{"id":8775,"date":"2026-01-05T20:17:03","date_gmt":"2026-01-05T12:17:03","guid":{"rendered":"https:\/\/www.stvvalves.com\/?p=8775"},"modified":"2026-01-05T20:17:03","modified_gmt":"2026-01-05T12:17:03","slug":"nace-compliant-valve-essential-guide-for-sour-service-applications","status":"publish","type":"post","link":"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/","title":{"rendered":"NACE Compliant Valve: Essential Guide for Sour Service Applications"},"content":{"rendered":"<section id=\"introduction\">\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 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\">Table of Contents<\/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;\">Toggle<\/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-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#NACE_Compliant_Valve_Essential_Guide_for_Sour_Service_Applications\" >NACE Compliant Valve: Essential Guide for Sour Service Applications<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#What_is_a_NACE_Compliant_Valve\" >What is a NACE Compliant Valve?<\/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.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Understanding_NACE_Standards_for_Valve_Compliance\" >Understanding NACE Standards for Valve Compliance<\/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:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#NACE_MR0175ISO_15156\" >NACE MR0175\/ISO 15156<\/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:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Function_1_Manufacturer_Responsibility\" >Function 1: Manufacturer Responsibility<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Function_2_End-User_Responsibility\" >Function 2: End-User Responsibility<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#NACE_MR0103ISO_17945\" >NACE MR0103\/ISO 17945<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Key_Material_Requirements_for_NACE_Compliant_Valves\" >Key Material Requirements for NACE Compliant Valves<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Material_Selection_Criteria\" >Material Selection Criteria<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Heat_Treatment_Requirements\" >Heat Treatment Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Welding_and_Fabrication_Controls\" >Welding and Fabrication Controls<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Valve_Types_and_Applications_in_Sour_Service\" >Valve Types and Applications in Sour Service<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Gate_Valves\" >Gate Valves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Ball_Valves\" >\u0428\u0430\u0440\u043e\u0432\u044b\u0435 \u043a\u0440\u0430\u043d\u044b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Check_Valves\" >\u041e\u0431\u0440\u0430\u0442\u043d\u044b\u0435 \u043a\u043b\u0430\u043f\u0430\u043d\u044b<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Common_Applications\" >Common Applications<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Specifying_and_Verifying_NACE_Compliant_Valves\" >Specifying and Verifying NACE Compliant Valves<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Proper_Specification_Requirements\" >Proper Specification Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Documentation_and_Verification\" >Documentation and Verification<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Benefits_of_Using_NACE_Compliant_Valves\" >Benefits of Using NACE Compliant Valves<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Benefits_of_NACE_Compliant_Valves\" >Benefits of NACE Compliant Valves<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.stvvalves.com\/ru\/nace-compliant-valve-essential-guide-for-sour-service-applications\/#Conclusion\" >\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"NACE_Compliant_Valve_Essential_Guide_for_Sour_Service_Applications\"><\/span>NACE Compliant Valve: Essential Guide for Sour Service Applications<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>In industrial valve applications where hydrogen sulfide (H\u2082S) is present, selecting the right NACE compliant valve is critical for operational safety, equipment longevity, and regulatory compliance. This comprehensive guide explores the requirements, standards, and specifications that define NACE compliance, helping engineers and procurement specialists make informed decisions when selecting valves for sour service environments.<\/p>\n<div id=\"attachment_8776\" style=\"width: 1040px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-8776\" class=\"wp-image-8776 size-large\" src=\"https:\/\/www.stvvalves.com\/wp-content\/uploads\/2026\/01\/NACE-Compliant-Valve-with-certification-1030x773.jpg\" alt=\"NACE Compliant Valve\" width=\"1030\" height=\"773\" srcset=\"https:\/\/www.stvvalves.com\/wp-content\/uploads\/2026\/01\/NACE-Compliant-Valve-with-certification-1030x773.jpg 1030w, https:\/\/www.stvvalves.com\/wp-content\/uploads\/2026\/01\/NACE-Compliant-Valve-with-certification-300x225.jpg 300w, https:\/\/www.stvvalves.com\/wp-content\/uploads\/2026\/01\/NACE-Compliant-Valve-with-certification-768x576.jpg 768w, https:\/\/www.stvvalves.com\/wp-content\/uploads\/2026\/01\/NACE-Compliant-Valve-with-certification-1536x1152.jpg 1536w, https:\/\/www.stvvalves.com\/wp-content\/uploads\/2026\/01\/NACE-Compliant-Valve-with-certification-16x12.jpg 16w, https:\/\/www.stvvalves.com\/wp-content\/uploads\/2026\/01\/NACE-Compliant-Valve-with-certification-1500x1125.jpg 1500w, https:\/\/www.stvvalves.com\/wp-content\/uploads\/2026\/01\/NACE-Compliant-Valve-with-certification-705x529.jpg 705w, https:\/\/www.stvvalves.com\/wp-content\/uploads\/2026\/01\/NACE-Compliant-Valve-with-certification-450x338.jpg 450w, https:\/\/www.stvvalves.com\/wp-content\/uploads\/2026\/01\/NACE-Compliant-Valve-with-certification-600x450.jpg 600w, https:\/\/www.stvvalves.com\/wp-content\/uploads\/2026\/01\/NACE-Compliant-Valve-with-certification.jpg 1600w\" sizes=\"auto, (max-width: 1030px) 100vw, 1030px\" \/><p id=\"caption-attachment-8776\" class=\"wp-caption-text\">NACE Compliant Valve<\/p><\/div>\n<\/section>\n<section id=\"what-is-nace-compliant-valve\">\n<h2><span class=\"ez-toc-section\" id=\"What_is_a_NACE_Compliant_Valve\"><\/span>What is a NACE Compliant Valve?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A NACE compliant valve is designed and manufactured to meet the requirements specified in NACE MR0175\/ISO 15156 and NACE MR0103\/ISO 17945 standards. These standards establish the criteria for materials used in equipment exposed to sour environments containing hydrogen sulfide (H\u2082S), which can cause sulfide stress cracking (SSC) and other forms of corrosion-related damage.<\/p>\n<p>The term &#8220;sour service&#8221; refers to environments where equipment is exposed to fluids containing H\u2082S in the presence of water. In these conditions, hydrogen atoms can penetrate high-strength metals and heat affected zones (HAZs), particularly in areas that haven&#8217;t been properly stress-relieved. As hydrogen accumulates within the material, internal pressure builds up, eventually leading to cracks and potential catastrophic failure.<\/p>\n<div class=\"img-container\">\n<div class=\"image-embed\" contenteditable=\"false\" data-image=\"%7B%22src%22%3A%22https%3A%2F%2Fstorage.googleapis.com%2F48877118-7272-4a4d-b302-0465d8aa4548%2F7c0162ef-88b5-4cf7-9ba9-cc48ad7031d3%2Fe6f40111-1be1-44cb-9286-22007d0ccf46.jpg%22%2C%22title%22%3A%22Hydrogen%20induced%20cracking%20in%20a%20non-NACE%20compliant%20valve%20component%22%2C%22method%22%3A%22text-to-image%22%2C%22date%22%3A1767614929100%7D\">\n<div class=\"_Media_1itgw_1 _ImageEmbed_1itgw_28\">\n<div class=\"_Buttons_1itgw_5\" contenteditable=\"false\" data-media=\"true\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>Using properly specified NACE compliant valves helps prevent these failure mechanisms by ensuring that materials, manufacturing processes, and heat treatments meet strict requirements for resistance to hydrogen damage. This compliance is particularly crucial in applications such as:<\/p>\n<ul class=\"custom-list\">\n<li>Offshore oil and gas production platforms<\/li>\n<li>Sour gas processing facilities<\/li>\n<li>Refineries processing high-sulfur crude oil<\/li>\n<li>Petrochemical plants handling H\u2082S-containing streams<\/li>\n<li>Natural gas sweetening units<\/li>\n<\/ul>\n<\/section>\n<section id=\"nace-standards\">\n<h2><span class=\"ez-toc-section\" id=\"Understanding_NACE_Standards_for_Valve_Compliance\"><\/span>Understanding NACE Standards for Valve Compliance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"NACE_MR0175ISO_15156\"><\/span>NACE MR0175\/ISO 15156<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Originally released in 1975, NACE MR0175 has undergone several revisions before being merged with ISO 15156 in 2003. This standard specifically addresses materials for use in H\u2082S-containing environments in oil and gas production and related processing facilities. The 2003 revision significantly expanded the scope to include:<\/p>\n<ul class=\"custom-list\">\n<li>Requirements for resistance to sulfide stress cracking<\/li>\n<li>Guidelines for preventing chloride stress corrosion cracking<\/li>\n<li>New restrictions and requirements for Corrosion Resistant Alloys (CRAs)<\/li>\n<\/ul>\n<div class=\"img-container\">\n<div class=\"image-embed\" contenteditable=\"false\" data-image=\"%7B%22src%22%3A%22https%3A%2F%2Fstorage.googleapis.com%2F48877118-7272-4a4d-b302-0465d8aa4548%2F7c0162ef-88b5-4cf7-9ba9-cc48ad7031d3%2F34abbb8a-725e-4f46-a142-51fa0d17dbd6.jpg%22%2C%22title%22%3A%22NACE%20MR0175%2FISO%2015156%20standard%20document%20being%20referenced%20by%20an%20engineer%22%2C%22method%22%3A%22insert%22%2C%22date%22%3A1767614929000%7D\">\n<div class=\"_Media_1itgw_1 _ImageEmbed_1itgw_28\">\n<div class=\"_Buttons_1itgw_5\" contenteditable=\"false\" data-media=\"true\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>A critical change in the 2003 revision was the division of material acceptability determination into two separate functions:<\/p>\n<div class=\"two-columns\">\n<div class=\"column-card\">\n<h4><span class=\"ez-toc-section\" id=\"Function_1_Manufacturer_Responsibility\"><\/span>Function 1: Manufacturer Responsibility<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>The valve manufacturer must ensure that materials meet all metallurgical and manufacturing requirements to be permissible for sour service use. This includes proper heat treatment, hardness control, and material composition verification.<\/p>\n<\/div>\n<div class=\"column-card\">\n<h4><span class=\"ez-toc-section\" id=\"Function_2_End-User_Responsibility\"><\/span>Function 2: End-User Responsibility<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>The end-user must verify valve compatibility based on specific service environment parameters such as pH, chloride concentration, temperature, and H\u2082S partial pressure to ensure the selected materials will perform adequately in the actual operating conditions.<\/p>\n<\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"NACE_MR0103ISO_17945\"><\/span>NACE MR0103\/ISO 17945<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>While <a href=\"https:\/\/qrcvalves.com\/nace-compliant-valve\/\" target=\"_blank\" rel=\"noopener\">MR0175<\/a> primarily addresses upstream oil and gas production environments, NACE MR0103 focuses on downstream refining and gas processing applications. This standard defines the material requirements for resistance to sulfide stress cracking in sour petroleum refining environments.<\/p>\n<p>According to MR0103, materials require qualification for sour service if any of these conditions exist:<\/p>\n<ul class=\"custom-list\">\n<li>Free water with dissolved H\u2082S exceeding 50 ppmw<\/li>\n<li>Free water with pH below 4 and some dissolved H\u2082S present<\/li>\n<li>Free water with pH above 7.6, more than 20 ppmw hydrogen cyanide ion (HCN), and some H\u2082S dissolved in the water<\/li>\n<li>H\u2082S partial pressure greater than 0.0003 MPa abs (0.05 psia) in a process with a gas phase<\/li>\n<\/ul>\n<div class=\"img-container\">\n<div class=\"image-embed\" contenteditable=\"false\" data-image=\"%7B%22src%22%3A%22https%3A%2F%2Fstorage.googleapis.com%2F48877118-7272-4a4d-b302-0465d8aa4548%2F7c0162ef-88b5-4cf7-9ba9-cc48ad7031d3%2F44bba2ac-5926-4fa1-acd1-1cd66e49fb40.jpg%22%2C%22title%22%3A%22Refinery%20processing%20equipment%20requiring%20NACE%20MR0103%20compliant%20valves%22%2C%22method%22%3A%22text-to-image%22%2C%22date%22%3A1767614928900%7D\">\n<div class=\"_Media_1itgw_1 _ImageEmbed_1itgw_28\">\n<div class=\"_Buttons_1itgw_5\" contenteditable=\"false\" data-media=\"true\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"material-requirements\">\n<h2><span class=\"ez-toc-section\" id=\"Key_Material_Requirements_for_NACE_Compliant_Valves\"><\/span>Key Material Requirements for NACE Compliant Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Material_Selection_Criteria\"><\/span>Material Selection Criteria<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Selecting appropriate materials is the foundation of NACE compliance. Different material categories have specific requirements regarding composition, heat treatment, and hardness limits:<\/p>\n<div class=\"table-container\">\n<table class=\"responsive-table responsive-table-striped\">\n<thead>\n<tr>\n<td data-row=\"head\">Material Category<\/td>\n<td data-row=\"head\">Common Examples<\/td>\n<td data-row=\"head\">Maximum Hardness<\/td>\n<td data-row=\"head\">Key Requirements<\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td data-label=\"Material Category\">Carbon Steels<\/td>\n<td data-label=\"Common Examples\">A105, A216 WCB<\/td>\n<td data-label=\"Maximum Hardness\">22 HRC \/ 237 HBW<\/td>\n<td data-label=\"Key Requirements\">Proper heat treatment, controlled welding procedures<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Material Category\">Low Alloy Steels<\/td>\n<td data-label=\"Common Examples\">F22, 4130<\/td>\n<td data-label=\"Maximum Hardness\">22 HRC \/ 237 HBW<\/td>\n<td data-label=\"Key Requirements\">Strict heat treatment, PWHT for welds<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Material Category\">Martensitic Stainless<\/td>\n<td data-label=\"Common Examples\">F6a, CA15<\/td>\n<td data-label=\"Maximum Hardness\">22-23 HRC<\/td>\n<td data-label=\"Key Requirements\">Double tempering, controlled chemistry<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Material Category\">Austenitic Stainless<\/td>\n<td data-label=\"Common Examples\">316\/316L, CF8M<\/td>\n<td data-label=\"Maximum Hardness\">Not specified*<\/td>\n<td data-label=\"Key Requirements\">Solution annealed condition, environmental limits<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Material Category\">Duplex Stainless<\/td>\n<td data-label=\"Common Examples\">F51, CD3MN<\/td>\n<td data-label=\"Maximum Hardness\">28-32 HRC<\/td>\n<td data-label=\"Key Requirements\">Controlled ferrite content, solution annealing<\/td>\n<\/tr>\n<tr>\n<td data-label=\"Material Category\">Nickel Alloys<\/td>\n<td data-label=\"Common Examples\">Inconel 625, Monel 400<\/td>\n<td data-label=\"Maximum Hardness\">Varies by alloy<\/td>\n<td data-label=\"Key Requirements\">Solution annealed, controlled chemistry<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>*While austenitic stainless steels don&#8217;t have specific hardness requirements, they must be in the solution annealed condition and may have environmental limitations.<\/p>\n<div class=\"img-container\">\n<div class=\"image-embed\" contenteditable=\"false\" data-image=\"%7B%22src%22%3A%22https%3A%2F%2Fstorage.googleapis.com%2F48877118-7272-4a4d-b302-0465d8aa4548%2F7c0162ef-88b5-4cf7-9ba9-cc48ad7031d3%2F1b01c6c9-d9b3-4de8-9cd3-d9d76550684a.jpg%22%2C%22title%22%3A%22Hardness%20testing%20being%20performed%20on%20a%20NACE%20compliant%20valve%20component%22%2C%22method%22%3A%22text-to-image%22%2C%22date%22%3A1767614928800%7D\">\n<div class=\"_Media_1itgw_1 _ImageEmbed_1itgw_28\">\n<div class=\"_Buttons_1itgw_5\" contenteditable=\"false\" data-media=\"true\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Heat_Treatment_Requirements\"><\/span>Heat Treatment Requirements<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Heat treatment is critical for achieving the microstructure and hardness necessary for NACE compliance. The standards specify acceptable heat treatment processes for each material category:<\/p>\n<ul class=\"custom-list\">\n<li>Carbon and low-alloy steels may be hot-rolled, annealed, normalized, or quenched and tempered<\/li>\n<li>Martensitic stainless steels typically require double tempering to achieve the required microstructure<\/li>\n<li>Austenitic stainless steels must be solution annealed<\/li>\n<li>Duplex stainless steels require solution annealing with controlled cooling rates<\/li>\n<li>Cold-worked materials with outer fiber deformation exceeding 5% must undergo stress relief heat treatment<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Welding_and_Fabrication_Controls\"><\/span>Welding and Fabrication Controls<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Welding processes must be carefully controlled to prevent hardness increases in heat-affected zones (HAZs). Key requirements include:<\/p>\n<ul class=\"custom-list\">\n<li>Post-weld heat treatment (PWHT) for carbon and low-alloy steels<\/li>\n<li>Weld deposit hardness limits (typically 200-250 HBW maximum)<\/li>\n<li>Qualification of welding procedures with hardness testing<\/li>\n<li>Controlled chemistry of weld consumables<\/li>\n<li>Proper documentation of all welding parameters and test results<\/li>\n<\/ul>\n<div class=\"img-container\"><\/div>\n<\/section>\n<section id=\"valve-types\">\n<h2><span class=\"ez-toc-section\" id=\"Valve_Types_and_Applications_in_Sour_Service\"><\/span>Valve Types and Applications in Sour Service<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Various valve types can be manufactured to meet NACE requirements, each suited for specific applications in sour service environments:<\/p>\n<div class=\"three-columns\">\n<div class=\"column-card\">\n<h4><span class=\"ez-toc-section\" id=\"Gate_Valves\"><\/span><a href=\"https:\/\/www.stvvalves.com\/ru\/wholesale\/gate-valve\/stainless-steel-gate-valve\/\">Gate Valves<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<div class=\"img-container\"><\/div>\n<p>Commonly used for on\/off service in pipelines and process lines. Critical components include the body, bonnet, stem, and wedge, all of which must meet NACE material requirements.<\/p>\n<\/div>\n<div class=\"column-card\">\n<h4><span class=\"ez-toc-section\" id=\"Ball_Valves\"><\/span><a href=\"https:\/\/www.stvvalves.com\/ru\/wholesale\/ball-valve\/trunnion-ball-valve\/\">\u0428\u0430\u0440\u043e\u0432\u044b\u0435 \u043a\u0440\u0430\u043d\u044b<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<div class=\"img-container\"><\/div>\n<p>Ideal for quick operation and tight shutoff in sour gas applications. The ball, seats, stem, and body materials must all be selected for H\u2082S resistance.<\/p>\n<\/div>\n<div class=\"column-card\">\n<h4><span class=\"ez-toc-section\" id=\"Check_Valves\"><\/span><a href=\"https:\/\/www.stvvalves.com\/ru\/wholesale\/check-valves\/swing-check-valve\/\">\u041e\u0431\u0440\u0430\u0442\u043d\u044b\u0435 \u043a\u043b\u0430\u043f\u0430\u043d\u044b<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<div class=\"img-container\"><\/div>\n<p>Used to prevent backflow in sour service pipelines. The disc, hinge, and body must all meet NACE material and hardness requirements.<\/p>\n<\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Common_Applications\"><\/span>Common Applications<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>NACE compliant valves are essential in numerous critical applications across the oil, gas, and petrochemical industries:<\/p>\n<ul class=\"custom-list\">\n<li>Wellhead and Christmas tree assemblies in sour oil and gas fields<\/li>\n<li>Sour gas gathering systems and transmission pipelines<\/li>\n<li>Amine treatment units for H\u2082S removal<\/li>\n<li>Sour water stripping units in refineries<\/li>\n<li>Sulfur recovery units and tail gas treatment facilities<\/li>\n<li>High-pressure acid gas injection systems<\/li>\n<li>Offshore platforms processing sour hydrocarbons<\/li>\n<\/ul>\n<div class=\"img-container\"><\/div>\n<\/section>\n<section id=\"specification\">\n<h2><span class=\"ez-toc-section\" id=\"Specifying_and_Verifying_NACE_Compliant_Valves\"><\/span>Specifying and Verifying NACE Compliant Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Proper_Specification_Requirements\"><\/span>Proper Specification Requirements<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When specifying NACE compliant valves, it&#8217;s essential to clearly communicate the following information:<\/p>\n<ul class=\"custom-list\">\n<li>The specific NACE standard and revision required (e.g., &#8220;NACE MR0175\/ISO 15156:2020&#8221;)<\/li>\n<li>Service conditions including H\u2082S concentration, pH, chloride content, and temperature<\/li>\n<li>Material requirements for all pressure-containing and pressure-controlling components<\/li>\n<li>Hardness testing requirements and acceptance criteria<\/li>\n<li>Documentation requirements for material certification and testing<\/li>\n<li>Special requirements for welding, heat treatment, and non-destructive examination<\/li>\n<\/ul>\n<div class=\"img-container\"><\/div>\n<h3><span class=\"ez-toc-section\" id=\"Documentation_and_Verification\"><\/span>Documentation and Verification<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Proper documentation is crucial for verifying NACE compliance. Key documents include:<\/p>\n<ul class=\"custom-list\">\n<li>Material Test Reports (MTRs) showing chemical composition and mechanical properties<\/li>\n<li>Hardness test reports for all pressure-containing and pressure-controlling components<\/li>\n<li>Heat treatment certification documenting time, temperature, and cooling rates<\/li>\n<li>Welding procedure specifications (WPS) and procedure qualification records (PQR)<\/li>\n<li>Non-destructive examination reports<\/li>\n<li>NACE compliance certification from the manufacturer<\/li>\n<\/ul>\n<p>It&#8217;s important to note that simply specifying &#8220;stainless steel&#8221; is insufficient for NACE compliance. Each material must meet specific requirements for composition, heat treatment, and hardness to be considered compliant.<\/p>\n<\/section>\n<section id=\"benefits\">\n<h2><span class=\"ez-toc-section\" id=\"Benefits_of_Using_NACE_Compliant_Valves\"><\/span>Benefits of Using NACE Compliant Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"pros-cons\">\n<div class=\"pros\">\n<h3 class=\"pros-title\"><span class=\"ez-toc-section\" id=\"Benefits_of_NACE_Compliant_Valves\"><\/span>Benefits of NACE Compliant Valves<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Enhanced safety through reduced risk of catastrophic failure<\/li>\n<li>Extended service life in corrosive environments<\/li>\n<li>Reduced maintenance costs and unplanned downtime<\/li>\n<li>Compliance with industry regulations and standards<\/li>\n<li>Improved reliability in critical applications<\/li>\n<li>Reduced environmental and safety risks<\/li>\n<li>Lower total cost of ownership over equipment lifecycle<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"img-container\"><\/div>\n<p>The investment in properly specified NACE compliant valves pays dividends through improved safety, reliability, and reduced lifecycle costs. This is particularly important in remote or hard-to-access locations like offshore platforms, where intervention costs can be substantial.<\/p>\n<\/section>\n<section id=\"conclusion\">\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Selecting the right NACE compliant valve for sour service applications requires a thorough understanding of the applicable standards, material requirements, and service conditions. By ensuring proper material selection, heat treatment, hardness control, and manufacturing processes, operators can significantly reduce the risk of sulfide stress cracking and other forms of hydrogen damage in H\u2082S environments.<\/p>\n<p>The consequences of using non-compliant valves in sour service can be severe, including equipment failure, environmental releases, and safety incidents. Therefore, it&#8217;s essential to work with knowledgeable suppliers who understand the complexities of NACE compliance and can provide properly certified equipment for these critical applications.<\/p>\n<\/section>","protected":false},"excerpt":{"rendered":"<p>NACE Compliant Valve: Essential Guide for Sour Service Applications In industrial valve applications where hydrogen sulfide (H\u2082S) is present, selecting the right NACE compliant valve is critical for operational safety, equipment longevity, and regulatory compliance. This comprehensive guide explores the requirements, standards, and specifications that define NACE compliance, helping engineers and procurement specialists make informed [&hellip;]<\/p>\n","protected":false},"author":290641,"featured_media":8776,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[3966,3968,3964,3967,3965],"class_list":["post-8775","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-news","tag-corrosion-resistant-valves","tag-mr0175","tag-nace-standards","tag-oil-and-gas-equipment","tag-valve-selection"],"_links":{"self":[{"href":"https:\/\/www.stvvalves.com\/ru\/wp-json\/wp\/v2\/posts\/8775","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.stvvalves.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.stvvalves.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.stvvalves.com\/ru\/wp-json\/wp\/v2\/users\/290641"}],"replies":[{"embeddable":true,"href":"https:\/\/www.stvvalves.com\/ru\/wp-json\/wp\/v2\/comments?post=8775"}],"version-history":[{"count":2,"href":"https:\/\/www.stvvalves.com\/ru\/wp-json\/wp\/v2\/posts\/8775\/revisions"}],"predecessor-version":[{"id":8778,"href":"https:\/\/www.stvvalves.com\/ru\/wp-json\/wp\/v2\/posts\/8775\/revisions\/8778"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.stvvalves.com\/ru\/wp-json\/wp\/v2\/media\/8776"}],"wp:attachment":[{"href":"https:\/\/www.stvvalves.com\/ru\/wp-json\/wp\/v2\/media?parent=8775"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.stvvalves.com\/ru\/wp-json\/wp\/v2\/categories?post=8775"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.stvvalves.com\/ru\/wp-json\/wp\/v2\/tags?post=8775"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}