{"id":69644,"date":"2026-05-17T17:27:23","date_gmt":"2026-05-17T17:27:23","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/api-6a\/"},"modified":"2026-05-19T15:30:09","modified_gmt":"2026-05-19T15:30:09","slug":"api-6a","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/api-6a\/","title":{"rendered":"API 6A"},"content":{"rendered":"<h2>Technical Standards and Specifications for API 6A Wellhead Equipment<\/h2>\n<h3>Purpose and Scope<\/h3>\n<p>The international API 6A specification regulates critical requirements for the design, manufacturing, and operational performance of wellhead and Christmas tree equipment used in the oil and gas sector. The document establishes rigorous standards for geometric parameters, structural features, material selection, non-destructive testing methods, welding processes, marking procedures, and logistics rules. EV Group China specialists adhere to these regulations to ensure full interchangeability and reliability of components under extreme operating conditions.<\/p>\n<p>It is important to note that the scope of this standard is limited to factory manufacturing and acceptance conditions and does not apply to field repair processes, field testing, or operational servicing of equipment at the well site.<\/p>\n<h3>Nomenclature of Equipment according to API 6A<\/h3>\n<p>The specification covers a wide range of assemblies supplied by EV Group China:<\/p>\n<p><strong>Wellhead components:<\/strong><\/p>\n<ul>\n<li>Casing head housings and spools;<\/li>\n<li>Tubing head spools;<\/li>\n<li>Adapter spools and multi-stage head systems.<\/li>\n<\/ul>\n<p><strong>Connecting elements and fittings:<\/strong><\/p>\n<ul>\n<li>Adapters and top connectors;<\/li>\n<li>Tees and crosses (block and forged);<\/li>\n<li>Sampling systems and spacer spools.<\/li>\n<\/ul>\n<p><strong>Casing hangers:<\/strong><\/p>\n<ul>\n<li>Mandrel and slip hanger assemblies.<\/li>\n<\/ul>\n<p><strong>Valves and chokes:<\/strong><\/p>\n<ul>\n<li>Single-bore and multi-bore valves;<\/li>\n<li>Power-actuated valves and valves prepared for actuators;<\/li>\n<li>Check valves;<\/li>\n<li>Christmas tree chokes and backpressure regulators;<\/li>\n<li>Safety systems for subsea and surface installations.<\/li>\n<\/ul>\n<p><strong>End connectors:<\/strong><\/p>\n<ul>\n<li>Flanged, threaded, and welded connections (OEC);<\/li>\n<li>Blind flanges and spacer bushings.<\/li>\n<\/ul>\n<p><strong>Auxiliary equipment:<\/strong><\/p>\n<ul>\n<li>Actuators, sealing bushings, and ring gaskets;<\/li>\n<li>Running and testing tools (according to Annex H).<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"\/image\/catalog\/wiki\/flange\/risunok1.png\" alt=\"API 6A wellhead equipment diagram\" title=\"Wellhead equipment\"><\/p>\n<p>Typical equipment configurations are shown in the diagrams (Figures 1 and 2). All EV Group China products comply with metric standards or US specifications (Annex B).<\/p>\n<h3>Operating Parameters and Classification<\/h3>\n<p>The API 6A standard classifies equipment based on pressure limits, temperature ranges, and material classes intended for operation in harsh wellbore environments. Material selection is based on operating conditions, which guarantees the durability and safety of the infrastructure.<\/p>\n<h3>Product Specification Levels (PSL)<\/h3>\n<p>To ensure quality control, API 6A introduces 5 Product Specification Levels (PSL). These levels define the depth of technical requirements for materials, testing methods, and quality documentation. EV Group China specialists will help select the optimal PSL level depending on project complexity and safety requirements (according to the guide in Annex A).<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[111],"class_list":["post-69644","wiki","type-wiki","status-publish","hentry","wiki_category-api"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69644","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69644\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69644"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69644"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}