{"id":2219,"date":"2015-11-20T18:36:35","date_gmt":"2015-11-20T23:36:35","guid":{"rendered":"https:\/\/www.mdaturbines.com\/?p=2219"},"modified":"2022-05-06T13:44:22","modified_gmt":"2022-05-06T17:44:22","slug":"steam-turbine-rotor-repairs","status":"publish","type":"post","link":"https:\/\/www.mdaturbines.com\/resources\/steam-turbine-rotor-repairs\/","title":{"rendered":"Steam Turbine Rotor Repairs"},"content":{"rendered":"<p>Mechanical Dynamics and Analysis inspected and repaired a 20 MW industrial steam turbine rotor. The unit was a 15 stage single condensing design. MD&amp;A\u2019s experts successfully designed and modified the N-1 packing area, and removed the stage 3 and 4 wheels.<\/p>\n<p>Power plant owners face a major challenge of keeping aging turbines up and running &#8212; efficiently and cost-effectively. MD&amp;A is uniquely prepared to meet this challenge. We have the experience and expertise to solve your plant\u2019s problems.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-70703 size-full\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/HSB_Rotor_sm-min.jpg\" alt=\"High Speed Balance Steam Turbine Rotor\" width=\"600\" height=\"510\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/HSB_Rotor_sm-min.jpg 600w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/HSB_Rotor_sm-min-300x255.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/HSB_Rotor_sm-min-188x160.jpg 188w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/HSB_Rotor_sm-min-90x77.jpg 90w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>A failure of the N-1 retractable packing assembly ground a groove in the rotor shaft at the hi-low packing diameter. Also, during a restart, the rotor ramp rates were violated, causing the shrunk on wheels to shift.<\/p>\n<p>The rotor was received at MD&amp;A\u2019s Turbine-Generator Repair Facility in St. Louis with severe damage to the stage 3 and 4 wheels and the N-1 packing area.<\/p>\n<p>The rotor repairs consisted of the following work:<\/p>\n<ul class=\"normal\">\n<li>Thermodynamic evaluation of operating without the 3rd and 4th stage wheels.<\/li>\n<li>Destructive machining removal of the 3rd &amp; 4th stage wheels.<\/li>\n<li>Metal spray buildup of the outboard thrust collar shaft fit area to restore the shrink fit.<\/li>\n<li>A\u00a0sleeve repair to the N-1 packing area.<\/li>\n<li>Straightening, benching back, and polishing the stage 9 leading-edge airfoils.<\/li>\n<li>Replacement of Qty (4) lifted shroud covers on stage 9 by tenon weld restoration.<\/li>\n<li>A\u00a0brazing repair of blade tie wires.<\/li>\n<li>Supply and installation of new packing segments in the N-1 packing box.<\/li>\n<li>Reassembly and final inspections of the rotor.<\/li>\n<li>High-speed balance of the rotor.<\/li>\n<\/ul>\n<figure id=\"attachment_2222\" aria-describedby=\"caption-attachment-2222\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/N-1-packing.jpg\"><img decoding=\"async\" class=\"size-medium wp-image-2222\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/N-1-packing-300x223.jpg\" alt=\"N-1 packing area Rubbing &amp; Grooving Damage\" width=\"300\" height=\"223\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/N-1-packing-300x223.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/N-1-packing-215x160.jpg 215w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/N-1-packing-90x67.jpg 90w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/N-1-packing.jpg 783w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-2222\" class=\"wp-caption-text\">N-1 packing area Rubbing &amp; Grooving Damage<\/figcaption><\/figure>\n<p>MD&amp;A provided a sleeve modification option to repair the damaged N-1 shaft-packing area. The sleeve modification repair included machining of the rotor shaft end to remove the damaged N-1 hi-lo teeth, machining of the shaft to allow for the installation of a new threaded-on sleeve, and final machining of the N-1 hi-lo teeth back to their original position and diameter.<\/p>\n<figure id=\"attachment_70704\" aria-describedby=\"caption-attachment-70704\" style=\"width: 475px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-70704 size-full\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/Modified-packing_sm-min.jpg\" alt=\"Modified N-1 Shaft Geometry\" width=\"475\" height=\"301\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/Modified-packing_sm-min.jpg 475w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/Modified-packing_sm-min-300x190.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/Modified-packing_sm-min-252x160.jpg 252w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2015\/11\/Modified-packing_sm-min-90x57.jpg 90w\" sizes=\"(max-width: 475px) 100vw, 475px\" \/><figcaption id=\"caption-attachment-70704\" class=\"wp-caption-text\">Modified N-1 Shaft Geometry<\/figcaption><\/figure>\n<p>After the N-1 machining modification was complete, the turbine end shaft end components were reassembled. Once assembled, final axial dimensional checks and runouts were performed.<\/p>\n<p>The customer\u2019s primary concern was returning the unit back to service in the most expedited manner, and MD&amp;A fulfilled their needs.<\/p>\n<p>Because of our vast knowledge with many years in the industry and with different types of OEMs (Original Equipment Manufacturers), MD&amp;A experts are capable of performing any <a href=\"https:\/\/www.mdaturbines.com\/parts\/steam-turbine\/\">steam turbine rotor<\/a> repairs. We are your full-service turbine-generator service provider. No matter what the problem, MD&amp;A\u2019s experts have the solution!<\/p>\n<p><strong>Let MD&amp;A perform your Steam Turbine Rotor Repairs today, call our <a href=\"https:\/\/www.mdaturbines.com\/repairs\/steam-turbine\/\">Turbine-Generator Repair Facility<\/a> at\u00a0<\/strong><strong>(314) 880-3000, or use our <a href=\"https:\/\/www.mdaturbines.com\/contact\/\">Contact form<\/a>.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mechanical Dynamics and Analysis inspected and repaired a 20 MW industrial steam turbine rotor. The unit was a 15 stage single condensing design. MD&amp;A\u2019s experts&#8230;<\/p>\n","protected":false},"author":2,"featured_media":2221,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[211,209],"tags":[171,172,99,77],"class_list":["post-2219","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-parts","category-steam-turbine","tag-industrial","tag-n1-packing","tag-rotor-repair","tag-steam-turbine"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Steam Turbine Rotor Repairs Experts &#8211; MDA Turbines<\/title>\n<meta name=\"description\" content=\"MD&amp;A\u2019s experts performed Steam Turbine Rotor Repairs. 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