{"id":411,"date":"2022-01-10T20:57:08","date_gmt":"2022-01-10T21:57:08","guid":{"rendered":"https:\/\/pipelineng.com\/?page_id=411"},"modified":"2022-01-10T20:57:56","modified_gmt":"2022-01-10T21:57:56","slug":"mechanical-design-wall-thickness-material-grade","status":"publish","type":"page","link":"https:\/\/pedoffshore.com\/index.php\/mechanical-design-wall-thickness-material-grade\/","title":{"rendered":"Mechanical design (Wall Thickness &#038; Material Grade)"},"content":{"rendered":"\n<p><strong>Wall Thickness Analysis for Offshore Pipelines<\/strong><\/p>\n\n\n\n<p>The offshore pipelines and risers wall thickness is assessed against the following possible modes of failure based on subsea pipeline design code:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u00a0\u00a0Hoop stress (pressure containment)<\/li><li>\u00a0\u00a0Collapse due to external pressure<\/li><li>\u00a0\u00a0Buckle initiation<\/li><li>\u00a0\u00a0Buckle propagation<\/li><li>\u00a0\u00a0Buckle initiation<\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"375\" height=\"298\" src=\"https:\/\/pipelineng.com\/wp-content\/uploads\/Picture8.png\" alt=\"\" class=\"wp-image-412\" srcset=\"https:\/\/pedoffshore.com\/wp-content\/uploads\/Picture8.png 375w, https:\/\/pedoffshore.com\/wp-content\/uploads\/Picture8-300x238.png 300w\" sizes=\"auto, (max-width: 375px) 100vw, 375px\" \/><\/figure><\/div>\n\n\n\n<p>As part of the detailed engineering design, preliminary pipelay and installation analyses should be carried out to further confirm the acceptability of the selected wall thickness and material grade.<\/p>\n\n\n\n<p><strong>Wall Thickness Analysis for Onshore Pipelines<\/strong><\/p>\n\n\n\n<p>The onshore pipelines is assessed against the Hoop stress (pressure containment) based on ASME 31.8 for the gas transmission pipelines and ASME 31.4 for the liquid hydrocarbons pipelines.<\/p>\n\n\n\n<p>The wall thickness calculation is performed using an in-house program calculation sheet.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/pipelineng.com\/wp-content\/uploads\/Picture10.png\" alt=\"\" class=\"wp-image-417\" width=\"389\" height=\"287\" srcset=\"https:\/\/pedoffshore.com\/wp-content\/uploads\/Picture10.png 350w, https:\/\/pedoffshore.com\/wp-content\/uploads\/Picture10-300x221.png 300w\" sizes=\"auto, (max-width: 389px) 100vw, 389px\" \/><\/figure><\/div>\n\n\n\n<p><strong>Material Grade Selection<\/strong><\/p>\n\n\n\n<p>The steels applied in the offshore oil and gas industry vary from carbon steels (taken from American Petroleum Institute standards- Grade B to Grade X 70 and higher) to exotic steels(i.e. duplex).<\/p>\n\n\n\n<p>The following factors are to be considered in the selection of material grades:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u00a0Cost;<\/li><li>\u00a0Resistance to corrosion effects;<\/li><li>\u00a0Weight requirement;<\/li><li>\u00a0Weldability<\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/pipelineng.com\/wp-content\/uploads\/Picture9-2.jpg\" alt=\"\" class=\"wp-image-418\" width=\"783\" height=\"440\" srcset=\"https:\/\/pedoffshore.com\/wp-content\/uploads\/Picture9-2.jpg 690w, https:\/\/pedoffshore.com\/wp-content\/uploads\/Picture9-2-300x169.jpg 300w\" sizes=\"auto, (max-width: 783px) 100vw, 783px\" \/><\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Wall Thickness Analysis for Offshore Pipelines The offshore pipelines and risers wall thickness is assessed against the following possible modes of failure based on subsea pipeline design code: \u00a0\u00a0Hoop stress (pressure containment) \u00a0\u00a0Collapse due to external pressure \u00a0\u00a0Buckle initiation \u00a0\u00a0Buckle propagation \u00a0\u00a0Buckle initiation As part of the detailed engineering design, preliminary pipelay and installation analyses<a class=\"read-more\" href=\"https:\/\/pedoffshore.com\/index.php\/mechanical-design-wall-thickness-material-grade\/\"><br \/>-> Continue reading<span class=\"screen-reader-text\">  Mechanical design (Wall Thickness &#038; Material Grade)<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-411","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/pedoffshore.com\/index.php\/wp-json\/wp\/v2\/pages\/411","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pedoffshore.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pedoffshore.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pedoffshore.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pedoffshore.com\/index.php\/wp-json\/wp\/v2\/comments?post=411"}],"version-history":[{"count":2,"href":"https:\/\/pedoffshore.com\/index.php\/wp-json\/wp\/v2\/pages\/411\/revisions"}],"predecessor-version":[{"id":419,"href":"https:\/\/pedoffshore.com\/index.php\/wp-json\/wp\/v2\/pages\/411\/revisions\/419"}],"wp:attachment":[{"href":"https:\/\/pedoffshore.com\/index.php\/wp-json\/wp\/v2\/media?parent=411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}