ENIEC 62364 EUROPEANSTANDARD NORME EUROPEENNE EUROPAISCHE NORM March 2019 ICS 23.100.10; 27.140 Supersedes EN62364:2013 English Version Hydraulicmachines-Guidelinesfordealingwithhydro-abrasive erosioninkaplan,francisandpeltonturbines (IEC62364:2019) Machines hydrauliques - Lignes directrices relatives au Wasserturbinen - Leitfaden fur den Umgang mit traitement de T'erosion hydro-abrasive des turbines kaplan, hydroabrasiver Erosion in Kaplan-, Francis und Pelton- francis et pelton Turbinen (IEC62364:2019) (IEC 62364:2019) This European Standard was approved by CENELEC on 2019-02-18. 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-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre orto any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Siovenia, Spain, Sweden Switzerland, Turkey and the United Kingdom. CENELEC European Committeefor Electrotechnical Standardization Comite Europeen de Normalisation Electrotechnique Europaisches Komitee fur Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels Ref.No.EN IEC62364:2019E ENIEC62364:2019 (E) The text of document 4/351/FDIS, future edition 2 of IEC 62364, prepared by IEC TC 4 "Hydraulic turbines" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 62364:2019. The following dates are fixed: latest date by which the document has to be implemented at (dop) 2019-11-18 national level by publication of an identical national standardorbyendorsement latest date by which the national standards conflicting with (dow) 2022-02-18 the document have to be withdrawn This document supersedes EN 62364:2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights The text of the International Standard IEC 62364:2019 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC60193:1999 NOTE Harmonized as EN 60193:1999. IEC 60609-2:1997 NOTE Harmonized as EN 60609-2:1999. IEC 60041 NOTE Harmonized as EN 60041. ISO 4288 NOTE Harmonized as EN ISO 4288. ISO 2178 NOTE Harmonized as EN ISO 2178. ISO 6507-1 NOTE Harmonized as EN ISO 6507-1. ISO 14916:2017 NOTE Harmonized as EN ISO 14916:2017. 2 IEC62364:2019@IEC2019 -2 FOREWORD INTRODUCTION Scope... 2 Terms, definitions and symbols. 3 Prediction of hydro-abrasive erosion rate... 3.1 Model for hydro-abrasive erosion depth .. .12 3.2 Reference model.... .13 3.3 Simplified hydro-abrasive erosion evaluation 14 4 Design.. 4.1 General 15 4.2 Selection of materials with high resistance to hydro-abrasive erosion and coating.... 4.3 Stainless steel overlays. 16 4.4 Waterconveyancesystem 16 4.5 Valve 4.5.1 General 4.5.2 Protection (closing)of the gap between housing and trunnion.. 17 4.5.3 Stops located outside the valve. 17 4.5.4 Proper capacity of inlet valve operator... 4.5.5 Increase bypass size to allow higher guide vane leakage .. 18 4.5.6 Bypass system design.. 4.6