1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 852-1 : 1996 BS 278
2、2 : Part 11 : Method 1122A : 1996 The European Standard EN 852-1 : 1996 has the status of a British Standard ICS 23.040.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Plastics piping systems for the transport of water intended for human consumption Migration assessment Par
3、t 1. Determination of migration values of plastics pipesThis British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 November 1996 BSI 1996 The following BSI refer
4、ences relate to the work on this standard: Committee reference PRI/61 Draft for comment 92/47152 DC ISBN 0 580 26266 9 BS EN 852-1 : 1996 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entr
5、usted to Technical Committee PRI/61, Plastics piping systems and components, upon which the following bodies were represented: British Gas Plc British Plastics Federation British Plumbing Fittings Manufacturers Association British Valve and Actuator Manufacturers Association Chartered Institution of
6、 Water and Environmental Management Department of the Environment (British Board of Agre ment) Department of the Environment (Building Research Establishment) Department of the Environment (Property and Buildings Directorate) Department of Transport Electricity Association Federation of Civil Engine
7、ering Contractors Health and Safety Executive Institute of Building Control Institute of Materials Institution of Civil Engineers Institution of Gas Engineers National Association of Plumbing, Heating and Mechanical Services Contractors Pipeline Industries Guild Plastics Land Drainage Manufacturers
8、Association Society of British Gas Industries Society of British Water Industries Water Companies Association Water Services Association of England and Wales The following bodies were also represented in the drafting of the standard, through subcommittees and panels: ERA Technology Ltd. Engineering
9、Equipment and Materials Users Association RAPRA Technology Ltd.BS EN 852-1 : 1996 BSI 1996 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Method 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Principle 3 5 Reagents 3 6 Test temperatures 4 7 Apparatus
10、4 8 Test pieces 4 9 Procedure 4 10 Expression of results 5 11 Test report 5 Annexes A (normative) Test liquids 6 B (normative) Additional procedures for testing pipes with nominal size in excess of 80 6 C (informative) Bibliography 7 Figures B.1 Test arrangement 1 8 B.2 Test arrangement 2 9 B.3 Cros
11、s section pipe segment 10ii BSI 1996 BS EN 852-1 : 1996 National foreword This British Standard has been prepared by Technical Committee PRI/61 and is the English language version of EN 852-1 : 1996 Plastics piping systems for the transport of water intended for human consumption Migration assessmen
12、t Part 1: Determination of migration values of plastics pipes, published by the European Committee for Standardization (CEN). It is incorporated into BS 2782 Methods of testing plastics Part 11: Thermoplastics pipes, fittings and valves, as Method 1122A : 1996, for association with related test meth
13、ods for plastics materials and plastics piping components. This test method has been prepared for reference by other standards under preparation by CEN for specification of plastics piping systems and components. It has been implemented to enable experience of the method to be gained and for use for
14、 other fresh applications. It is also for use for the revision or amendment of other national standards as practicable, but it should not be presumed to apply to the purposes of BS 6920 or to any other existing standard or specification which contains or makes reference to a different test method un
15、til that standard/specification has been amended or revised to make reference to this method and adjust any requirements as appropriate. Cross-references Publication referred to Corresponding British Standard ISO 3696 : 1987 BS EN ISO 3696 : 1995 Water for analytical laboratory use Specification and
16、 test methods ISO 7393-2 : 1985 BS 6068 Water quality Part 2 Physical, chemical and biochemical methods Section 2.26 : 1986 Method for determination of free chlorine and total chlorine : colorimetric method using N,N-diethyl- 1,4-phenylenediamine, for routine control purposes NOTE 1. There is no Bri
17、tish Standard identical to EN 1420-1 pending the ratification thereof and its implementation as BS EN 1420-1. NOTE 2. In equation B.3 the preferred expression for tg (a ) is tan (a ). NOTE 3. In B.5, to clarify the variables a anda, references should have been made in the text to figure B.3 and a sh
18、ould be taken to mean the arc length on the inside surface of the pipe segment. Also in B.5, in the second paragraph and in the two definitions of A, reference is made to a hatched circle segment, but no hatched area is shown on the figures in EN 852-1 : 1996 as ratified. Pending issue of a correcti
19、on, the area A should be interpreted as corresponding to the cross-sectional area of the channel provided by the test piece G to contain the relevant liquid when arranged as shown in figure B.1. Hence A is the area of the segment of the cross section shown in figure B.3 as bounded by the pipe intern
20、al cross section up to the height h. This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 10, an inside back cover and a back cover. Warning note. This British Standard, which is identical with EN 852-1 : 1996, does not necessarily detail all the precautions neces
21、sary to meet the requirements of the Health and Safety at Work etc. Act 1974. Attention should be paid to any appropriate safety precautions and the method should be operated only by trained personnel. Compliance with a British Standard does not of itself confer immunity from legal obligations.CEN E
22、uropean Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No
23、. EN 852-1 : 1996 E EUROPEAN STANDARD EN 852-1 NORME EUROPE ENNE EUROPA ISCHE NORM May 1996 ICS : 23 040 20 Descriptors: Water pipelines, potable water, plastics tubes, tests, estimation, migrations, components English version Plastics piping systems for the transport of water intended for human con
24、sumption Migration assessment Part 1: Determination of migration values of plastics pipes Syste mes de canalisations plastiques pour le transport deau destine ea la consommation humaine E valuation de la migration Partie 1: De termination des valeurs de migration des tubes plastiques Kunstoff-Rohrle
25、itungssysteme fu r den Transport von Wasser fu r den menschlichen Verzehr Bewertung der Migration Teil 1: Bestimmung der Migrationswerte von Kunststoff Rohren This European Standard was approved by CEN on 1996-01-27. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which sti
26、pulate 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 Central Secretariat or to any CEN member. This European Standard
27、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 Central Secretariat has the same status as the official versions. CEN members are the national standards
28、 bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 852-1 : 1996 BSI 1996 Foreword This European Standard has been prepared by Technical Committee CEN/TC 15
29、5, Plastics piping systems and ducting systems, the secretariat of which is held by NNI, and consists of two Parts: Part 1: Determination of migration values of plastics pipes; Part 2: Determination of the number of migrations and conversion of laboratory values. This European Standard shall be give
30、n the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 1996, and conflicting national standards shall be withdrawn at the latest by November 1996. It is based on ISO 8795 : 1990 Plastics pipes for the transport of water intended f
31、or human consumption Extractibility of constituents Test method, published by the International Organization for Standardization (ISO). It differs from ISO 8795 : 1990 due to the need for the test method to be applicable to European conditions and practice. The main modifications are: a) test liquid
32、s: pH 11, which is not a European condition, is deleted; 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 mg/l; b) a stagnation period has been added; c) exposure time: 72 h is specified;
33、 d) temperatures: 27 C is deleted (tropical condition not relevant to Europe); 70 C is specified for moderate hot water conditions; e) large diameter pipes: a test arrangement for large diameter pipes has been added. Annex A, which is normative, describes the preparation of test liquids. Annex B, wh
34、ich is normative, describes additional procedures for testing pipes with nominal sizes in excess of 80. Annex C, which is informative, gives a bibliography. When a standard on this subject covering the requirements in the referring standard is issued by CEN/TC 164, this CEN/TC 155 standard will be w
35、ithdrawn. This standard is one of a series of standards on test methods which support system standards for plastics piping systems and ducting systems. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europ
36、ean Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.Page 3 EN 852-1 : 1996 BSI 1996 1 Scope This standard specifies a method for the determination of the migra
37、tion of constituents from the internal surface of plastics pipes. Organoleptic and microbiological assessments are not included. This standard is applicable to all plastics pipes to be used for the transport of water intended for human consumption and raw water used for the manufacturing of water in
38、tended for human consumption. It covers all 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 material, the relevant test conditions need to be stated in the system s
39、tandard concerned. 2 Normative references This standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to
40、, or revisions of, any of these publications apply to this standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 1420-1 Influence of materials on water intended for human consumption Organic materials Pipe
41、s, fittings and their coatings used in piping systems Odour and flavour assessment of water Part 1: Test method ISO 3696 : 1987 Water for analytical laboratory use Specification and test methods ISO 7393-2 : 1985 Water quality Determination of free chlorine and total chlorine Part 2: Colorimetric me
42、thod using N,N-diethyl-1,4-phenylenediamine, for routine control purposes 3 Definitions For the purposes of this standard the following definitions apply: 3.1 migration Movement of substances from one material (plastics pipe) into another (test liquid). 3.2 test liquid A specified water for migratio
43、n testing. 3.3 migration value (M) The mass of constituent(s) migrated from a specified inner surface area of a pipe test piece exposed to a test liquid at a specified temperature over a specified time. 3.4 tapwater Water intended for human consumption. 4 Principle Test pieces are subjected to stagn
44、ation and prewashing with tapwater for a specified time. The test pieces are then filled with the specified test liquid at a specified temperature and kept for a series of specified migration periods. The test liquid is then analysed to assess any constituents which were able to migrate. NOTE. It is
45、 assumed that the following test parameters are set by the standard making reference to this standard: a) the test liquid(s) (see 5.2); b) the test temperature, T, if other than as given in clause 6; c) the number of pairs of test pieces (see 8.3); d) the constituents for which analysis is to be mad
46、e both upon test pieces and the blank test and the required accuracy, taking account of 9.5 (see also clause 10). 5 Reagents 5.1 Water, conforming to grade 3 of ISO 3696 : 1987, with the following characteristics: a) a conductivity of# 10 mS/m at 25 C; b) total organic carbon (TOC) content# 0,2 mg/l
47、 (as carbon); c) negligible concentrations of any measurable substances that could interfere with measurements to determine a) and b). 5.2 Test liquids NOTE. Methods for the preparation of test liquids are given in annex A. 5.2.1 Water, conforming to 5.1. 5.2.2 Chlorinated water, conforming to 5.1 w
48、ith an active chlorine concentration of (1 0,2) mg/l. 5.2.3 Acidic water, comprising water conforming to 5.1, adjusted to a pH of (4,5 0,1) with a KH 2 PO 4 buffer solution conforming to A.1.2. 5.2.4 Chlorinated acidic water, comprising water conforming to 5.1, adjusted to a pH of (4,5 0,1) with aK
49、H 2 PO 4 buffer solution conforming to A.1.2 and an active chlorine concentration of (1 0,2) mg/l. 5.2.5 Alkaline water, comprising water conforming to 5.1, adjusted to a pH of (9,0 0,1) with a boric acid buffer solution conforming to A.1.3. 5.3 Selection of test liquids 5.3.1 For cold water applications the test liquids shall conform to 5.2.1 to 5.2.5 inclusive. 5.3.2 For warm and hot water applications (see clause 6) the test liquid shall conform to 5.2.1.Page 4 EN 852-1 : 1996 BSI
