BS ISO 4433-3-1998 Thermoplastic pipes - Resistance to liquid chemicals - Classification - Unplasticized poly(vinyl chloride) (PVC-U) high-impact poly(vinyl chloride) (PVC-HI) and .pdf

1、BRITISH STANDARD BS ISO 4433-3:1997 BS 2782-11: Method 1161C:1998 Thermoplastics pipes Resistance to liquid chemicals Classification Part 3: Unplasticized poly(vinyl chloride) (PVC-U), high-impact poly(vinyl chloride) (PVC-HI) and chlorinated poly(vinyl chloride) (PVC-C) pipes ICS 23.040.20BSISO 443

2、3-3:1997 This British Standard, having been prepared under the directionof the Sector Board forMaterials and Chemicals, waspublished under the authorityof the Standards Boardand comes into effect on 15March 1998 BSI 04-1999 ISBN 0 580 29136 7 National foreword This British Standard reproduces verbat

3、im ISO4433-3:1997 and implements it as the UK national standard. This international standard is incorporated into BS2782 Methods of testing plastics: Part 11: Thermoplastics pipes, fittings and valves, as Method 1161C, for association with related test methods for plastics materials and plastics pip

4、ing components. The UK participation in its preparation was entrusted to Technical Committee PRI/61, Plastics piping systems and components, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpr

5、etation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which

6、 implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. WARNING NOTE. This British

7、Standard, which is identical with ISO4433-3:1997, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc, Act1974. Attention should be paid to any appropriate safety precautions and the method should be operated only by trained personn

8、el. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document compri

9、ses a front cover, an inside front cover, pages i and ii, theISO title page, page ii, pages 1 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front c

10、over. Amendments issued since publication Amd. No. Date CommentsBSISO 4433-3:1997 BSI 04-1999 i Contents Page National foreword Inside front cover Foreword ii Text of ISO 4433-3 1 Introduction 1 1 Scope 1 2 Normative reference 1 3 Symbols 1 4 Principle 1 5 Determination of chemical resistance 1 6 Cl

11、assification of the chemical resistance 7 7 Test report 7 Annex A (informative) Bibliography Inside back cover Figure 1 Classification diagram for PVC-U, PVC-HI and PVC-C pipes based on change in mass 4 Figure 2 Classification diagram for PVC-U, PVC-HI and PVC-C pipes based on percentage change in e

12、lastic modulus 5 Figure 3 Classification diagram for PVC-U, PVC-HI and PVC-C pipes based on the percentage change in tensile strength at break 6 Figure 4 Classification diagram for PVC-U, PVC-HI and PVC-C pipes based on the percentage change in elongation at break 7 Table 1 Determination of chemical

13、 resistance from the mean percentage change in mass %m after112days immersion 3 Table 2 Determination of chemical resistance from the mean percentage change in elastic modulus Q Eafter112days immersion 5 Table 3 Determination of chemical resistance from the mean percentage change in tensile strength

14、 at break Q tbafter112days immersion 6 Table 4 Determination of chemical resistance from the mean percentage change in elongation at break Q bafter112days immersion 7ii blankBSISO4433-3:1997 ii BSI 04-1999 Foreword ISO (the International Organization for Standardization) is a worldwide federation of

15、 national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. Int

16、ernational organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical c

17、ommittees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO4433-3 was prepared by Technical Committee ISO/TC138, Plastics pipes, fittings and valves for the transpo

18、rt of fluids, Subcommittee SC3, Plastics pipes and fittings for industrial applications. Together with the other parts (see below), this part of ISO4433 cancels and replaces ISO4433:1984, which has been technically revised. ISO4433 consists of the following parts, under the general title Thermoplast

19、ics pipesResistance to chemical fluidsClassification: Part 1: Immersion test method; Part 2: Polyolefin pipes; Part 3: Unplasticized poly(vinyl chloride) (PVC-U), high-impact poly(vinyl chloride) (PVC-HI) and chlorinated poly(vinyl chloride) (PVC-C) pipes; Part 4: Poly(vinylidene fluoride) (PVDF) pi

20、pes. Annex A of this part of ISO4433 is for information only. Descriptors: Pipes (tubes), thermoplastic resins, unplasticized polyvinyl chloride, plastic tubes, tests, determination, chemical resistance, classification.BSISO 4433-3:1997 BSI 04-1999 1 Introduction This part of ISO4433 gives a system

21、for preliminary classification of the chemical resistance of PVC-U, PVC-HI and PVC-C pipes. The method is based on the change in mass and changes in tensile properties resulting from immersion of test pieces, taken from the walls of PVC pipes, in the liquid to be conveyed, in the absence of pressure

22、. If the pipes are to be used under stress, for example for conveying liquids under pressure, the method only allows incompatibilities between the liquid and the material to be detected; a “satisfactory” or “limited” result needs to be confirmed by subsequent tests using ISO8584-11 and ISO/TR8584-22

23、. NOTE 1If pertinent to the proposed application, consideration should be given to whether particular liquids permeate the pipe wall. NOTE 2The possibility of a build-up of electrostatic charge in pipes during use should also be considered. 1 Scope The method of classification given in this part of

24、ISO4433 serves to determine the chemical resistance of unplasticized poly(vinyl chloride) (PVC-U), high-impact poly(vinyl chloride) (PVC-HI) and chlorinated poly(vinyl chloride) (PVC-C) pipes designed for the conveyance of liquids in the absence of pressure and stress (e.g. due to earth loads or tra

25、ffic loads, dynamic or internal stresses). To determine the chemical resistance, the method uses the change in mass and the changes in tensile properties which result from the immersion of test pieces, taken from such pipes, in liquid chemicals. The immersion test is carried out in accordance with I

26、SO4433-1. This part of ISO4433 is also applicable to PVC-U sheets as appropriate. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO4433. At the time of publication, the edition indicated was valid. All st

27、andards are subject to revision, and parties to agreements based on this part of ISO4433 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 4433-1

28、:1997, Thermoplastics pipes Resistance to liquid chemicalsClassification Part 1: Immersion test method. 3 Symbols The following symbols and definitions are used to designate the behaviour of pipes in contact with liquid chemicals: “S”: satisfactory resistance The pipes can be used for applications w

29、here there is no pressure or other stress; for applications where there is pressure, the final evaluation needs to be based on a subsequent test under pressure. “L”: limited resistance The pipes can be used for applications where there is no pressure or other stress, but a certain amount of change i

30、n properties due to the chemical can be accepted; for applications where there is pressure, the final evaluation needs to be based on a subsequent test under pressure. “NS”: non-satisfactory resistance The pipes are severely attacked: they are unsuitable for either pressure or non-pressure applicati

31、ons; there is no purpose in conducting tests under pressure as the results would certainly be unfavourable. 4 Principle The behaviour of a pipe material under the influence of the liquid to be conveyed is determined by immersion of test pieces, taken from the pipe wall, in the liquid at ambient pres

32、sure. Immersion tests in accordance with ISO4433-1 give changes in mass and tensile properties in comparison with non-immersed pieces. These changes depend, in general, on the immersion time and the immersion temperature. This part of ISO4433 establishes limits for permissible variations in properti

33、es at the test temperature in the absence of stress and classifies the measured performance by one of three designations (see clause3). 5 Determination of chemical resistance 5.1 Change in mass Determine the change in mass in accordance with ISO4433-1 by immersion tests. Calculate the percentage cha

34、nge in mass of each test piece using the equation %m m 2 m 1 m 1 - = 100 iv blankBSISO 4433-3:1997 BSI 04-1999 3 where Compare the arithmetic mean of the percentage change in mass at an immersion time of112days with the limits given inTable 1. Plot the values from all the different immersion times o

35、n the classification diagram shown inFigure 1. Plot as a function of the square root of the time. FromTable 1 andFigure 1, determine the classification of the pipe material on the basis of the change in mass. In particular, in the case of saturation (seeISO4433-1:1997, Annex B, curves No. 4 and No.7

36、) and if the immersion time is shorter than112days, use the diagrams with limit lines given inFigure 1 toFigure 4. If saturation or equilibrium is not reached after112days, classify the pipe material “NS”. 5.2 Change in elastic modulus Determine the change in elastic modulus by immersion testing in

37、accordance with ISO4433-1. Calculate the elastic modulus of each test piece using the equation given in ISO4433-1:1997, subclause 9.5. Calculate the mean percentage change Q Ein the elastic modulus using the following equation: where Compare the calculated Q Evalue at an immersion time of112 days wi

38、th the limits given inTable 2. Plot the Q Evalues from all the different immersion times on the classification diagram shown in Figure 2. Plot lg Q Eas a function of the lg of the immersion time. FromTable 2 andFigure 2, determine the classification of the pipe material on the basis of the change in

39、 elastic modulus. Table 1 Determination of chemical resistance from the mean percentage change in mass %m after112days immersion m 1 is the initial mass of the test piece before immersion; m 2 is the mass of the test piece after immersion. %m %m %m is the arithmetic mean of the elastic modulus befor

40、e immersion; is the arithmetic mean of the elastic modulus after immersion. Q E E M E 0 - =100 E 0 E M Pipe material Limits of the permissible values of % Satisfactory resistance S Limited resistance L Non-satisfactory resistance NS PVC-U 0,8 # # 3,6 3,6 $ 2 10$ 2 10$ 2 10 2 %m %m %m %m %m %m %m %m

41、%m %m %m %m %m %m %m %mBSISO 4433-3:1997 4 BSI 04-1999 Figure 1 Classification diagram for PVC-U, PVC-HI and PVC-C pipes based on change in massBSISO 4433-3:1997 BSI 04-1999 5 Table 2 Determination of chemical resistance from the mean percentage change in elastic modulus Q Eafter112days immersion 5.

42、3 Change in tensile strength at break Determine the change in tensile strength at break by immersion testing in accordance with ISO4433-1. Calculate the tensile strength at break of each test piece using the equation given in ISO4433-1:1997, subclause9.6. Calculate the mean percentage change Q tbin

43、the tensile strength at break using the following equation: where Compare the calculated Q tbvalue at an immersion time of112days with the limits given inTable 3. Plot the Q tbvalues from all the different immersion times on the classification diagram shown in Figure 3. Plot lg Q tbas a function of

44、the lg of the immersion time. FromTable 3 andFigure 3, determine the classification of the pipe material on the basis of the change in tensile strength at break. Pipe material Limits of the permissible values of Q E % Satisfactory resistance S Limited resistance L Non-satisfactory resistance NS PVC-

45、U Q E 83 83Q E 46 Q E83 83Q E 46 Q E83 83Q E 46 Q E 46 Figure 2 Classification diagram for PVC-U, PVC-HI and PVC-C pipes based on percentage change in elastic modulus Q tb tbM tb0 - = 100 is the arithmetic mean of the tensile strength at break before immersion; is the arithmetic mean of the tensile

46、strength at break after immersion. tb0 tbMBSISO 4433-3:1997 6 BSI 04-1999 Table 3 Determination of chemical resistance from the mean percentage change in tensile strength at break Q tbafter112days immersion 5.4 Change in elongation at break Determine the elongation at break by immersion testing in a

47、ccordance with ISO4433-1. Calculate the elongation at break of each test piece using the equation given in ISO4433-1:1997, subclause9.7. Calculate the mean percentage change Q bin the elongation at break using the following equation: where Compare the calculated Q bvalue at an immersion time of112da

48、ys with the limits given inTable 4. Plot the Q bvalues from all the different immersion times on the classification diagram shown in Figure 4. Plot lg Q bas a function of the lg of the immersion time. FromTable 4 andFigure 4, determine the classification of the pipe material on the basis of the chan

49、ge in elongation at break. Pipe material Limits of the permissible values of Q tb % Satisfactory resistance S Limited resistance L Non-satisfactory resistance NS PVC-U Q tb 80 80Q tb 46 Q tb80 80Q tb 46 Q tb80 80Q tb 46 Q tb 46 Figure 3 Classification diagram for PVC-U, PVC-HI and PVC-C pipes based on the percentage change in tensile strength at break is the arithmetic mean of the elongation at break before immersion; is the arithmetic mean of th