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1、 Reference number ISO 24033:2009(E) ISO 2009 INTERNATIONAL STANDARD ISO 24033 Second edition 2009-01-15 Polyethylene of raised temperature resistance (PE-RT) pipes Effect of time and temperature on the expected strength Tubes en polythylne de meilleure rsistance la temprature (PE-RT) Influence du te
2、mps et de la temprature sur la rsistance espre Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 02/02/2009 22:23:53 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24033:200
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6、OPYRIGHT PROTECTED DOCUMENT ISO 2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address be
7、low or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reserved Copyright International Organization for Stand
8、ardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 02/02/2009 22:23:53 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24033:2009(E) ISO 2009 All rights reserved iii Foreword ISO (the International Organization for Standa
9、rdization) 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 been established has the right t
10、o 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 standardization. International Sta
11、ndards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The 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 In
12、ternational Standard requires approval by at least 75 % of the member bodies casting a vote. 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 2403
13、3 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the 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 rep
14、laces the first edition (ISO 24033:2006), which is extended to cover PE-RT materials, type II, 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. Copyright International Organization for Stan
15、dardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 02/02/2009 22:23:53 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24033:2009(E) iv ISO 2009 All rights reserved Introduction An increasing number of types of polyethyl
16、ene (PE) polymers, 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
17、 and cold water systems 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 r
18、aised temperature)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. Copyright International Organizat
19、ion for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 02/02/2009 22:23:53 MSTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 24033:2009(E) ISO 2009 All rights reserved 1 Polyethylene of raise
20、d 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 lines, for use in calculations on pipes made of: a) polyeth
21、ylene 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. For undated references, the latest edition of the reference
22、d 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 pipes, fittings and assemblies for the conveyance of fluids Det
23、ermination 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 description of the minimum long-term hydrostatic strength to be expec
24、ted 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 and extrapolation in an unambiguous way at various temperatu
25、res. 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. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitorin
26、g/1111111164 Not for Resale, 02/02/2009 22:23:53 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24033:2009(E) 2 ISO 2009 All rights reserved 4 Basic equations The reference lines for PE-RT type I temperatures between 20 C and 95 C are described by Equations (1) and (2)
27、: Ig t = A1 + (B1/T) Ig + C1/T + D1 Ig (1) lg t = A2 + (B2/T) Ig + C2/T + D2 Ig (2) where t is the time, in hours; T is the temperature, in kelvin; is the hoop stress, in 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
28、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 type 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
29、A = 219 B = 62 600,752 C = 90 635,353 D = 126,387 NOTE ISO 90802 quotes equations in a different sequence where C1 = A, C2 = C, C3 = D and C4 = B. 5 Expected strength 5.1 Extrapolation limits The extrapolation limits (the end points of the reference lines) are based on an experimentally determined l
30、ife 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 extrapolation factor, Kx (i.e. the expected lifetime at a given temperature divided by the lifetime at 110 C). Copyright Inter
31、national Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 02/02/2009 22:23:53 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24033:2009(E) ISO 2009 All rights reserved 3 Table 1 Extrapolation fact
32、ors, Kx Temperature Extrapolation factor T Kx C 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 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 temperatur
33、es up to and including 50 C, an extrapolation factor Kx of 100 is acceptable. 5.2 Graphical representation Figure 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
34、 Annex A. The broken lines represent the extrapolation of the reference lines, applicable when longer failure times 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
35、 for various temperatures and times are given in Table 2 and include no safety factors or design factors. The times 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 extensio
36、n of the times at lower temperatures. Such values are given in brackets in Table 2. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 02/02/2009 22:23:53 MSTNo reproduction or networking permitted without
37、 license from IHS -,-,- ISO 24033:2009(E) 4 ISO 2009 All rights reserved Table 2 Expected hoop strength values for various values of time and temperature for PE-RT Temperature C Time a Expected strength MPa Temperature C Time a Expected strength MPa Type I Type II Type I Type II 20 1 5 10 25 50 100
38、8,8 8,6 8,5 8,4 8,3 8,3 9,8 9,6 9,5 9,4 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,
39、5 90 1 4 6 (10) (15) 3,6 3,1 2,9 (2,6) (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 Copyright International Organization for Standardiz
40、ation Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 02/02/2009 22:23:53 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24033:2009(E) ISO 2009 All rights reserved 5 Key X1 t1 time to fracture, h X2 t2 time to fracture, a Y hoop
41、 stress, MPa Figure 1 Expected strength of PE-RT type I pipes Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 02/02/2009 22:23:53 MSTNo reproduction or networking permitted without license from IHS -,-,
42、- ISO 24033:2009(E) 6 ISO 2009 All rights reserved Key X1 t1 time to fracture, h X2 t2 time to fracture, a Y hoop stress, MPa Figure 2 Expected strength of PE-RT type II pipes Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/11111
43、11164 Not for Resale, 02/02/2009 22:23:53 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24033:2009(E) ISO 2009 All rights reserved 7 Annex A (normative) Demonstrating conformity of pipes to reference lines At each of the following temperatures, specimens shall be test
44、ed at each of the temperatures given; at least three failure times shall fall in each of the following time intervals: 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
45、100 h to 1 000 h 1 000 h to 8 760 h 8 760 h In the case of tests lasting longer than 8 760 h, any test time after this value 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 plotti
46、ng the individual experimental results on the graph. At least 97,5 % of them shall lie on or above the reference lines given 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 temperatur
47、e up to 110 C within 8 760 h. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=HP Monitoring/1111111164 Not for Resale, 02/02/2009 22:23:53 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 24033:2009(E) 8 ISO 2009 All rights reserved Bibliography 1 ISO 1043-1, 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 t
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