National foreword

This British Standard is the UK implementation of ISO 3977‑2:2023. It supersedes BS ISO 3977‑2:1997, which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee MCE/16, Gas turbines.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2023.

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 192, Gas turbines.

This second edition cancels and replaces the first edition (ISO 3977‑2:1997), which has been technically revised.

The main changes are as follows:

revisions to text (clarifications).

A list of all parts in the ISO 3977 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Introduction

This is a procurement International Standard developed for gas turbines reference conditions and ratings.

1 Scope

This document specifies the standard reference conditions and ISO standard ratings for gas turbines.

2 Normative references

3 Terms and definitions

4 Standard reference conditions

4.1 General

4.2 Air intake conditions

4.3 Exhaust conditions

4.4 Cooling water conditions (if applicable)

4.5 Working fluid heater or cooler

5 Ratings

5.1 General

5.2 Power ratings

5.3 ISO standard ratings

5.4 Site ratings

BS ISO 3977-2:2023

Gas turbines. Procurement - Standard reference conditions and ratings

Current

Published:

31 Mar 2023

1 Scope