{"id":942,"date":"2019-01-21T11:38:51","date_gmt":"2019-01-21T11:38:51","guid":{"rendered":"http:\/\/johnbrear-plantintegrity.com\/?page_id=942"},"modified":"2019-01-21T21:24:55","modified_gmt":"2019-01-21T21:24:55","slug":"defects-in-a-platformer-vessel","status":"publish","type":"page","link":"https:\/\/johnbrear-plantintegrity.com\/?page_id=942","title":{"rendered":"Defects in a Platformer vessel"},"content":{"rendered":"<figure id=\"attachment_944\" aria-describedby=\"caption-attachment-944\" style=\"width: 376px\" class=\"wp-caption alignright\"><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Boat-sample.jpg\" alt=\"\" width=\"376\" height=\"200\" class=\"size-full wp-image-944\" srcset=\"https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Boat-sample.jpg 836w, https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Boat-sample-300x160.jpg 300w, https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Boat-sample-768x409.jpg 768w\" sizes=\"(max-width: 376px) 100vw, 376px\" \/><figcaption id=\"caption-attachment-944\" class=\"wp-caption-text\">Cross section of boat sample<\/figcaption><\/figure>\r\n<p><strong>Component:<\/strong><\/p>\r\n<ul>\r\n    <li>Platformer vessel fabricated from 1\u00bcCr\u00bdMo steel, with a history of internal and external cracking in weld and HAZ material<\/li>\r\n    <li>The largest defect currently detected is known to be associated with low chromium levels in the inner part of the weld metal<\/li>\r\n<\/ul>\r\n<p><strong>Objective:<\/strong><\/p>\r\n<ul>\r\n    <li>To determine whether the vessel is fit to continue in service, to the satisfaction of the regulatory authorities<\/li>\r\n<\/ul>\r\n<figure id=\"attachment_947\" aria-describedby=\"caption-attachment-947\" style=\"width: 376px\" class=\"wp-caption alignright\"><img decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Platformer-crack.jpg\" alt=\"\" width=\"376\" height=\"290\" class=\"size-full wp-image-947\" srcset=\"https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Platformer-crack.jpg 659w, https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/Platformer-crack-300x232.jpg 300w\" sizes=\"(max-width: 376px) 100vw, 376px\" \/><figcaption id=\"caption-attachment-947\" class=\"wp-caption-text\">Detail of crack<\/figcaption><\/figure>\r\n<p><strong>Approach:<\/strong><\/p>\r\n<ul>\r\n    <li>Review of previous inspection reports and defect assessments<\/li>\r\n    <li>Consideration of the susceptibility of both standard and sub-standard weld metals to hydrogen attack, in conformity with API RP540<\/li>\r\n    <li>Fracture mechanics calculations compatible with API RP579, using an ultra-conservative 16\" long half-wall defect, so as to obviate the need to determine properties of the sub-standard inner weld metal<\/li>\r\n    <li>Allowance on fracture toughness and crack growth rates made for the effects of the hydrogen environment<\/li>\r\n    <li>Allowance made for weld residual stresses<\/li>\r\n    <li>Sensitivity analysis to variation in operating conditions<\/li>\r\n<\/ul>\r\n<p><strong>Benefits:<\/strong><\/p>\r\n<ul>\r\n    <li>Leak-before-break demonstrated<\/li>\r\n    <li>Critical defect sizes determined, based on normal operation and on all credible fault conditions<\/li>\r\n    <li>Failure times by crack growth, from the mid-wall position outwards, determined for current and design operating conditions<\/li>\r\n    <li>Safe operating temperature limits specified to allow operation for a further 30,000h<\/li>\r\n    <li>Safe operating practices specified for pressurisation and cool-down<\/li>\r\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Component: Platformer vessel fabricated from 1\u00bcCr\u00bdMo steel, with a history of internal and external cracking in weld and HAZ material The largest defect currently detected is known to be associated with low chromium levels in the inner part of the weld metal Objective: To determine whether the vessel is fit to continue in service, to &hellip; <a href=\"https:\/\/johnbrear-plantintegrity.com\/?page_id=942\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Defects in a Platformer vessel<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":157,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-942","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/942","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=942"}],"version-history":[{"count":4,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/942\/revisions"}],"predecessor-version":[{"id":945,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/942\/revisions\/945"}],"up":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/157"}],"wp:attachment":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=942"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}