport und zur Speicherung von Trinkwasser dienen.
Diese Norm behandelt nicht den Einsatz hoher Chlorkonzentrationen für die Desinfektion von Produkten vor ihrem Einsatz.
Influence des matériaux organiques sur l'eau destinée à la consommation humaine - Détermination de la demande en chlore - Méthode d'essai
La présente Norme spécifie une méthode de détermination de la demande en chlore des matériaux organiques destinés à entrer en contact avec l’eau potable.
Cette Norme s’applique aux produits fabriqués en usine et aux produits appliqués sur site, utilisés pour la distribution, le transport et le stockage de l’eau potable.
La présente Norme ne traite pas de l’utilisation de chlore à des niveaux élevés pour désinfecter les produits lorsque ces derniers sont mis en service.
Vpliv organskih snovi na pitno vodo - Ugotavljanje zahtevanega klora – Preskusna metoda
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Vpliv organskih snovi na pitno vodo - Ugotavljanje zahtevanega klora – Preskusna metodaEinfluss organischer Materialien auf Wasser für den menschlichen Gebrauch - Bestimmung der Chlorzehrung - PrüfverfahrenInfluence des matériaux organiques sur l'eau destinée a la consommation humaine - Détermination de la demande en chlore - Méthode d'essaiInfluence of organic materials on water intended for human consumption - Determination of the chlorine demand - Test method13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 14718:2006SIST EN 14718:2007en01-januar-2007SIST EN 14718:2007SLOVENSKI
SIST EN 14718:2007
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14718August 2006ICS 13.060.20; 23.040.20; 67.250 English VersionInfluence of organic materials on water intended for humanconsumption - Determination of the chlorine demand - TestmethodInfluence des matériaux organiques sur l'eau destinée à laconsommation humaine - Demande en chlore - Méthoded'essaiEinfluss organischer Materialien auf Wasser für denmenschlichen Gebrauch - Bestimmung der Chlorzehrung -PrüfverfahrenThis European Standard was approved by CEN on 30 June 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, 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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14718:2006: ESIST EN 14718:2007
EN 14718:2006 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative References.4 3 Terms and Definitions.4 4 Principle.5 5 Reagents.5 5.1 Sodium hypochlorite solution.5 5.2 Test water.5 5.3 Rinsing water.5 5.4 Cleaning lìquids for apparatus.6 6 Apparatus for Chlorine Demand Assessment.6 7 Procedural Constraints.6 8 Samples of Products and Test Pieces.7 8.1 Factory made products.7 8.2 Site applied products.8 8.3 Surface-area-to-volume ratio (S/V).9 9 Preparation of Test Water and Apparatus.10 9.1 Test water.10 9.2 Preparation of apparatus.10 9.3 Cleaning of the glassware.10 9.4 Cleaning of stainless steel.10 10 Test Procedure.11 10.1 General.11 10.2 Flushing.11 10.3 Stagnation.11 10.4 Pre-washing.11 10.5 Determination of chlorine demand.11 10.6 Determination of free chlorine.12 11 Expression of Results.12 11.1 Description of the calculation.12 11.2 Validation of the test results.13 12 Test Report.13 a) Information on the product.13 b) Information on the procedure.13 c) Test results.14 Annex A (normative)
Procedure for establishing the suitability of apparatus and test water.15 Annex B (informative)
Arrangement for flushing large diameters pipes.16
SIST EN 14718:2007
EN 14718:2006 (E)
3 Foreword This document (EN 14718:2006) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2007, and conflicting national standards shall be withdrawn at the latest by February 2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, 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.
SIST EN 14718:2007
EN 14718:2006 (E) 4 1 Scope This standard specifies a method for determining the chlorine demand of organic materials intended for use in contact with drinking water. The standard is applicable to factory made and site applied products used for the distribution, transport and storage of drinking water. The standard does not cover the use of high levels of chlorine to disinfect products when they are put into service. 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. EN ISO 7393-2:2000, Water quality - Determination of free chlorine and total chlorine - Part 2: Colorimetric method using N,N-diethyl- 1,4-phenylenediamine for routine control purposes (ISO 7393-2:1985) 3 Terms and Definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 chlorine demand ability of a material in contact with chlorinated water to remove/reduce the concentration of free chlorine (see clause 2.1 of EN ISO 7393-2:2000)
in the water compared with a reference sample 3.2 test water water used for testing purposes prepared with a free-chlorine content as described in
5.2 3.3 rinsing water test water without added chlorine 3.4 contact water test water (see 3.2) which has been in contact with a test piece under specified conditions 3.5 blank water test water (see 3.2) which has been kept at the same specified conditions (e.g. temperature, contact time, contact with any sealing material) as contact water but without contact with the test piece 3.6 flushing water tap water SIST EN 14718:2007
EN 14718:2006 (E)
5 3.7 product manufactured item, in its finished form 3.8 sample one or more units, or a specified quantity of a product, selected
from a batch or lot 3.9 test piece sample or portion of it which is tested to obtain a single test result 3.10 factory made products products made in a factory under controlled conditions as part of the manufacturing process 3.11 site applied products
manufactured item(s) for application on-site and subsequent contact with water. In this context the product is the final prepared surface that comes into contact with water 4 Principle Initially test pieces are pre-conditioned by washing and rinsing procedures. Test pieces are then completely filled with or immersed in test water. This filling or immersion procedure is carried out three times on the same test pieces under specified conditions. After each contact period the contact water is immediately analyzed to determine the residual content of free chlorine. Blank tests without test pieces are undertaken with the same test water to obtain blank water results. NOTE If the reduction in the free-chlorine concentration of the test water in contact with the test material is particularly high, the test will have to be repeated using fresh test samples and a reduced S/V test ratio (see 8.3). The chlorine demand of the material is based on the difference between the free chlorine content of the contact water (see 3.4) and of the blank water (see 3.5). 5 Reagents 5.1 Sodium hypochlorite solution Sodium hypochlorite solution, with a concentration of about 0,1 % by mass of free chlorine determined in accordance with EN ISO 7393-2, to be prepared from a commercial solution of sodium hypochlorite (NaOCl). As this sodium hypochlorite solution is unstable, it shall be prepared on the day of use. 5.2 Test water Test water shall have a conductivity of < 2 mS/m and a total organic carbon content (TOC) of < 0,2 mg/l C (e.g. prepared by reverse osmosis, deionization or distilllation, followed by activated carbon filtration) and the addition of sodium hypochlorite solution (see 5.1) to (1,0 ± 0,1) mg/l of free chlorine. The test water shall be stable in the absence of light, such that the depletion of free chlorine shall not exceed 0,1 mg/l during the contact period i.e. (72 ± 2) h at (23 ± 2) °C, when stored without contact with a test piece. 5.3 Rinsing water Test water (see 5.2) without added chlorine. SIST EN 14718:2007
EN 14718:2006 (E) 6 5.4 Cleaning lìquids for apparatus Use one or more of the following cleaning liquids, if appropriate: biodegradable detergent; hydrochloric acid, 2 mol/l (analytical grade); hydrogen peroxide, 3 % vol/vol (analytical grade); nitric acid, 1,5 mol/l (analytical grade). 6 Apparatus for Chlorine Demand Assessment 6.1 Materials Vessels, containers, connectors and stoppers, shall be made of materials which do not consume free chlorine under the conditions of the test (see annex A). NOTE Suitable materials include glass and stainless steel. 6.2 Test vessels Test vessels shall be designed for filling without headspace (ullage). They shall be reserved for chlorine demand testing only and cleaned separately from other items. 6.3 Equipment Equipment, capable of maintaining the test temperature of (23 ± 2) °C, for the duration of the test. 7 Procedural Constraints Unlike migration tests, the chlorine demand test starts with a fixed concentration of free chlorine and a realistic surface area to volume (S/V ) ratio according to Tables 1 and 2. At the end of each contact period there shall be a minimum concentration of free chlorine (see 11.2.3). NOTE To ensure the results are reliable it is necessary to limit the reduction of free chlorine by fixing a minimum concentration for free chlorine after the contact period. This is achieved by adapting the best surface area to volume (S/V) ratio. SIST EN 14718:2007
EN 14718:2006 (E)
7 8 Samples of Products and Test Pieces 8.1 Factory made products 8.1.1 General 126.96.36.199 Sampling of products shall be performed in accordance with the relevant product standard, system standard or the national regulations, where applicable. 188.8.131.52 Care shall be taken that the transport conditions shall not influence the test results. 184.108.40.206 If it is necessary to store samples before testing, they shall be protected from contamination. If the manufacturer provides written storage instructions they shall be followed. The samples shall be stored in their original form as delivered. Where appropriate, storage containers shall be cleaned using the same procedures used for the test containers. 220.127.116.11 For a product where only part of its surface will come into contact with drinking water, the test piece(s) shall be prepared so that only this part of its surface is exposed to the test water (see 5.2). 18.104.22.168 If the preparation procedure for a test piece of a particular type of prod