1、BS ISO24033:2009ICS 23.040.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPolyethylene of raisedtemperature resistance(PE-RT) pipes Effect of time andtemperature on theexpected strengthThis British Standardwas published under theauthority of the StandardsPoli
2、cy and StrategyCommittee on 28 February2009 BSI 2009ISBN 978 0 580 57516 7Amendments/corrigenda issued since publicationDate CommentsBS ISO 24033:2009National forewordThis British Standard is the UK implementation of ISO 24033:2009.The UK participation in its preparation was entrusted to TechnicalCo
3、mmittee PRI/88/4, Test methods.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard
4、 cannot confer immunityfrom legal obligations.BS ISO 24033:2009Reference numberISO 24033:2009(E)ISO 2009INTERNATIONAL STANDARD ISO24033Second edition2009-01-15Polyethylene of raised temperature resistance (PE-RT) pipes Effect of time and temperature on the expected strength Tubes en polythylne de me
5、illeure rsistance la temprature (PE-RT) Influence du temps et de la temprature sur la rsistance espre BS ISO 24033:2009ISO 24033:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited
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10、rightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedBS ISO 24033:2009ISO 24033:2009(E) ISO 2009 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The wo
11、rk 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. International organizations, governmental and non-governm
12、ental, 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The
13、main task of technical committees is to prepare International Standards. 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.
14、Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 24033 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
15、 transport of fluids, Subcommittee SC 5, General properties of pipes, fittings and valves of plastic materials and their accessories Test methods and basic specifications. This second edition cancels and replaces the first edition (ISO 24033:2006), which is extended to cover PE-RT materials, type II
16、, which have a higher hoop stress performance at higher temperatures than type I. The first edition dealt only with PE-RT materials, currently designated type I. BS ISO 24033:2009ISO 24033:2009(E) iv ISO 2009 All rights reservedIntroduction An increasing number of types of polyethylene (PE) polymers
17、, made in a variety of processes, is on the market for different applications in plastic piping and ducting systems. Many applications have their own system standard that defines the properties and requirements for the pipes and fittings used. The types of PE suitable for use in hot and cold water s
18、ystems are basically different from those for applications at ambient temperatures such as in water supply, sewage and drainage, and gaseous fuels. Therefore, it makes sense to differentiate those PE having raised temperature-resistance by terming them “PE-RT” (for polyethylene of raised temperature
19、)1). See the foreword for details of PE-RT materials, types I and II. 1) Abbreviated term based on the provisions of, and guidance for preparing new abbreviated terms for, basic polymers, mixtures of polymers, and related terms given in ISO 1043-11. BS ISO 24033:2009INTERNATIONAL STANDARD ISO 24033:
20、2009(E) ISO 2009 All rights reserved 1Polyethylene of raised temperature resistance (PE-RT) pipes Effect of time and temperature on the expected strength 1 Scope This International Standard specifies minimum values for expected strength as a function of time and temperature in the form of reference
21、lines, for use in calculations on pipes made of: a) polyethylene of raised temperature resistance (PE-RT) type I; b) PE-RT type II. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies.
22、For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 1: General method ISO 1167-2, Thermoplastics pipe
23、s, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 2: Preparation of pipe test pieces 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 reference line PE-RT pipes generic descriptio
24、n of the minimum long-term hydrostatic strength to be expected from a particular polymer NOTE 1 A reference line is not to be considered as characteristic of a specific grade or of material from a specific supplier. NOTE 2 A line is described by a mathematical equation, which permits interpolation a
25、nd extrapolation in an unambiguous way at various temperatures. NOTE 3 The reference lines for PE-RT have been agreed by a group of experts after considering experimental data, and have been accepted by the relevant ISO technical committees. BS ISO 24033:2009ISO 24033:2009(E) 2 ISO 2009 All rights r
26、eserved4 Basic equations The reference lines for PE-RT type I temperatures between 20 C and 95 C are described by Equations (1) and (2): Ig t = A1+ (B1/T) Ig + C1/T + D1Ig (1) lg t = A2+ (B2/T) Ig + C2/T + D2Ig (2where t is the time, in hours; T is the temperature, in kelvin; is the hoop stress, in
27、megapascals; A1= 190,481 A2= 23,795 4 B1= 58 219,035 B2= 1 723,318 C1= 78 763,07 C2= 11 150,56 D1= 119,877 D2= 0 The 110 C values have been determined separately using water inside and air outside the test specimen and have not been derived from Equations (1) and (2). The reference lines for PE-RT t
28、ype II for temperatures between 20 C and 110 C are described by Equation (3): lg t = A + (B/T) lg + C/T + D lg (3) where A = 219 B = 62600,752 C = 90 635,353 D = 126,387 NOTE ISO 90802quotes equations in a different sequence where C1= A, C2= C, C3= D and C4= B. 5 Expected strength 5.1 Extrapolation
29、limits The extrapolation limits (the end points of the reference lines) are based on an experimentally determined life at 110 C and an Arrhenius equation for the temperature dependence with an activation energy of 110 kJ/mol ( 26 kcal/mol). This yields the values given in Table 1 for the extrapolati
30、on factor, Kx(i.e. the expected lifetime at a given temperature divided by the lifetime at 110 C). BS ISO 24033:2009ISO 24033:2009(E) ISO 2009 All rights reserved 3Table 1 Extrapolation factors, KxTemperature Extrapolation factor T KxC 100 W T 95 2,5 95 W T 90 4 90 W T 85 6 85 W T 80 12 80 W T 75 18
31、 75 W T 70 30 T u 70 50 With a life of 1 year at 110 C, these values are therefore the number of years the pipes would be expected to last at each of the temperatures given. For temperatures up to and including 50 C, an extrapolation factor Kxof 100 is acceptable. 5.2 Graphical representation Figure
32、 1 and Figure 2 contain the reference lines corresponding to the values of the parameters given in Clause 4, to be used for demonstrating conformity to this specification, as specified in Annex A. The broken lines represent the extrapolation of the reference lines, applicable when longer failure tim
33、es are obtained at 110 C, extrapolation being permitted up to the limits given by the extrapolation factors in Table 1. 5.3 Tabulated values The calculated hoop strength values to be used for various temperatures and times are given in Table 2 and include no safety factors or design factors. The tim
34、es at 80 C, 90 C and 95 C not in brackets in the “Time” column in Table 2 are based on a lifetime of one year at 110 C. Proof of a longer lifetime at 110 C allows a corresponding extension of the times at lower temperatures. Such values are given in brackets in Table 2. BS ISO 24033:2009ISO 24033:20
35、09(E) 4 ISO 2009 All rights reservedTable 2 Expected hoop strength values for various values of time and temperature for PE-RT Temperature C Time a Expected strength MPa TemperatureC Time a Expected strength MPa Type I Type II Type I Type II 20 1 5 10 25 50 100 8,8 8,6 8,5 8,4 8,3 8,3 9,8 9,6 9,5 9,
36、4 9,3 9,3 70 1 5 10 25 50 5,1 4,8 4,8 4,7 4,1 5,4 5,3 5,2 5,1 5,1 30 1 5 10 25 50 100 8,1 7,9 7,8 7,7 7,6 7,6 8,9 8,7 8,6 8,5 8,5 8,4 80 1 5 10 18 (25) 4,3 4,2 3,8 3,4 (3,2) 4,6 4,5 4,4 4,3 (4,3) 40 1 5 10 25 50 100 7,3 7,2 7,1 7,0 6,9 6,8 8,0 7,8 7,8 7,7 7,6 7,5 90 1 4 6 (10) (15) 3,6 3,1 2,9 (2,6)
37、 (2,4) 3,8 3,7 3,6 (3,6) (3,6) 50 1 5 10 25 50 100 6,6 6,4 6,3 6,2 6,2 6,1 7,2 7,0 6,9 6,8 6,7 6,7 95 1 4 (6) (10) 3,2 2,6 (2,4) (2,1) 3,4 3,3 (3,3) (3,2) 60 1 5 10 25 50 5,8 5,7 5,6 5,5 5,4 6,3 6,1 6,1 6,0 5,9 BS ISO 24033:2009ISO 24033:2009(E) ISO 2009 All rights reserved 5Key X1t1time to fracture
38、, h X2t2time to fracture, a Y hoop stress, MPa Figure 1 Expected strength of PE-RT type I pipes BS ISO 24033:2009ISO 24033:2009(E) 6 ISO 2009 All rights reservedKey X1t1time to fracture, h X2t2time to fracture, a Y hoop stress, MPa Figure 2 Expected strength of PE-RT type II pipes BS ISO 24033:2009I
39、SO 24033:2009(E) ISO 2009 All rights reserved 7Annex A (normative) Demonstrating conformity of pipes to reference lines At each of the following temperatures, specimens shall be tested at each of the temperatures given; at least three failure times shall fall in each of the following time intervals:
40、 Temperatures: 20 C, 60 C to 82 C, 95 C and, for type II, 110 C NOTE 82 C is equivalent to 180F, commonly used as a test temperature in ASTM standards. Time intervals: 10 h to 100 h 100 h to 1000 h 1 000 h to 8760 h 8760 h In the case of tests lasting longer than 8 760 h, any test time after this va
41、lue may be considered as the failure time. Testing shall be carried out in accordance with ISO 1167-1 and ISO 1167-2. Conformity to reference lines shall be demonstrated by plotting the individual experimental results on the graph. At least 97,5 % of them shall lie on or above the reference lines gi
42、ven in either Figure 1 or Figure 2. For PE-RT type II materials, these experimental results shall not give any brittle failures indicating the presence of a knee at any temperature up to 110 C within 8 760 h. BS ISO 24033:2009ISO 24033:2009(E) 8 ISO 2009 All rights reservedBibliography 1 ISO 1043-1,
43、 Plastics Symbols and abbreviated terms Part 1: Basic polymers and their special characteristics 2 ISO 9080, Plastics piping and ducting systems Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation BS ISO 24033:2009BS ISO 24033:2009ISO 24033:2
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