{"id":7175,"date":"2026-09-29T16:58:12","date_gmt":"2026-09-29T14:58:12","guid":{"rendered":"https:\/\/www.tommasinfondi.it\/?p=7175"},"modified":"2026-09-29T16:57:06","modified_gmt":"2026-09-29T14:57:06","slug":"welded-ellipsoidal-heads-prt-asme-viii-div-1","status":"publish","type":"post","link":"https:\/\/www.tommasinfondi.it\/en\/welded-ellipsoidal-heads-prt-asme-viii-div-1\/","title":{"rendered":"Welded SA-516 Grade 70N Ellipsoidal Heads with PRT-ASME VIII Div.1 Certification: a 4,200 mm Oil &#038; Gas Project"},"content":{"rendered":"\n<p>One of Tommasin Fondi&#8217;s recent technically demanding projects involved the <strong>manufacture of four welded ellipsoidal heads in SA-516 Grade 70N carbon steel<\/strong>, each with a diameter of 4,200 mm and a final thickness of 20 mm after forming, for a major Oil &amp; Gas project.<br>The order required specific manufacturing capabilities for large-diameter components, together with compliance with the requirements associated with <strong>PRT ASME VIII Div.1 certification<\/strong> and the management of the relevant project documentation.<\/p>\n\n\n\n<h3 id=\"h-project-at-a-glance\">Project at a glance<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Specification<\/strong><\/td><td><strong>Project data<\/strong><\/td><\/tr><tr><td>Quantity<\/td><td>4 heads<\/td><\/tr><tr><td>Head geometry<\/td><td>Welded ellipsoidal heads<\/td><\/tr><tr><td>Material<\/td><td>SA-516 Grade 70N carbon steel<\/td><\/tr><tr><td>Diameter<\/td><td>4,200 mm<\/td><\/tr><tr><td>Final thickness<\/td><td>20 mm after forming<\/td><\/tr><tr><td>Industry<\/td><td>Oil &amp; Gas<\/td><\/tr><tr><td>Certification requirement<\/td><td>PRT ASME VIII Div.1<\/td><\/tr><tr><td>Documentation<\/td><td>Partial Data Report management<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 id=\"h-welded-ellipsoidal-heads-for-oil-gas-applications\">Welded ellipsoidal heads for Oil &amp; Gas applications<\/h3>\n\n\n\n<p>The Oil &amp; Gas industry requires components capable of providing reliable operation under particularly demanding service conditions. Pressure vessels, separators, process tanks and equipment for energy plants must meet stringent quality and regulatory requirements.<\/p>\n\n\n\n<p>The four heads manufactured by Tommasin are part of the company&#8217;s<strong><a href=\"https:\/\/www.tommasinfondi.it\/en\/products\/dished-heads\/\"> production of dished heads<\/a><\/strong> for highly specialised industrial applications. In this project, the combination of ellipsoidal geometry, SA-516 Grade 70N carbon steel, large dimensions and welded construction made the order particularly demanding from a manufacturing perspective.<\/p>\n\n\n\n<p>For applications requiring this specific geometry, Tommasin also manufactures according to <strong>ASME requirements<\/strong>, with dimensional characteristics defined according to the specific requirements of each project.<\/p>\n\n\n\n<h3 id=\"h-manufacturing-4-200-mm-welded-dished-heads\">Manufacturing 4,200 mm welded dished heads<\/h3>\n\n\n\n<p>Producing <strong>welded ellipsoidal heads with a diameter of 4,200 mm<\/strong> and a final thickness of 20 mm after forming requires careful planning throughout the different stages of the manufacturing process.<\/p>\n\n\n\n<p>Components of this size involve significant material masses, complex handling operations and the use of dedicated equipment. These requirements are combined with the specific demands of forming and subsequent welding operations.<\/p>\n\n\n\n<p>Correct execution of the different manufacturing stages therefore requires not only suitable production equipment, but also personnel with specific experience in the manufacture of large-diameter heads.<\/p>\n\n\n\n<h3 id=\"h-prt-asme-viii-div-1-certification-and-documentation-management\">PRT ASME VIII Div.1 certification and documentation management<\/h3>\n\n\n\n<p>One of the central requirements of this order was compliance with the requirements associated with PRT ASME VIII Div.1 certification.<\/p>\n\n\n\n<p>Tommasin holds international certifications related to manufacturing for pressure equipment applications; further information is available in the section dedicated to <strong><a href=\"https:\/\/www.tommasinfondi.it\/en\/certifications\/\">Tommasin certifications<\/a><\/strong>.<\/p>\n\n\n\n<p>For this specific supply, the manufacturing activities were also accompanied by <strong>Partial Data Report management<\/strong>, a documentation requirement expressly included within the scope of the project.<\/p>\n\n\n\n<p>The relationship between large dimensions, welded construction and ASME requirements has also been addressed by Tommasin in its technical article dedicated to <strong><a href=\"https:\/\/www.tommasinfondi.it\/en\/large-dished-heads-and-asme-u-stamp-certification-not-only-an-international-standard\/\">large dished heads and ASME U-Stamp certification.<\/a><\/strong><\/p>\n\n\n\n<h3 id=\"h-from-material-preparation-to-final-inspection\">From material preparation to final inspection<\/h3>\n\n\n\n<p>Tommasin Fondi&#8217;s experience in the manufacture of dished heads made it possible to manage the different stages of the order, from material preparation and forming through to welding operations and the final inspections required by the applicable specifications.<\/p>\n\n\n\n<p>The accuracy of the manufacturing operations and the controls carried out throughout the production process made it possible to manufacture the four heads according to the customer&#8217;s specifications.<\/p>\n\n\n\n<p>This project therefore provides a practical example of Tommasin&#8217;s ability to manage supplies in which <strong>large dimensions, carbon steel, ellipsoidal geometries, welded construction and PRT ASME VIII Div.1 requirements <\/strong>must be handled within a single project.<\/p>\n\n\n\n<h3 id=\"h-welded-heads-for-pressure-vessels-and-international-projects\">Welded heads for pressure vessels and international projects<\/h3>\n\n\n\n<p>Since 1978, Tommasin Fondi has been manufacturing heads for companies producing vessels, tanks and industrial equipment, combining its production capabilities with the technical and documentation support required for different types of projects.<\/p>\n\n\n\n<p>The <strong>manufacture of the four SA-516 Grade 70N welded ellipsoidal heads<\/strong>, with a diameter of 4,200 mm, for the Oil &amp; Gas sector is a practical example of this experience applied to a technically demanding supply.<\/p>\n\n\n\n<p>For projects involving welded heads, <strong>large-diameter heads or supplies subject to ASME requirements, customers can submit their technical specifications<\/strong> to Tommasin and <strong><a href=\"https:\/\/www.tommasinfondi.it\/en\/offer\/\">request a technical quotation<\/a><\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>One of Tommasin Fondi&#8217;s recent technically demanding projects involved the manufacture of four welded ellipsoidal heads in SA-516 Grade 70N carbon steel, each with a diameter of 4,200 mm and a final thickness of 20 mm after forming, for a major Oil &amp; Gas project.The order required specific manufacturing capabilities for large-diameter components, together with &hellip; <a href=\"https:\/\/www.tommasinfondi.it\/en\/welded-ellipsoidal-heads-prt-asme-viii-div-1\/\">Continued<\/a><\/p>\n","protected":false},"author":11,"featured_media":7177,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":[],"categories":[244],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v16.8 (Yoast SEO v16.8) - 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