BS EN 1120-1996 Plastics piping systems - Glass-reinforced thermosetting plastics (GRP) pipes and fittings - Determination of the resistance to chemical attack from the inside of a.pdf

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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1120 : 1996 BS 2782

2、 : Part 12 : Methods 1209 A and B : 1996 The European Standard EN 1120 : 1996 has the status of a British Standard ICS 23.040.20; 23.040.45 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Plastics piping systems Glass-reinforced thermosetting plastics (GRP) pipes and fittings

3、Determination of the resistance to chemical attack from the inside of a section in a deflected conditionThis 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 1

4、5 September 1996 BSI 1996 The following BSI references relate to the work on this standard: Committee reference PRI/61 Draft for comment 93/309421 DC ISBN 0 580 25898 X BS EN 1120 : 1996 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard

5、The preparation of this British Standard was entrusted to Technical Committee PRI/61, Plastics piping and components, upon which the following bodies were represented: British Gas plc British Plastics Federation British Plumbing Fittings Manufacturers Association British Valve and Actuator Manufactu

6、rers Association Chartered Institution of 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 Electrici

7、ty Association Federation of Civil Engineering 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 Gu

8、ild Plastics Land Drainage Manufacturers 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

9、 panels: Association of Consulting Engineers Engineering Equipment and Materials Users Association Institution of Mechanical Engineers RAPRA Technology Ltd.BS EN 1120 : 1996 BSI 1996 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Method 1 Scope 3 2 Normativ

10、e references 3 3 Definitions 3 4 Principle 3 5 Test liquid 3 6 Apparatus 3 7 Test pieces 4 8 Determination of the dimensions of the test piece 4 9 Conditioning 4 10 Test procedure using deflection measurement 5 11 Test procedure using strain measurement 6 12 Calculation of extrapolated value 6 13 Te

11、st report 7 Tables 1 Failure time distribution 5 2 Inspection intervals 5 Figure 1 Typical test arrangement 4ii BSI 1996 BS EN 1120 : 1996 National foreword This British Standard has been prepared by Technical Committee PRI/61 and is the English language version of EN 1120 : 1996 Plastics piping sys

12、tems Glass-reinforced thermosetting plastics (GRP) pipes and fittings Determination of the resistance to chemical attack from the inside of a section in a deflected condition, published by the European Committee for Standardization (CEN). It is incorporated into BS 2782 Methods of testing plastics:

13、Part 12 Reinforced plastics pipes, fittings and valves, as Methods 1209A and B : 1996, for association with related test methods for plastics materials and plastics piping components. Method 1209A designates the method based on the test procedure using deflection measurement (see clause 10) and Meth

14、od 1209B designates the method based on the test procedure using strain measurement (see clause 11). EN 1120 : 1996 has been prepared for reference by other standards under preparation by CEN for specification of reinforced plastics piping systems and components. It has been implemented to enable ex

15、perience of the test methods to be gained and for use for 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 any existing standard or specification which contains or makes reference to a dif

16、ferent test method until that standard/specification has been amended or revised to make reference to this test method and any requirements adjusted as appropriate. Cross-reference Publication referred to Corresponding British Standard EN 705 : 1994 BS EN 705 : 1995 BS 2782 : Part 12 : Method 1220A

17、and B : 1995 Plastics piping systems Glass-reinforced thermosetting plastics (GRP) pipes and fittings Methods for regression analyses and their use WARNING. This British Standard, which is identical with EN 1120 : 1996, does not necessarily detail all precautions necessary to meet the requirements o

18、f 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 European Committee for Standard

19、ization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN 1120 : 1996 E EUROPEAN STANDARD EN 1120 NORME EUROPE ENNE EUROPA ISCHE NORM March 1996 ICS 23.040.20; 23.040.45 Des

20、criptors: Plastic tubes, reinforced plastics, glass-reinforced plastics, thermosetting resins, pipe fittings, tests, chemical resistance, chemical attack English version Plastics piping systems Glass-reinforced thermosetting plastics (GRP) pipes and fittings Determination of the resistance to chemic

21、al attack from the inside of a section in a deflected condition Syste mes de canalisations plastiques Tubes et raccords en plastique thermodurcissable renforce de verre (PRV) De termination de la re sistance a une attaque chimique par linte rieur dun tronc on de tube soumis a d e flexion Kunststoff-

22、Rohrleitungssysteme Rohre und Formstu cke aus glasfaserversta rkten duroplastischen Kunststoffen (GFK) Ermittlung der Widerstandsfa higkeit gegen Chemikalieneinwirkung von der Innenseite eines Abschnittes im verformten Zustand This European Standard was approved by CEN on 1995-10-14. CEN members are

23、 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 t

24、he 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 translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same sta

25、tus as the official versions. CEN members are the national standards 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 1120 : 1996 BSI 1996 E Foreword This

26、 European Standard has been prepared by Technical Committee CEN/TC 155, Plastics piping systems and ducting systems, the Secretariat of which is held by NNI. This standard is based on document N 191 Glass reinforced thermosetting plastics (GRP) pipes and fittings Test method for resistance of a pipe

27、 in a deflected condition to chemical attack from the inside, prepared by Working Group 1 of Subcommittee 6 of Technical Committee 138 of the International Organization for Standardization (ISO). It is a modification of ISO/TC 138/SC 6/WG 1 N 191 for reasons of applicability to other test conditions

28、 and alignment with texts of other standards on test methods. Following a request from some experts in the committee, this standard contains a concept for structural failure as an alternative failure mode to the traditional weep failure (see note 2 to clause 1). The extension of the failure modes wi

29、ll be considered in a future revision following consideration of results of tests performed using these criteria. The modifications are: concept of a second failure mode (structural failure) is added; test parameters are omitted; material-dependent requirements are not given; editorial changes have

30、been introduced. The material-dependent test parameters and/or performance requirements are incorporated in the referring standard. This standard is one of a series of standards on test methods which support System Standards for plastics piping systems and ducting systems. This standard shall be giv

31、en the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 1996, and conflicting national standards shall be withdrawn at the latest by September 1996. According to the CEN/CENELEC Internal Regulations, the following countries are b

32、ound to implement this 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 1120 : 1996 BSI 1996 E 1 Scope This standard specifies a method for determinin

33、g the chemical resistance properties of glass-reinforced thermosetting plastics (GRP) pipes and fittings in a deflected condition for nominal sizes DN 100 and larger. In conjunction with EN 705 this standard provides a method for evaluating the effect of a chemical environment on the interior of a p

34、ipe or fitting after a specified period of time. NOTE 1. It has been found that the effect of chemical environments can be accelerated using strain induced by deflection, hence it is frequently referred to as strain corrosion. NOTE 2. To study the applicability of the method to testing the pipe or f

35、itting with regard to structural failure (where structural failure becomes apparent by a sudden reduction in the load applied of at least 20 % of the initial load) then where weep failure is referred to in this standard substitute structural failure. A structural failure can be caused by conditions

36、such as: interlaminar separation; cracks in or through the structural layer of the wall; tensile failure of the glass reinforcement; if applicable, separation of a thermoplastics liner from the structural wall. For such studies, data from structural failure results will be analysed separately from w

37、eep failure results. 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

38、to, 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 705 Plastics piping systems Glass-reinforced thermosetting plastics (GRP) pipes and fittin

39、gs Methods for regression analyses and their use 3 Definitions For the purposes of this standard, the following definitions apply: 3.1 mean diameter (d m ) The diameter of the circle corresponding with the middle of the pipe wall cross-section. It is given, in millimetres, by either of the following

40、 equations: d m = d i + e d m = d e 2 e where: d i is the internal diameter, in millimetres; d e is the external diameter, in millimetres; e is the wall thickness of the pipe, in millimetres. 3.2 weep failure Failure which becomes apparent by the passage of the test liquid through the pipe wall. 4 P

41、rinciple The interior of a test piece is exposed to a corrosive test liquid at a specified temperature while being maintained in a fixed diametrically deflected condition. The test is repeated at several deflection levels, using a fresh test piece each time and recording the time to weep failure at

42、each deflection. The results are used to calculate an extrapolated deflection value for a specified period of time. Alternatively the extrapolation can be performed using calculated or measured strains. Strain can be measured by the use of strain gauges. NOTE 1. Use of strain allows testing using te

43、st pieces of variable thickness and stiffness classes. Deflection and strain are interrelatable by calculation. NOTE 2. It is assumed that the following test parameters are set by the standard making reference to this standard: a) the composition of the test liquid (see clause 5); b) the number and

44、length of test pieces (see clause 7); c) if applicable, the conditioning to be applied (see clause 9); d) the test temperature (see 10.1 or 11.1); e) if failures do not occur (see 10.11 or 11.11), the specified deflection levels and related minimum time intervals; f) the time to which the data have

45、to be extrapolated (see clause 12). 5 Test liquid The test liquid shall be as specified in the referring standard. The quantity shall be sufficient to achieve the specified depth within the test piece (see 10.7 or 11.7). 6 Apparatus 6.1 Loading frame, comprising two parallel steel sections, with or

46、without bearing plates, and threaded rods which can maintain a constant deflection of the test piece (see figure 1). The surfaces in contact with the test piece shall be hard, flat, smooth and clean. The sections and bearing plates shall be sufficiently stiff such that visible bending or deformation

47、 of the sections or plate does not occur during the compression of the test piece. Each section or plate shall have a length at least equal to the length of the test piece plus 30 mm and a width of at least 100 mm.Page 4 EN 1120 : 1996 BSI 1996 E Figure 1. Typical test arrangement 6.2 Dimensional me

48、asurement devices, capable of determining: the dimensions (length, diameter, wall thickness) to an accuracy of within 0,5 % ; the change in diameter of the test piece in the vertical direction to an accuracy of within 1,0 % of the maximum value of the change. 6.3 Load indicator (optional), capable o

49、f determining the load to an accuracy of within 2 % of the initial load. NOTE. Such devices include machined sections made from steel, together with strain gauges and mobile measuring instruments with suitable output devices. 6.4 Strain gauges of the foil type, single element suitable for strain levels up to 1,5 % strain and a length appropriate for the pipe diameter. 7 Test pieces 7.1 Preparation The test piece shall comprise a complete ring cut from the pipe or fitting to be