1、BRITISH STANDARD BS ISO 4433-2:1997 BS 2782-11: Method 1161B:1998 Thermoplastics pipes Resistance to liquid chemicals Classification Part 2: Polyolefin pipes ICS 23.040.20BSISO4433-2:1997 This British Standard, having been prepared under the directionof the Sector Board forMaterials and Chemicals, w
2、aspublished under the authorityof the Standards Boardand comes into effect on 15March1998 BSI 04-1999 ISBN 0 580 29137 5 National foreword This British Standard reproduces verbatim ISO4433-2:1997 and implements it as the UK national standard. This international standard is incorporated into BS2782,
3、Methods of testing plastics: Part 11: Thermoplastics pipes, fittings and valves, as Method 1161B, for association with related test methods for plastics materials and plastics piping components. The UK participation in its preparation was entrusted to Technical Committee PRI/61, Plastics piping syst
4、ems and components, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developm
5、ents 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 implement international or European publications referred to in this document may be found in the BSI Standards Catalogu
6、e under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. WARNING NOTE. This British Standard, which is identical with ISO4433-2:1997, does not necessarily detail all the precautions necessary to meet the r
7、equirements 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 personnel. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards
8、 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 comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 10 and a back co
9、ver. 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 cover. Amendments issued since publication Amd. No. Date CommentsBSISO4433-2:1997 BSI 04-1999 i Contents Page National foreword Inside
10、front cover Foreword iii Text of ISO 4433-2 1ii blankBSISO4433-2:1997 ii BSI 04-1999 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Normative reference 1 3 Symbols 1 4 Principle 1 5 Determination of chemical resistance 1 6 Classification of the chemical resistance 9 7 Test report 9 Annex A (i
11、nformative) Bibliography 10 Figure 1 Classification diagram for polyolefin pipes based on changein mass 3 Figure 2 Classification diagram for polyolefin pipes based on percentage change in elastic modulus 4 Figure 3 Classification diagram for polyolefin pipes based on the percentage change in tensil
12、e strength at yield 5 Figure 4 Classification diagram for polyolefin pipes based on the percentage change in tensile strength at break 6 Figure 5 Classification diagram for polyolefin pipes based on the percentage change in elongation at yield point 7 Figure 6 Classification diagram for polyolefin p
13、ipes based on the percentage change in elongation at break 9 Table 1 Determination of chemical resistance from the mean percentage change in mass %m after 112 days9 immersion 2 Table 2 Determination of chemical resistance from the mean percentage change in elastic modulus Q Eafter 112 days9 immersio
14、n 4 Table 3 Determination of chemical resistance from the mean percentage change in tensile strength at yield Q tyafter 112 days9 immersion 5 Table 4 Determination of chemical resistance from the mean percentage change in tensile strength at break Q tbafter 112 days9 immersion 6 Table 5 Determinatio
15、n of chemical resistance from the mean percentage change in elongation at yield Q yafter 112 days9 immersion 7 Table 6 Determination of chemical resistance from the mean percentage change in elongation at break Q bafter 112 days9 immersion 8BSISO4433-2:1997 BSI 04-1999 iii Foreword ISO (the Internat
16、ional Organization for Standardization) is a worldwide federation of 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 bee
17、n established has the right to be represented on that committee. International 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 stand
18、ardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75% of the member bodies casting a vote. International Standard ISO4433-2 was prepared by Technical Com
19、mittee ISO/TC138, Plastics pipes, fittings and valves for the transport 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
20、 consists of the following parts, under the general title Thermoplastics pipes Resistance to chemical fluids Classification: Part 1: Immersion test method; Part 2: Polyolefin pipes; Part 3: Unplasticized poly(vinyl chloride) (PVC-U), high-impact poly (vinylchloride) (PVC-HI) and chlorinated poly(vin
21、yl chloride) (PVC-C) pipes; Part 4: Poly(vinylidene fluoride) (PVDF) pipes. Annex A of this part of ISO4433 is for information only. Descriptors: Pipes (tubes), thermoplastic resins, polyolefins, plastic tubes, tests, determination, chemical resistance, classification.iv blankBSISO4433-2:1997 BSI 04
22、-1999 1 Introduction This part of ISO4433 gives a system for preliminary classification of the chemical resistance of polyolefin 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 polyolefin pipes, in th
23、e liquid to be conveyed, in the absence of pressure. 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
24、subsequent tests using ISO8584-11 (seeAnnex A). 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 m
25、ethod of classification given in this part of ISO4433 serves to determine the chemical resistance of polyolefin pipes designed for the conveyance of liquids in the absence of pressure and stress (e.g. due to earth loads or traffic loads, dynamic or internal stresses). To determine the chemical resis
26、tance, 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 ISO4433-1. This part of ISO4433 is also applicable to polyolefin sheets as
27、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 standards are subject to revision, and parties to agreements based on t
28、his 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 4433-1:1997, Thermoplastics pipes Resistance to liquid chemicals Classifica
29、tion Part 1: Immersion test method. 3 Symbols The following symbols are used to designate the behaviour of pipes in contact with liquid chemicals: “S”: satisfactory resistance The pipes can be used for applications where there is no pressure or other stress; for applications where there is pressure,
30、 the final evaluation needs to be on the basis of 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 in properties due to the chemical can be accepted; for applications where ther
31、e 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 applications; there is no purpose in conducting tests under pressure as the results wo
32、uld 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 pressure. Immersion tests in accordance with ISO4433-1 give changes in mass and t
33、ensile 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 properties at the test temperature in the absence of stress and classifies the measur
34、ed performance by one of three designations (seeclause3). 5 Determination of chemical resistance 5.1 Change in mass Determine the change in mass by immersion testing in accordance with ISO4433-1. Calculate the percentage change in mass of each test piece using the equation where m 1 is the initial m
35、ass of the test piece before immersion: m 2 is the mass of the test piece after immersion. %m m 2 m 1 m 1 -100 =BSISO4433-2:1997 2 BSI 04-1999 Compare the arithmetic mean of the percentage change in mass at an immersion time of112 days with the limits given inTable 1. Plot the values from all the di
36、fferent immersion times on the classification diagram shown in Figure 1. Plot as a function of the square root of the time. FromTable 1andFigure 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, Annex B, c
37、urves No.4 and No.7) and if the immersion time is shorter than112 days, use the diagrams with limit lines given in Figure 1 toFigure 6. If saturation or equilibrium is not reached after 112 days, classify the pipe material“NS”. Table 1 Determination of chemical resistance from the mean percentage ch
38、ange in mass %m after 112 days9 9 immersion %m %m %m Pipe material Limits of the permissible values of % Satisfactory resistance S Limited resistance L Non-satisfactory resistance NS PE (LD, HD, MD) PP PB a a a PE-X a Proposal %m2 #%m #10 10%m $5 %m 15 %m 5 $5 %m 15 %m 5 $5 %m 15 %m 5 $5 %m 15 %m 5
39、BSISO4433-2:1997 BSI 04-1999 3 Figure 1 Classification diagram for polyolefin pipes based on change in massBSISO4433-2:1997 4 BSI 04-1999 5.2 Change in elastic modulus Determine the change in elastic modulus by immersion testing in accordance with ISO4433-1. Calculate the elastic modulus of each tes
40、t piece using the equation given in ISO4433-1, subclause9.5. Calculate the mean percentage change Q Ein the elastic modulus using the following equation: where Compare the calculated Q Evalue at an immersion time of112days with the limits given inTable 2. Plot the Q Evalues from all the different im
41、mersion times in the classification diagram shown in Figure 2. Plot lg Q Eas a function of the lg of the immersion time. FromTable 2andFigure 2, determine the classification of the pipe material on the basis of the change in elastic modulus. Table 2 Determination of chemical resistance from the mean
42、 percentage change in elastic modulus Q Eafter 112 days immersion is the arithmetic mean of the elastic modulus before immersion; Q E E M E 0 -100 = E 0 is the arithmetic mean of the elastic modulus after immersion. E M Pipe material Limits of the permissible values of Q E % Satisfactory resistance
43、S Limited resistance L Non-satisfactory resistance NS PE (LD, HD, MD) Q E $38 38 Q E $31 Q E Q E $31 Q E 31 PB Q E $38 a 38 Q E $31 a Q E Q E$ 31 Q E 31 a Proposal Figure 2 Classification diagram for polyolefin pipes based on percentage change in elasticmodulusBSISO4433-2:1997 BSI 04-1999 5 5.3 Chan
44、ge in tensile strength at yield Determine the change in tensile strength at yield by immersion testing in accordance with ISO4433-1. Calculate the tensile strength at yield of each test piece using the equation given in ISO4433-1, subclause 9.6. Calculate the mean percentage change Q tyin the tensil
45、e strength at yield using the following equation: where Compare the calculated Q tyvalue at an immersion time of 112 days with the limits given inTable 3. Plot the Q tyvalues from all the different immersion times on the classification diagram shown in Figure 3. Plot lg Q tyas a function of the lg o
46、f the immersion time. FromTable 3andFigure 3, determine the classification of the pipe material on the basis of the change in tensile strength at yield. Table 3 Determination of chemical resistance from the mean percentage change in tensile strength at yield Q tyafter 112 days9 9 immersion Q ty B ty
47、M B ty0 -100 = is the arithmetic mean of the tensile strength at yield before immersion; is the arithmetic mean of the tensile strength at yield after immersion. B ty0 B tyM Pipe material Limits of the permissible values of Q ty % Satisfactory resistance S Limited resistance L Non-satisfactory resis
48、tance NS PE (LD, HD, MD) Q ty $80 80 Q ty $46 Q tyQ ty $46 Q tyQ ty $46 a Q tyQ ty $46 Q ty 46 a Proposal Figure 3 Classification diagram for polyolefin pipes based on the percentage change in tensile strength at yieldBSISO4433-2:1997 6 BSI 04-1999 5.4 Change in tensile strength at break Determine t
49、he 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, subclause 9.6. Calculate the mean percentage change Q tbin the tensile strength at break using the following equation: where Compare the calculated Q tbvalue at an immersion time of 112 days with the limits given inTable 4. Plot the Q tbvalues from all the
