{"id":1020,"date":"2019-01-22T11:09:21","date_gmt":"2019-01-22T11:09:21","guid":{"rendered":"http:\/\/johnbrear-plantintegrity.com\/?page_id=1020"},"modified":"2019-01-23T01:26:55","modified_gmt":"2019-01-23T01:26:55","slug":"the-effect-of-carburisation-on-heater-tube-life","status":"publish","type":"page","link":"https:\/\/johnbrear-plantintegrity.com\/?page_id=1020","title":{"rendered":"The effect of carburisation on heater tube life"},"content":{"rendered":"<figure id=\"attachment_1026\" aria-describedby=\"caption-attachment-1026\" style=\"width: 476px\" class=\"wp-caption alignright\"><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Carburisation-and-fireside-corrosion-9CrMo-tube.jpg\" alt=\"\" width=\"476\" height=\"292\" class=\"size-full wp-image-1026\" srcset=\"https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Carburisation-and-fireside-corrosion-9CrMo-tube.jpg 793w, https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Carburisation-and-fireside-corrosion-9CrMo-tube-300x184.jpg 300w, https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Carburisation-and-fireside-corrosion-9CrMo-tube-768x472.jpg 768w\" sizes=\"(max-width: 476px) 100vw, 476px\" \/><figcaption id=\"caption-attachment-1026\" class=\"wp-caption-text\">Carburisation and fireside corrosion - 9CrMo tube<\/figcaption><\/figure>\r\n<p><strong>Component:<\/strong><\/p>\r\n<ul>\r\n    <li>9CrMo tubes in a Platformer heater, with severe internal carburisation that had led to cracking and spalling of the carburised layer<\/li>\r\n<\/ul>\r\n<figure id=\"attachment_1023\" aria-describedby=\"caption-attachment-1023\" style=\"width: 476px\" class=\"wp-caption alignright\"><img decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Cracked-and-carburised-9Cr.jpg\" alt=\"\" width=\"476\" height=\"286\" class=\"size-full wp-image-1023\" \/><figcaption id=\"caption-attachment-1023\" class=\"wp-caption-text\">Cracking of carburised 9CrMo tube<\/figcaption><\/figure>\r\n<p><strong>Objective:<\/strong><\/p>\r\n<ul>\r\n    <li>to determine the effects of carburisation on tube integrity and life<\/li>\r\n    <li>to predict the safe remaining life of the tubes<\/li>\r\n<\/ul>\r\n<p><strong>Approach:<\/strong><\/p>\r\n<ul>\r\n    <li>post-exposure rupture testing of tubes having a range of carburisation depths, including comparative tests on samples with the carburised material removed<\/li>\r\n    <li><a href=\"http:\/\/johnbrear-plantintegrity.com\/?page_id=31\">probabilistic life assessment<\/a>, following our standard method.<\/li>\r\n<\/ul>\r\n<figure id=\"attachment_1025\" aria-describedby=\"caption-attachment-1025\" style=\"width: 476px\" class=\"wp-caption alignright\"><img decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Carburisation-graph.gif\" alt=\"\" width=\"476\" height=\"276\" class=\"size-full wp-image-1025\" \/><figcaption id=\"caption-attachment-1025\" class=\"wp-caption-text\">Effect of carburisation on creep rupture life<\/figcaption><\/figure>\r\n<p><strong>Results:<\/strong><\/p>\r\n<ul>\r\n    <li>Effect of through-wall carburisation on post-exposure test life determined, for three typical tube materials<\/li>\r\n    <li>In the early stages of service life this strengthening effect dominates.  Later, the accompanying loss of ductility leads to cracking of the carburised layer and a reduction in life.<\/li>\r\n<\/ul>\r\n<p><strong>Benefits:<\/strong><\/p>\r\n<ul>\r\n    <li>Quantified model of the strengthening and weakening effects of carburisation<\/li>\r\n    <li>Database of in-service carburisation rates<\/li>\r\n    <li>Database of mechanical properties of carburised tube materials<\/li>\r\n    <li>A validated, improved method of heater tube life prediction<\/li>\r\n<\/ul>\r\n<p><strong>Publication:<\/strong><\/p>\r\n<p>Brear, J.M. and Williamson, J.<br \/>\r\n\u201cIntegrity and life assessment of catalytic reformer units\u201d<br \/>\r\nChapter 2 of  EFC Publication 42 \u2018Corrosion in Refineries\u2019, eds Harston, J.D., Ropital, F.<br \/>\r\nInst Materials, Minerals and Mining, London, July 2007,  pp 18-46<\/p>\r\n<p>Franks, A.R., Bagnall, S.L., Brear, J.M., Williamson, J., Conlin, P. Reid, G.<br \/>\r\n\u201cCarburization and Metal Dusting in Fired Heaters and Steam Methane Reformers: <br \/>\r\nPlant Integrity Issues\u201d<br \/>\r\nNACE \u2013 AWS Conf. \u2018Materials Performance and Welding Technologies\u2019<br \/>\r\nDammam, Kingdom of Saudi Arabia, 11-14 September 2017<\/p>\r\n<p><br \/>\r\n&#160;<\/p>","protected":false},"excerpt":{"rendered":"<p>Component: 9CrMo tubes in a Platformer heater, with severe internal carburisation that had led to cracking and spalling of the carburised layer Objective: to determine the effects of carburisation on tube integrity and life to predict the safe remaining life of the tubes Approach: post-exposure rupture testing of tubes having a range of carburisation depths, &hellip; <a href=\"https:\/\/johnbrear-plantintegrity.com\/?page_id=1020\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">The effect of carburisation on heater tube life<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":155,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1020","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/1020","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=1020"}],"version-history":[{"count":10,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/1020\/revisions"}],"predecessor-version":[{"id":1022,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/1020\/revisions\/1022"}],"up":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/155"}],"wp:attachment":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}