1、W 1624669 0568926 738 BRITISH STANDARD Plastics piping systems for the transport of water intended for human consumption - Migration assessment Part 1. Determination of migration values of plastics pipes The European Standard EN 852-1 : 1996 has the status of a British Standard ICs 23.040.20 NO COPY
2、ING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN BS 2782 : Part 11 : Method 1122A : 1996 852-1 : 1996 Lb24669 0568927 674 Amd. No. BS EN 852-1 : 1996 Date Text affected This British Standard, having been prepared under the direction of the Sector Board for Materiais and Chemical
3、s, was published under the authority of the Standards Board and comes into effect on 16 November 1996 O BSI 1996 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRV61, Plastics piping systems and components, upon which th
4、e following bodies were representeuROP NORM EN 852-1 May 1996 ICs : 23 O40 20 Descriptors: Water pipelines, potable water, plastics tubes, tests, estimation, migrations, components English veision Plastics piping systems for the transport of water intended for human consumption - won assessment - Pa
5、rt 1: Determination of migration values of plastics pipes Systmes de canalisations plastiques pour le tsansport deau destine la consommalion humaine - valuation de la migtation - Partie 1: Dterminaiion des valeum de migraton des tubes plastiques Kunststoff Roh Kunstoff-Rohrleitungssysteme fr den ?i.
6、ansport von Wasser fr den menschiichen Verzehr - Bewertung der mon - Teil 1: Bestimmung der Mgmhonswerte von This European Standard was approved by CEN on 199641-27. CEN members are bound to comply with the CENKENELEC Intend Regulations which stipulate the conditions for giving this European Standar
7、d 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 Centsa3 Secretariat or to any CEN member. This European Standard exists in three official versions (Engiish, French, Ge
8、m). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Centrai Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Ge
9、rmw, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norwax Portugal, Spain, Sweden, Switzerland and United Kingdom. European Committee for Standardkation Comit Europen de Nonnalisaton Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1060 Brussels O 1996 All rights
10、 of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN 852-1 : 1996 E Page 2 EN 852-1 : 1996 Foreword This European Standard has been prepared by Technid Committee CENAC 155, Plastics piping systems and ducting systems, the secre
11、tariat of which is held by “I, and consists of two Parts: - Part 1: Determimtwn of migration values of plclst2cs pipes; - Part 2: Determination of the number of migracions and convemOn of laboratory values. This European standard shall be given the status of a national standard, either by publicatio
12、n of an identical text or by endorsement, at the latest by November 1996, and conflicting national standards shail be withdrawn at the laiest by November 1996. It is based on IS0 8795 : 1990 Pkstics pipes for the tmnspori of water intended for human consumption - Extmtibilzty of constituents - Test
13、method, published by the Inkrnational Organization for Standardization (ISO). It differs km IS0 8795 : 1990 due to the need for the test method to be applicable to European conditions and practice. The main modifications are: a) test liquids - pH 11, which is not a European condition, is deleted; -
14、pH 7 has been changed to pH 9, to cover European conditions (see Directive 80/778/EEC Appendix 1.B); - addition of test liquid with an active chlorine content of 1 mg4 I b) a stagnahon period has been adda I c) exposure time: 72 h is specified; I d) temperatures: I l I 27 “C is deleted (tropical con
15、dition not relevant to Europe); 70 “C is specified for moderate hot water conditions; e) iarge diameter pipes: a test arrangement for large diameter pipes has been added. Annex A, which is normative, describes the preparation Annex B, which is normative, describes additional procedures for testing p
16、ipes with nominal sizes in excess of 80. Annex C, which is informalive, gives a bibliography. When a standard on this subject covering the requirements in the referring standard is issued by CENirC 164, this CENITC 155 standard wiil be withdram. This standard is one of a series of standards on test
17、methods which support system standards for plastics piping systms and ducting systems. According to the CENXENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Stan- Aus- Belgium, Denmark, Finland, France, Germany, Greece,
18、 Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. of test liquids. O BSI 1996 W Lb24667 05b8732 T3L = Page 3 EN 852-1 : 1996 1 scope This standard specifes a method for the determination of the migration of constituents from the i
19、nternal surface of plastics pipes. Organoleptic and microbiological assessments are not included This standard is applicable to al piastics pipes to be used for the transport of water intended for human consumption and raw water used for the manufacturing of water intended for human consumption. It
20、covers ail constituents which are extractable by water from a finished pipe. It provides for a change in procedure as necessary depending upon the size of the pipe. For each application and each materiai, the relevant test conditions need to be stated in the system standard concerned. 2 Normative re
21、ferences This standard incorporates by dated or undated reference, provisions from other publications. These nonnative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, suwent amendments to, or revisions of, any of these publi
22、cations apply to this standard ony when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 1420-1 IS0 369 : 1987 IS0 7393-2 : 1985 Influence of materials on water intended for human consumption - manic matemals - Pipes, f
23、ittings and ular coatings used in piping systems- odour andjhwur assesMt of water- Part 1: Test method Water for analytical labomtory use- S b) the test temperature, c) the number of pairs of test pieces (see 8.3); d) the constituents for which analysis is to be made both upon test pieces and the bl
24、ank test and the required accuracy, taking account of 9.6 (see also clause 10). if other than as given in clause 6 5 Reagents 6.1 Wahl conforming to grade 3 of IS0 3696 : 1987, with the following characterictics: a) a conductivity of 5 10 mWm at 25 C; b) total organic carbon (TOC) content 5 0,2 mg/l
25、 (as carbon); c) negligible concentrations of any measurable substances that could interfere with measurements to determine a) and b). 6.2 Test liquids NOTE. Methods for the preparation of test liquids are given in annex A. 6.2.1 Water, conforming to 6.1. 6.2.2 chlorinated water, conforming to 6.1 w
26、ith an active chlorine concentration of (i O,2) mg 6.2.3 Acidic water, comprisii water conforming to 6.1, adjusted to a pH of (4,5 f Oll) with a KEl2FQ4 buffer solution conforming to A.1.2. 6.2.4 chlorinated acidic waterl comprising water conforming to 6.1, dusted to a pH of (4,5 f Oll) with a KH2PO
27、4 buffer solution conforming to A.1.2 and an active chlorine concentration of (i f 0,2) mg. 6.2.6 Alkaline waterl comprising water conforming to 6.1, atjjd to a pH of (9,O f 0,l) with a boric acid buffer solution conforming to A.1.3. 6.3 Selection of test liquids 6.3.1 For cold water applications th
28、e test liquids shall conform to 6.2.1 to 6.2.6 inclusive. 6.3.2 For warm and hot water applications (see clause 6) the test liquid shall conform to 6.2.1. O BSI 1996 Lb24bb9 05b8933 978 Page 4 EN 862-1 : 1996 6 Wst temperatures Unless otherwise specified in the refening standard, the test temperatur
29、e shall be selected as follows: a) for cold water applications the test temperature is (23 f 2) OC; b) for warm water applications the test temperatwe is either (60 * 2) “C or (70 * 2) OC, depending upon the class of pipe; c) for hot water applications the test temperature is (90 f 2) “C. 7 Apparatu
30、s 7.1 Connections, stoppers and containers, made of material which is inert at the specified test conditions, such as giass or PTFE or stainless steel (see also annex B). NOTE. The material PTFE should only be used when there is a small contact area with the test liquid, thus not for containers. 7.2
31、 T1iRmLostat.icaUy controlled endmrnent in- enclosure, capable of maintaining the relevant test temperature(s) (see clause 6). 8 bst pieces 8.1 General The test pieces shali have an age of at least 14 days after manufacturing of the pipe. 8.2 Preparation For each test, take two test pieces from a pi
32、pe, each of sufncient length and surface to give the volume of the test liquid necessary to determine, with the required accuracy, the amount of any migrated consituent(s). The value of IF/v shaii not be less than 5 (dm-), where: S V is the inner surface area of test piece, in square decimetres, exp
33、osed to the test liquia is the volume of test liquid, in litres; except as follows. For pipes with nominal sizes in excess of 80, where the W value of 5 mot be confonned to, then the test arrangement shall be aciiusted to one of the methods as given in annex B. NOTE. The value of W is dependent on t
34、he analytical requirements for each specific constituent of interest, particularly the minimum concentration to be determined see d) of the note to ciause 41. The lowest due for W is then determinant- 8.3 Number The number of pairs of test pieces shall be as specified in the referring standard. 9 Pr
35、ocedure 9.1 General 9.1.1 Carry out the procedures given in 9.2 to 9.6 in duplicate at the same time. Complete the sequence consisting of stagnation (9.2), prewashing (9.3) and finally migration (9.4) within 10 days (see 9.1.2). 9.1.2 Carry out a blank test in pdel with 9.1.1, using the same test co
36、nditions (test liquid, test temperature, migration time and stoppem) in a container of sufficient volume conforming to 7.1, but made of glass. Determine at the end of each migration period (see 9.4) the concentration, Co, of each specified constituent see d) of the note to clause 41 and associated i
37、nterfering substances with the required WCUracy. NOTE. If a bulk supply of test liquid is used for the duplicate test then one blank test is sucient. 9.2 Stagnation time 9.2.1 Pipes to be tested at 23 “C 9.2.1.1 Close one end of each test piece, using a stopper (see 7.1). 9.2.1.2 Fill the test piece
38、 with tapwater and let it stand for (24 f 0,5) h at the test temperature (see clause 6). 9.2.1.3 After this period remove the water and stopper. Prewash the test piece in accordance with 9.3. 9.2.2 Pipes to be tested at elevated temperatures 9.2.2.1 Close one end of each test piece using a stopper (
39、see 7.1). 9.2.2.2 Fill the test piece with tapwater at the test temperature (see clause 6) and let it stand for (7,5 0,s) h at the test temperature. 9.2.2.3 After this period, remove the water and refiii the test piece with fresh tapwater which has been brought to the test temperature and let it sta
40、nd for (16 f 0,5) h at the test temperature. 9.2.2.4 After this period, remove the water and stopper. hewash the test piece in accorcance with 9.3. 9.3 Prewashing 9.3.1 Connect the test piece to a source of tapwater via a suitable connector (see 7.1) such that the test surface is totally covered dur
41、ing prewashing. 9.3.2 Let the tapwater flow through the test piece with a velocity between 2 C72 is the concentration of the migrated amount of each constituent, in milligrams per litre over a period of 72 h, where C72 = Cl ( or C, - Co; is the volume of test liquid, in litres; is the inner surface
42、area of test piece, in square decimetres, exposed to the test liquid V S. The results for M and C shall be expressed as Mz. and C is the migration time, in hours; is the sequence number of the migration period EXAMPLES is M for the first migration at 23 “C for a miwon time, t, of 72 h divided by 3;
43、is M for the third migration at 70 “C for a migration time, t of 72 h divided by 3; is C for the first migration at 23 “C for a is C for the third migration at 70 “C for a “; migration time, t, of 72 h; c“;3 migration time, t, of 72 h. NOTE. “he migration value M is independent of the size of the pi
44、pe tested and is expressed in mass per unit area per unit time. While the migration he is 72 h and the unit time is 24 h the factor 1L3 is introduced in the equation. For practical reasons it is assumed that the migration is linear in time. From the expression of M as M 4) dimensions of the sample:
45、nominal size and nominal wall thickness; 5) description of the test piece; standard; c) the analytical method, its accuracy and the detection limit used for the determination of the constituent) concern e) the test liquid, the type of buffer and the test temperature; f) concentsations C; g) the arit
46、hmetic mean of CT3, and Mlqa of the duplicate test pieces (see 9.1.1) for each constituent determined after the first and any subsequent h) any factors which may have afected the results, such as any incidents or any operating details not specified in this stan- i) the date of test. migEdi0n; O BSI
47、1996 Page 6 EN 852-1 : 1996 Lb24667 0568935 740 hex A (normative) Test liquids A.l Chemical solutions kl.1 Sodium hupochlorite (NaOCl) solution A solution of sodium hypochiorite (NaOCl) in water conforming to 6.1 with a concentration of 0,1% by mass available chlorine is prepared on the day of use b
48、y dilution of a sodium hypochlorite solution (technical grade) with water conforming to 6.1. NOTE. The sodium hypochlorite solution is not sufficiently stable for prior preparation. A.1.2 Acidic bwer solution H 4,5) An acidic buffer solution is prepared by dissolving 13,61 g of potassium dihydrogen
49、phosphate (KH2FQ4) in 1000 ml of water conforming to 6.1 and diluting this solution by 1 : 100 with water conforming to 6.1. 1,2 mi 0,l N HC1 per litre diluted solution is then added. A.1.3 Alkaline baer solution H 8,O) An alkaline stock bufer solution is prepared by mixing a solution A and 1000 mi of solution B as follows. Solution A shall comprise 420 mi of 0,l N sodium hydroxide in water conforming to 6.1. Solution B is made by dissolving 6,18 g of boric acid in 0,l M potassium chloride made with water conforming to 6.1 and diluting to (1000 f 1)
