{"id":1057,"date":"2019-01-22T23:49:09","date_gmt":"2019-01-22T23:49:09","guid":{"rendered":"http:\/\/johnbrear-plantintegrity.com\/?page_id=1057"},"modified":"2019-01-22T23:49:41","modified_gmt":"2019-01-22T23:49:41","slug":"fitness-for-service-of-fire-damaged-headers","status":"publish","type":"page","link":"https:\/\/johnbrear-plantintegrity.com\/?page_id=1057","title":{"rendered":"Fitness for service of fire-damaged headers"},"content":{"rendered":"<p><strong>Item:<\/strong><\/p>\r\n<ul>\r\n    <li>Radiant section headers fabricated from Type 347H and operating at 650\u00b0C  in a UOP charge heater in the USA<\/li>\r\n<\/ul>\r\n<p><strong>Problem:<\/strong><\/p>\r\n<ul>\r\n    <li>Following a fire in the heater, two through wall cracks and severe bulging were found in the headers.  Initial impressions were that the condition was not fully compatible with fire damage<\/li>\r\n<\/ul>\r\n<p><strong>Objective:<\/strong><\/p>\r\n<ul>\r\n    <li>To determine the cause of the  cracking and bulging<\/li>\r\n    <li>To assess whether the headers would be fit for service following repair<\/li>\r\n<\/ul>\r\n<p><strong>Approach:<\/strong><\/p>\r\n<ul>\r\n    <li>Removal of header containing cracks and worst bulges, for detailed examination<\/li>\r\n    <li>Site inspection of all top headers<\/li>\r\n    <li>Failure analysis to determine the root cause of the cracking<\/li>\r\n    <li>Fitness for service assessment of repaired headers<\/li>\r\n<\/ul>\r\n<p><strong>Findings:<\/strong><\/p>\r\n<ul>\r\n    <li>Site inspection revealed damage to be confined to areas around supports<\/li>\r\n    <li>Metallurgical examination of undamaged header indicated significant remaining life.<\/li>\r\n    <li>Examination of cracks and bulges reveal surface cracking on both the internal and external surfaces<\/li>\r\n    <li>Metallographic examination revealed the internal cracks to be due to creep, but the external cracks to be due to thermal fatigue<\/li>\r\n    <li>Failure demonstrated to be as a result of the ingress of large quantities of rainwater through the insulation boxes onto the hot headers around the support system<\/li>\r\n    <li>Full UT inspection reveals remaining header to be free of internal and external defects<\/li>\r\n<\/ul>\r\n<p><strong>Benefits:<\/strong><\/p>\r\n<ul>\r\n    <li>Identification of the root cause of the problem<\/li>\r\n    <li>Assurance that the repaired header could be safely returned to service<\/li>\r\n    <li>Refurbishment of the insulation boxes eliminated the source of the rainwater ingress<br \/>\r\n    <\/li>\r\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Item: Radiant section headers fabricated from Type 347H and operating at 650\u00b0C in a UOP charge heater in the USA Problem: Following a fire in the heater, two through wall cracks and severe bulging were found in the headers. Initial impressions were that the condition was not fully compatible with fire damage Objective: To determine &hellip; <a href=\"https:\/\/johnbrear-plantintegrity.com\/?page_id=1057\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Fitness for service of fire-damaged headers<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":155,"menu_order":6,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1057","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/1057","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=1057"}],"version-history":[{"count":1,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/1057\/revisions"}],"predecessor-version":[{"id":1058,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/1057\/revisions\/1058"}],"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=1057"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}