Plaströrsystem Rör av polyeten med förhöjd temperaturbeständighet (PE-RT) Inverkan av tid och temperatur på förväntad livslängd (ISO 24033:2009, IDT)

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1 SVENSK STANDARD SS-ISO 24033:2009 Fastställd/Approved: Publicerad/Published: Utgåva/Edition: 2 Språk/Language: engelska/english ICS: Plaströrsystem Rör av polyeten med förhöjd temperaturbeständighet (PE-RT) Inverkan av tid och temperatur på förväntad livslängd (ISO 24033:2009, IDT) Polyethylene of raised temperature resistance (PE-RT) pipes Effect of time and temperature on the expected strength (ISO 24033:2009, IDT) SWEDISH STANDARDS INSTITUTE

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3 Den internationella standarden ISO 24033:2009 gäller som svensk standard. Detta dokument innehåller den Denna standard ersätter SS-ISO 24033:2006, utgåva 1. This standard supersedes the Swedish Standard SS-ISO 24033:2006, edition 1. Copyright/Upphovsrätten till denna produkt tillhör SIS, Swedish Standards Institute, Stockholm, Sverige. Användningen av denna produkt regleras av slutanvändarlicensen som återfinns i denna produkt, se standardens sista sidor. Copyright SIS, Swedish Standards Institute, Stockholm, Sweden. All rights reserved. The use of this product is governed by!the end-user licence for this product. You will find the licence in the end of this document. Upplysningar om sakinnehållet i standarden lämnas av SIS, Swedish Standards Institute, telefon Standarder kan beställas hos SIS Förlag AB som även lämnar allmänna upplysningar om svensk och utländsk standard. Information about the content of the standard is available from the Swedish Standards Institute (SIS), tel Standards may be ordered from SIS Förlag AB, who can also provide general information about Swedish and foreign standards. SIS Förlag AB, SE Stockholm, Sweden. Tel: Fax: sis.sales@sis.se Internet:

4 SS-ISO 24033:2009 (E) ISO 24033:2009(E) Foreword ISO (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 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-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, 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 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 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 replaces 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. iii ISO 2009 All rights reserved iii

5 ISO 24033:2009(E) SS-ISO 24033:2009 (E) Introduction An increasing number of types of polyethylene (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 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 raised 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 [1]. iv ISO 2009 All rights reserved iv

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7 INTERNATIONAL STANDARD SS-ISO 24033:2009 (E) ISO 24033:2009(E) Polyethylene 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 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. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO , Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 1: General method ISO , Thermoplastics pipes, 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 description of the minimum long-term hydrostatic strength to be expected from a particular polymer NOTE 1 supplier. A reference line is not to be considered as characteristic of a specific grade or of material from a specific NOTE 2 A line is described by a mathematical equation, which permits interpolation and 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. ISO 2009 All rights reserved 1

8 SS-ISO 24033:2009(E) (E) 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): where Ig t A 1 (B 1 /T) Ig C 1 /T D 1 Ig (1) lg t A 2 (B 2 /T) Ig C 2 /T D 2 Ig (2) t T is the time, in hours; is the temperature, in kelvin; is the hoop stress, in megapascals; A 1 190,481 A 2 23,795 4 B ,035 B ,318 C ,07 C ,56 D 1 119,877 D 2 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 type II for temperatures between 20 C and 110 C are described by Equation (3): where lg t A (B/T) lg C/T D lg (3) A 219 B ,752 C ,353 D 126,387 NOTE ISO 9080 [2] quotes equations in a different sequence where C 1 A, C 2 C, C 3 D and C 4 B. 5 Expected strength 5.1 Extrapolation 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 extrapolation factor, K x (i.e. the expected lifetime at a given temperature divided by the lifetime at 110 C). 2 ISO 2009 All rights reserved