{"id":746,"date":"2019-01-17T00:49:58","date_gmt":"2019-01-17T00:49:58","guid":{"rendered":"http:\/\/johnbrear-plantintegrity.com\/?page_id=746"},"modified":"2019-01-17T01:03:14","modified_gmt":"2019-01-17T01:03:14","slug":"hp-rotor-and-casing-cracks","status":"publish","type":"page","link":"https:\/\/johnbrear-plantintegrity.com\/?page_id=746","title":{"rendered":"HP rotor and casing cracks"},"content":{"rendered":"<p><figure id=\"attachment_747\" aria-describedby=\"caption-attachment-747\" style=\"width: 439px\" class=\"wp-caption alignright\"><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/hpcasingcrack.jpg\" alt=\"\" width=\"439\" height=\"297\" class=\"size-full wp-image-747\" srcset=\"https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/hpcasingcrack.jpg 439w, https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/hpcasingcrack-300x203.jpg 300w\" sizes=\"(max-width: 439px) 100vw, 439px\" \/><figcaption id=\"caption-attachment-747\" class=\"wp-caption-text\">HP casing crack<\/figcaption><\/figure><strong>Plant:<\/strong><\/p>\r\n<ul>\r\n    <li>Coal-fired, 4 x 550MW power station, located in the UK<\/li>\r\n<\/ul>\r\n<p><strong>Problem:<\/strong><\/p>\r\n<ul>\r\n    <li>Routine inspection revealed external cracking, typical of thermal fatigue, at the rotor inlet and internal cracking on the 200mm thick casing<\/li>\r\n<\/ul>\r\n<p><strong>Approach:<\/strong><\/p>\r\n<ul>\r\n    <li>Thermal stress analysis and fracture mechanics assessment<\/li>\r\n<\/ul>\r\n<p><strong>Benefits:<\/strong><\/p>\r\n<ul>\r\n    <li>Transient thermal stress distributions defined<\/li>\r\n    <li>Coincidence of defects with high-stress locations confirmed<\/li>\r\n    <li>Crack arrest predicted in the casing<\/li>\r\n    <li>Insufficient life predicted for the rotor under current operational conditions<\/li>\r\n    <li>A slower start-up procedure developed to reduce crack growth rates to a tolerable level<br \/>\r\n    <\/li>\r\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Plant: Coal-fired, 4 x 550MW power station, located in the UK Problem: Routine inspection revealed external cracking, typical of thermal fatigue, at the rotor inlet and internal cracking on the 200mm thick casing Approach: Thermal stress analysis and fracture mechanics assessment Benefits: Transient thermal stress distributions defined Coincidence of defects with high-stress locations confirmed Crack &hellip; <a href=\"https:\/\/johnbrear-plantintegrity.com\/?page_id=746\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">HP rotor and casing cracks<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":169,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-746","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/746","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=746"}],"version-history":[{"count":1,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/746\/revisions"}],"predecessor-version":[{"id":748,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/746\/revisions\/748"}],"up":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/169"}],"wp:attachment":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}