{"id":100275,"date":"2026-02-15T20:31:27","date_gmt":"2026-02-15T20:31:27","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100275"},"modified":"2026-07-02T18:21:06","modified_gmt":"2026-07-02T18:21:06","slug":"valve-leak-rate-iso5208","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/te\/calculators\/valve-leak-rate-iso5208\/","title":{"rendered":"\u0c35\u0c3e\u0c32\u0c4d\u0c35\u0c4d \u0c32\u0c40\u0c15\u0c4d \u0c30\u0c47\u0c1f\u0c41 \u0c15\u0c3e\u0c32\u0c4d\u0c15\u0c4d\u0c2f\u0c41\u0c32\u0c47\u0c1f\u0c30\u0c4d | ISO 5208 \u0c24\u0c30\u0c17\u0c24\u0c41\u0c32\u0c41 A\u2013F"},"content":{"rendered":"\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Valve Leak Rate Calculator\",\"alternateName\":[\"ISO 5208 Calculator\",\"Valve Seat Leakage Calculator\",\"Valve Test Calculator\"],\"description\":\"Free online calculator for maximum allowable valve closure test leakage per ISO 5208:2015 Table 4. 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print{.vc-section-body{max-height:none!important}.vc-faq-a{max-height:none!important}.vc-results{max-height:none!important;padding:24px!important}.vc-copy-btn,.vc-section-chevron,.vc-faq-chevron,.vc-presets,.vc-promo{display:none!important}}\n<\/style>\n\n<div class=\"vc-calculator\" id=\"vc-valve-leak\">\n\n<header class=\"vc-header\">\n    <p class=\"vc-header-eyebrow\">Free Engineering Tool<\/p>\n    <h1 class=\"vc-header-title\">Valve Leak Rate Calculator<\/h1>\n    <p class=\"vc-header-subtitle\">Determine the maximum allowable closure test leakage per ISO 5208:2015 (Table 4) for leakage rates A through G. Evaluate pass\/fail based on measured leak rate for liquid and gas testing.<\/p>\n    <div class=\"vc-badges\">\n        <span class=\"vc-badge\">ISO 5208:2015<\/span>\n        <span class=\"vc-badge\">Rates A \u2013 G<\/span>\n        <span class=\"vc-badge\">Liquid &amp; Gas<\/span>\n    <\/div>\n<\/header>\n\n<div class=\"vc-card\">\n    <form class=\"vc-form\" id=\"vc-form\" autocomplete=\"off\">\n        <div class=\"vc-form-grid\">\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-dn\">Valve Size (DN) <span class=\"vc-label-hint\">(mm)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-dn\" inputmode=\"decimal\" step=\"any\" min=\"1\" placeholder=\"e.g. 100\" value=\"100\">\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-class\">Leakage Rate (ISO 5208:2015, Table 4)<\/label>\n                <select class=\"vc-select\" id=\"vc-class\">\n                    <option value=\"A\">Rate A \u2014 No visually detectable leakage<\/option>\n                    <option value=\"AA\">Rate AA \u2014 0.006 \u00d7 DN (liq) \/ 0.18 \u00d7 DN (gas) mm\u00b3\/s<\/option>\n                    <option value=\"B\">Rate B \u2014 0.01 \u00d7 DN (liq) \/ 0.3 \u00d7 DN (gas) mm\u00b3\/s<\/option>\n                    <option value=\"C\">Rate C \u2014 0.03 \u00d7 DN (liq) \/ 3 \u00d7 DN (gas) mm\u00b3\/s<\/option>\n                    <option value=\"CC\">Rate CC \u2014 0.08 \u00d7 DN (liq) \/ 22.3 \u00d7 DN (gas) mm\u00b3\/s<\/option>\n                    <option value=\"D\" selected>Rate D \u2014 0.1 \u00d7 DN (liq) \/ 30 \u00d7 DN (gas) mm\u00b3\/s<\/option>\n                    <option value=\"E\">Rate E \u2014 0.3 \u00d7 DN (liq) \/ 300 \u00d7 DN (gas) mm\u00b3\/s<\/option>\n                    <option value=\"EE\">Rate EE \u2014 0.39 \u00d7 DN (liq) \/ 470 \u00d7 DN (gas) mm\u00b3\/s<\/option>\n                    <option value=\"F\">Rate F \u2014 1 \u00d7 DN (liq) \/ 3000 \u00d7 DN (gas) mm\u00b3\/s<\/option>\n                    <option value=\"G\">Rate G \u2014 2 \u00d7 DN (liq) \/ 6000 \u00d7 DN (gas) mm\u00b3\/s<\/option>\n                <\/select>\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-fluid\">Test Fluid<\/label>\n                <select class=\"vc-select\" id=\"vc-fluid\">\n                    <option value=\"liquid\" selected>Liquid (water)<\/option>\n                    <option value=\"gas\">Gas (air\/nitrogen)<\/option>\n                <\/select>\n            <\/div>\n            <div class=\"vc-field\">\n                <label class=\"vc-label\" for=\"vc-measured\">Measured Leak Rate <span class=\"vc-label-hint\">(mm\u00b3\/s)<\/span><\/label>\n                <input class=\"vc-input\" type=\"number\" id=\"vc-measured\" inputmode=\"decimal\" step=\"any\" min=\"0\" placeholder=\"e.g. 2\" value=\"\">\n            <\/div>\n        <\/div>\n\n        <div class=\"vc-presets\">\n            <div class=\"vc-presets-label\">Quick presets<\/div>\n            <button type=\"button\" class=\"vc-preset-btn\" data-dn=\"50\" data-c=\"D\" data-f=\"liquid\">DN50 \/ Rate D \/ liquid<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-dn=\"150\" data-c=\"D\" data-f=\"liquid\">DN150 \/ Rate D \/ liquid<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-dn=\"200\" data-c=\"A\" data-f=\"gas\">DN200 \/ Rate A \/ gas<\/button>\n            <button type=\"button\" class=\"vc-preset-btn\" data-dn=\"100\" data-c=\"C\" data-f=\"liquid\">DN100 \/ Rate C \/ liquid<\/button>\n        <\/div>\n    <\/form>\n\n    <div class=\"vc-results\" id=\"vc-results\">\n        <div class=\"vc-results-head\">\n            <h2 class=\"vc-results-title\">Results<\/h2>\n            <button type=\"button\" class=\"vc-copy-btn\" id=\"vc-copy-btn\">\n                <svg width=\"14\" height=\"14\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg>\n                Copy\n            <\/button>\n        <\/div>\n        <div class=\"vc-result-grid\">\n            <div class=\"vc-rcard vc-rcard-primary\">\n                <div class=\"vc-rcard-label\">Maximum Permissible Leak Rate<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-max\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Leakage Rate Description<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-desc\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\">\n                <div class=\"vc-rcard-label\">Recommended Test Duration<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-duration\">\u2014<\/div>\n            <\/div>\n            <div class=\"vc-rcard\" id=\"vc-r-verdict-card\">\n                <div class=\"vc-rcard-label\">Pass \/ Fail Evaluation<\/div>\n                <div class=\"vc-rcard-value\" id=\"vc-r-verdict\">\u2014<\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<!-- Theory -->\n<div class=\"vc-section vc-open\" id=\"vc-sec-theory\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"true\">\n        <span class=\"vc-section-toggle-text\">\n            <span class=\"vc-section-icon\">\ud83d\udcd8<\/span>\n            <span class=\"vc-section-title\">Theory &amp; Leakage Classes<\/span>\n        <\/span>\n        <svg class=\"vc-section-chevron\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg>\n    <\/button>\n    <div class=\"vc-section-body\">\n        <div class=\"vc-section-inner vc-theory\">\n            <h3>ISO 5208:2015 Closure Test Leakage Rates<\/h3>\n            <p>ISO 5208:2015 (Table 4) defines ten closure test leakage rates \u2014 A, AA, B, C, CC, D, E, EE, F and G \u2014 for industrial valve testing. The maximum allowable leakage is directly proportional to the valve size DN and does <strong>not<\/strong> depend on the test pressure. The closure test pressure itself is fixed by the standard (see note below).<\/p>\n\n            <table class=\"vc-table\">\n                <thead><tr><th>Rate<\/th><th>Liquid (mm\u00b3\/s)<\/th><th>Liquid (drops\/s)<\/th><th>Gas (mm\u00b3\/s)<\/th><th>Gas (bubbles\/s)<\/th><\/tr><\/thead>\n                <tbody>\n                    <tr><td><strong>A<\/strong><\/td><td colspan=\"4\">No visually detectable leakage for the duration of the test<\/td><\/tr>\n                    <tr><td><strong>AA<\/strong><\/td><td>0.006 \u00d7 DN<\/td><td>0.0001 \u00d7 DN<\/td><td>0.18 \u00d7 DN<\/td><td>0.003 \u00d7 DN<\/td><\/tr>\n                    <tr><td><strong>B<\/strong><\/td><td>0.01 \u00d7 DN<\/td><td>0.00016 \u00d7 DN<\/td><td>0.3 \u00d7 DN<\/td><td>0.0046 \u00d7 DN<\/td><\/tr>\n                    <tr><td><strong>C<\/strong><\/td><td>0.03 \u00d7 DN<\/td><td>0.0005 \u00d7 DN<\/td><td>3 \u00d7 DN<\/td><td>0.0458 \u00d7 DN<\/td><\/tr>\n                    <tr><td><strong>CC<\/strong><\/td><td>0.08 \u00d7 DN<\/td><td>0.0013 \u00d7 DN<\/td><td>22.3 \u00d7 DN<\/td><td>0.3407 \u00d7 DN<\/td><\/tr>\n                    <tr><td><strong>D<\/strong><\/td><td>0.1 \u00d7 DN<\/td><td>0.0016 \u00d7 DN<\/td><td>30 \u00d7 DN<\/td><td>0.4584 \u00d7 DN<\/td><\/tr>\n                    <tr><td><strong>E<\/strong><\/td><td>0.3 \u00d7 DN<\/td><td>0.0048 \u00d7 DN<\/td><td>300 \u00d7 DN<\/td><td>4.5837 \u00d7 DN<\/td><\/tr>\n                    <tr><td><strong>EE<\/strong><\/td><td>0.39 \u00d7 DN<\/td><td>0.0062 \u00d7 DN<\/td><td>470 \u00d7 DN<\/td><td>7.1293 \u00d7 DN<\/td><\/tr>\n                    <tr><td><strong>F<\/strong><\/td><td>1 \u00d7 DN<\/td><td>0.016 \u00d7 DN<\/td><td>3000 \u00d7 DN<\/td><td>45.837 \u00d7 DN<\/td><\/tr>\n                    <tr><td><strong>G<\/strong><\/td><td>2 \u00d7 DN<\/td><td>0.032 \u00d7 DN<\/td><td>6000 \u00d7 DN<\/td><td>91.673 \u00d7 DN<\/td><\/tr>\n                <\/tbody>\n            <\/table>\n\n            <h3>Formulas<\/h3>\n            <p>For <strong>liquid<\/strong> testing (water), the maximum allowable leakage in mm\u00b3\/s:<\/p>\n            <div class=\"vc-formula-box\" id=\"vc-katex-1\"><\/div>\n            <p>For <strong>gas<\/strong> testing (air\/N\u2082), the maximum allowable leakage in mm\u00b3\/s (or bubbles\/s):<\/p>\n            <div class=\"vc-formula-box\" id=\"vc-katex-2\"><\/div>\n            <p>where q<sub>L<\/sub> and q<sub>G<\/sub> are the unit leakage rates from Table 4 above (e.g. 0.1 mm\u00b3\/s per DN for Rate D, liquid) and DN is the nominal valve size. 1 mm\u00b3\/s = 0.06 ml\/min.<\/p>\n\n            <h3>Practical Example<\/h3>\n            <div class=\"vc-example-box\">\n                <div class=\"vc-example-title\">Example \u2014 DN100 Gate Valve, Rate D, Liquid Test<\/div>\n                <p><strong>Given:<\/strong> DN = 100 mm, leakage Rate D, liquid test<\/p>\n                <p>Q<sub>max<\/sub> = 0.1 \u00d7 100 = <strong>10 mm\u00b3\/s<\/strong> (= 0.6 ml\/min, \u2248 0.16 drops\/s)<\/p>\n                <p>If measured leak = 2 mm\u00b3\/s \u2192 <strong>PASS<\/strong> (within limit)<\/p>\n            <\/div>\n\n            <div class=\"vc-info-box\">\n                <p><strong>\u2139\ufe0f Test Duration (ISO 5208:2015, Table 2, closure test):<\/strong> DN \u2264 50: 15 s, DN 65\u2013150: 60 s, DN \u2265 200: 120 s (isolation valves). For check valves the minimum closure test duration is 60 s up to DN 150 and 120 s for DN \u2265 200.<\/p>\n            <\/div>\n\n            <div class=\"vc-info-box\">\n                <p><strong>\u2139\ufe0f Test Pressure:<\/strong> The closure test pressure is set by ISO 5208, not chosen freely: at least 1.1 \u00d7 CWP for liquid testing, and 1.1 \u00d7 CWP or 6 bar \u00b1 1 bar for gas testing. The Table 4 allowable leakage does not vary with the applied pressure.<\/p>\n            <\/div>\n\n            <div class=\"vc-warning-box\">\n                <p style=\"margin:0;font-size:14px;color:var(--vc-ink-secondary);\"><strong>\u26a0\ufe0f Note:<\/strong> Rate A does not mean mathematically zero \u2014 it means no visually detectable leakage during the specified test duration. Rates A, B, C, D, E, F and G correspond to the leakage values of EN 12266-1; API 598 acceptance values correspond to Rate A (DN \u2264 50), Rate AA (gas) and Rate CC (liquid) for other than metal-seated check valves, and to Rate EE (gas) \/ Rate G (liquid) for check valves (ISO 5208:2015, Table 4, Note 4).<\/p>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<!-- Related -->\n<div class=\"vc-section\" id=\"vc-sec-related\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\">\n        <span class=\"vc-section-toggle-text\">\n            <span class=\"vc-section-icon\">\ud83d\udd17<\/span>\n            <span class=\"vc-section-title\">Related Calculators<\/span>\n        <\/span>\n        <svg class=\"vc-section-chevron\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg>\n    <\/button>\n    <div class=\"vc-section-body\">\n        <div class=\"vc-section-inner\">\n            <div class=\"vc-related\">\n                <a class=\"vc-related-link\" href=\"\/calculators\/flange-rating-lookup\/\">Flange Rating Lookup<\/a>\n                <a class=\"vc-related-link\" href=\"\/calculators\/pressure-vessel-en13445\/\">Pressure Vessel (EN 13445)<\/a>\n                <a class=\"vc-related-link\" href=\"\/calculators\/pipe-flexibility-calculator\/\">Pipe Flexibility Calculator<\/a>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<!-- FAQ -->\n<div class=\"vc-section\" id=\"vc-sec-faq\">\n    <button type=\"button\" class=\"vc-section-toggle\" aria-expanded=\"false\">\n        <span class=\"vc-section-toggle-text\">\n            <span class=\"vc-section-icon\">\u2753<\/span>\n            <span class=\"vc-section-title\">Frequently Asked Questions<\/span>\n        <\/span>\n        <svg class=\"vc-section-chevron\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg>\n    <\/button>\n    <div class=\"vc-section-body\">\n        <div class=\"vc-section-inner\">\n            <div class=\"vc-faq-list\" id=\"vc-faq-list\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n\n<div class=\"vc-promo\">\n    <div class=\"vc-promo-text\">\n        <strong>Vibromera \u2014 Portable Balancing &amp; Vibration Analysis<\/strong><br>\n        Professional instruments for vibration diagnostics and field balancing. Used in 50+ countries.\n    <\/div>\n    <a class=\"vc-promo-link\" href=\"https:\/\/vibromera.eu\/\" target=\"_blank\" rel=\"noopener\">Learn More<\/a>\n<\/div>\n\n<footer class=\"vc-footer\">\n    <p>\u00a9 2024\u20132025 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a> \u2014 Engineering Calculators<\/p>\n    <p style=\"font-size:12px;margin-top:4px;\">Based on ISO 5208:2015 (Industrial valves \u2014 Pressure testing of metallic valves), Tables 2 and 4. Last updated: July 2026<\/p>\n    <div class=\"vc-footer-links\">\n        <a href=\"\/calculators\/engineering-calculators\/\">All Calculators<\/a>\n        <a href=\"https:\/\/vibromera.eu\/contacts\/\">Contact<\/a>\n    <\/div>\n<\/footer>\n\n<\/div>\n\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/katex@0.16.11\/dist\/katex.min.js\"><\/script>\n<script>\n(function(){\n    'use strict';\n    function $(id){ return document.getElementById(id); }\n    function fmt(n,d){ if(isNaN(n)||!isFinite(n)) return '\u2014'; var f=n.toFixed(d===undefined?2:d); return f.replace(\/(\\.\\d*?)0+$\/,'$1').replace(\/\\.$\/,''); }\n\n    \/\/ ISO 5208:2015 Table 4 unit leakage rates (per DN):\n    \/\/ liq\/gas in mm3\/s, drops in drops\/s, bub in bubbles\/s\n    var rates = {\n        A:  { liq: 0,     drops: 0,       gas: 0,    bub: 0,      desc: 'No visually detectable leakage' },\n        AA: { liq: 0.006, drops: 0.0001,  gas: 0.18, bub: 0.003,  desc: 'Rate AA \u2014 very tight closure' },\n        B:  { liq: 0.01,  drops: 0.00016, gas: 0.3,  bub: 0.0046, desc: 'Rate B \u2014 tight closure' },\n        C:  { liq: 0.03,  drops: 0.0005,  gas: 3,    bub: 0.0458, desc: 'Rate C \u2014 stringent process valves' },\n        CC: { liq: 0.08,  drops: 0.0013,  gas: 22.3, bub: 0.3407, desc: 'Rate CC \u2014 resilient\/soft-seated ref.' },\n        D:  { liq: 0.1,   drops: 0.0016,  gas: 30,   bub: 0.4584, desc: 'Rate D \u2014 common industrial rate' },\n        E:  { liq: 0.3,   drops: 0.0048,  gas: 300,  bub: 4.5837, desc: 'Rate E \u2014 less critical services' },\n        EE: { liq: 0.39,  drops: 0.0062,  gas: 470,  bub: 7.1293, desc: 'Rate EE \u2014 check-valve ref. (gas)' },\n        F:  { liq: 1,     drops: 0.016,   gas: 3000, bub: 45.837, desc: 'Rate F \u2014 coarse closure' },\n        G:  { liq: 2,     drops: 0.032,   gas: 6000, bub: 91.673, desc: 'Rate G \u2014 coarsest tabulated rate' }\n    };\n\n    \/\/ Minimum closure test duration by DN, seconds (ISO 5208:2015 Table 2, isolation valves)\n    function getTestDuration(dn) {\n        if (dn <= 50) return 15;\n        if (dn <= 150) return 60;\n        return 120;\n    }\n\n    function calculate() {\n        var dn = parseFloat($('vc-dn').value);\n        var cls = $('vc-class').value;\n        var fluid = $('vc-fluid').value;\n        var measured = parseFloat($('vc-measured').value);\n\n        if (!dn || dn <= 0) {\n            $('vc-results').classList.remove('vc-visible');\n            return;\n        }\n\n        var rate = rates[cls];\n        var k = fluid === 'liquid' ? rate.liq : rate.gas;\n        var kAlt = fluid === 'liquid' ? rate.drops : rate.bub;\n        var altUnit = fluid === 'liquid' ? 'drops\/s' : 'bubbles\/s';\n        var qMax = k * dn;\n        var qAlt = kAlt * dn;\n\n        \/\/ Display\n        if (cls === 'A') {\n            $('vc-r-max').innerHTML = '<span style=\"color:var(--vc-green)\">ZERO<\/span> <span class=\"vc-rcard-unit\">(no visually detectable leakage)<\/span>';\n        } else {\n            $('vc-r-max').innerHTML = fmt(qMax, qMax < 1 ? 4 : 2) + ' <span class=\"vc-rcard-unit\">mm\u00b3\/s<\/span> <span class=\"vc-rcard-unit\">(= ' + fmt(qMax * 0.06, 3) + ' ml\/min, ' + fmt(qAlt, qAlt < 1 ? 4 : 2) + ' ' + altUnit + ')<\/span>';\n        }\n\n        $('vc-r-desc').innerHTML = '<span style=\"font-size:16px\">' + rate.desc + '<\/span>';\n\n        var recDur = getTestDuration(dn);\n        $('vc-r-duration').innerHTML = recDur + ' <span class=\"vc-rcard-unit\">seconds<\/span> <span class=\"vc-rcard-unit\">(for DN ' + dn + ', isolation valves)<\/span>';\n\n        \/\/ Pass\/Fail\n        var card = $('vc-r-verdict-card');\n        card.className = 'vc-rcard';\n        if (!isNaN(measured) && measured >= 0) {\n            if (cls === 'A') {\n                if (measured === 0) {\n                    $('vc-r-verdict').innerHTML = '<span style=\"color:var(--vc-green);font-size:28px;\">\u2713 PASS<\/span>';\n                    card.className = 'vc-rcard vc-rcard-pass';\n                } else {\n                    $('vc-r-verdict').innerHTML = '<span style=\"color:var(--vc-red);font-size:28px;\">\u2717 FAIL<\/span> <span class=\"vc-rcard-unit\">(any detectable leak = fail)<\/span>';\n                    card.className = 'vc-rcard vc-rcard-fail';\n                }\n            } else {\n                if (measured <= qMax) {\n                    $('vc-r-verdict').innerHTML = '<span style=\"color:var(--vc-green);font-size:28px;\">\u2713 PASS<\/span> <span class=\"vc-rcard-unit\">(' + fmt(measured,2) + ' \u2264 ' + fmt(qMax,2) + ' mm\u00b3\/s)<\/span>';\n                    card.className = 'vc-rcard vc-rcard-pass';\n                } else {\n                    $('vc-r-verdict').innerHTML = '<span style=\"color:var(--vc-red);font-size:28px;\">\u2717 FAIL<\/span> <span class=\"vc-rcard-unit\">(' + fmt(measured,2) + ' > ' + fmt(qMax,2) + ' mm\u00b3\/s)<\/span>';\n                    card.className = 'vc-rcard vc-rcard-fail';\n                }\n            }\n        } else {\n            $('vc-r-verdict').innerHTML = '<span class=\"vc-rcard-unit\">Enter measured leak rate above<\/span>';\n        }\n\n        $('vc-results').classList.add('vc-visible');\n    }\n\n    \/* \u2500\u2500 PRESETS \u2500\u2500 *\/\n    document.querySelectorAll('.vc-preset-btn').forEach(function(btn){\n        btn.addEventListener('click', function(e){\n            e.preventDefault();\n            $('vc-dn').value = this.getAttribute('data-dn');\n            $('vc-class').value = this.getAttribute('data-c');\n            $('vc-fluid').value = this.getAttribute('data-f');\n            calculate();\n        });\n    });\n\n    $('vc-form').addEventListener('input', calculate);\n    $('vc-form').addEventListener('change', calculate);\n\n    \/* \u2500\u2500 COPY \u2500\u2500 *\/\n    $('vc-copy-btn').addEventListener('click', function(){\n        var text = 'Valve Leak Rate Calculation (ISO 5208:2015, Table 4)\\n\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\n' +\n            'DN: ' + $('vc-dn').value + ' mm\\n' +\n            'Leakage Rate: ' + $('vc-class').value + '\\n' +\n            'Fluid: ' + $('vc-fluid').options[$('vc-fluid').selectedIndex].text + '\\n' +\n            'Max Leak Rate: ' + $('vc-r-max').textContent + '\\n' +\n            'Verdict: ' + $('vc-r-verdict').textContent + '\\n' +\n            '\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\u2501\\nvibromera.eu\/calculators\/valve-leak-rate-iso5208\/';\n        if(navigator.clipboard){\n            navigator.clipboard.writeText(text).then(function(){\n                var btn=$('vc-copy-btn'); btn.classList.add('vc-copied');\n                btn.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><polyline points=\"20 6 9 17 4 12\"\/><\/svg> Copied!';\n                setTimeout(function(){ btn.classList.remove('vc-copied'); btn.innerHTML='<svg width=\"14\" height=\"14\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><rect x=\"9\" y=\"9\" width=\"13\" height=\"13\" rx=\"2\"\/><path d=\"M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1\"\/><\/svg> Copy'; },2000);\n            });\n        }\n    });\n\n    \/* \u2500\u2500 SECTIONS \u2500\u2500 *\/\n    document.querySelectorAll('.vc-section-toggle').forEach(function(btn){\n        btn.addEventListener('click', function(){\n            var s=this.closest('.vc-section'); s.classList.toggle('vc-open');\n            this.setAttribute('aria-expanded', s.classList.contains('vc-open'));\n        });\n    });\n\n    \/* \u2500\u2500 FAQ \u2500\u2500 *\/\n    var faqData = [\n        { q:'What is ISO 5208?', a:'<p>ISO 5208:2015 (Industrial valves \u2014 Pressure testing of metallic valves) defines the requirements for pressure testing of industrial valves, including shell and closure (seat) tests. Table 4 of the standard specifies ten closure test leakage rates \u2014 A, AA, B, C, CC, D, E, EE, F and G \u2014 with defined acceptance criteria.<\/p>' },\n        { q:'What is the difference between Rate A and Rate D?', a:'<p><strong>Rate A<\/strong> requires no visually detectable leakage for the duration of the test \u2014 the most stringent requirement, used for critical services (toxic, flammable fluids). <strong>Rate D<\/strong> allows a leakage of 0.1 \u00d7 DN mm\u00b3\/s for liquid or 30 \u00d7 DN mm\u00b3\/s for gas \u2014 a commonly specified industrial rate for general process applications.<\/p>' },\n        { q:'Does the allowable leak rate depend on test pressure?', a:'<p>No. In ISO 5208:2015 Table 4 the maximum allowable closure test leakage is directly proportional to the valve size DN only (e.g. Rate D liquid = 0.1 \u00d7 DN mm\u00b3\/s). The test pressure is prescribed separately by the standard: at least 1.1 \u00d7 CWP for liquid closure tests, and 1.1 \u00d7 CWP or 6 bar \u00b1 1 bar for gas closure tests.<\/p>' },\n        { q:'What is the difference between ISO 5208 and API 598 \/ EN 12266?', a:'<p>All three cover valve pressure testing. ISO 5208:2015 defines ten leakage rates (A\u2013G, including AA, CC, EE); its Rates A, B, C, D, E, F and G correspond to the leakage values of EN 12266-1. API 598 acceptance values correspond to ISO 5208 Rate A (DN \u2264 50), Rate AA (gas) and Rate CC (liquid) for most valves, and Rate EE (gas) \/ Rate G (liquid) for check valves. API 598 is widely used in North America, ISO 5208 internationally.<\/p>' },\n        { q:'Can gas and liquid leak rates be compared?', a:'<p>Not directly. Both are tabulated in mm\u00b3\/s, but for the same rate designation the gas value is much larger (e.g. Rate D: 0.1 \u00d7 DN mm\u00b3\/s liquid vs 30 \u00d7 DN mm\u00b3\/s gas) because gas has far lower viscosity. In practice liquid leakage is often counted in drops\/s and gas leakage in bubbles\/s \u2014 ISO 5208 Table 4 tabulates both sets of units.<\/p>' }\n    ];\n    var faqList = $('vc-faq-list');\n    faqData.forEach(function(faq){ faqList.innerHTML += '<div class=\"vc-faq-item\"><button type=\"button\" class=\"vc-faq-q\"><span>'+faq.q+'<\/span><svg class=\"vc-faq-chevron\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\"><path d=\"M6 9l6 6 6-6\"\/><\/svg><\/button><div class=\"vc-faq-a\"><div class=\"vc-faq-a-inner\">'+faq.a+'<\/div><\/div><\/div>'; });\n    faqList.addEventListener('click', function(e){ var btn=e.target.closest('.vc-faq-q'); if(btn) btn.closest('.vc-faq-item').classList.toggle('vc-open'); });\n\n    \/* \u2500\u2500 KATEX \u2500\u2500 *\/\n    function renderFormulas(){\n        try{\n            katex.render('Q_{\\\\text{liquid}} = q_L \\\\times DN \\\\quad [\\\\text{mm}^3\/\\\\text{s}]', $('vc-katex-1'), {displayMode:true,throwOnError:false});\n            katex.render('Q_{\\\\text{gas}} = q_G \\\\times DN \\\\quad [\\\\text{mm}^3\/\\\\text{s}]', $('vc-katex-2'), {displayMode:true,throwOnError:false});\n        }catch(e){}\n    }\n\n    function init(){\n        renderFormulas();\n        calculate();\n    }\n    if(document.readyState==='loading') document.addEventListener('DOMContentLoaded',init); else init();\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>ISO 5208 \u0c2a\u0c4d\u0c30\u0c15\u0c3e\u0c30\u0c02 \u0c35\u0c3e\u0c32\u0c4d\u0c35\u0c4d \u0c32\u0c40\u0c15\u0c4d \u0c30\u0c47\u0c1f\u0c41 \u0c15\u0c4a\u0c32\u0c1a\u0c21\u0c3e\u0c28\u0c3f\u0c15\u0c3f \u0c09\u0c1a\u0c3f\u0c24 \u0c06\u0c28\u0c4d\u200c\u0c32\u0c48\u0c28\u0c4d \u0c15\u0c3e\u0c32\u0c4d\u0c15\u0c4d\u0c2f\u0c41\u0c32\u0c47\u0c1f\u0c30\u0c4d. \u0c35\u0c3e\u0c32\u0c4d\u0c35\u0c4d \u0c38\u0c40\u0c1f\u0c4d \u0c32\u0c40\u0c15\u0c47\u0c1c\u0c40 \u0c24\u0c30\u0c17\u0c24\u0c41\u0c32\u0c41 A \u0c28\u0c41\u0c02\u0c21\u0c3f F \u0c35\u0c30\u0c15\u0c41 \u0c17\u0c30\u0c3f\u0c37\u0c4d\u0c1f \u0c05\u0c28\u0c41\u0c2e\u0c24\u0c3f\u0c02\u0c1a\u0c26\u0c17\u0c3f\u0c28 \u0c32\u0c40\u0c15\u0c47\u0c1c\u0c40\u0c28\u0c3f \u0c28\u0c3f\u0c30\u0c4d\u0c23\u0c2f\u0c3f\u0c02\u0c1a\u0c02\u0c21\u0c3f. \u0c26\u0c4d\u0c30\u0c35 \u0c2e\u0c30\u0c3f\u0c2f\u0c41 \u0c35\u0c3e\u0c2f\u0c41\u0c35\u0c41 \u0c2a\u0c30\u0c40\u0c15\u0c4d\u0c37\u0c15\u0c41 \u0c2a\u0c3e\u0c38\u0c4d\/\u0c2b\u0c46\u0c2f\u0c3f\u0c32\u0c4d \u0c05\u0c02\u0c1a\u0c28\u0c3e \u0c35\u0c47\u0c2f\u0c02\u0c21\u0c3f.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100275","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/te\/wp-json\/wp\/v2\/calculator\/100275","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/te\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/te\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":3,"href":"https:\/\/vibromera.eu\/te\/wp-json\/wp\/v2\/calculator\/100275\/revisions"}],"predecessor-version":[{"id":102024,"href":"https:\/\/vibromera.eu\/te\/wp-json\/wp\/v2\/calculator\/100275\/revisions\/102024"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/te\/wp-json\/wp\/v2\/media?parent=100275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/te\/wp-json\/wp\/v2\/categories?post=100275"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/te\/wp-json\/wp\/v2\/tags?post=100275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}