Influence of organic materials on water intended for human consumption - Determination of the chlorine demand - Test method

This European Standard specifies a method for determining the chlorine demand of organic materials intended for use in contact with drinking water.
This European Standard is applicable to factory made and site applied products used for the distribution, transport and storage of drinking water.
This European 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 Europäische 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 européenne spécifie une méthode de détermination de la demande en chlore des matériaux organiques destinés à entrer en contact avec l’eau potable.
Elle 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.
Elle 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 potrebnega klora - Preskusna metoda

General Information

Status
Published
Publication Date
02-Dec-2014
Current Stage
9093 - Decision to confirm - Review Enquiry
Completion Date
23-Jun-2021

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Vpliv organskih snovi na pitno vodo - Ugotavljanje potrebnega klora - Preskusna metodaEinfluss organischer Materialien auf Wasser für den menschlichen Gebrauch - Bestimmung der Chlorzehrung - PrüfverfahrenInfluence des matériaux organiques sur l'eau destinée à 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 14718:2014SIST EN 14718:2015en,fr,de01-februar-2015SIST EN 14718:2015SLOVENSKI

STANDARDSIST EN 14718:20071DGRPHãþD
SIST EN 14718:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14718
December 2014 ICS 13.060.20; 67.250 Supersedes EN 14718:2006English Version

Influence of organic materials on water intended for human consumption - Determination of the chlorine demand - Test method

Influence des matériaux organiques sur l'eau destinée à la consommation humaine - Détermination de la demande en chlore - Méthode d'essai

Einfluss organischer Materialien auf Wasser für den menschlichen Gebrauch - Bestimmung der Chlorzehrung - Prüfverfahren This European Standard was approved by CEN on 18 October 2014.

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-CENELEC 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-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14718:2014 ESIST EN 14718:2015

EN 14718:2014 (E) 2 Contents Page Foreword ..............................................................................................................................................................4 1 Scope ......................................................................................................................................................5 2 Normative references ............................................................................................................................5 3 Terms and definitions ...........................................................................................................................5 4 Principle ..................................................................................................................................................6 5 Reagents .................................................................................................................................................6 5.1 Sodium hypochlorite solution ..............................................................................................................6 5.2 Test water ...............................................................................................................................................6 5.3 Rinsing water .........................................................................................................................................6 5.4 Cleaning liquids for apparatus .............................................................................................................6 6 Apparatus for chlorine demand assessment ......................................................................................7 6.1 Materials .................................................................................................................................................7 6.2 Test vessels ............................................................................................................................................7 6.3 Equipment ..............................................................................................................................................7 7 Procedural constraints ..........................................................................................................................7 8 Samples of products and test pieces ..................................................................................................7 8.1 Factory made products .........................................................................................................................7 8.1.1 General ....................................................................................................................................................7 8.1.2 Samples and test pieces of factory made products ...........................................................................8 8.2 Site applied products ............................................................................................................................8 8.2.1 General ....................................................................................................................................................8 8.2.2 Samples and test pieces of site applied products .............................................................................9 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 .................................................................................................................................... 10 10.1 General ................................................................................................................................................. 10 10.2 Flushing ............................................................................................................................................... 10 10.3 Stagnation ........................................................................................................................................... 11 10.4 Pre-washing ......................................................................................................................................... 11 10.4.1 General ................................................................................................................................................. 11 10.4.2 Flushing ............................................................................................................................................... 11 10.4.3 Rinsing ................................................................................................................................................. 11 10.5 Determination of chlorine demand ................................................................................................... 11 10.5.1 General ................................................................................................................................................. 11 10.5.2 Contact water ...................................................................................................................................... 11 10.5.3 Blank waters ........................................................................................................................................ 11 10.6 Determination of free chlorine ........................................................................................................... 11 11 Expression of results ......................................................................................................................... 12 11.1 Description of the calculation ........................................................................................................... 12 11.2 Validation of the test results .............................................................................................................. 12 11.2.1 General ................................................................................................................................................. 12 11.2.2 Validation of duplicate samples ........................................................................................................ 12 11.2.3 Validation of blank tests .................................................................................................................... 12 SIST EN 14718:2015

EN 14718:2014 (E)

3 11.2.4 Validation of test samples .................................................................................................................. 13 12 Test report ............................................................................................................................................ 13 Annex A (normative)

Procedure for establishing the suitability of apparatus and test water ................ 14 Annex B (informative) Arrangement for flushing large diameters pipes ................................................... 15

SIST EN 14718:2015

EN 14718:2014 (E) 4 Foreword This document (EN 14718:2014) 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 June 2015, and conflicting national standards shall be withdrawn at the latest by June 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This document supersedes EN 14718:2006 In this second edition, along with editorial corrections, an error in Formula (2) in 11.2.3 has been corrected. 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 14718:2015

EN 14718:2014 (E)

5 1 Scope This European Standard specifies a method for determining the chlorine demand of organic materials intended for use in contact with drinking water. This European Standard is applicable to factory made and site applied products used for the distribution, transport and storage of drinking water. This European 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 documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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 document, 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 in the water compared with a reference sample [SOURCE: EN ISO 7393-2:2000, 2.1] 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 3.7 product manufactured item, in its finished form SIST EN 14718:2015

EN 14718:2014 (E) 6 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 product product made in a factory under controlled conditions as part of the manufacturing process 3.11 site applied product manufactured item for application on-site and subsequent contact with water

Note 1 to entry: 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 analysed 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 distillation, 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. 5.4 Cleaning liquids for apparatus Use one or more of the following cleaning liquids, if appropriate: SIST EN 14718:2015

EN 14718:2014 (E)

7 — 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 migr

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