ISO 24033:2009 高温耐性のポリエチレン（PE-RT）パイプ—予想される強度に対する時間と温度の影響 | ページ 2

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 24033 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.

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 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.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

Bibliography