ISO 15590-2:2021 石油および天然ガス産業—パイプライン輸送システム用の工場の曲げ、継手およびフランジ—パート2：継手 | 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.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives ).

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. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents ).

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html .

This document was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 2, Pipeline transportation systems.

This second edition cancels and replaces the first edition (ISO 15590-2:2003), which has been technically revised. The main changes compared to the previous edition are as follows:

• a) changed title;
• b) updated the list of applicable international standards with the latest applicable editions;
• c) added the possibility to execute NDE following the ISO, EN and ASTM standards;
• d) updated the assembly categories in only two types (sour service and non-sour service);
• e) removed references to extruded headers (they are not accessories but special products);
• f) modified the references to the final preparation, now in line with MSS SP-75 (Figure 1) and body conical according to the ASME B16.9 criteria (Figure 3);
• g) greater clarity on the sampling criteria (paragraph 9.2);
• h) reviewed the chemical analysis to align with the ISO 3183 requirements (additional notes concerning Pcm);
• i) updated applicable standards relating to HIC and SSC;
• j) modified paragraph relating to hydrotest;
• k) applicability lighter than caliber (applicable only to tees);
• l) added the range of qualifications of the “design proof test” in Clause B.5.

A list of all parts in the ISO 15590 series can be found on the ISO website.

Introduction

Further or differing requirements might be needed for individual applications. This document is not intended to inhibit a manufacturer from offering, or the purchaser from accepting, alternative equipment or engineering solutions for the individual application. This can be particularly applicable where there is innovative or developing technology. Where an alternative is offered, the manufacturer should identify any variations from this document and provide details.

1 Scope

This document specifies the technical delivery conditions for unalloyed or low-alloy steel seamless and welded pipeline fittings for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623.

This document is applicable to welding-end fittings such as elbows, caps, tees, single or multiple extruded headers, reducers, and transition sections made from seamless and welded pipe of unalloyed or low-alloy steels.

This document specifies two classes of fitting one related to material used in non-sour service and one for material to be use in sour service environment as shown in Table 1.

This document is not applicable to the selection of the fitting class.

This document is not applicable to the materials for, or the attachment of, factory-welded extensions.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 terms and definitions given in ISO 4885 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography