{"id":1403,"date":"2025-12-09T09:04:51","date_gmt":"2025-12-09T09:04:51","guid":{"rendered":"https:\/\/stvvalve.com\/?p=1403"},"modified":"2025-12-09T09:04:51","modified_gmt":"2025-12-09T09:04:51","slug":"understanding-api-600-and-api-598-and-their-differences","status":"publish","type":"post","link":"https:\/\/stvvalve.com\/es\/understanding-api-600-and-api-598-and-their-differences\/","title":{"rendered":"Understanding API 600 and API 598 and Their Differences"},"content":{"rendered":"<div class=\"auto-hide-last-sibling-br paragraph-pP9ZLC paragraph-element br-paragraph-space\">API 600 and API 598 are two core standards published by the\u00a0<strong>American Petroleum Institute (API)<\/strong>\u00a0that apply to industrial valves, but they focus on distinct aspects of valve design, manufacturing, and quality control. Clarifying their scopes and differences is critical for ensuring valve compliance and reliable performance in oil and gas, petrochemical, and other high-pressure industrial applications.<\/div>\n<div>\n<div style=\"width: 810px\" class=\"wp-caption alignnone\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.stvvalves.com\/wp-content\/uploads\/2024\/12\/1500lb-lcc-gate-valve-6-inch-api600-rtj-end.jpg?resize=800%2C800&#038;ssl=1\" alt=\"1500LB API600 GATE VALVE\" width=\"800\" height=\"800\" \/><p class=\"wp-caption-text\">1500LB API600 GATE VALVE SUPPLIER<\/p><\/div>\n<\/div>\n<h2 class=\"header-iWP5WJ auto-hide-last-sibling-br\">1. Basic Overview of Each Standard<\/h2>\n<h3 class=\"header-iWP5WJ auto-hide-last-sibling-br\">1.1 <a href=\"https:\/\/www.stvvalves.com\/products\/1500lb-lcc-gate-valve-6-inch-api600-rtj-end\/\">API 600<\/a>:\u00a0<em>Steel Gate Valves\u2014Flanged and Butt-Welding Ends, NPS 1 Through 24<\/em><\/h3>\n<div class=\"auto-hide-last-sibling-br paragraph-pP9ZLC paragraph-element br-paragraph-space\">API 600 is a\u00a0<strong>product specification standard<\/strong>\u00a0that defines the minimum requirements for the design, manufacturing, material selection, marking, and performance of\u00a0<strong>rising-stem steel gate valves<\/strong>\u00a0used in petroleum and natural gas industries.<\/div>\n<div class=\"auto-hide-last-sibling-br paragraph-pP9ZLC paragraph-element br-paragraph-space\">Its core scope covers:<\/div>\n<ul class=\"auto-hide-last-sibling-br\">\n<li><strong>Valve type<\/strong>: Rising-stem gate valves with flanged or butt-welded end connections, ranging from NPS 1 to NPS 24 and pressure classes from Class 150 to Class 2500.<\/li>\n<li><strong>Design requirements<\/strong>: Dimensions (face-to-face, end-to-end), pressure-temperature ratings, body\/bonnet joint designs, stem and packing configurations, and fire-safe design criteria (to meet API 607 fire safety standards).<\/li>\n<li><strong>Material specifications<\/strong>: Mandatory material grades for valve bodies, bonnets, gates, seats, and stems (e.g., ASTM A216 WCB for carbon steel, ASTM A351 CF8M for stainless steel).<\/li>\n<li><strong>Manufacturing and marking<\/strong>: Requirements for machining tolerances, assembly processes, and permanent marking (valve size, pressure class, material, API monogram, etc.).<\/li>\n<\/ul>\n<h3 class=\"header-iWP5WJ auto-hide-last-sibling-br\">1.2 API 598:\u00a0<em>Valve Inspection and Testing<\/em><\/h3>\n<div class=\"auto-hide-last-sibling-br paragraph-pP9ZLC paragraph-element br-paragraph-space\">API 598 is a\u00a0<strong>quality verification standard<\/strong>\u00a0that specifies the mandatory inspection and testing procedures, acceptance criteria, and documentation requirements for\u00a0<strong>all types of industrial valves<\/strong>, including gate valves, check valves, globe valves, ball valves, and butterfly valves.<\/div>\n<div class=\"auto-hide-last-sibling-br paragraph-pP9ZLC paragraph-element br-paragraph-space\">Its core scope covers:<\/div>\n<ul class=\"auto-hide-last-sibling-br\">\n<li><strong>Inspection items<\/strong>: Visual inspection of valve components, dimensional verification (to match design drawings or standards like ASME B16.10), and verification of material certificates (MTRs).<\/li>\n<li><strong>Testing requirements<\/strong>: Hydrostatic shell tests, hydrostatic seat leakage tests, pneumatic tests (when applicable), and operational tests for valve opening\/closing performance.<\/li>\n<li><strong>Acceptance criteria<\/strong>: Permissible leakage rates for different valve types (metal-seated vs. soft-seated), pressure holding times, and limits for structural deformation or external leakage.<\/li>\n<li><strong>Documentation<\/strong>: Requirements for test reports, including valve identification, test parameters, results, and inspector certifications.<\/li>\n<\/ul>\n<h2 class=\"header-iWP5WJ auto-hide-last-sibling-br\">2. Key Differences Between API 600 and API 598<\/h2>\n<div class=\"auto-hide-last-sibling-br paragraph-pP9ZLC paragraph-element br-paragraph-space\">The two standards are complementary but not interchangeable. The following table summarizes their core differences:<\/div>\n<div class=\"auto-hide-last-sibling-br mdbox-table-root table-container-cYf_5N\" data-scroll-inline-overflow=\"false\" data-scroll-inline-at-start=\"true\" data-scroll-inline-start-overflow=\"false\" data-scroll-inline-at-end=\"true\" data-scroll-inline-end-overflow=\"false\">\n<div class=\"table-scroll-container-Gyf4hQ mdbox-table-scroll-container\">\n<table>\n<thead>\n<tr>\n<th><strong>Aspect<\/strong><\/th>\n<th><strong>API 600<\/strong><\/th>\n<th><strong>API 598<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Core Purpose<\/strong><\/td>\n<td>Defines design, material, and manufacturing requirements for\u00a0<strong>rising-stem steel gate valves<\/strong><\/td>\n<td>Defines inspection and testing procedures and acceptance criteria for\u00a0<strong>all industrial valves<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>Scope of Application<\/strong><\/td>\n<td>Limited to a single valve type (rising-stem steel gate valves, NPS 1\u201324)<\/td>\n<td>Universal to all valve types (gate, check, globe, ball, butterfly, etc.)<\/td>\n<\/tr>\n<tr>\n<td><strong>Nature of Standard<\/strong><\/td>\n<td>Product specification standard (design and manufacturing-focused)<\/td>\n<td>Quality assurance standard (inspection and testing-focused)<\/td>\n<\/tr>\n<tr>\n<td><strong>Key Requirements<\/strong><\/td>\n<td>Dimensions, materials, fire-safe design, marking, pressure-temperature ratings<\/td>\n<td>Test methods (hydrostatic\/pneumatic), leakage limits, holding times, test documentation<\/td>\n<\/tr>\n<tr>\n<td><strong>Compliance Objective<\/strong><\/td>\n<td>Ensures the valve is designed and built to meet industry performance standards<\/td>\n<td>Ensures the manufactured valve meets quality requirements and is free of defects<\/td>\n<\/tr>\n<tr>\n<td><strong>Relationship to Other Standards<\/strong><\/td>\n<td>References API 598 for mandatory testing requirements<\/td>\n<td>Can be referenced by other valve product standards (e.g., API 600, <a href=\"https:\/\/www.stvvalves.com\/products\/forged-astm-a182-f51-globe-valve-1-1-2-inch-800-lb-api-602-sw\/\">API 602<\/a>, <a href=\"https:\/\/www.stvvalves.com\/products\/900lb-swing-check-valve-14-inch-a216-wcb-api-6d-psb-bw\/\">API 6D<\/a>)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h2 class=\"header-iWP5WJ auto-hide-last-sibling-br\">3. Practical Application Relationship<\/h2>\n<div class=\"auto-hide-last-sibling-br paragraph-pP9ZLC paragraph-element br-paragraph-space\">In actual valve production and procurement, API 600 and API 598 are used together:<\/div>\n<ol class=\"auto-hide-last-sibling-br\">\n<li><strong>For manufacturers<\/strong>: When producing API 600-compliant gate valves, they must first follow API 600\u2019s design and material rules, then conduct inspection and testing per API 598 to verify product quality before shipment.<\/li>\n<li><strong>For buyers<\/strong>: When purchasing API 600 gate valves, the procurement specification should require compliance with both standards: the valve must meet API 600 design requirements, and the test report must be issued in accordance with API 598 criteria.<\/li>\n<li><strong>For third-party certification<\/strong>: Valves marked with the API monogram (e.g., API 600 monogram) must pass tests per API 598 to demonstrate compliance.<\/li>\n<\/ol>\n<h2 class=\"header-iWP5WJ auto-hide-last-sibling-br\">4. Common Misunderstandings<\/h2>\n<ul class=\"auto-hide-last-sibling-br\">\n<li><strong>Myth 1<\/strong>: API 600 includes testing requirements.\n<div class=\"container-Uxvbjy md-box-line-break wrapper-GYqxgQ undefined\"><\/div>\n<p><strong>Fact<\/strong>: API 600 only specifies that API 598 testing is mandatory; it does not detail specific test procedures or acceptance criteria.<\/li>\n<li><strong>Myth 2<\/strong>: API 598 applies only to gate valves.\n<div class=\"container-Uxvbjy md-box-line-break wrapper-GYqxgQ undefined\"><\/div>\n<p><strong>Fact<\/strong>: API 598 is a universal standard for all industrial valve types, not limited to gate valves.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>API 600 and API 598 are two core standards published by the\u00a0American Petroleum Institute (API)\u00a0that apply to industrial valves, but they focus on distinct aspects of valve design, manufacturing, and quality control. Clarifying their scopes and differences is critical for ensuring valve compliance and reliable performance in oil and gas, petrochemical, and other high-pressure industrial [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[15,14],"tags":[414,413],"class_list":["post-1403","post","type-post","status-publish","format-standard","hentry","category-industry-valve-news","category-news","tag-1500lb-api600-gate-valve-supplier","tag-understanding-api-600-and-api-598-and-their-differences"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Understanding API 600 and API 598 and Their Differences - China Industry Valves Supplier &amp; 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