1、BRITISH STANDARD BS EN 60953-3:2002 IEC 60953-3:2001 Rules for steam turbine thermal acceptance tests Part 3: Thermal performance verification tests of retrofitted steam turbines The European Standard EN 60953-3:2002 has the status of a British Standard ICS 27.040 NO COPYING WITHOUT BSI PERMISSION E
2、XCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 60953-3:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 14 May 2002 BSI 14 May 2002 ISBN 0 580 39
3、481 6 National foreword This British Standard is the official English language version of EN 60953-3:2002. It is identical with IEC 60953-3:2001. The UK participation in its preparation was entrusted to Technical Committee MCE/13, Steam turbines, which has the responsibility to: A list of organizati
4、ons represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to
5、the other, publications may contain identifiers from both systems. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence
6、 Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itse
7、lf confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them
8、 in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 80, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd.
9、No. Date CommentsEUROPEAN STANDARD EN 60953-3 NORME EUROPENNE EUROPISCHE NORM January 2002 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 105
10、0 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60953-3:2002 E ICS 27.040 English version Rules for steam turbine thermal acceptance tests Part 3: Thermal performance verification tests of retrofitted steam turbine
11、s (IEC 60953-3:2001) Rgles pour les essais thermiques de rception des turbines vapeur Partie 3: Essais de vrification des performances des turbines vapeur rnoves (CEI 60953-3:2001) Regeln fr thermische Abnahmeprfungen fr Dampfturbinen Teil 3: Thermische Leistungsangabenberprfung fr modernisierte Dam
12、pfturbinen (IEC 60953-3:2001) This European Standard was approved by CENELEC on 2001-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-d
13、ate lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation unde
14、r the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, I
15、reland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN 65903-:30022 - 2 - Foreword The text of document 5/130/FDIS, future edition 1 of IEC 60953-3, prepared by IEC TC 5, Steam turbines, was submitted to the IEC-CENELEC parallel vote and was
16、 approved by CENELEC as EN 60953-3 on 2001-10-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2002-08-01 latest date by which the national standards conflicting with the E
17、N have to be withdrawn (dow) 2004-10-01 This European Standard should be read in conjunction with EN 60953-2. Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annexes H, K and ZA are normative and
18、annexes I, J and L are informative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60953-3:2001 was approved by CENELEC as a European Standard without any modification. _ Page2 EN609533:2002 BSI14May2002Page 3 EN 60953-3:2002 BSI 14 May 2002 CONTE
19、NTS INTRODUCTION.4 1 Scope and object7 2 Units, symbols, terms and definitions8 3 Guiding principles.16 4 Measuring techniques and measuring instruments18 5 Evaluation of tests20 6 Corrections of test results and comparison with guarantee .25 Annexes A to G are given in IEC 60953-2 Annex H (normativ
20、e) Measuring uncertainty of results retrofit application 27 Annex I (informative) Retrofit improvement calculation numerical examples (fossil and nuclear) .33 Annex J (informative) Uncertainty calculation numerical examples (fossil and nuclear) 59 Annex K (normative) Tracer technique retrofit applic
21、ation 70 Annex L (informative) Temperature variation method 74 Annex ZA (normative) Normative references to international publications with their corresponding European Publications 80Page 4 EN 60953-3:2002 BSI 14 May 2002 INTRODUCTION Retrofitting steam turbines in an existing power plant frequentl
22、y involves an improvement of performance. IEC 60953-1 and IEC 60953-2, which define the rules for steam turbine thermal acceptance tests of a new power plant, do not cater for all the requirements specific to retrofit projects. It has, therefore, been deemed necessary to draw up a supplementary retr
23、ofit code (RC) for guidance on the thermal acceptance tests of retrofitted steam turbines. However, a large number of the provisions and recommendations of IEC 60953-1 and IEC 60953-2 are still applicable to retrofits and, therefore, in order to avoid a repetitive and bulky document, only the retrof
24、it-specific addenda will be found in this RC. This part of IEC 60953 shall be read in conjunction with IEC 60953-2, and the words verification test should be read in place of acceptance test. IEC 60953-2 is taken as a RS. The structure and clause numbering of this standard follow that of IEC 60953-2
25、. Subclauses found in this standard supersede the whole of the equivalent subclause in the RS. Subclause numbering has been extended whenever new items have been included the numbering following on chronologically. The subclauses of the RS requiring no amendment have not been repeated here. IEC 6095
26、3-2 has been used as reference rather than IEC 60953-1 since it is more versatile and appropriate to retrofits. Although this standard is intended to apply to the retrofit of large condensing steam turbines, it can nevertheless be used for other types and sizes of turbines to define the bases of a s
27、pecific procedure to be agreed upon by the parties involved. The fact that IEC 60953-2 has been given preference over IEC 60953-1 does not mean that a less accurate option has been taken. The rules it contains are defined so as to obtain the appropriate testing accuracy for the retrofit project and
28、for the relevant type of guarantee. In some cases, the more stringent rules of IEC 60953-1 are needed to meet these objectives and this is indicated in this standard. The rules given in this standard cover all hardware change in the steam turbine equipment. Changes to other hardware components (e.g.
29、 boiler, feedwater heaters, etc.) are not covered by this code although these changes may affect the thermodynamic cycle. The purpose of this RC is to cover the retrofit of steam turbine components which influence the efficiency of the power plant and are subject to a performance guarantee. Many dif
30、ferent situations are likely to be encountered: for example, the replacement of steam valves, the replacement of part of the turbine blading, of a rotor, of a complete module, etc. The guarantee values will depend on the retrofit considered and are subject to agreement between the parties involved i
31、n the contract. This standard helps the parties determine the most appropriate parameters that characterise the retrofit and that could be used as guaranteed values. A major difficulty in retrofit projects is the choice of parameters to be guaranteed. Although the original manufacturer will generall
32、y favour a relative improvement guarantee, another vendor who does not necessarily know all the details of the equipment installed may prefer to have an absolute guarantee value for the retrofitted equipment. This standard gives guidance on the parameters to be guaranteed . Once the guaranteed value
33、s are established, they may need to be re-evaluated after a pre-retrofit performance test. This standard provides such rules required for the verification of the guaranteed values. The many variations of retrofits possible make it difficult to cover all cases comprehensively but a few detailed examp
34、les illustrating the application of this standard are presented in the annexes.Page 5 EN 60953-3:2002 BSI 14 May 2002 The main differences in the main clauses between this standard and the RS are listed below. Clause 1: Scope and object Specifically, this standard requires the definitions of new opt
35、ions regarding guarantees. It is possible to guarantee parameters typical of the retrofitted equipment (turbine cylinder efficiency, pressure drop in valve chest, etc.). The RS defines absolute guarantees that are not suitable for specifying improvements between initial and retrofitted equipment, an
36、d therefore, relative guarantee values are introduced in this standard. This standard reviews the contractual provisions, which can vary from one case to another, on account of the wide range of feasible retrofits. These will be subject to an agreement between the parties involved at the time the gu
37、arantees are defined i.e. during the formulation of the contract prior to the performance of the verification tests. Clause 2: Units, symbols, terms and definitions All the units, symbols, terms and definitions of the RS apply to this RC. The RC, however, includes new concepts and terms associated w
38、ith the retrofit situation, especially in the definition of guarantees which can be offered, either additionally or in lieu of those of the RS. A guide matrix has been included to allow the parties involved to choose the parameters to be guaranteed, as appropriate to the project. The guarantees prov
39、ided by the manufacturer can be a) Guarantees of absolute values Turbine plant thermal efficiency or heat rate; turbine thermodynamic efficiency or steam rate or power output at specified steam flow conditions; main steam flow capacity and/or maximum power output; internal efficiency of turbine sect
40、ions. b) Guarantees of relative values Improvement of turbine plant thermal efficiency or heat rate; improvement of thermodynamic efficiency or steam rate or power output; improvement of main steam flow capacity and/or maximum power output; improvement of internal efficiency of turbine sections. Cla
41、use 3: Guiding principles The majority of the guiding principles contained in the RS are also applicable to the retrofit situation. Amendments or addenda to this clause mainly cover the precautions to be taken when tests are to be run before and after the retrofit, and address the reference to be ta
42、ken when a guarantee on improvement in performance is offered. Special attention is directed to the problems of isolation of the cycle, and allowable deviations of measured quantities which can greatly affect the interpretation of results.Page 6 EN 60953-3:2002 BSI 14 May 2002 Clause 4: Measuring te
43、chniques and measuring instruments In the case of retrofit projects, rigid rules cannot be formulated for measuring techniques and instruments. The instruments should be chosen to suit the requirements of the installation and the guarantee value to be verified. Guidance is given in annex J on the se
44、nsitivity of the parameters guaranteed to the accuracy of the individual measurements, so that the most appropriate choice of instrumentation can be made. Since flow is among the most important measurements, this standard gives guidance on the necessity to fit additional flow-measuring devices. Meth
45、ods which allow simultaneous measurement and comparison of primary flows are recommended. The use of flow measurement methods using tracers as an appropriate alternative for some applications where it is difficult to remove flow meters for conventional calibration is given in annex K. Clause 5: Eval
46、uation of tests This standard gives details of the evaluation of additional guarantees applicable to retrofit projects. Specific rules are also given for unaccounted leakages in retrofit applications. Clause 6: Correction of test results and comparison with guarantee The methods of correction define
47、d in the RS are also applicable to this standard but are supplemented by specific rules which apply to the new types of guarantee. For delayed testing, guidance is given on ageing considerations. This clause also covers the validation of the performance values which are used as a reference for deter
48、mining improvement guarantee values: an amendment to the guarantee value is acceptable when the pre-retrofit tests have revealed that the actual condition of the turbine undergoing retrofit is different from the specified condition. The retrofit of the steam turbine, or any part of it, may have cons
49、equences on the balance of the plant (feedheaters, condenser, boiler). If the retrofit affects conditions beyond the interface, then the manufacturer may be required to indicate the consequences of the modification on adjacent equipment items. Clause 7: Measuring uncertainty This clause of the RS is supplemented by provisions for special cases encountered in retrofit projects in annexes I and J. Since these cases can be diverse, it is recommended that an uncertainty calculation be run as ear
