{"id":18528,"date":"2025-07-24T12:51:06","date_gmt":"2025-07-24T12:51:06","guid":{"rendered":"https:\/\/oudianvalve.com\/?p=18528"},"modified":"2025-07-24T12:51:06","modified_gmt":"2025-07-24T12:51:06","slug":"api-598-valve-seat-leakage-rates-explained-for-engineers","status":"publish","type":"post","link":"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/","title":{"rendered":"Spiegazione per gli ingegneri dei tassi di perdita delle sedi valvole secondo lo standard API 598."},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87_1 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\">Sommario<\/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=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Attiva\/disattiva<\/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' ><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/#API_598_Valve_Seat_Leakage_Rates_%E2%80%93_Engineers_Guide\" >Tassi di perdita delle sedi valvole API 598 \u2013 Guida per ingegneri<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/#1_API_598_Leakage_Test_Overview\" >1. Panoramica del test di tenuta API 598<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/#2_Allowable_Leakage_Rates_by_Valve_Type\" >2. Tassi di perdita ammissibili per tipo di valvola<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/#A_Metal-Seated_Valves\" >A. Valvole con sede metallica<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/#Key_Notes_for_Metal_Seats\" >Note importanti per i sedili in metallo:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/#B_Soft-Seated_Valves\" >B. Valvole con sede morbida<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/#3_Testing_Procedures\" >3. Procedure di prova<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/#Step-by-Step_Seat_Leakage_Test\" >Test di tenuta del sedile passo dopo passo<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/#4_Industry_Variations_Comparisons\" >4. Variazioni e confronti tra i settori<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/#5_Common_Failure_Causes_Fixes\" >5. Cause comuni di guasto e relative soluzioni<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/#6_Practical_Tips_for_Engineers\" >6. Consigli pratici per gli ingegneri<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/api-598-valve-seat-leakage-rates-explained-for-engineers\/#Conclusion\" >Conclusione<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"API_598_Valve_Seat_Leakage_Rates_%E2%80%93_Engineers_Guide\"><\/span><strong>Tassi di perdita delle sedi valvole API 598 \u2013 Guida per ingegneri<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\">API 598 \u00e8 il\u00a0<strong>standard di settore per il collaudo delle valvole<\/strong>, garantendo l&#039;integrit\u00e0 della tenuta sotto pressione. Per gli ingegneri, la comprensione\u00a0<strong>criteri di accettazione della perdita di sedile<\/strong>\u00a0\u00e8 fondamentale per la conformit\u00e0 e il funzionamento sicuro. Di seguito \u00e8 riportato un\u00a0<strong>analisi dettagliata<\/strong>\u00a0dei tassi di perdita ammissibili per diversi tipi di valvole.<\/p>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"1_API_598_Leakage_Test_Overview\"><\/span><strong>1. Panoramica del test di tenuta API 598<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Scopo:<\/strong>\u00a0Verificare la tenuta delle sedi delle valvole (test di chiusura).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Metodi di prova:<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Test con liquidi (acqua\/cherosene):<\/strong>\u00a0Misura le perdite in\u00a0<strong>mL\/min<\/strong>.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Prova dell&#039;aria (gas a bassa pressione):<\/strong>\u00a0Misura le perdite in\u00a0<strong>bolle\/min<\/strong>\u00a0(tramite tubo a bolle).<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Pressione di prova:<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Liquido:<\/strong>\u00a01,1 \u00d7 pressione nominale della valvola (o come specificato).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Aria:<\/strong>\u00a050\u201360 psi (3,5\u20134,1 bar).<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"2_Allowable_Leakage_Rates_by_Valve_Type\"><\/span><strong>2. Tassi di perdita ammissibili per tipo di valvola<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"A_Metal-Seated_Valves\"><\/span><strong>A. Valvole con sede metallica<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><em>(Valvole a saracinesca, a globo, di ritegno e a otturatore)<\/em><\/p>\n<div class=\"markdown-table-wrapper\">\n<table>\n<thead>\n<tr>\n<th><strong>Dimensioni della valvola (NPS)<\/strong><\/th>\n<th><strong>Perdita massima (test del liquido)<\/strong><\/th>\n<th><strong>Perdita massima (test in aria)<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u2264 2\u2033<\/td>\n<td>0 (a tenuta stagna*)<\/td>\n<td>\u2264 12 bolle\/min<\/td>\n<\/tr>\n<tr>\n<td>2,5\u2033 \u2013 6\u2033<\/td>\n<td>\u2264 12 mL\/min<\/td>\n<td>\u2264 24 bolle\/min<\/td>\n<\/tr>\n<tr>\n<td>8\u2033 \u2013 10\u2033<\/td>\n<td>\u2264 20 mL\/min<\/td>\n<td>\u2264 40 bolle\/min<\/td>\n<\/tr>\n<tr>\n<td>\u2265 12\u2033<\/td>\n<td>\u2264 28 mL\/min<\/td>\n<td>\u2264 60 bolle\/min<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ds-markdown-paragraph\">*A tenuta stagna = Nessuna perdita visibile nel test con liquidi.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Key_Notes_for_Metal_Seats\"><\/span><strong>Note importanti per i sedili in metallo:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Valvole a saracinesca\/a globo:<\/strong>\u00a0Le perdite aumentano con le dimensioni a causa delle superfici di seduta pi\u00f9 ampie.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Valvole di ritegno:<\/strong>\u00a0Testato in direzione di flusso inversa (simulando il riflusso).<\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"B_Soft-Seated_Valves\"><\/span><strong>B. Valvole con sede morbida<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\"><em>(Valvole a sfera, a farfalla e a membrana con sedi elastomeriche)<\/em><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Perdita accettabile:<\/strong>\u00a0<strong>Zero (a tenuta stagna)<\/strong>\u00a0In\u00a0<strong>Entrambi<\/strong>\u00a0prove su liquidi e aria.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Motivo:<\/strong>\u00a0Gli elastomeri (ad esempio, PTFE, EPDM) garantiscono una tenuta pressoch\u00e9 perfetta.<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"3_Testing_Procedures\"><\/span><strong>3. Procedure di prova<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Step-by-Step_Seat_Leakage_Test\"><\/span><strong>Test di tenuta del sedile passo dopo passo<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol start=\"1\">\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Posizione della valvola:<\/strong>\u00a0Completamente chiuso.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Pressurizzare:<\/strong>\u00a0Applicare la pressione di prova a monte.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Perdita di breve durata:<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Test del liquido:<\/strong>\u00a0Raccogliere e misurare le perdite a valle (mL\/min).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Test di volo:<\/strong>\u00a0Immergere a valle nell&#039;acqua; contare le bolle al minuto.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Durata:<\/strong>\u00a0In genere\u00a0<strong>1 minuto<\/strong>\u00a0(pi\u00f9 lungo per le valvole di grandi dimensioni).<\/p>\n<\/li>\n<\/ol>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"4_Industry_Variations_Comparisons\"><\/span><strong>4. Variazioni e confronti tra i settori<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"markdown-table-wrapper\">\n<table>\n<thead>\n<tr>\n<th><strong>Standard<\/strong><\/th>\n<th><strong>Criteri di perdita<\/strong><\/th>\n<th><strong>Differenze chiave<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>API598<\/strong><\/td>\n<td>Definito in base al tipo\/dimensione della valvola<\/td>\n<td>Pi\u00f9 comune nel settore petrolifero e del gas.<\/td>\n<\/tr>\n<tr>\n<td><strong>ISO 5208<\/strong><\/td>\n<td>Classifiche da A (pi\u00f9 stretta) a G (pi\u00f9 larga)<\/td>\n<td>Classi pi\u00f9 granulari.<\/td>\n<\/tr>\n<tr>\n<td><strong>ASME B16.34<\/strong><\/td>\n<td>Riferimenti API 598<\/td>\n<td>Si concentra sulle valutazioni di pressione e temperatura.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"5_Common_Failure_Causes_Fixes\"><\/span><strong>5. Cause comuni di guasto e relative soluzioni<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Perdite eccessive?<\/strong>\u00a0Verificare quanto segue:<\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Danni al sedile:<\/strong>\u00a0Erosione, graffi o corrosione.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Disallineamento del cuneo\/disco:<\/strong>\u00a0Comunemente utilizzato nelle valvole a saracinesca\/a globo.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Legame termico:<\/strong>\u00a0Sedili metallici espandibili\/retraibili.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Soluzioni:<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Rivestire o sostituire i sedili.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Regolare la coppia dell&#039;attuatore.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Passa a\u00a0<strong>cuneo flessibile<\/strong>\u00a0(per applicazioni termiche).<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"6_Practical_Tips_for_Engineers\"><\/span><strong>6. Consigli pratici per gli ingegneri<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Per i servizi di emergenza:<\/strong>\u00a0Specificare\u00a0<strong>sedili morbidi<\/strong>\u00a0se \u00e8 richiesta una perdita pari a zero.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Applicazioni ad alta temperatura:<\/strong>\u00a0Utilizzo\u00a0<strong>cunei flessibili<\/strong>\u00a0per evitare inceppamenti.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Frequenza dei test:<\/strong>\u00a0Secondo API 598, test\u00a0<strong>ogni 2-5 anni<\/strong>\u00a0o dopo la manutenzione.<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h3><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusione<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ds-markdown-paragraph\">I tassi di perdita della sede API 598 garantiscono che le valvole soddisfino\u00a0<strong>standard di sicurezza e prestazioni<\/strong>\u00a0in settori esigenti. Gli ingegneri devono:<br \/>\n\u2714\u00a0<strong>Scegli il materiale giusto per la seduta<\/strong>\u00a0(metallo contro morbido).<br \/>\n\u2714\u00a0<strong>Attenersi ai protocolli di test appropriati.<\/strong>.<br \/>\n\u2714\u00a0<strong>Monitorare l&#039;usura nelle applicazioni ad alto ciclo di utilizzo.<\/strong>.<\/p>\n<p class=\"ds-markdown-paragraph\"><strong>Hai bisogno di un calcolatore del tasso di perdita o di una guida alla risoluzione dei problemi? Chiedi pure qui sotto!<\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>API 598 Valve Seat Leakage Rates \u2013 Engineer\u2019s Guide API 598 is the\u00a0industry standard for valve testing, ensuring sealing integrity under pressure. For engineers, understanding\u00a0seat leakage acceptance criteria\u00a0is critical for compliance and safe operation. Below is a\u00a0detailed breakdown\u00a0of allowable leakage rates for different valve types. 1. API 598 Leakage Test Overview Purpose:\u00a0Verify sealing performance of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[634],"class_list":["post-18528","post","type-post","status-publish","format-standard","hentry","category-industry-news","tag-api-598-valve-seat-leakage"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/posts\/18528","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/comments?post=18528"}],"version-history":[{"count":1,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/posts\/18528\/revisions"}],"predecessor-version":[{"id":18529,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/posts\/18528\/revisions\/18529"}],"wp:attachment":[{"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/media?parent=18528"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/categories?post=18528"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/tags?post=18528"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}