1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 12230:2012Polybutene-1 (PB-1) pipes Effect of time and temperatureon the expected strengthBS ISO 12230:2012 BRITISH STANDARDNational forewordThis British Standard is the U
2、K implementation of ISO 12230:2012.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/88/4, Test Methods - Plastic Piping.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the
3、 necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 74676 5ICS 23.040.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard
4、 was published under the authority of theStandards Policy and Strategy Committee on 31 August 2012.Amendments issued since publicationDate Text affectedBS ISO 12230:2012 ISO 2012Polybutene-1 (PB-1) pipes Effect of time and temperature on the expected strengthTubes en polybutne-1 (PB-1) Influence du
5、temps et de la temprature sur la rsistance espreINTERNATIONAL STANDARDISO12230Second edition2012-06-01Reference numberISO 12230:2012(E)BS ISO 12230:2012ISO 12230:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of thi
6、s 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 below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211
7、Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 12230:2012ISO 12230:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope 12 Normative references . 13 Terms and definitions . 14 Basic equations .
8、 24.1 General . 24.2 Polybutene homopolymer (PB-H) . 24.3 Polybutene random copolymer (PB-R) 25 Expected strength . 55.1 General . 55.2 Extrapolation limits . 55.3 Graphical representation . 55.4 Tabulated values 5Annex A (normative) Demonstrating conformance of pipes to the reference lines . 8Bibli
9、ography . 9BS ISO 12230:2012ISO 12230:2012(E)ForewordISO (the International 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 membe
10、r 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-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Elec
11、trotechnical 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 main task of technical committees is to prepare International Standards. Draft International Standards adopted
12、 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.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent r
13、ights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 12230 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 a
14、nd their accessories Test methods and basic specifications .This second edition cancels and replaces the first edition (ISO 12230:1996), which has been technically revised.iv ISO 2012 All rights reservedBS ISO 12230:2012ISO 12230:2012(E)IntroductionThe development of new polybutene-1 compounds based
15、 on random copolymers called PB-R means there is a need to rename the existing PB-1 homopolymer compounds PB-H. At the same time a new set of reference lines and tabulated expected hoop strength values for various times and temperatures needs to be included.The main changes since the previous editio
16、n of this International Standard are new definition of PB-1 compounds PB-H (homopolymer) and PB-R (copolymers), new set of reference lines (coefficients and diagram), new table containing calculated expected hoop strength values, recalculation of hoop strength data of PB-H and specifying values roun
17、ded down to one decimal place, clearer specification of showing conformance to reference lines, and conformance to reference lines can be shown by not failed data points running at sufficiently high hoop stress, too. ISO 2012 All rights reserved vBS ISO 12230:2012BS ISO 12230:2012Polybutene-1 (PB-1)
18、 pipes Effect of time and temperature on the expected strength1 ScopeThis International Standard specifies minimum values for the expected strength as a function of time and temperature in the form of reference lines and tabulated data, for use in calculations on pipes made of polybutene-1 homopolym
19、er (PB-H), and polybutene-1 random copolymer (PB-R).For the sake of simplicity the designation polybutene and the abbreviation PB are used throughout.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the editio
20、n cited applies. 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 methodISO 1167-2, Ther
21、moplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 2: Preparation of pipe test pieces3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1reference lineminimum long-term hy
22、drostatic strength to be expected from a particular polymerNOTE 1 Reference lines are not to be considered as characteristic of a specific grade or of material from a specific supplier.NOTE 2 The lines are described by a mathematical equation which permits interpolation and extrapolation in an unamb
23、iguous way at various temperatures.NOTE 3 The reference lines for polybutene (PB) have been agreed upon by a group of experts after considering experimental data, and have been accepted by the relevant technical committees in ISO.3.2polybutene-1 homopolymerPB-Hcompound prepared by polymerization of
24、no less than 95 % butene-1 by weight3.3polybutene-1 random copolymer PB-Rcompound prepared by polymerization of no less than 85 % butene-1 and no less than 95 % of total olefins by weightINTERNATIONAL STANDARD ISO 12230:2012(E) ISO 2012 All rights reserved 1BS ISO 12230:2012ISO 12230:2012(E)4 Basic
25、equations4.1 GeneralThe reference lines are based on the four-parameter model and are described by the following equations:First branch: lg t = A1+ (B1/T)lg + C1/T + D1lg (1)Second branch: lg t = A2+ (B2/T)lg + C2/T + D2lg (2)wheret is the time, in hours;T is the temperature, in kelvins; is the hoop
26、 stress, in megapascals.The lower value obtained from Equation (1) or Equation (2), respectively, represents the expected minimum hoop strength.4.2 Polybutene homopolymer (PB-H)The following coefficients are valid for the reference lines of PB-H in the temperature range between 10 C and 110 C:A1= 43
27、0,866 A2= 129,895B1= 125 010 B2= 37 262,7C1= 173 892,7 C2= 52 556,48D1= 290,056 9 D2= 88,567 35Figure 1 represents the reference lines calculated with the above coefficients in graphical form.4.3 Polybutene random copolymer (PB-R)The following coefficients are valid for the reference lines of PB-R i
28、n the temperature range between 10 C and 95 C:A1= 367,801 9B1= 104 096,6C1= 145 940,231D1= 245,538 6The line at 110 C has been determined separately and is only used for obtaining the extrapolation time limits.2 ISO 2012 All rights reservedBS ISO 12230:2012ISO 12230:2012(E)1 10 100 1 000 10 000 100
29、000 1 000 0001254376109820304050Years15 10 25 50 10040 C30 C20 C10 C50 C60 C70 C80 C90 C110 C95 CYXKeyY hoop stress (MPa)X time (h)Figure 1 Expected strength of polybutene homopolymer (PB-H) pipes ISO 2012 All rights reserved 3BS ISO 12230:2012ISO 12230:2012(E)1 10 100 1 000 10 000 100 000 1 000 000
30、125437610982030405010 C20 C30 C 40 C 50 C 60 C 70 C 80 C 90 C 110 C 95 C Years15 10 25 50 100YXKeyY hoop stress (MPa)X time (h)Figure 2 Expected strength of polybutene random copolymer (PB-R) pipes4 ISO 2012 All rights reservedBS ISO 12230:2012ISO 12230:2012(E)5 Expected strength5.1 GeneralPrior to
31、testing, pipes prepared from PB-H and PB-R compounds shall be conditioned in accordance with recommendations obtained from the manufacturer.Pipes prepared from PB-R compounds shall be annealed for 96 h at 95 C prior to thermal stability testing at 110 C.5.2 Extrapolation limitsThe extrapolation limi
32、ts (the end points of the reference lines) are based on an experimentally determined life at 110 C for PB-H and for PB-R, respectively, and an Arrhenius equation for the temperature dependence with an activation energy of 110 kJ/mole ( 26 kcal/mole). This yields the values given in Table 1 for the e
33、xtrapolation factor kx(i.e. the expected lifetime at a given temperature divided by the lifetime at 110 C for PB-H and for PB-R).Table 1 Extrapolation time factors for PB-H and PB-RkxT C2,5 100 T 954 95 T 906 90 T 8510 85 T 8018 80 T 7530 75 T 7050 T 70With a life of one year at 110 C, these values
34、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.5.3 Graphical representationFigures 1 and 2 contain the reference lines for PB-H and PB-R, respectively, c
35、orresponding to the values of the parameters given in this clause, which shall be used for demonstrating conformance to this specification in accordance with Annex A.The broken lines represent the extrapolation of the reference lines, applicable when longer failure times are obtained at 110 C, extra
36、polation being permitted up to the limits given by the extrapolation factors in Table 1.5.4 Tabulated valuesThe calculated hoop strength values to be used for various temperatures and times are given in Table 2 for PB-H and Table 3 for PB-R and do not include design factors.The times at 80 C, 90 C a
37、nd 95 C not in brackets in the “time” column in Table 2 for PB-H and Table 3 for PB-R 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 Tables 2 and 3. ISO 2012 A
38、ll rights reserved 5BS ISO 12230:2012ISO 12230:2012(E)Table 2 Expected hoop strength values of PB-H pipes for various values of time and temperatureTemperatureCTimeyearsExpected strengthMPaTemperatureCTimeyearsExpected strengthMPa201 5 10 25 50 10014,5 14,3 14,2 13,9 13,6 13,4701 5 10 25 509,2 8,5 8
39、,2 7,8 7,6301 5 10 25 50 10013,6 13,4 13,2 12,9 12,6 12,3801 5 10 18 (25)7,6 6,9 6,7 6,4 (6,3)401 5 10 25 50 10012,7 12,4 12,1 11,8 11,5 11,2901 4 6 (10) (15)5,9 5,4 5,2 (5,0) (4,9)501 5 10 25 50 10011,6 11,2 10,9 10,6 10,3 10,0951 4 (6) (10)5,1 4,5 (4,4) (4,2)601 5 10 25 5010,5 9,9 9,6 9,2 9,06 ISO
40、 2012 All rights reservedBS ISO 12230:2012ISO 12230:2012(E)Table 3 Expected hoop strength values of PB-R pipes for various values of time and temperatureTemperatureCTimeyearsExpected strengthMPaTemperatureCTimeyearsExpected strengthMPa201 5 10 25 50 10014,1 13,9 13,8 13,7 13,6 13,5701 5 10 25 508,4
41、8,2 8,1 8,0 7,9301 5 10 25 50 10013,2 13,0 12,9 12,7 12,7 12,6801 5 10 18 (25)6,9 6,7 6,6 6,5 (6,5)401 5 10 25 50 10012,1 11,9 11,8 11,7 11,6 11,5901 4 6 (10) (15)5,4 5,2 5,1 (5,1) (5,0)501 5 10 25 50 10011,0 10,8 10,7 10,6 10,5 10,4951 4 (6) (10)4,6 4,4 (4,4) (4,3)601 5 10 25 509,8 9,5 9,4 9,3 9,2
42、ISO 2012 All rights reserved 7BS ISO 12230:2012ISO 12230:2012(E)Annex A (normative) Demonstrating conformance of pipes to the reference linesAt each of the following temperatures, specimens shall be tested at various hoop stresses such that, at each of the temperatures given, at least three failure
43、times fall in each of the following time intervals:Temperatures: 20 C, 60 C to 82 C, 95 CTime intervals: 10 h to 100 h100 h to 1 000 h1 000 h to 8 760 h 8 760 hIn accordance with ISO 9080 failure points at 20 C up to 1,000 h may be neglected.If there are difficulties obtaining failures in some of th
44、e time intervals any running data point above the reference line can be accepted as showing conformance to the reference line.For tests lasting longer than 8 760 h without failure, the actual test time can be considered as the failure time, provided it is on or above the reference line.Testing shall
45、 be carried out in accordance with ISO 1167-1 and ISO 1167-2.Conformance to the 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.8 ISO 2012 All rights reservedBS ISO 12230:2012ISO 122
46、30:2012(E)Bibliography1 ISO 9080, Plastics piping and ducting systems Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation ISO 2012 All rights reserved 9BS ISO 12230:2012ISO 12230:2012(E) ISO 2012 All rights reservedICS 23.040.20Price based on
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