<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <meta name="SKYPE_TOOLBAR" content="SKYPE_TOOLBAR_PARSER_COMPATIBLE" /> <META NAME="keywords" CONTENT="cavitation, erosion, turbine, pump, hydro, power, plant, monitoring, refurbishment, uprating, upgrading, overhaul, maintenance, hydraulic, vibration, acoustic, vibroacoustic, vibro-acoustic, Kaplan, Francis, Kavitation, Pumpe, Wasserkraft, Kraftwerk, ber"> <META NAME="description" CONTENT="Cavitation erosion in turbines: operation optimised for minimum erosion, cavitation diagnostics for erosion suppression, prediction of erosion considering uprating, intelligent cavitation monitoring."> <META NAME="language" CONTENT="English"> <html> <head> <title>Korto Cavitation Services</title> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/> <link rel="stylesheet" type="text/css" href="style.css"> <style type="text/css"> #dhtmltooltip{ position: absolute; width: 150px; border: 1px solid white; padding: 2px; background-color: lightyellow; 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mso-yfti-tbllook:1184;mso-table-lspace:2.25pt;mso-table-rspace:2.25pt; mso-table-anchor-vertical:paragraph;mso-table-anchor-horizontal:column; mso-table-left:right;mso-table-top:middle;mso-padding-alt:0cm 0cm 0cm 0cm'> <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes;mso-yfti-lastrow:yes; height:354.75pt'> <td width="46%" valign=top style='width:46.0%;padding:0cm 0cm 0cm 0cm; height:354.75pt'> <p style='margin-top:0cm'><br> Registrations<br> <span style='mso-no-proof:yes'><img width=8 height=8 id="_x0000_i1107" src="images/holder_veci.jpg"></span><strong><span style='font-family: "Tahoma","sans-serif"'>DUNS</span></strong>: 400106873<br> <span style='mso-no-proof:yes'><img width=8 height=8 id="_x0000_i1106" src="images/holder_veci.jpg"></span>Reg. in <strong><span style='font-family:"Tahoma","sans-serif"'>CCR </span></strong>&amp;<strong><span style='font-family:"Tahoma","sans-serif"'> ORCA</span></strong> <br> <span style='mso-no-proof:yes'><img width=8 height=8 id="_x0000_i1105" src="images/holder_veci.jpg"></span>NATO <strong><span style='font-family: "Tahoma","sans-serif"'>NCAGE</span></strong>: B6183 <br> <span style='mso-no-proof:yes'><img width=8 height=8 id="_x0000_i1104" src="images/holder_veci.jpg"></span>Reg. in <strong><span style='font-family:"Tahoma","sans-serif"'>Lux</span></strong>: B 32.016 <br> <span style='mso-no-proof:yes'><img width=8 height=8 id="_x0000_i1103" src="images/holder_veci.jpg"></span>Lux <strong><span style='font-family: "Tahoma","sans-serif"'>tax</span></strong> 1989 2406 173 <br> <span style='mso-no-proof:yes'><img width=8 height=8 id="_x0000_i1102" src="images/holder_veci.jpg"></span>EU <strong><span style='font-family: "Tahoma","sans-serif"'>VAT</span></strong>: LU 14308966 <br> <span style='mso-no-proof:yes'><img width=8 height=8 id="_x0000_i1101" src="images/holder_veci.jpg"></span>US <strong><span style='font-family: "Tahoma","sans-serif"'>EIN</span></strong>: 98-0497131 <p align="left"> <span class="menuleft"> </span> <span class="menuleft"><strong> <span style='color:white'> APPLICATION EXAMPLES</span></strong><br> </span><span class="menuleft"> <a href="applications/Uprating.pdf"><span style='text-decoration:none'>Uprating acceptable?</span></a><br> <a href="applications/Identification.pdf"><span style='text-decoration:none'>Identification of weak parts</span> </a><br> </span><span class="menuleft"> <a href="applications/Parts.pdf"><span style='text-decoration:none'>Cavitation quality assessment</span></a> <br> <a href="applications/Runner.pdf"><span style='text-decoration:none'>Runner improvement</span></a> <br> <a href="applications/Vanes.pdf"><span style='text-decoration:none'>Guide vanes improvement</span></a><br> <a href="applications/Optimisation_Francis.pdf"><span style='text-decoration:none'>Operation optimisation Francis</span></a><br> <a href="applications/Optimisation_bulb.pdf"><span style='text-decoration:none'>Operation optimisation Bulb</span></a> <br> <a href="applications/Fluctuations.pdf"><span style='text-decoration:none'>Cavitation as a diagnostic tool</span></a><br></a> <br><strong><span style='color:white'> METHODS</span></strong><br> <a href="methods/Cavitation.pdf"><span style='text-decoration:none'>What is cavitation?</span></a><br> <a href="methods/Physical.pdf"><span style='text-decoration:none'>Physical background</span></a><br> <a href="methods/Sensors.pdf"><span style='text-decoration:none'>How many sensors?</span></a><br> <a href="methods/Modulation.pdf"><span style='text-decoration:none'>Raw cavitation data</span></a><br> <a href="methods/Characteristics.pdf"><span style='text-decoration:none'>Cavitation characteristics</span></a><br> <a href="methods/Mechanisms.pdf"><span style='text-decoration:none'>Cavitation mechanisms</span></a><br> <a href="methods/Spatial.pdf"><span style='text-decoration:none'>Spatial distribution</span></a><br> <a href="methods/Calibration.pdf"><span style='text-decoration:none'>Calibration</span></a><br> <a href="methods/How.pdf"><span style='text-decoration:none'>How do we work?</span></a><br> <a href="methods/Monitoring.pdf"><span style='text-decoration:none'>Cavitation monitoring</a> <br> <a href="methods/Model.pdf"><span style='text-decoration:none'>Model vs. prototype</span></a><br> </span></p> <p align="left"><strong><span style='color:white'> DOWNLOAD</span></strong><br> <span class="menuleft"><a href="download.htm"><span style='text-decoration:none'>Papers</span></a><br> <a href="download.htm"><span style='text-decoration:none'>Leaflets</span></a><br> <p align="left"><strong><a href="contact.htm"><span style='text-decoration:none'><span style='color:white'> CONTACTS</span> </a></strong></p> <p align=center style='text-align:center'><span style='mso-no-proof:yes'><img border=0 width=96 height=86 id="_x0000_i1076" src="images/francis.jpg" alt="Cavitation erosion on a Francis runner"></span></p> </td> <td width="65%" valign=top style='width:65.0%;padding:0cm 0cm 0cm 0cm; height:354.75pt'> <p style='margin-bottom:12.0pt'><strong><span style='font-size:12.0pt; font-family:"Tahoma","sans-serif";color:white'><a href="Letter.pdf"> <span style='text-decoration:none; color:white'>Letter to O&M Manager</span></strong> <span style='text-decoration:none'> <span style='font-size:10.0pt; font-family:"Tahoma","sans-serif";color:white'> <br> (Click to read)</span></a> <br><br> <p style='margin-bottom:12.0pt'><strong><span style='font-size:12.0pt; font-family:"Tahoma","sans-serif";color:white'>What is Korto?</span></strong> <br> <br> Since 1996, our company has been providing highly specialised, leading-edge services and products to the hydropower industry.<br> <br> Our staff is a highly specialised team of world-renowned experts from seven countries. <br> <br> Our background lies in advanced proprietary methods and leading-edge research based on extensive full-scale experience. <br> <br> Korto s motto: Stay with the problem until it is solved. </p> <p><strong><span style='font-size:12.0pt;font-family:"Tahoma","sans-serif"; color:white'>Our Products</span></strong> <br><br> <strong> MULTIDIMENSIONAL CAVITATION MONITORING SYSTEMS</strong> <br><br> <strong>" Use<br></strong> - Independent use<br> - As a cavitation channel of the plant monitor<br> <strong>" System configuration</strong><br> - Typically 6 sensors per turbine<br> - One cavitation processor per turbine<br> - One control unit per plant (if used independently)<br> <strong>" Features</strong><br> - High-sensitivity detection of deterioration effects<br> - Coverage of all cavitation segments<br> - Diagnostic functions<br> <strong>" Data</strong><br> - True total cavitation intensity <br> - Assessment of spiral-case and distributor influence<br> - Runner-blade resolution<br> - Accumulated cavitation intensity<br> <strong>" Implementation</strong><br> - Multidimensional algorithm<br> - FPGA/RT Technology<br> - Ethernet connection to plant/company network<br> <strong>" Options</strong><br> - Operation data input<br> - Analog total cavitation intensity output <br> - Control unit<br> <strong>" Application</strong><br> - Operation optimization<br> - Tracking changes, detection of incidents<br> - Predictive turbine maintenance <br><br> </p style> <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:-10 pt'> <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=168 height=126 src="images/MonInst2.jpg" alt="Cavitation sensors are installed in robust protection boxes on 6 or 8 guide-vane shafts or links."></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Cavitation sensors are installed in robust protection boxes on 6 or 8 guide-vane shafts or links.</span> <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=168 height=126 src="images/MonInst1.jpg" alt="Cavitation processor (gray box on the wall) is installed close to the distributor."></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Cavitation processor (gray box on the wall) is installed close to the distributor.</span> <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=225 height=126 src="images/Monitor.jpg" alt="Cavitation processor Type 7391P (internal view)"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Cavitation processor Type 7391P (internal view).</h6> <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=225 height=128 src="images/7391_Cons_Opt.jpg" alt="Cavitation Monitoring System Type 7391 - Connections, Options"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Cavitation Monitoring System Type 7391 - Connections, Options<br><br> Details: <a href="images/7391_Options_Connections_EN.pdf" <span style='text-decoration:none'>download PDF 843 kB</span></a><br> <br></h6></p> <p><strong><span style='font-size:12.0pt;font-family:"Tahoma","sans-serif"; color:white'>Our Services</span></strong> <br> <br><strong> ON-SITE MULTIDIMENSIONAL DIAGNOSTIC CAVITATION TESTS</strong> <br> <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'> <a href="downloads/leaflets/Korto_Leaflet_Tests.pdf" <span style='text-decoration:none'>Please click to see PDF (596 kB)</span></a>.<br> <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=168 height=126 src="images/Test_web.jpg" alt="A small vibro-acoustic laboratory is installed close to the distributor. Turbine operation is minimally disturbed."></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>A small vibro-acoustic laboratory is installed close to the distributor. Turbine operation is minimally disturbed.</span> <br> <p><strong><span style='font-size:12.0pt;font-family:"Tahoma","sans-serif"; color:white'>Our Technique</span></strong> <br> <p><strong><span style='font-family:"Tahoma","sans-serif"'>We use our own multidimensional vibro-acoustic technique which:</span></strong><br> <br> " Identifies cavitation mechanisms<br> " Assesses the role of turbine parts in cavitation<br> " Yields data on the spatial distribution of cavitation<br> " Senses all cavitation segments in the turbine<br> " Delivers detailed turbine cavitation characteristics<br> " Detects adverse effects with high sensitivity</p> <br> <p><strong><span style='font-size:12.0pt;font-family:"Tahoma","sans-serif"; color:white'>When Might You Need Us?</span></strong> <br> <br> <strong> " Commissioning a turbine: </strong> <br> - Model predictions correct?<br> - Contract requirements met?<br> <strong> " Refurbishing or uprating a turbine:</strong> <br> - True state before and after refurbishment/upgrade<br> <strong> " Routine operation:</strong> <br> - Operation optimisation to achieve minimum erosion<br> - Maintenance optimisation in respect<br> - Control of ageing effects and incidents</p> <br> <p><strong><span style='font-size:12.0pt;font-family:"Tahoma","sans-serif"; color:white'>Some Projects</span></strong></p> <p> <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'> <strong><span style='font-family:"Tahoma","sans-serif"'>EFFICIENCY AND CAVITATION IN CAM OPTIMISATION OF A KAPLAN TURBINE</span></strong><br> <br> The cam of the 28-MW Kaplan turbine at Kembs HPP of Electricit de France was optimised in a prototype test. Cavitation was also measured; the multidimensional method was applied. Two cam definitions were checked: one from the model test, and one optimised in the prototype test. The two cam definitions yield substantially differing efficiency values and cavitation intensity values: <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'><span style='mso-no-proof:yes'><img border=0 width=224 height=116 src="images/Kembs_cav.jpg" alt="Cavitation intensity vs. power for two cams: Black - optimised cam; Red - cam defined in the model test"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Cavitation intensity vs. power for two cams: Black - optimised cam; Red - cam defined in the model test</span> <br><br> Detailed analysis shows that strong cavitation appears only within a narrow circumferential interval behind the spiral casing: <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'><span style='mso-no-proof:yes'><img border=0 width=150 height=150 src="images/Kembs_spiral.jpg" alt="Normalised cavitation intensity vs. angular position for different power values"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Normalised cavitation intensity vs. angular position for different power values</span> <br><br> This suggests it is possible to improve the turbine behaviour by changing the inclination and/or profile of the stay vanes in the critical circumferential interval. <br><br> A new cam was installed and an anti-cavitation layer was applied on the endangered part of the runner. The result: the metal loss found earlier after 1500 hours is now found only after 8000 hours. <br><br> More info: <a href="mailto:info@korto.com">info@korto.com</a> or Mr. Philippe Gauvin, Electricit de France - CIH, <a href="mailto:philippe.gauvin@edf.fr">philippe.gauvin@edf.fr</a> or Mrs. Marie Delagarde, Electricit de France - DTG, <a href="mailto:marie.delagarde@edf.fr">marie.delagarde@edf.fr</a></p> <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'> <br> <strong><span style='font-family:"Tahoma","sans-serif"'>CAVITATION MONITORING - FRANCE</span></strong><br> <br> Following the multidimensional cavitation test at Kembs 1 Kaplan unit of EDF, France, a broadened multidimensional cavitation monitor was left there. It consists of 20 cavitation sensors, remote-sensors unit, and the central processor. <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'><span style='mso-no-proof:yes'><img border=0 width=157 height=107 src="images/Kembs_mon.jpg" alt="20+4+4 cavitation sensors on Kembs 1"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>20+4+4 cavitation sensors on Kembs 1</span> <br><br> The aim of this hybrid installation - the cavitation monitor and the automatic cavitation-data acquisition system - is to deliver detailed cavitation data at various operation points which were not reached during the test. <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'><span style='mso-no-proof:yes'><img border=0 width=134 height=100 src="images/Kembs_Pascal.jpg" alt="Pascal Ratabouil of EDF installing the central processor"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Pascal Ratabouil of EDF installing the central processor</span> <br><br> More info: <a href="mailto:info@korto.com">info@korto.com</a> or Mr. Philippe Gauvin, Electricit de France - CIH, <a href="mailto:philippe.gauvin@edf.fr">philippe.gauvin@edf.fr</a> or Mrs. Marie Delagarde, Electricit de France - DTG, <a href="mailto:marie.delagarde@edf.fr">marie.delagarde@edf.fr</a> or Mr. Pascal Ratabouil, Electricit de France - GMH Est-EIS, <a href="mailto:pascal.ratabouil@edf.fr">pascal.ratabouil@edf.fr</a></p> <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'> <br> <strong><span style='font-family:"Tahoma","sans-serif"'>CAVITATION IN A 650 MW FRANCIS TURBINE</span></strong><br> <br> Korto tested a 650-MW Francis turbine at the Third Powerplant of the USBR's Grand Coulee Dam, which is the largest electric power producing facility and the largest concrete structure in the USA. <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'><span style='mso-no-proof:yes'><img border=0 width=170 height=100 src="images/Grand Coulee.jpg" alt="Grand Coulee Dam has 6800 MW of installed generating capacity in its four hydropower plants."></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Grand Coulee Dam has 6800 MW of installed generating capacity in its four hydropower plants.</span> <br><br> The turbine global cavitation characteristics, which gives the erosion rate as a function of turbine power setting, are determined (black curve, below). Combined with the power setting statistics (blue), they yield an estimate of the contribution of each power setting to the erosion (red). <br> Such data can be used for operation optimisation and, if delivered by permanent monitoring, for maintenance optimisation. <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'><span style='mso-no-proof:yes'><img border=0 width=250 height=140 src="images/GC20.jpg" alt="Cavitation data (black and red) are compared to the turbine efficiency (violet). Power scale: 340-700 MW."></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Cavitation data (black and red) are compared to the turbine efficiency (violet). Power scale: 340-700 MW.</span> <br><br> Quite uniform cavitation quality of the runner blades was found. The mean runner cavitation intensity behind different sections of the spiral casing is determined (below). This shows that the spiral casing is not optimal with respect to cavitation. <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'><span style='mso-no-proof:yes'><img border=0 width=100 height=100 src="images/Spiral.jpg" alt=""></span></p> <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'> In this test three techniques for cavitation diagnostics and monitoring are compared: <br> <strong>(1) Simple</strong>: One sensor on a wicket gate link - simple data processing <br> <strong>(2) Simple</strong>: One sensor on the draft tube wall - simple data processing <br> <strong>(3) Multidimensional</strong>: Sensors on all wicket gate links - complex data processing. - This is Korto's approach to obtain the data shown above. </p> <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'><span style='mso-no-proof:yes'><img border=0 width=250 height=140 src="images/Accu.jpg" alt="Blade-passage modulation amplitude vs. turbine power setting as measured in different sensor locations"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Blade-passage modulation amplitude vs. turbine power setting as measured in different sensor locations</span> <br><br> In 24 positions of the sensor in <strong>(3)</strong> different estimates of the cavitation intensity were obtained. As a function of turbine power setting, they are presented in different colours above. The final result in <strong>(3)</strong>, derived from all these data, incorporates contributions from all locations in the turbine and all cavitation mechanisms, while only one curve (black) is used as the final result in <strong>(1)</strong>. Obviously, the results of the one-sensor techniques, thus also of <strong>(1)</strong> and <strong>(2)</strong>, are quite arbitrary. <br> A further disadvantage of <strong>(2)</strong> is sensor's location. The sensor on the draft tube wall of the Francis turbine predominantly senses free vortices in the draft tube. Using its readings to estimate erosive rotor cavitation results in false conclusion: </p> <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'><span style='mso-no-proof:yes'><img border=0 width=200 height=70 src="images/Draft_tube.jpg" alt="Green...no cavitation, yellow...weak cavitation, red...strong cavitation"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Green...no cavitation, yellow...weak cavitation, red...strong cavitation</span> <br><br> In <strong>(3)</strong>, various special signal and data processing tools, such as "worms" shown below, are used to identify different cavitation mechanisms, determine the role of different turbine elements in cavitation processes, and derive un-biased estimates of cavitation intensity. None of this is possible with the simple methods. <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'><span style='mso-no-proof:yes'><img border=0 width=250 height=140 src="images/Worms.jpg" alt="Cavitation intensity (colour) vs. instantaneous runner angular position (horizontal) and power setting (vertical - 350 MW top, 700 MW bottom)"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Cavitation intensity (colour) vs. instantaneous runner angular position (horizontal) and power setting (vertical - 350 MW top, 700 MW bottom)</span> <br><br> More info: <a href="mailto:info@korto.com">info@korto.com</a> or Mr. G. Michael Strombach, USBR Grand Coulee Dam, <a href="mailto:mstrombach@pn.usbr.gov">mstrombach@pn.usbr.gov</a></p> <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'> <br> </td> </tr> </table> <p class=MsoNormal><span style='font-size:10.0pt;mso-fareast-font-family: "Times New Roman"'><o:p></o:p></span></p> </td> <td width=2 valign=top style='width:1.5pt;background:#AFC0D0;padding:0cm 0cm 0cm 0cm; height:390.75pt' background="images/dots_w.gif"> <p class=MsoNormal><span style='mso-fareast-font-family:"Times New Roman"; mso-no-proof:yes'><img border=0 width=1 height=1 id="_x0000_i1038" src="images/px1.gif"></span><span style='mso-fareast-font-family:"Times New Roman"'><o:p></o:p></span></p> </td> <td width=291 valign=top style='width:218.25pt;background:#AFC0D0; padding:0cm 0cm 0cm 0cm;height:390.75pt'> <p class=left>&nbsp;</p> <p><b><span style='font-size:12.0pt;color:white'>News &amp; Events</span></b></p> <p><strong><span style='font-family:"Tahoma","sans-serif"'>Korto at HYDROVISION BRAZIL 2011 </span></strong><br> <br> The <a href="http://www.hydrovisionbrazil.com/index.htmlommunity.hydrovisionbrazil.com/index.php5?path=Home&Action=home">first HydroVision conference in Brazil </a> <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=157 height=44 src="images/HVB2011.jpg" alt=""></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'></span> took place in Barra da Tijuca, Rio de Janeiro, on September 20-22. <p style='margin-top:-0.4cm'><span style='mso-no-proof:yes'><img border=0 width=157 height=44 src="images/Korto_banner.jpg" alt="The Korto banner on the conference site presents Korto as a sponsor."></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>The Korto banner on the conference site presents Korto as a sponsor.</span> <br><br> Korto had a booth at the exhibition. <a href="http://community.hydrovisionbrazil.com/index.php5?id=207279&fid=20e965ca61a8df3970d31ff3b7071f29&offset=0&highlight=cavitation&bc_id=eb233f5f9f0a6f7a69f5c18a7eb77be3&compact=0&tblank=&path=Home&Action=showCompany">Korto's profile and a review of products</a> can be seen on the conference site. <br> <p><strong><span style='font-family:"Tahoma","sans-serif"'>Korto at HYDROVISION INTERNATIONAL 2011 </span></strong><br> <br> The<a href="http://www.hydroevent.com/index.html"> first hydropower event</a> in 2011 took place in Sacramento, California, USA, on July 19-22. <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=157 height=44 src="images/HydroVision.jpg" alt="3,451 delegates attended 70 sessions with over 450 speakers and over 260 exhibiting companies."></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>3,451 delegates attended 70 sessions with over 450 speakers and over 260 exhibiting companies.</span> <br><br> Korto had a booth at the exhibition. <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=157 height=145 src="images/HVI2011VisitorWeb.jpg" alt="Ms. Luana Fidelis Silva of Zollern Co. as Korto's guest"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Ms. Luana Fidelis Silva of Zollern Co. as Korto's guest</span> <br><br> B. Bajic presented a paper <a href="downloads/papers/Korto_Multidimensional_cav_mon_in_FPGA_RT_Tech_HVI2011.pdf" <span style='text-decoration:none'>(download PDF 3086 kB),</span></a> and at VibroSystM's annual workshop on machine condition monitoring <a href="images/HV2011_AGENDA.pdf" <span style='text-decoration:none'>(program PDF 57 KB), </span></a> he spoke about cavitation monitoring and diagnostics <a href="downloads/presentations/VSM_Workshop_2011_Cavitation.pdf" <span style='text-decoration:none'>(download PDF 1810 kB).</span></a> <br><br> <p><strong><span style='font-family:"Tahoma","sans-serif"'>KORTO IN RUSSIA</span></strong><br> <br> <strong>Korto at HydroVision Russia, Moscow, March 2011</strong> <br><br>At this joint event with Russia Power 2011 Conference Korto had a booth at the exhibition. Korto shared it with VibroSystM. The occasion was used to discuss the possibility of partnership between VibroSystM and Korto. <br> <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=157 height=103 src="images/HVR2011.jpg" alt="From left: Marius Cloutier, President, VibroSystM; Imi Holderna, Senior Business Representative, VibroSystM; and Branko Bajic, Managing Director, Korto."></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>From left: Marius Cloutier, President, VibroSystM; Imi Holderna, Senior Business Representative, VibroSystM; and Branko Bajic, Managing Director, Korto.</span> <br><br> At the conference, B. Bajic made a presentation on multidimensional cavitation monitoring in FPGA/RT technology <a href="downloads/papers/Korto_Cavitation_monitor_in_FPGA-RT_HVRussia_2011.pdf" <span style='text-decoration:none'>(download PDF 5530 kB).</span></a><br> <br> <br> <strong>Russia Power Conference, Moscow, April 2010</strong> <br><br>This three-day conference incorporated a hydropower track. Korto presented the paper  Multidimensional scanning of turbine cavitation <a href="downloads/papers/Korto_Mnogomernoe_skanirovanie_kavitacii_Russia_Power_2010.pdf" <span style='text-decoration:none'>(download PDF 2200 kB).</span></a><br> <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=157 height=105 src="images/Russia_Veterans.jpg" alt="B. Bajic of Korto (left) with the veterans of Russian hydropower science, Anatoly A. Sotnikov, Project Chief Designer (middle), and Igor Pylev, Deputy Chief Designer, both from OJSC Power Machines, St. Petersburg"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>B. Bajic of Korto (left) with the veterans of Russian hydropower science, Anatoly A. Sotnikov, Project Chief Designer (middle), and Igor Pylev, Deputy Chief Designer, both from OJSC Power Machines, St. Petersburg</span> <br><br> The conference was an excellent place to meet Russian hydropower specialists. <p><strong><span style='font-family:"Tahoma","sans-serif"'>KORTO IN SPAIN</span></strong><br> <br> <strong>Gas Natural Fenosa: Peares</strong> <br><br>A test has started at Peares HPP aiming at the diagnosis of cavitation on runners and in the draft tubes of three Francis 60-MW turbines with very wild behaviour in rough zones.</p> <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=149 height=81 src="images/Peares2010.jpg" alt="From left to right: Hugo Rodriguez Rodriguez, Fenosa; Jose Manuel Lorenzo Gomez, Fenosa, Branko Bajic, Korto"></span><br> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>From left to right: Hugo Rodriguez Rodriguez, Fenosa; Jose Manuel Lorenzo Gomez, Fenosa, Branko Bajic, Korto</span> <br><br> Measurement lasting one hour was sufficient to acquire runner-cavitation data and obtain a rough estimate of global cavitation characteristics; much more time will be needed to reveal all the cavitation details.</p> <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=170 height=100 src="images/PearesTest.jpg" alt="Screen of the test-controlling computer"></span><br> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Screen of the test-controlling computer</span> <br><br> An estimate of global cavitation characteristic can be seen on the graph in the middle. Here is the same in better resolution: <a href="images/PearesTestBetter.jpg" <span style='text-decoration:none'>PDF 329 kB</span></a><br> </p> <p><strong><span style='font-family:"Tahoma","sans-serif"'>KORTO IN BRAZIL</span></strong><br> <br> <strong>Cavitation Test at Ilha Solteira HPP</strong> <br><br> The R&D project "Application of Acoustic Emission Technique for Detection of Discontinuities in Turbine Blades", financed by ANEEL and realised by Physical Acoustic South America - PASA, and Cia Energtica de So Paulo - CESP, was broadened to include diagnotics of runner cavitation. Korto was asked to test two turbines at Ilha Solteira which differ in the trailing-edge form of the pre-distribuidor vanes. <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'><span style='mso-no-proof:yes'><img border=0 width=224 height=110 src="images/ILS.jpg" alt="Ilha Solteira, the third biggest HPP of Brazil and among ten biggest in the world, has 20 Francis turbines wich generate a total of 3444 MW."></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Ilha Solteira, the third biggest HPP of Brazil and among ten biggest in the world, has 20 Francis turbines wich generate a total of 3444 MW.</span> <br><br> The multidimensional technique based on 26 cavitation sensors was applied. <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=224 height=107 src="images/ILS2010.jpg" alt="From left: Allan Machado and Renato Farias of PASA, Alcides Souza and Ricardo Avante of CESP, Laura Cabral and Branko Bajic of Korto"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>From left: Allan Machado and Renato Farias of PASA, Alcides Souza and Ricardo Avante of CESP, Laura Cabral and Branko Bajic of Korto</span> <br><br> More info: <a href="mailto:info@korto.com">info@korto.com</a> or Sr. Alcides Donizeti Souza, CESP, <a href="mailto:alcides.souza@cesp.com.br">alcides.souza@cesp.com.br</a></p> <p><strong><span style='font-family:"Tahoma","sans-serif"'>Visit to Capivara HPP of Duke Energy</span></strong><br> <br> Korto's team visited Capivara and discussed with Mr. Renato Jose Baccili Castilho, Manager, Mr. Vincente Borro, Electro-Mechanical Maintenance Engineering, and their collaborators the specific problem experienced by the four Francis 150-MW turbines at Capivara. Since they are used for frequency stabilisation, they are exposed to a rapid and strong fluctuating load. The question arises of the financial costs resulting from the deterioration effects, among others things, caused by cavitation. <br><br> <p><strong><span style='font-family:"Tahoma","sans-serif"'>Partnership in Brazil</span></strong><br> <br> At a meeting at the headquarters of Monitoring and Diagnostics - M&D, in Rio de Janeiro, Mr. Hlio Ricardo T de Azevedo, Director, Mr. Saderson Pereira S de Souza, Engineering Manager, both from M&D, Dr. Branko Bajic and Mrs. Laura Cabral, from Korto, discussed cooperation between the two companies, where Korto will support M&D with the cavitation channels of M&D s monitoring systems and M&D will promote Korto s interests in Brazil.<p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=179 height=86 src="images/M&D_meeting.jpg" alt="From right to left: Hlio Ricardo and Sanderson Pereira, M&D, and Laura Cabral e Branko Bajic, Korto"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>From right to left: Hlio Ricardo and Sanderson Pereira, M&D, and Laura Cabral e Branko Bajic, Korto</span> <br><br> <p><strong><span style='font-family:"Tahoma","sans-serif"'>KORTO AT HYDRO 2010</span></strong><br> <br> The biggest international conference on hydro power, HYDRO 2010, <a href="http://www.hydropower-dams.com">www.hydropower-dams.com</a>, took place in Lisbon, Portugal, at the end of September. <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=70 height=70 src="images/HYDRO2010_LOGO.jpg" alt=""></span></p> <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'> Korto had a booth at the accompanying exhibition. These posters were shown: <br> - HPP Grand Coulee <a href="downloads/posters/GC_Final.pdf" <span style='text-decoration:none'>(download PDF 2408 kB)</span></a><br> - HPP Burfell <a href="downloads/posters/Burfell_Final.pdf" <span style='text-decoration:none'>(download PDF 1680 kB)</span></a><br> - HPP Kembs <a href="downloads/posters/Kembs_Final.pdf" <span style='text-decoration:none'>(download PDF 2408 kB)</span></a><br> - HPP Belesar <a href="downloads/posters/Belesar_Final.pdf" <span style='text-decoration:none'>(download PDF 561 kB)</span></a><br> - Korto Cavit Monit <a href="downloads/posters/Korto_Monitor_Final.pdf" <span style='text-decoration:none'>(download PDF 731 kB)</span></a><br> <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=168 height=131 src="images/Lisbon stand.jpg" alt="Korto booth"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Korto booth</span> <br><br> Many interesting and important people paid us a visit. <br> <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:-10 pt'> <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=202 height=115 src="images/Lisbon visitors.jpg" alt="From left: Sergey Yudin, Project Manager, Energomashexport; Marius Cloutier, President, VibroSystM; Imi Holderna, Senior Business Representative, VibroSystM; Laura Cabral, Korto; Branko Bajic, Korto "></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>From left: Sergey Yudin, Project Manager, Energomashexport; Marius Cloutier, President, VibroSystM; Imi Holderna, Senior Business Representative, VibroSystM; Laura Cabral, Korto; Branko Bajic, Korto</span> <br><br> Korto's paper on the multidimensional technique for diagnostic and monitoring of turbine cavitation was presented <a href="downloads/papers/Korto_Hydro_2010.pdf" <span style='text-decoration:none'>(download PDF 1350 kB)</span></a>.<br> <br> More info: <a href="mailto:info@korto.com">info@korto.com</a> </p> <p style='margin-top:0cm;margin-right:15.0pt;margin-bottom:0cm; margin-left:8pt;margin-bottom:.0001pt'> <p><strong><span style='font-family:"Tahoma","sans-serif"'>KORTO IN FRANCE</span></strong><br> <br> <strong>Electricit de France - Kembs</strong> <br><br>A team comprised of Electricit de France, Andritz Hydro, and Korto Cavitation Services <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=224 height=127 src="images/Kembs_people.jpg" alt="From left to right - Standing: Roland Blaser, Andritz; Philippe Gauvin, EDF; Marcel Saugy, Andritz; Pascal Ratabouil, EDF, Michel Salvi, Andritz; Branko Bajic, Korto; Sitting: Nadine Pajean, EDF; Marie Delagarde, EDF; Benjamin Dufils, EDF"></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>From left to right - Standing: Roland Blaser, Andritz; Philippe Gauvin, EDF; Marcel Saugy, Andritz; Pascal Ratabouil, EDF, Michel Salvi, Andritz; Branko Bajic, Korto; Sitting: Nadine Pajean, EDF; Marie Delagarde, EDF; Benjamin Dufils, EDF</span> <br><br> made a complex test of the refurbished and upgraded 28-MW Kaplan unit 1 at Kembs HPP. <p style='margin-top:0cm'><span style='mso-no-proof:yes'><img border=0 width=126 height=312 src="images/Kembs_Alsace.jpg" alt="Kembs (black square) is the first in a chain of 11 hydropower plants on the Grand d'Alsace in North-East France."></span></p> <p style='margin-bottom:12.0pt'><span style='font-size:6.0pt; font-family:"Tahoma","sans-serif";color:black'>Kembs (black square) is the first in the chain of 11 hydropower plants on the Grand Channel d'Alsace in North-East France.</span> <br><br> Korto's task was to estimate the cavitation behaviour of the unit. </td> </tr> </table> <table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=780 style='width:585.0pt;mso-cellspacing:0cm;mso-yfti-tbllook:1184;mso-padding-alt: 0cm 0cm 0cm 0cm' height=53> <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes;height:.75pt'> <td colspan=2 style='padding:0cm 0cm 0cm 0cm;height:.75pt'> </td> </tr> <tr style='mso-yfti-irow:1;height:14.25pt'> <td colspan=2 style='background:#28549E;padding:0cm 0cm 0cm 0cm;height: 14.25pt'> <p class=MsoNormal align=center style='text-align:center'><span style='mso-fareast-font-family:"Times New Roman";mso-no-proof:yes'><img border=0 width=8 height=8 id="_x0000_i1027" src="images/px1.gif"></span><span class=left1><span style='font-size:8.5pt;mso-fareast-font-family:"Times New Roman"'><a href="http://www.korto.com"> <strong><span style='font-size:10.0pt; 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