1、March 2015 Translation by DIN-Sprachendienst.English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、13.060.20; 67.250!%“2299994www.din.deDDIN EN 14718Influence of organic materials on water intended for humanconsumption Determination of the chlorine demand Test method;English version EN 14718:2014,English translation of DIN EN 14718:2015-03Einfluss organischer Materialien auf Wasser fr den menschl
3、ichen Gebrauch Bestimmung der Chlorzehrung Prfverfahren;Englische Fassung EN 14718:2014,Englische bersetzung von DIN EN 14718:2015-03Influence des matriaux organiques sur leau destine la consommation humaine Determination de la demande en chlore Mthode dessai;Version anglaise EN 14718:2014,Traductio
4、n anglaise de DIN EN 14718:2015-03SupersedesDIN EN 14718:2006-10www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 19 pages 02.15 DIN EN 14718:2015-03 2 A comma is used as the decimal marker. National foreword This document (EN 14718:2014)
5、 has been prepared by Technical Committee CEN/TC 164 “Water supply” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was the DIN-Normenausschuss Wasserwesen (DIN Standards Committee Water Practice), Working Committee NA 119-04-14 AA Werkstoffe und Bauteile in Kon
6、takt mit Trinkwasser. Amendments This standard differs from DIN EN 14718:2006-10 as follows: a) the standard has been editorially revised; b) in Subclause 11.2.3 “Validation of blank tests”, an error in Formula (2) has been corrected. Previous editions DIN EN 14718: 2006-10 EUROPEAN STANDARD NORME E
7、UROPENNE EUROPISCHE 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 matriaux organiques sur leau destine la consommation
8、 humaine - Dtermination de la demande en chlore - Mthode dessai Einfluss organischer Materialien auf Wasser fr den menschlichen Gebrauch - Bestimmung der Chlorzehrung - Prfverfahren This European Standard was approved by CEN on 18 October 2014. CEN members are bound to comply with the CEN/CENELEC In
9、ternal 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 a
10、ny 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
11、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, Norw
12、ay, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of explo
13、itation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14718:2014 EEN 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 Ri
14、nsing 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 facto
15、ry 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
16、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 water
17、s 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 DINEN 14718:2015-03EN 14718:2014 (E) 3 11.2.4
18、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 DINEN 14718:2015-03EN 14718:2014 (E) 4 Foreword This document (EN 14718:2014) has be
19、en 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 standar
20、ds 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 unde
21、r 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 n
22、ational 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,
23、Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DINEN 14718:2015-03EN 14718:2014 (E) 5 1 Scope This European Standard specifies a method for determining the chlorine demand of organic materia
24、ls 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 t
25、hey 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 doc
26、ument (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 docu
27、ment, 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 purpose
28、s 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
29、 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 DIN EN 14718:2015-03 EN 14718:2014(E)6 3.8 sample one or more units, or a specifie
30、d 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
31、 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 w
32、ith 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 ar
33、e 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). T
34、he 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 dete
35、rmined 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 0,2 mg/l corrective measures should be t
36、aken.; reference to this standard and to the referring standard or national regulation, if applicable; number of test pieces used together in a test, if applicable; volume of the test liquid (V) in litres; surface area of the test piece exposed to the test liquid (S) in square decimetres calculated
37、from the actual dimensions of the test pieces; actual S/V ratio; any deviation from the test procedure specified in this standard; any factors which may have affected the results, such as any incidents or any operating details not specified in this standard; dates of start and completion of the test
38、. c) Test results The test results shall include the calculated chlorine demand data for the three periods (CD1, CD2and CD3- see 11.1). DINEN 14718:2015-03EN 14718:2014(E)14 Annex A (normative) Procedure for establishing the suitability of apparatus and test water The apparatus used for testing shal
39、l conform with the requirement that free-chlorine depletion shall not exceed 0,1 mg/l for each contact period. If new glassware or related items are introduced then this requirement shall be satisfied by pre-testing (blank test procedure). After the test procedure has been undertaken for the first t
40、ime it is recommended that the test vessels are kept permanently filled with test water between tests to avoid deterioration of the surface with regard to the chlorine depletion. After the third test exposure, the vessel shall be refilled completely with test water and stored under test conditions (
41、room temperature, not exposed to light) until the next test starts in the following week (typically Thursday through Tuesday). During these five days, chlorine depletion shall not exceed 0,15 mg Cl2/l, otherwise the results show the need to clean the vessel. To obtain the depletion rates of the blan
42、ks (see 5.2) and the figures mentioned above for between tests, test water shall conform with 5.2. This shall be verified each time the tests are undertaken. If the tests are not carried out continuously, or if the test vessels are not kept continuously filled with chlorinated water, each test shall
43、 be preceded by a controlled filling and evaluation of the actual chlorine depletion of the test vessels as described above. DINEN 14718:2015-03EN 14718:2014 (E) 15 Annex B (informative) Arrangement for flushing large diameters pipes An alternative arrangement for flushing large diameter pipes is sh
44、own in Figures B.1 and B.2. This arrangement is designed to produce the required flow rate over the surface of the test piece while using the minimum quantity of water. The device is a cylinder made of inert material (see 6.1) with a diameter less than that of the internal diameter of the test piece
45、. It is essential for the diameter of the cylinder be at least 10 mm less than that of the internal diameter of the test piece. This will leave a gap of at least 5 mm between the wall of the cylinder and the test piece. If the gap is any smaller than this, there will possibly be too much resistance
46、to the waterflow. The wash water is delivered from a mains tap via a valve and flow meter through a pipe to a space at the bottom of the cylinder. The cylinder is supported on the base plate by three or four short legs. The space into which the pipe delivers the water should allow for equal flow of
47、wash water over the whole inside of the test piece. The space has an air vent which is opened at the start of the washing period in order to let out the air which would otherwise be trapped in the distribution space. Most of the volume of the cylinder is empty space which can be filled with e.g. wat
48、er or sand in order to stabilize the setup. Towards the top of the cylinder there is an adjustable ring with three or four screws to adjust the height of the ring for different lengths of test pieces. There are also three or four screws which can be tightened into the outside of the test pieces in order to ensure that the cylinder is centred within the test piece, thus ensuring equal flows of wash water over the whole inside surface of the test piece. The position of the ring is adjusted to allow a free flow of wate
