ISO/TR 16913:1999 プラスチックパイプおよびフィッティング—テストの種類の定義 | 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, 3.

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.

In exceptional circumstances, when a technical committee has collected data of a different kind from that which is normally published as an International Standard ("state of the art", for example), it may decide by a simple majority vote of its participating members to publish a Technical Report. A Technical Report is entirely informative in nature and does not have to be reviewed until the data it provides are considered to be no longer valid or useful.

Attention is drawn to the possibility that some of the elements of ISO/TR 16913 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO/TR 16913 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.

Introduction

The need to define the test categories to which plastics pipes and fittings must be submitted has been felt for a long time.

At the beginning of the 80's, an Ad Hoc group was set up in order to examine this matter. At the time, it comprised Mr. Birkenfeld and Mr. De Putter from the Netherlands as well as Mr Verdin from France. The draft Guide 138-5 is the result of their work. It was put into circulation, with a view to voting and obtaining comments, from July 8, 1988 up until October 10, 1988 and was properly ratified. At this period in time, the SC 5 subcommittee was still the WG 5 Working Group, subjected to the arbitrary nature of the TC 138 Technical Committee.

This document contains two test definitions:

• product quality control test;
• fitness for use or type test;

which is decidedly insufficient and can lead to confusion.

Nevertheless, the authors were satisfied with their work and considered that there was nothing more to be done.

The CEN also showed interest in the matter and, under the convenorship of Mr Birkenfeld, drew up a very thorough text, perhaps too thorough, as it was complex and not very easy to manipulate, except, probably, for the initiated.

As, when they deliver comments, the delegates of the European countries refer to test categories which figure in the batch of definitions of 7"Assessment of conformity" of their system standards, the ISO/TC 138/SC 5 Secretariat considers it appropriate to communicate them to the ISO delegates in the form of a Technical Report and by way of information.

1 Scope

The purpose of this Technical Report is to supply a list of definitions, adopted at the CEN, for qualifying the different test categories which make it possible to pass judgment at different stages, from the production to the delivery of the products, on the properties of plastic pipes and fittings, as well as the corresponding abbreviations.

2 Definitions

The definitions of the test categories, as well as of other additional ones, are as follows:

Bibliography