{"id":673,"date":"2019-01-14T00:44:14","date_gmt":"2019-01-14T00:44:14","guid":{"rendered":"http:\/\/johnbrear-plantintegrity.com\/?page_id=673"},"modified":"2019-01-23T01:21:53","modified_gmt":"2019-01-23T01:21:53","slug":"life-and-maintenance-optimisation-of-reheater-tubes","status":"publish","type":"page","link":"https:\/\/johnbrear-plantintegrity.com\/?page_id=673","title":{"rendered":"Life and maintenance optimisation of reheater tubes"},"content":{"rendered":"<p><strong>Component:<\/strong><\/p>\r\n<ul>\r\n    <li>2\u00bcCrMo reheater tubes in a natural-gas fired 270MW power station with 40,000h service<\/li>\r\n<\/ul>\r\n<p><strong>Objective:<\/strong><\/p>\r\n<ul>\r\n    <li>To optimise the chemical-cleaning frequency, based on achieving a further 100,000h service<\/li>\r\n<\/ul>\r\n<p><strong>Approach:<\/strong><\/p>\r\n<ul>\r\n    <li><a href=\"http:\/\/johnbrear-plantintegrity.com\/?page_id=31\">Probabilistic life assessment<\/a>, centred on a mechanistic model addressing creep, fireside and steamside corrosion  and using quantitative inspection data<\/li>\r\n<\/ul>\r\n<p><strong>Results:<\/strong><\/p>\r\n<p>Tube life shown to be sensitive to acid-cleaning interval<br \/>\r\nCleaning every 30,000h shown to be required in order to achieve the desired life<\/p>\r\n<p><strong>Benefits:<\/strong><\/p>\r\n<ul>\r\n    <li>Tube life determined<\/li>\r\n    <li>Optimum maintenance regime identified<\/li>\r\n    <li>Identification of a material upgrade, to 12%Cr, as a cheaper and less disruptive option than the three acid-cleaning operations required to achieve 100,000h<\/li>\r\n<\/ul>\r\n<figure id=\"attachment_675\" aria-describedby=\"caption-attachment-675\" style=\"width: 984px\" class=\"wp-caption alignright\"><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/acid-1.gif\" alt=\"\" width=\"984\" height=\"510\" class=\"size-full wp-image-675\" \/><figcaption id=\"caption-attachment-675\" class=\"wp-caption-text\">Effect of acid-cleaning interval on tube failure probability<\/figcaption><\/figure>\r\n<p><br \/>\r\n<strong>Published:<\/strong><\/p>\r\n<p>Brear, J.M., Jones, G.T., Jarvis, P. and Sanders, J, <br \/>\r\n\u201cOn-line monitoring of power plant components\u201d <br \/>\r\nERA Conf \u2018Engineering Asset Management for Utilities, Industry and Commerce\u2019, London, 7-8 October 1997.  Paper 3.7<\/p>\r\n<p>Brear, J.M., Williamson, J., Cane, B.J., Jones, G.T. and Leavy, K, <br \/>\r\n\u201cPredictive evaluation of superheaters and reheaters - a probabilistic treatment\u2019<br \/>\r\nVGB, KEMA, CRIEPI, EPRI Int Conf \u2018Life Assessment and Extension\u2019, The Hague, The Netherlands, June 1988<\/p>","protected":false},"excerpt":{"rendered":"<p>Component: 2\u00bcCrMo reheater tubes in a natural-gas fired 270MW power station with 40,000h service Objective: To optimise the chemical-cleaning frequency, based on achieving a further 100,000h service Approach: Probabilistic life assessment, centred on a mechanistic model addressing creep, fireside and steamside corrosion and using quantitative inspection data Results: Tube life shown to be sensitive to &hellip; <a href=\"https:\/\/johnbrear-plantintegrity.com\/?page_id=673\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Life and maintenance optimisation of reheater tubes<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":114,"menu_order":9,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-673","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/673","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=673"}],"version-history":[{"count":4,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/673\/revisions"}],"predecessor-version":[{"id":677,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/673\/revisions\/677"}],"up":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/114"}],"wp:attachment":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=673"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}