{"id":4422,"date":"2026-08-03T16:41:46","date_gmt":"2026-08-03T08:41:46","guid":{"rendered":"https:\/\/www.pansvalve.com\/?p=4422"},"modified":"2026-08-27T21:25:11","modified_gmt":"2026-08-27T13:25:11","slug":"api-598-valve-testing-guide","status":"publish","type":"post","link":"https:\/\/www.pansvalve.com\/ru\/knowledge-center\/api-598-valve-testing-guide\/","title":{"rendered":"\u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0442 API 598 \u043f\u043e \u0438\u0441\u043f\u044b\u0442\u0430\u043d\u0438\u044e \u043a\u043b\u0430\u043f\u0430\u043d\u043e\u0432: \u041f\u043e\u043b\u043d\u043e\u0435 \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u043f\u043e \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0435 \u0438 \u0438\u0441\u043f\u044b\u0442\u0430\u043d\u0438\u044e."},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u041e\u0433\u043b\u0430\u0432\u043b\u0435\u043d\u0438\u0435<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"\u041f\u0435\u0440\u0435\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u041f\u0435\u0440\u0435\u043a\u043b\u044e\u0447\u0430\u0442\u044c<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.pansvalve.com\/ru\/knowledge-center\/api-598-valve-testing-guide\/#Quick_Answer_API_598_Testing\" >Quick Answer: API 598 Testing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.pansvalve.com\/ru\/knowledge-center\/api-598-valve-testing-guide\/#What_is_the_API_598_Standard\" >What is the API 598 Standard?&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.pansvalve.com\/ru\/knowledge-center\/api-598-valve-testing-guide\/#Mandatory_API_598_Valve_Inspection_and_Testing_Types\" >Mandatory API 598 Valve Inspection and Testing Types<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.pansvalve.com\/ru\/knowledge-center\/api-598-valve-testing-guide\/#The_API_598_Testing_Procedure_Step-by-Step\" >The API 598 Testing Procedure Step-by-Step<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.pansvalve.com\/ru\/knowledge-center\/api-598-valve-testing-guide\/#Which_Standard_Applies_API_598_vs_API_6D\" >Which Standard Applies? API 598 vs API 6D<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.pansvalve.com\/ru\/knowledge-center\/api-598-valve-testing-guide\/#API_598_Acceptance_Criteria_for_Allowable_Leakage\" >API 598 Acceptance Criteria for Allowable Leakage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.pansvalve.com\/ru\/knowledge-center\/api-598-valve-testing-guide\/#Common_API_598_Valve_Inspection_and_Testing_Pitfalls\" >Common API 598 Valve Inspection and Testing Pitfalls<\/a><\/li><\/ul><\/nav><\/div>\n\n<div style=\"border:1px solid #ccc; border-radius:4px; box-sizing:border-box; padding:0 !important;\">\n\n  <div style=\"padding:15px !important; box-sizing:border-box;\">\n\n    <h2 style=\"margin:0 0 10px 0 !important; padding:0 !important; width:100% !important; box-sizing:border-box;\"><span class=\"ez-toc-section\" id=\"Quick_Answer_API_598_Testing\"><\/span>\n      Quick Answer: API 598 Testing\n    <span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n    <p style=\"margin:0 !important; padding:0 !important; width:100% !important; box-sizing:border-box;\">\n      API 598 establishes the essential global standards for pressure-testing, seat tightness, and body integrity in industrial valves. It provides critical procedures for evaluating valve performance, including shell, closure, and backseat tests, before units enter service. <a href=\"https:\/\/www.pansvalve.com\/ru\">\u041f\u0410\u041d\u0421 \u043a\u043b\u0430\u043f\u0430\u043d<\/a> integrates these rigorous API 598 protocols into all manufacturing, ensuring every industrial valve delivers superior reliability and safety. With a 25,000m\u00b2 production base and over 40 years of engineering expertise, PANS Valve guarantees high-performance, fully compliant solutions for your most demanding projects.\n    <\/p>\n\n  <\/div>\n\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_API_598_Standard\"><\/span><strong>What is the API 598 Standard?&nbsp;<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The American Petroleum Institute set <strong>API 598<\/strong> as the global benchmark for valve inspection and testing. It covers pressure-test requirements for a wide range of industrial valves, including <a href=\"https:\/\/www.pansvalve.com\/ru\/product\/\" target=\"_blank\" rel=\"noreferrer noopener\">butterfly, check, ball, globe, plug, and gate valves<\/a> with varying seating materials.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Rather than a design standard, it establishes criteria and procedures for evaluating body integrity, seat tightness, leakage rates, and hold times before units are shipped out. It is commonly used alongside API 600, API 602, and API 6D.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Mandatory_API_598_Valve_Inspection_and_Testing_Types\"><\/span><strong>Mandatory API 598 Valve Inspection and Testing Types<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>API 598<\/strong> checks two important aspects of valve performance: leak-tight closure and pressure-boundary integrity. Depending on the design, manufacturers may have to perform the following tests before a product can enter service.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>API 598 Shell Test for Body Strength<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Also known as the body test, it validates the integrity of pressure-containing components. During this hydrostatic procedure, a partially open valve is mounted on a bench, then pressure is applied to the walls, bonnet, and joints to identify leakage. The acceptable <strong>API 598 test pressure<\/strong> for steel valves must be at least 1.5 times the rated cold working pressure (CWP).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>API 598 Closure Test for Seat Tightness<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Also called the <strong>API 598 seat test<\/strong>, it confirms the sealing ability of the internal mechanism when fully closed. A high-pressure test is mandatory for various valve types under heavy load conditions. This is performed at 1.1 times the allowed CWP. A low-pressure test is needed for DN 100 or NPS 4 valves and smaller. This uses gas and air at 80 \u00b1 20 psig to detect micro leaks the high-pressure test might miss.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>API 598 Backseat Test for Stem Seals<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When a valve has a backseat feature, this verifies the seal between the shaft or stem and the bonnet when the valve is fully open. Like with the closure test, the required pressure is 1.1 times the maximum allowable CWP. Please note that this test does not apply to designs that have <a href=\"https:\/\/www.pansvalve.com\/ru\/product\/din-bellow-sealed-globe-valve\/\" target=\"_blank\" rel=\"noreferrer noopener\">bellow seals<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Standard Test Media: Liquid or Gas<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">According to <strong>valve testing standards<\/strong>, high-pressure tests generally use liquids like kerosene and clean water with corrosion inhibitors. Meanwhile, low-pressure tests utilize air, nitrogen, and inert gas to check for tiny leaks. Leakage is detected with a volumetric device or when bubbles are observed when the valve is immersed in water.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_API_598_Testing_Procedure_Step-by-Step\"><\/span><strong>The API 598 Testing Procedure Step-by-Step<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"450\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/08\/436436.webp\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"This image provides a glimpse of the step-by-step API 598 testing procedure, although it may differ in actuality.\" class=\"wp-image-4425 lazyload\"\/><noscript><img decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/08\/436436.webp\" alt=\"This image provides a glimpse of the step-by-step API 598 testing procedure, although it may differ in actuality.\" class=\"wp-image-4425\" srcset=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/08\/436436.webp 800w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/08\/436436-300x169.webp 300w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/08\/436436-768x432.webp 768w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/08\/436436-18x10.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">To ensure reliable results, it is vital to follow the defined sequence when conducting <strong>API 598 valve inspection and testing<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 1: Preparing the Valve for Testing<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Before testing begins, make sure the valve is clean and free of any sealant, paint, grease, oil, and other materials. The only exception is <a href=\"https:\/\/www.pansvalve.com\/ru\/blog\/plug-valve\/lubricated-vs-non-lubricated-plug-valves\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u0441\u043c\u0430\u0437\u0430\u043d\u043d\u044b\u0435 \u043f\u0440\u043e\u0431\u043a\u043e\u0432\u044b\u0435 \u043a\u043b\u0430\u043f\u0430\u043d\u044b<\/a> that rely on injectable sealants to operate properly. When using liquids, remove any trapped air from the cavity for accurate readings.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 2: Performing the API 598 Shell Test<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This serves as the first round of pressure validation. Hydrostatic pressure is raised to 1.5 times the rated CWP and then applied to the body. For NPS 2 and smaller valves, the test is held for at least 15 seconds. This becomes 60 seconds for NPS 2.5 to 6 and up to 600 seconds for units larger than NPS 24.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 3: Executing the API 598 Closure Test<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For those with a backseat feature, the valves are fully opened, and the packing gland is loosened. Otherwise, the valve is fully closed, and 1.1 times the CWP pressure is applied to the inlet. The hold times are relatively the same as the shell test but go up to 240 seconds for bigger units.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 4: Checking the API 598 Acceptance Criteria<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">After testing, all castings are visually inspected for any leakage or surface defects according to MSS SP-55 benchmarks. Resilient-seated valves must have zero leakage during the tests, while metal-seated valves have allowable limits based on size and test media. Additional details on these specific criteria are provided in a separate section of this article.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Which_Standard_Applies_API_598_vs_API_6D\"><\/span><strong>Which Standard Applies? API 598 vs API 6D<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"450\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/08\/63463.webp\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"This image shows manufacturers and buyers weighing in on API 598 versus API 6D standards.\" class=\"wp-image-4426 lazyload\"\/><noscript><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/08\/63463.webp\" alt=\"This image shows manufacturers and buyers weighing in on API 598 versus API 6D standards.\" class=\"wp-image-4426\" srcset=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/08\/63463.webp 800w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/08\/63463-768x432.webp 768w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/08\/63463-300x169.webp 300w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/08\/63463-18x10.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/noscript><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Both standards by the American Petroleum Institute are valuable, but they are not interchangeable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Key Differences Between API 598 and API 6D<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>API 598<\/strong> is universal for all pressure-containing industrial valves regardless of where they are used. In contrast, API 6D is specifically for pipeline valves in large-scale petroleum and natural gas transmission systems.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><em>Additional testing<\/em><\/strong>: API 6D also covers pipeline safety tests, such as Double Block and Bleed (DBB) and Double Isolation and Bleed (DIB).<\/li>\n\n\n\n<li><strong><em>Test durations<\/em><\/strong>: API 6D requires longer hold times. For instance, a 2-minute hold is necessary under API 6D when it\u2019s only 15 seconds under the general protocol.<\/li>\n\n\n\n<li><strong><em>Torque and operability<\/em><\/strong>: API 6D emphasizes operational performance, so it includes torque measurement and traceability documents such as material test reports.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">More on the differences between API 598 and API 6D are found in \u201c<a href=\"https:\/\/www.pansvalve.com\/ru\/blog\/api-598-vs-api-6d-valves\/\" target=\"_blank\" rel=\"noreferrer noopener\">API 598 \u043f\u0440\u043e\u0442\u0438\u0432 API 6D: \u043a\u0430\u043a\u043e\u0439 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442 \u043a\u043b\u0430\u043f\u0430\u043d\u043e\u0432 \u043f\u043e\u0434\u0445\u043e\u0434\u0438\u0442 \u0434\u043b\u044f \u0432\u0430\u0448\u0435\u0439 \u043e\u0442\u0440\u0430\u0441\u043b\u0438?<\/a>\u201d, specifically on stringency and industry applications.<\/p>\n\n\n\n<style>\n    \/* \u5bfc\u5165 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\u043c\u0435\u0442\u0430\u043b\u043b\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u043f\u043e\u0432\u043e\u0440\u043e\u0442\u043d\u044b\u0439 \u0437\u0430\u0442\u0432\u043e\u0440 \u0441 \u0436\u0435\u0441\u0442\u043a\u0438\u043c \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0435\u043c<\/p>\n        <p class=\"cldg-card-description\">\n            1. \u041a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u044f \u0441 \u0442\u0440\u0435\u043c\u044f \u044d\u043a\u0441\u0446\u0435\u043d\u0442\u0440\u0438\u043a\u0430\u043c\u0438: \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0435 \u0431\u0435\u0437 \u0442\u0440\u0435\u043d\u0438\u044f, \u043f\u0440\u043e\u0434\u043b\u0435\u0432\u0430\u044e\u0449\u0435\u0435 \u0441\u0440\u043e\u043a \u0441\u043b\u0443\u0436\u0431\u044b.<br>\n            2. \u0420\u0430\u0434\u0438\u0430\u043b\u044c\u043d\u0430\u044f \u0434\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0441\u0431\u0430\u043b\u0430\u043d\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u044f: \u0441\u043d\u0438\u0436\u0430\u0435\u0442 \u0440\u0430\u0431\u043e\u0447\u0438\u0439 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u0435\u0442 \u0434\u0432\u0443\u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0435\u0435 \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0435.<br>\n            3. \u0423\u043f\u043b\u043e\u0442\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u043a\u043e\u043b\u044c\u0446\u043e \u0438\u0437 \u043a\u043e\u043c\u043f\u043e\u0437\u0438\u0442\u043d\u043e\u0433\u043e \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u0430: \u044d\u043a\u043e\u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0438 \u0447\u0438\u0441\u0442\u044b\u0439, \u0438\u0437\u043d\u043e\u0441\u043e\u0441\u0442\u043e\u0439\u043a\u0438\u0439, \u0432\u044b\u0441\u043e\u043a\u0438\u0439 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442 \u0433\u0435\u0440\u043c\u0435\u0442\u0438\u0447\u043d\u043e\u0441\u0442\u0438.\n        <\/p>\n        <a href=\"https:\/\/www.pansvalve.com\/ru\/products\/three-eccentric-metal-hard-seal-butterfly-valve\/\" class=\"cldg-card-cta-button\">\u041f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u0431\u043e\u043b\u0435\u0435 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u0443\u044e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e<\/a>\n    <\/div>\n\n    <div class=\"cldg-card-image-column\">\n        <img decoding=\"async\" class=\"lazyload\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2024\/09\/1-Three-Eccentric-Metal-Hard-Seal-Butterfly-Valve_butt-weld-type.png\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"\u0422\u0440\u0435\u0445\u044d\u043a\u0441\u0446\u0435\u043d\u0442\u0440\u0438\u043a\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u0430\u043b\u043b\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u043f\u043e\u0432\u043e\u0440\u043e\u0442\u043d\u044b\u0439 \u0437\u0430\u0442\u0432\u043e\u0440 \u0441 \u0436\u0435\u0441\u0442\u043a\u0438\u043c \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0435\u043c\"><noscript><img decoding=\"async\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2024\/09\/1-Three-Eccentric-Metal-Hard-Seal-Butterfly-Valve_butt-weld-type.png\" alt=\"\u0422\u0440\u0435\u0445\u044d\u043a\u0441\u0446\u0435\u043d\u0442\u0440\u0438\u043a\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u0430\u043b\u043b\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u043f\u043e\u0432\u043e\u0440\u043e\u0442\u043d\u044b\u0439 \u0437\u0430\u0442\u0432\u043e\u0440 \u0441 \u0436\u0435\u0441\u0442\u043a\u0438\u043c \u0443\u043f\u043b\u043e\u0442\u043d\u0435\u043d\u0438\u0435\u043c\"><\/noscript>\n    <\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"API_598_Acceptance_Criteria_for_Allowable_Leakage\"><\/span><strong>API 598 Acceptance Criteria for Allowable Leakage<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">While no visible leakage is permitted for resilient-seated valves, these are the minimal leakage rates measured in drops per minute for liquid tests and bubbles per minute for gas tests.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong><em>Size (NPS) in inches<\/em><\/strong><\/td><td><strong><em>Drops per minute<\/em><\/strong><\/td><td><strong><em>Bubbles per minute<\/em><\/strong><\/td><\/tr><tr><td>\u2264 2<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>2 \u00bd&nbsp;<\/td><td>5<\/td><td>10<\/td><\/tr><tr><td>3<\/td><td>6<\/td><td>12<\/td><\/tr><tr><td>4<\/td><td>8<\/td><td>16<\/td><\/tr><tr><td>6<\/td><td>12<\/td><td>24<\/td><\/tr><tr><td>8<\/td><td>16<\/td><td>32<\/td><\/tr><tr><td>10<\/td><td>20<\/td><td>40<\/td><\/tr><tr><td>12<\/td><td>24<\/td><td>48<\/td><\/tr><tr><td>\u2265 14<\/td><td>2 x NPS<\/td><td>4 x NPS<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_API_598_Valve_Inspection_and_Testing_Pitfalls\"><\/span><strong>Common API 598 Valve Inspection and Testing Pitfalls<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Despite following the defined sequence, some typical mistakes can compromise the accuracy of the results. For instance, excessive force or supplemental leverage might be applied to close a valve during seat testing. This damages the valve or creates a temporary seal, thereby failing to reflect actual operational performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Another major error is neglecting to test media purity, be it liquid or gas. For instance, when testing austenitic stainless steel valves, the chloride content in the water might not have been checked. Also, protective paint or coatings may have been applied before completing the shell test, which masks porosity issues or joint leaks.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>PANS Valve for API-Compliant Industrial Valves<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Zhejiang Zhedong Valve Corp., Ltd eliminates risks and ensures project success by adhering to global standards like <strong>API 598<\/strong> in manufacturing high-performance globe, gate, and other valves. Established in 1985, PANS Valve boasts a 25,000m\u00b2 production base in Wenzhou, China, and over 3 decades of engineering experience and expertise in valve solutions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Get in touch with PANS Valve today to ensure all valve components and products used in your industrial system are API-tested and compliant.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-fe48e5de wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-white-color has-red-background-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/www.pansvalve.com\/ru\/contact-us\/\">\u041f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u0435<\/a><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Quick Answer: API 598 Testing API 598 establishes the essential global standards for pressure-testing, seat tightness, and body integrity in industrial valves. It provides critical procedures for evaluating valve performance, including shell, closure, and backseat tests, before units enter service. PANS Valve integrates these rigorous API 598 protocols into all manufacturing, ensuring every industrial valve [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4424,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4422","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge-center"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>API 598 Valve Testing Standard Inspection &amp; Testing Guide<\/title>\n<meta name=\"description\" content=\"Learn how the API 598 valve inspection and testing standard works when ordering industrial valves from PANS Valve.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pansvalve.com\/ru\/knowledge-center\/api-598-valve-testing-guide\/\" \/>\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"API 598 Valve Testing Standard Inspection &amp; 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