{"id":1129,"date":"2014-09-10T16:37:05","date_gmt":"2014-09-10T20:37:05","guid":{"rendered":"https:\/\/www.mdaturbines.com\/?p=1129"},"modified":"2022-06-03T11:43:47","modified_gmt":"2022-06-03T15:43:47","slug":"a-10-rotor-straightening","status":"publish","type":"post","link":"https:\/\/www.mdaturbines.com\/resources\/a-10-rotor-straightening\/","title":{"rendered":"A-10 Rotor Straightening & High Speed Balance"},"content":{"rendered":"

Mechanical Dynamics and Analysis<\/a> inspected and repaired an A-10 frame High-Pressure rotor. The unit was a 3600 rpm, 90 MW combined-cycle unit.\u00a0 MD&A\u2019s Turbine-Generator Repair Facility performed the incoming inspections\/evaluations, repair straightening of the rotor, final inspections, as well as high-speed balance.<\/p>\n

Incoming inspections and evaluations consisted of blast cleaning, NDE, visual inspections, material verification, as well as a detailed runout check of the rotor.<\/p>\n

\"Chart2\"<\/a><\/p>\n

The rotor straightening involved an initial stress relief operation, as well as multiple iterations of thermal straightening, to correct the incoming rotor runout condition.<\/p>\n

\"5879-RS\"<\/a><\/p>\n

In support of the rotor straightening, machining modifications were made to the shaft N-3 packing gland area as well as the inboard thrust collar.\u00a0 The N-3 packing gland area on the rotor was machined to a smaller diameter and new packing rings were supplied and installed.\u00a0 The backside of the inboard thrust collar was modified to add a much-needed balance weight plane on the turbine end of the rotor.\u00a0 The thermal straightening process did not require machining of the rotor journals, re-sizing of the journal bearings, machining of the couplings, or line boring of the coupling holes on-site during reinstallation.\u00a0 After completion of all repairs, the High-Pressure rotor was balanced at operating speed and overspeed tested at 110%.<\/p>\n

\"4088-HSB\"<\/a><\/p>\n

SUMMARY<\/strong><\/p>\n

The High-Pressure rotor was received with a bow of 0.040\u201d TIR (total indicator reading) in the N-3 packing area of the rotor. \u00a0This amount of runout would not allow the rotor to spin up through critical speeds, let alone get to rated speed without severe vibration. MD&A successfully straightened the HP rotor to 0.003\u201d TIR using a thermal straightening process. \u00a0The HP rotor was balanced and overspeed tested without incident and returned to the site for reinstallation and startup.<\/p>\n

Have us look at your bowed rotor today. Call our Turbine-Generator Repair<\/a> Facility at\u00a0<\/strong>(314) 880-3000 or use our Contact form<\/a>.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Mechanical Dynamics and Analysis inspected and repaired an A-10 frame High-Pressure rotor. The unit was a 3600 rpm, 90 MW combined-cycle unit.\u00a0 MD&A\u2019s Turbine-Generator Repair…<\/p>\n","protected":false},"author":2,"featured_media":1132,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[209],"tags":[185,144,186,141,143],"class_list":["post-1129","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-steam-turbine","tag-ge-a10","tag-high-speed-balance","tag-n3-packing","tag-rotor-straightening","tag-stress-relief"],"acf":[],"yoast_head":"\nA-10 Rotor Straightening & High Speed Balance – MDA Turbines<\/title>\n<meta name=\"description\" content=\"Mechanical Dynamics and Analysis performed a A-10 frame High Pressure turbine rotor straightening and high speed balance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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