1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationDD ISO/TS 26873:2010Plastics pipes and fittings Definition and constructionprocedures for reference linesDD ISO/TS 26873:2010 DRAFT FOR DEVELOPMENTNational forewordThis Draft for
2、 Development is the UK implementation of ISO/TS26873:2010.This publication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publicationsand is of a provisional nature. It should be applied on thisprovisional basis, so that information and experien
3、ce of its practicalapplication can be obtained.Comments arising from the use of this Draft for Developmentare requested so that UK experience can be reported to theinternational organization responsible for its conversion toan international standard. A review of this publication willbe initiated not
4、 later than 3 years after its publication by theinternational organization so that a decision can be taken on itsstatus. Notification of the start of the review period will be made inan announcement in the appropriate issue of Update Standards.According to the replies received by the end of the revi
5、ew period,the responsible BSI Committee will decide whether to support theconversion into an international Standard, to extend the life of theTechnical Specification or to withdraw it. Comments should be sentto the Secretary of the responsible BSI Technical Committee at BritishStandards House, 389 C
6、hiswick High Road, London W4 4AL.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 n
7、ecessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 64291 3ICS 23.040.20; 23.040.45Compliance with a British Standard cannot confer immunity fromlegal obligations.This Draft for Development was published under the authority ofthe Standards Polic
8、y and Strategy Committee on 30 September 2010.Amendments issued since publicationDate Text affectedDD ISO/TS 26873:2010Reference numberISO/TS 26873:2010(E)ISO 2010TECHNICAL SPECIFICATION ISO/TS26873First edition2010-08-15Plastics pipes and fittings Definition and construction procedures for referenc
9、e lines Tubes et accessoires en plastiques Dfinition et procdure de construction des lignes de rfrence DD ISO/TS 26873:2010ISO/TS 26873:2010(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
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14、il copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedDD ISO/TS 26873:2010ISO/TS 26873:2010(E) ISO 2010 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bo
15、dies). 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. International organizations, governmental an
16、d 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 Standards are drafted in accordance with the rules given in the ISO/IEC Directives,
17、 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 International Standard requires approval by at least 75 % of the member bodies cas
18、ting a vote. In other circumstances, particularly when there is an urgent market requirement for such documents, a technical committee may decide to publish other types of document: an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in an ISO working
19、group and is accepted for publication if it is approved by more than 50 % of the members of the parent committee casting a vote; an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical committee and is accepted for publication if it is approved by 2/3 of th
20、e members of the committee casting a vote. An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is confirmed, it is reviewed again after a furt
21、her three years, at which time it must either be transformed into an International Standard or be withdrawn. 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
22、rights. ISO/TS 26873 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. DD ISO/TS 26873:
23、2010ISO/TS 26873:2010(E) iv ISO 2010 All rights reservedIntroduction This Technical Specification gives guidance to the construction of a stress rupture diagram, consisting of reference lines, giving the expected minimum required strength of plastics pipes under internal pressure as a function of ti
24、me and temperature. Such lines are used for the interpolation and extrapolation of stress rupture properties and for the application of Miners rule (see ISO 13760) in product standards (see Annex A). DD ISO/TS 26873:2010TECHNICAL SPECIFICATION ISO/TS 26873:2010(E) ISO 2010 All rights reserved 1Plast
25、ics pipes and fittings Definition and construction procedures for reference lines 1 Scope This Technical Specification defines reference lines as the generic representation of the creep rupture properties of pipes made of thermoplastics material and gives procedures for drafting reference lines in a
26、 mathematical form. 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 referenced document (including any amendments) applies. ISO 11
27、67-1, 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 Determination of the resistance to internal pressure Par
28、t 2: Preparation of pipe test pieces ISO 9080:, Plastics piping and ducting systems Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation1)3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1
29、 reference line mathematical description of the stress rupture properties of thermoplastics materials giving the expected hoop strength of the product with a certainty of at least 97,5 % when tested in accordance with ISO 1167-1 and ISO 1167-2 NOTE 1 Reference lines can be used for the calculation o
30、f design stress. They begin and end according to limits defined in ISO 9080. 1) Under preparation. DD ISO/TS 26873:2010ISO/TS 26873:2010(E) 2 ISO 2010 All rights reservedNOTE 2 Reference lines are defined using Equation (1): 1010 10loglog logiii iCtAB DTT=+ + + (1) where t is the expected time to fa
31、ilure, in hours; is the hoop stress, in megapascals; T is the temperature, in kelvins (C + 273,15); A, B, C, D are the parameters used in the model; i is 1 or 2, in the case of two separate branches (sometimes referred to as brittle and ductile). NOTE 3 Equation (1) is similar to ISO 9080:, Equation
32、 (A.1), but to avoid confusion, different symbols for the parameters have been used (A to D, instead of c1through c4). This notation is already in general use in several International Standards dealing with reference lines (see Annex A). NOTE 4 Examples of thermoplastics materials are PE, PB, PE-X,
33、PE-RT, PP, PVC-C, PVC-U, ABS and PVDF. 4 Procedures for drawing reference lines 4.1 General Depending on the available information, one of the following procedures shall be applied, taking into account the order in which these procedures are given. Lines generated according to these procedures shall
34、 not be used as reference lines until approved by ISO TC 138/SC 5. 4.2 Regression method Reference lines shall be based on the analysis of a set of data points as given in ISO 9080, which is considered representative of the product. Data for at least three temperatures, including 20 C and at least 1
35、0 K apart, shall be used. The regression (50 %) lines shall be shifted vertically until at least 97,5 % of the failure points are on or above the new line. The shift shall be equal at all temperatures. In the case of a knee found with ISO 9080, the amount of lowering shall be determined separately f
36、or each branch. 4.3 Constructed reference lines If ISO 9080 is not applicable, develop a 4-parameter model for each branch, in accordance with Equation (1). DD ISO/TS 26873:2010ISO/TS 26873:2010(E) ISO 2010 All rights reserved 3Annex A (informative) International Standards in which reference lines c
37、an be found Reference lines can be found in the following International Standards: a) ISO 3213 and ISO 15874-1, ISO 15874-2 and ISO 15874-3 for PP-H, PP-B, PP-R and PP-RCT; b) ISO 10146 and ISO 15875-1, ISO 15875-2, ISO 15875-3, ISO 15875-5 and ISO 15875-7 for PE-X; c) ISO 12230 and ISO 15876-1, ISO
38、 15876-2, ISO 15876-3, ISO 15876-5 and ISO 15876-7 for PB; d) ISO 15494 for PB, PE and PP; e) ISO 24033 and ISO 22391-1, ISO 22391-2, ISO 22391-3, ISO 22391-5 and ISO/TR 22391-7 for PE-RT; f) ISO 15877-1, ISO 15877-2 ISO 15877-3, ISO 15877-5 and ISO/TS 15877-7 for PVC-C; g) ISO 15493 for ABS, PVC-U,
39、 PVC-C; h) ISO 1452-1 for PVC-U; i) ISO 10931 for PVDF. DD ISO/TS 26873:2010ISO/TS 26873:2010(E) 4 ISO 2010 All rights reservedBibliography 1 ISO 1452-1, Plastics piping systems for water supply and for buried and above-ground drainage and sewerage under pressure Unplasticized poly(vinyl chloride) (
40、PVC-U) Part 1: General 2 ISO 3213, Polypropylene (PP) pipes Effect of time and temperature on the expected strength 3 ISO 10146, Crosslinked polyethylene (PE-X) pipes Effect of time and temperature on the expected strength 4 ISO 10931, Plastics piping systems for industrial applications Poly(vinylid
41、ene fluoride) (PVDF) Specifications for components and the system 5 ISO 12230, Polybutene (PB) pipes Effect of time and temperature on the expected strength 6 ISO 13760, Plastics pipes for the conveyance of fluids under pressure Miners rule Calculation method for cumulative damage 7 ISO 15493, Plast
42、ics piping systems for industrial applications Acrylonitrile-butadiene-styrene (ABS), unplasticized poly(vinyl chloride) (PVC-U) and chlorinated poly(vinyl chloride) (PVC-C) Specifications for components and the system Metric series 8 ISO 15494, Plastics piping systems for industrial applications Po
43、lybutene (PB), polyethylene (PE) and polypropylene (PP) Specifications for components and the system Metric series 9 ISO 15874-1, Plastics piping systems for hot and cold water installations Polypropylene (PP) Part 1: General 10 ISO 15874-2, Plastics piping systems for hot and cold water installatio
44、ns Polypropylene (PP) Part 2: Pipes 11 ISO 15874-3, Plastics piping systems for hot and cold water installations Polypropylene (PP) Part 3: Fittings 12 ISO 15875-1, Plastics piping systems for hot and cold water installations Crosslinked polyethylene (PE-X) Part 1: General 13 ISO 15875-2, Plastics p
45、iping systems for hot and cold water installations Crosslinked polyethylene (PE-X) Part 2: Pipes 14 ISO 15875-3, Plastics piping systems for hot and cold water installations Crosslinked polyethylene (PE-X) Part 3: Fittings 15 ISO 15875-5, Plastics piping systems for hot and cold water installations
46、Crosslinked polyethylene (PE-X) Part 5: Fitness for purpose of the system 16 ISO 15875-7, Plastics piping systems for hot and cold water installations Crosslinked polyethylene (PE-X) Part 7: Guidance for the assessment of conformity 17 ISO 15876-1, Plastics piping systems for hot and cold water inst
47、allations Polybutylene (PB) Part 1: General 18 ISO 15876-2, Plastics piping systems for hot and cold water installations Polybutylene (PB) Part 2: Pipes 19 ISO 15876-3, Plastics piping systems for hot and cold water installations Polybutylene (PB) Part 3: Fittings DD ISO/TS 26873:2010ISO/TS 26873:20
48、10(E) ISO 2010 All rights reserved 520 ISO 15876-5, Plastics piping systems for hot and cold water installations Polybutylene (PB) Part 5: Fitness for purpose of the system 21 ISO 15876-7, Plastics piping systems for hot and cold water installations Polybutylene (PB) Part 7: Guidance for the assessm
49、ent of conformity 22 ISO 15877-1, Plastics piping systems for hot and cold water installations Chlorinated poly(vinyl chloride) (PVC-C) Part 1: General 23 ISO 15877-2, Plastics piping systems for hot and cold water installations Chlorinated poly(vinyl chloride) (PVC-C) Part 2: Pipes 24 ISO 15877-3, Plastics piping systems for hot and cold water installations Chlorinated poly(vinyl
