{"id":64934,"date":"2019-05-08T16:51:03","date_gmt":"2019-05-08T20:51:03","guid":{"rendered":"https:\/\/www.mdaturbines.com\/?p=64934"},"modified":"2022-04-28T09:11:51","modified_gmt":"2022-04-28T13:11:51","slug":"rotor-steeple-indications-diaphragm-repairs","status":"publish","type":"post","link":"https:\/\/www.mdaturbines.com\/es\/resources\/rotor-steeple-indications-diaphragm-repairs\/","title":{"rendered":"Rotor Steeple Indications and Diaphragm Repairs"},"content":{"rendered":"<p>Mechanical Dynamics &amp; Analysis (MD&amp;A) experts recently completed <a href=\"https:\/\/www.mdaturbines.com\/repairs\/steam-turbine\/\">steampath inspection and repair services<\/a> for a customer during a major overhaul. The Alstom\u00ae steam turbine consisted of an HP\/IP turbine (stages 1-15) and a single flow LP turbine (stages 16-21).<\/p>\n<p>A detailed incoming inspection was performed for the HP\/IP and LP rotors and found relevant indications in the LP rotor steeples at L-1 (stage 20) through magnetic particle inspection, in addition to minor damages identified on the HP\/IP rotor.<\/p>\n<p>Finding indications in the last-stage LP rotor steeples (also known as fir-tree grooves) is a common issue.\u00a0 Basically, the steeple indications are caused by corrosion fatigue (when a material degrades due to the combination of corrosion and cyclic stresses).<\/p>\n<p>Repair of the LP rotor included removal of the L-1 steeple indications by hand tooling, followed by blending and polishing. There were 3 steeple indications that were noticeably deeper than the rest. The approximate depth of these deeper indications was 3 mm (0.12\u201d) located on the convex side of the steeple.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-64955 size-full\" title=\"Rotor Steeple\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/Img1_WP.png\" alt=\"Rotor Steeple\" width=\"660\" height=\"440\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/Img1_WP.png 660w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/Img1_WP-300x200.png 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/Img1_WP-240x160.png 240w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/Img1_WP-90x60.png 90w\" sizes=\"(max-width: 660px) 100vw, 660px\" \/><\/p>\n<p>A <a href=\"https:\/\/www.mdaturbines.com\/services\/steam-turbine\/remaining-life-finite-element-analysis\/\">finite element analysis<\/a> was performed to verify the structural integrity of the steeples after grinding. Based on the analysis, the L-1 steeple repair was found to be acceptable. After all rotor repairs were complete, the rotors were balanced, and the journals were strapped lapped prior to leaving the workshop.<\/p>\n<p>Incoming inspections were also completed on the HP\/IP and LP diaphragms.\u00a0 The HP\/IP <a href=\"https:\/\/www.mdaturbines.com\/repairs\/steam-turbine\/stationary-component-repair\/\">diaphragms<\/a> arrived at the workshop with the lower half appendages removed for reverse engineering. Minor damages were noted on the LP diaphragms including horizontal joint erosion and foreign object damage to the partition trailing edges on all stages, as well as damage to the steam seal face on stages 17-21.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-64959 size-medium\" title=\"Rotor Steeple\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/stage-10-3-300x157.jpg\" alt=\"Rotor Steeple\" width=\"300\" height=\"157\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/stage-10-3-300x157.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/stage-10-3-768x401.jpg 768w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/stage-10-3-90x47.jpg 90w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/stage-10-3.jpg 900w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>Repair work to the HP\/IP diaphragms included installing new appendage rings with honeycomb seals, which were supplied by MD&amp;A Parts.\u00a0 To ensure proper fitting, the appendage and bore packing fit diameters were machined round prior to the installation of the new appendages. Additionally, the dowel pins were removed, and the horizontal joint was skim cut.\u00a0 Dowel pin holes were then enlarged, and oversized dowel pins were installed.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-64960 size-medium\" title=\"Rotor Steeple\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/stage-5-4-300x166.jpg\" alt=\"Rotor Steeple\" width=\"300\" height=\"166\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/stage-5-4-300x166.jpg 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/stage-5-4-768x425.jpg 768w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/stage-5-4-1024x567.jpg 1024w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/stage-5-4-289x160.jpg 289w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/stage-5-4-90x50.jpg 90w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/stage-5-4.jpg 1129w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>New bore packing (with honeycomb seals) for stages 2-9 and 11-15 were also supplied by <a href=\"https:\/\/www.mdaturbines.com\/parts\/steam-turbine\/\">MD&amp;A Parts<\/a>.\u00a0 The bore packing was test fitted after appendage installation.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-64956 size-medium\" title=\"Rotor Steeple\" src=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/Img3_WP-300x200.png\" alt=\"Rotor Steeple\" width=\"300\" height=\"200\" srcset=\"https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/Img3_WP-300x200.png 300w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/Img3_WP-240x160.png 240w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/Img3_WP-90x60.png 90w, https:\/\/www.mdaturbines.com\/wp-content\/uploads\/2019\/05\/Img3_WP.png 660w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>Minor repairs were performed on the LP diaphragms including horizontal joint weld repairs and removal of broken studs. After all diaphragm repairs were complete, new horizontal joint hardware was supplied by MD&amp;A Parts and test-fitted before the diaphragms left the workshop.<\/p>\n<p>Through MD&amp;A\u2019s state-of-the-art repair facility and quick access to replacement parts, an extensive inspection and necessary repairs were completed by our experts in a timely manner that allowed the unit to be quickly returned to the site.<\/p>\n<p><strong>Call MD&amp;A today for any <a href=\"https:\/\/www.mdaturbines.com\/repairs\/steam-turbine\/\">turbine repair<\/a> at +1 (314) 880-3000 or use\u00a0<u><a href=\"https:\/\/www.mdaturbines.com\/contact\/\">our Contact form<\/a>.<\/u><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mechanical Dynamics &amp; Analysis (MD&amp;A) experts recently completed steampath inspection and repair services for a customer during a major overhaul. The Alstom\u00ae steam turbine consisted&#8230;<\/p>\n","protected":false},"author":2,"featured_media":64960,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[211,209],"tags":[202,207,184,204,206,99,205,94],"class_list":["post-64934","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-parts","category-steam-turbine","tag-alstom","tag-bore-packing","tag-diaphragm-repair","tag-finite-element-analysis","tag-honeycomb-seals","tag-rotor-repair","tag-rotor-steeple-indications","tag-turbine-repair"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rotor Steeple Indications and Diaphragm Repairs &#8211; Steam Turbine<\/title>\n<meta name=\"description\" content=\"MD&amp;A experts recently completed steampath inspection and repair 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