ISO/TS 11366:2011 石油および関連製品—蒸気、ガス、および複合サイクルタービン用の潤滑油のインサービスに関するガイダンス | 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.

In other circumstances, particularly when there is an urgent market requirement for such documents, a technical committee may decide to publish other types of normative document:

• an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in an ISO working group and is accepted for publication if it is approved by more than 50 % of the members of the parent committee casting a vote;
• an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting a vote.

An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an International Standard or be withdrawn.

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/TS 11366 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants, Subcommittee SC 4, Classifications and specifications.

This first edition of ISO/TS 11366 is derived from the IEC 60962. ISO/TC 28 was asked by IEC/TC 10, Fluids for electrotechnical applications, to adopt a technically revised version of IEC 60962, to which a consideration of gas and combined-cycle turbines has been added.

Introduction

The in-service monitoring of turbine oils is largely recognized by the power generation industry as necessary to ensure long and trouble-free operation of turbines.

There are three main types of stationary turbines used in power generation plants:

• a) steam turbines,
• b) gas turbines, and
• c) combined cycle turbines.

The combined cycle turbines are of two types:

• the first type, in which a gas turbine is associated with a steam turbine, with separated lubricating circuits;
• the second type, called single shaft combined cycle turbines, in which the steam and the gas turbines are on the same shaft and are lubricated with the same oil.

The lubrication requirements of gasturbines and steam turbines are quite similar, but there are some major differences. Gas-turbine oils are submitted to localized hot spots, and water contamination is less likely.

Gas-turbine oils have a shorter service life than steam-turbine oils. Steam-turbine oils have a much longer lifetime and experience is available with lifetimes from 10 to 20 years depending on the top-up level. The lifetime of gas-turbine oils generally does not exceed two years.

The values of the various characteristics mentioned in this Technical Specification are purely indicative. For proper interpretation of the results, account is taken of many factors, e.g. the type of equipment, the design of the lubricating oil circuit and the top-up level.

In all cases, the manufacturer's instructions are followed.

1 Scope

This Technical Specification applies to mineral oils used as lubricating oils and to control fluids used to lubricate steam, gas and combined cycle turbines in service. The lubricants considered in this Technical Specification are those classified in ISO 6743-5 and specified in ISO 8068.

This Technical Specification is intended to

• help power equipment operators evaluate the conditions of the oil in their equipment and maintain the oils in serviceable conditions;
• help users understand how the oils deteriorate and carry out a meaningful programme of sampling and testing of oils in use.

This Technical Specification also gives instructions with respect to the corrective actions that are taken to maximize service life.

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.

Bibliography