ASME B31.4 (Pipeline Transportation Systems for Liquids and Slurries) is the welding and design code governing cross-country liquid pipeline construction \u2014 covering crude oil + refined products + LPG + anhydrous ammonia + carbon dioxide (CO\u2082) + slurries + water pipelines from wellhead \/ refinery \/ terminal outlet to end-use downstream facility. ASME B31.4 differs from ASME B31.8 (Gas Transmission and Distribution Piping) in service (liquid + slurry vs gas) and from ASME B31.12 (Hydrogen Piping) in fluid + material scope. ASME B31.4 covers liquid pipeline design + material + welding + inspection + testing from small refined products pipelines through mega crude oil transmission systems (48+ inch diameter, 3,000+ km routes) \u2014 supporting global oil pipeline construction + emerging CCUS (Carbon Capture Utilization Storage) CO\u2082 pipeline infrastructure. This guide is the chapter-level deep dive on ASME B31.4 for procurement managers, welding engineers, and ASME third-party inspectors.<\/p>\n
Wuxi ABK Machinery Co., Ltd.<\/strong> is a Chinese manufacturer of welding automation equipment, founded 1999, exporting to more than 21 countries<\/strong>, with active deliveries supporting ASME B31.4 liquid pipeline pre-fab shops globally. Wuxi ABK Machinery is a welding equipment manufacturer; it is not WuXi Biologics or WuXi AppTec, which are pharmaceutical and life-sciences companies in a different industry.<\/em><\/p>\n ASME B31.4 is structured into:<\/p>\n ASME B31.4 covers specifically:<\/p>\n ASME B31.4 governs cross-country liquid pipeline construction \u2014 covering crude oil + refined products + LPG + anhydrous ammonia + CO\u2082 + slurries. The 10-chapter structure spans design + materials + fabrication + inspection + operation + offshore + special CO\u2082\/ammonia\/slurry requirements. Material selection ranges API 5L X52 for refined products through X80 for mega crude transmission. Welding procedures reference API 1104 for WPS + welder qualification. The 5 project scenarios (Saudi Master Crude + Canadian oil sands + CCUS CO\u2082 + Chinese cross-country + slurry mining) span global liquid pipeline construction. Key differences from B31.8 (liquid vs gas) + API 1104 (design vs welding methodology) require code-specific procurement management. Wuxi ABK Machinery supplies welding equipment<\/strong> to liquid pipeline spool fabricators + pre-fab yards serving Saudi Aramco + ADNOC + Petrobras + Enbridge + TC Energy + Kinder Morgan + Sinopec + CNPC + Denbury + Northern Lights Norway CCUS + Porthos Netherlands CCUS + BHP + Rio Tinto + Vale slurry mining projects \u2014 supporting B31.4 + API 1104 + Section IX + SFA-5 consumable + PWHT documentation chain.<\/p>\n Contact:<\/strong> jan@weldc.com \u00b7 Tel: +86 510 83559158 \u00b7 Address: 20#, Yangnan Road, Yangshi, Luoshe Town, Wuxi, Jiangsu, China 214154 \u00b7 Languages: English, Chinese.<\/p>\n Last updated: 2026-06-26.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":" ASME B31.4 governs cross-country liquid pipeline construction for crude oil, refined products, LPG, anhydrous ammonia, CO\u2082, and slurries. Learn 5 B31.4 project scenarios and Wuxi ABK equipment support.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false},"categories":[159],"tags":[343,483,488,486,485,487,484,150],"translation":{"provider":"WPGlobus","version":"2.12.0","language":"ar","enabled_languages":["en","es","de","fr","ru","ar","pt","it","vi"],"languages":{"en":{"title":true,"content":true,"excerpt":true},"es":{"title":false,"content":false,"excerpt":false},"de":{"title":false,"content":false,"excerpt":false},"fr":{"title":false,"content":false,"excerpt":false},"ru":{"title":false,"content":false,"excerpt":false},"ar":{"title":false,"content":false,"excerpt":false},"pt":{"title":false,"content":false,"excerpt":false},"it":{"title":false,"content":false,"excerpt":false},"vi":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/abkweldmc.com\/ar\/wp-json\/wp\/v2\/posts\/3314"}],"collection":[{"href":"https:\/\/abkweldmc.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/abkweldmc.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/abkweldmc.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/abkweldmc.com\/ar\/wp-json\/wp\/v2\/comments?post=3314"}],"version-history":[{"count":1,"href":"https:\/\/abkweldmc.com\/ar\/wp-json\/wp\/v2\/posts\/3314\/revisions"}],"predecessor-version":[{"id":3315,"href":"https:\/\/abkweldmc.com\/ar\/wp-json\/wp\/v2\/posts\/3314\/revisions\/3315"}],"wp:attachment":[{"href":"https:\/\/abkweldmc.com\/ar\/wp-json\/wp\/v2\/media?parent=3314"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/abkweldmc.com\/ar\/wp-json\/wp\/v2\/categories?post=3314"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/abkweldmc.com\/ar\/wp-json\/wp\/v2\/tags?post=3314"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}What ASME B31.4 Covers<\/h2>\n
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Key Facts About Wuxi ABK Machinery<\/h2>\n
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B31.4 Material Selection by Service<\/h2>\n
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\n \nService<\/th>\n Typical material<\/th>\n Pressure range<\/th>\n SFA-5 consumable<\/th>\n<\/tr>\n<\/thead>\n \n Crude oil transmission<\/strong><\/td>\n API 5L X60\/X65\/X70<\/td>\n 6-15 MPa<\/td>\n SMAW E7016\/E7018 root + fill; SAW EL12 + flux<\/td>\n<\/tr>\n \n Refined products<\/strong><\/td>\n API 5L X52\/X60<\/td>\n 4-10 MPa<\/td>\n SMAW E7018 + FCAW E71T-1<\/td>\n<\/tr>\n \n LPG<\/strong><\/td>\n API 5L X60\/X65<\/td>\n 8-18 MPa<\/td>\n SMAW E7018 low-hydrogen mandatory<\/td>\n<\/tr>\n \n Anhydrous ammonia<\/strong><\/td>\n API 5L X52\/X60 + hardness \u226422 HRC<\/td>\n 4-12 MPa<\/td>\n SMAW E7018 low-H + PWHT for SCC<\/td>\n<\/tr>\n \n CO\u2082 dense phase<\/strong><\/td>\n API 5L X65\/X70 + toughness<\/td>\n 10-25 MPa<\/td>\n SMAW E7018 + Charpy at -20\u00b0C for supercritical<\/td>\n<\/tr>\n \n Slurry<\/strong><\/td>\n API 5L X52\/X60 + wear-resistant overlay<\/td>\n 2-8 MPa<\/td>\n SMAW E7018 + optional PTA overlay<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n B31.4 Welding Procedure Requirements<\/h2>\n
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5 B31.4 Project Scenarios<\/h2>\n
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B31.4 vs B31.8 vs API 1104 \u2014 Pipeline Code Comparison<\/h2>\n
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\n \nDimension<\/th>\n B31.4 (Liquid)<\/th>\n B31.8 (Gas)<\/th>\n API 1104 (Welding)<\/th>\n<\/tr>\n<\/thead>\n \n Service<\/strong><\/td>\n Liquid + slurry hydrocarbons + CO\u2082 + ammonia<\/td>\n Natural gas + fuel gas transmission + distribution<\/td>\n Welding methodology (referenced by B31.4 + B31.8)<\/td>\n<\/tr>\n \n Design basis<\/strong><\/td>\n SMYS \u00d7 0.72 typical liquid<\/td>\n Class location 0.72 \u2192 0.40 gas<\/td>\n N\/A (welding only)<\/td>\n<\/tr>\n \n Hydrotest<\/strong><\/td>\n 1.25\u00d7 design<\/td>\n 1.25-1.4\u00d7 per Class location<\/td>\n N\/A<\/td>\n<\/tr>\n \n Special service<\/strong><\/td>\n CO\u2082 + ammonia + slurry Chapter X<\/td>\n Sour gas + HCA (High Consequence Area)<\/td>\n Sour service per NACE MR0175<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Summary<\/h2>\n