{"id":1050,"date":"2026-04-22T20:12:25","date_gmt":"2026-04-23T00:12:25","guid":{"rendered":"https:\/\/www.songhaiflange.com\/?p=1050"},"modified":"2026-04-22T20:21:24","modified_gmt":"2026-04-23T00:21:24","slug":"slip-on-vs-weld-neck-flange-comparison-high-pressure-alloy-steel-guide","status":"publish","type":"post","link":"https:\/\/www.songhaiflange.com\/ru\/2026\/04\/22\/slip-on-vs-weld-neck-flange-comparison-high-pressure-alloy-steel-guide\/","title":{"rendered":"Slip On vs Weld Neck Flange Comparison High Pressure Alloy Steel Guide"},"content":{"rendered":"<h2>Slip On vs Weld Neck Flange Complete Comparison<\/h2>\n<p>Choosing between slip on and weld neck flanges depends on pressure requirements, budget constraints, and application specifics. This guide helps you make the right selection for your industrial pipeline.<\/p>\n<h3>Structural Differences<\/h3>\n<h4>Slip On Flange Design<\/h4>\n<ul>\n<li>Flat hub with slightly larger bore than pipe OD<\/li>\n<li>Slides over pipe end for fillet welding<\/li>\n<li>\u0421\u0432\u0430\u0440\u043a\u0430 \u0441 \u0432\u043d\u0443\u0442\u0440\u0435\u043d\u043d\u0435\u0439 \u0438 \u0432\u043d\u0435\u0448\u043d\u0435\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u044b<\/li>\n<li>\u0411\u043e\u043b\u0435\u0435 \u043f\u0440\u043e\u0441\u0442\u043e\u0439 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441<\/li>\n<\/ul>\n<h4>Weld Neck Flange Design<\/h4>\n<ul>\n<li>\u0414\u043b\u0438\u043d\u043d\u0430\u044f \u043a\u043e\u043d\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0432\u0442\u0443\u043b\u043a\u0430 \u0434\u043b\u044f \u0441\u0442\u044b\u043a\u043e\u0432\u043e\u0439 \u0441\u0432\u0430\u0440\u043a\u0438<\/li>\n<li>Gradual stress transition from flange to pipe<\/li>\n<li>Full penetration weld for maximum strength<\/li>\n<li>More complex forging and machining<\/li>\n<\/ul>\n<h3>Performance Comparison<\/h3>\n<table>\n<tr>\n<th>\u0424\u0430\u043a\u0442\u043e\u0440<\/th>\n<th>\u0421\u043a\u043e\u043b\u044c\u0437\u044f\u0449\u0438\u0439<\/th>\n<th>\u0421\u0432\u0430\u0440\u043d\u0430\u044f \u0433\u043e\u0440\u043b\u043e\u0432\u0438\u043d\u0430<\/th>\n<\/tr>\n<tr>\n<td>\u041f\u0435\u0440\u0432\u043e\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u0430\u044f \u0441\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c<\/td>\n<td>30-40% \u043d\u0438\u0436\u043d\u0438\u0439<\/td>\n<td>Higher<\/td>\n<\/tr>\n<tr>\n<td>Installation Cost<\/td>\n<td>Lower (easier alignment)<\/td>\n<td>Higher (welding skill)<\/td>\n<\/tr>\n<tr>\n<td>\u041d\u043e\u043c\u0438\u043d\u0430\u043b\u044c\u043d\u043e\u0435 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u0435<\/td>\n<td>Medium (Class 150-600)<\/td>\n<td>High (Class 150-2500)<\/td>\n<\/tr>\n<tr>\n<td>\u0423\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u043d\u0430\u044f \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c<\/td>\n<td>\u0423\u043c\u0435\u0440\u0435\u043d\u043d\u044b\u0439<\/td>\n<td>\u041f\u0440\u0435\u0432\u043e\u0441\u0445\u043e\u0434\u043d\u043e<\/td>\n<\/tr>\n<tr>\n<td>\u0414\u0438\u0430\u043f\u0430\u0437\u043e\u043d \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440<\/td>\n<td>-20 to 400\u00b0C<\/td>\n<td>-200 to 800\u00b0C<\/td>\n<\/tr>\n<tr>\n<td>\u0426\u0438\u043a\u043b\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0430<\/td>\n<td>\u041d\u0435 \u0440\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0443\u0435\u0442\u0441\u044f<\/td>\n<td>\u041f\u0440\u0435\u0432\u043e\u0441\u0445\u043e\u0434\u043d\u043e<\/td>\n<\/tr>\n<\/table>\n<h3>High Pressure Alloy Steel Flanges<\/h3>\n<p>For extreme pressure and temperature applications, alloy steel flanges provide superior performance.<\/p>\n<h4>Common Alloy Materials<\/h4>\n<ul>\n<li><strong>ASTM A182 F11:<\/strong> 1.25% Chrome, 0.5% Moly<\/li>\n<li><strong>ASTM A182 F22:<\/strong> 2.25% Chrome, 1% Moly<\/li>\n<li><strong>ASTM A182 F91:<\/strong> 9% Chrome, 1% Moly, V, Nb<\/li>\n<li><strong>ASTM A335 P5:<\/strong> 5% Chrome, 0.5% Moly<\/li>\n<\/ul>\n<h4>\u041f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f<\/h4>\n<ul>\n<li>Power generation steam lines<\/li>\n<li>Petrochemical refineries<\/li>\n<li>High-pressure boilers<\/li>\n<li>Superheater and reheater piping<\/li>\n<li>Hydrogen service<\/li>\n<\/ul>\n<h4>\u041a\u043b\u0430\u0441\u0441\u044b \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u044f<\/h4>\n<ul>\n<li>\u041a\u043b\u0430\u0441\u0441 600: \u0434\u043e 110 \u0431\u0430\u0440<\/li>\n<li>\u041a\u043b\u0430\u0441\u0441 900: \u0434\u043e 165 \u0431\u0430\u0440<\/li>\n<li>\u041a\u043b\u0430\u0441\u0441 1500: \u0434\u043e 276 \u0431\u0430\u0440<\/li>\n<li>\u041a\u043b\u0430\u0441\u0441 2500: \u0434\u043e 460 \u0431\u0430\u0440<\/li>\n<\/ul>\n<h3>Flange Fitting for Water Treatment Plants<\/h3>\n<p>Water treatment facilities have specific flange requirements:<\/p>\n<h4>\u0412\u044b\u0431\u043e\u0440 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u0430<\/h4>\n<ul>\n<li><strong>\u0423\u0433\u043b\u0435\u0440\u043e\u0434\u0438\u0441\u0442\u0430\u044f \u0441\u0442\u0430\u043b\u044c (A105):<\/strong> Raw water, treated water<\/li>\n<li><strong>Stainless 304:<\/strong> Clean water, food grade<\/li>\n<li><strong>Stainless 316:<\/strong> Chlorinated water, seawater<\/li>\n<li><strong>Duplex 2205:<\/strong> Aggressive chemicals<\/li>\n<\/ul>\n<h4>Common Sizes<\/h4>\n<ul>\n<li>Small bore: DN15-DN50 (instrumentation)<\/li>\n<li>Process lines: DN80-DN300<\/li>\n<li>Main headers: DN350-DN600<\/li>\n<li>Large diameter: DN700+ (outfall)<\/li>\n<\/ul>\n<h3>\u0424\u043b\u0430\u043d\u0435\u0446 \u0441 \u0431\u0443\u0440\u043e\u0432\u044b\u043c \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u043c \u0434\u043b\u044f \u043d\u0435\u0444\u0442\u0438 \u0438 \u0433\u0430\u0437\u0430<\/h3>\n<p>Custom drilling patterns ensure compatibility with existing infrastructure:<\/p>\n<h4>Standard Drilling Patterns<\/h4>\n<ul>\n<li>ASME B16.5: US standard<\/li>\n<li>EN 1092-1: \u0435\u0432\u0440\u043e\u043f\u0435\u0439\u0441\u043a\u0438\u0439 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442<\/li>\n<li>JIS B2220: Japanese standard<\/li>\n<li>GB\/T: Chinese standard<\/li>\n<\/ul>\n<h4>Custom Drilling Services<\/h4>\n<ul>\n<li>Non-standard bolt circles<\/li>\n<li>Oversized bolt holes<\/li>\n<li>Additional tapping<\/li>\n<li>Counterboring<\/li>\n<li>Special gasket grooves<\/li>\n<\/ul>\n<h3>\u0420\u0435\u0437\u044c\u0431\u043e\u0432\u043e\u0439 \u0444\u043b\u0430\u043d\u0435\u0446 \u0434\u043b\u044f \u0442\u0440\u0443\u0431 \u043c\u0430\u043b\u043e\u0433\u043e \u0434\u0438\u0430\u043c\u0435\u0442\u0440\u0430<\/h3>\n<p>Threaded flanges offer weld-free connection for small diameter piping:<\/p>\n<h4>\u041f\u0440\u0435\u0438\u043c\u0443\u0449\u0435\u0441\u0442\u0432\u0430<\/h4>\n<ul>\n<li>\u041d\u0435 \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u0441\u0432\u0430\u0440\u043a\u0430<\/li>\n<li>\u0411\u044b\u0441\u0442\u0440\u0430\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430<\/li>\n<li>Easy maintenance access<\/li>\n<li>Suitable for hazardous areas<\/li>\n<\/ul>\n<h4>\u041e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f<\/h4>\n<ul>\n<li>Limited to NPS 4 and below<\/li>\n<li>Lower pressure rating<\/li>\n<li>Thread corrosion risk<\/li>\n<li>Not for thermal cycling<\/li>\n<\/ul>\n<h4>Thread Standards<\/h4>\n<ul>\n<li>NPT (ANSI B1.20.1): North American<\/li>\n<li>BSP (ISO 228): European\/Asian<\/li>\n<li>PT (JIS B0203): Japanese<\/li>\n<\/ul>\n<h3>\u0420\u0435\u043c\u043e\u043d\u0442 \u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u0444\u043b\u0430\u043d\u0446\u0435\u0432<\/h3>\n<p>When flanges are damaged or require modification:<\/p>\n<h4>Repair Services<\/h4>\n<ul>\n<li>Face resurfacing<\/li>\n<li>Bore machining<\/li>\n<li>Bolt hole repair<\/li>\n<li>Weld overlay<\/li>\n<li>\u0422\u0435\u0440\u043c\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0430<\/li>\n<\/ul>\n<h4>Quality Verification<\/h4>\n<ul>\n<li>\u041a\u043e\u043d\u0442\u0440\u043e\u043b\u044c \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u0432<\/li>\n<li>\u0418\u0441\u043f\u044b\u0442\u0430\u043d\u0438\u0435 \u043d\u0430 \u0442\u0432\u0435\u0440\u0434\u043e\u0441\u0442\u044c<\/li>\n<li>Surface finish measurement<\/li>\n<li>Pressure testing<\/li>\n<\/ul>\n<h3>Selection Guidelines<\/h3>\n<h4>\u0412\u044b\u0431\u0438\u0440\u0430\u0439\u0442\u0435 \u0441\u043b\u0438\u043f\u044b, \u043a\u043e\u0433\u0434\u0430:<\/h4>\n<ul>\n<li>\u0411\u044e\u0434\u0436\u0435\u0442 - \u0433\u043b\u0430\u0432\u043d\u0430\u044f \u0437\u0430\u0434\u0430\u0447\u0430<\/li>\n<li>\u041d\u0438\u0437\u043a\u043e\u0435 \u0438 \u0441\u0440\u0435\u0434\u043d\u0435\u0435 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u0435 (\u043a\u043b\u0430\u0441\u0441 150-300)<\/li>\n<li>\u041d\u0435\u043a\u0440\u0438\u0442\u0438\u0447\u043d\u044b\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f<\/li>\n<li>\u041d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c \u043b\u0435\u0433\u043a\u0438\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u0434\u043b\u044f \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u044f<\/li>\n<\/ul>\n<h4>\u0412\u044b\u0431\u0438\u0440\u0430\u0439\u0442\u0435 \u0441\u0432\u0430\u0440\u043d\u043e\u0439 \u0432\u044b\u0440\u0435\u0437, \u043a\u043e\u0433\u0434\u0430:<\/h4>\n<ul>\n<li>\u0412\u044b\u0441\u043e\u043a\u043e\u0435 \u0434\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0438\u043b\u0438 \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u0430<\/li>\n<li>\u0423\u0441\u043b\u043e\u0432\u0438\u044f \u0446\u0438\u043a\u043b\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u043d\u0430\u0433\u0440\u0443\u0436\u0435\u043d\u0438\u044f<\/li>\n<li>\u041a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u043b\u0438\u043d\u0438\u0438<\/li>\n<li>\u0422\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u0434\u043e\u043b\u0433\u043e\u0441\u0440\u043e\u0447\u043d\u0430\u044f \u043d\u0430\u0434\u0435\u0436\u043d\u043e\u0441\u0442\u044c<\/li>\n<\/ul>\n<p>Songhai Flange supplies slip on, weld neck, and threaded flanges in carbon steel, stainless steel, and alloy materials. We offer custom drilling, machining, and repair services for oil and gas, water treatment, and industrial applications.<\/p>\n<p><strong>WhatsApp:<\/strong>\u00a0+86-18658777855<br \/>\n<strong>\u042d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u043d\u0430\u044f \u043f\u043e\u0447\u0442\u0430:<\/strong>\u00a01007788887@qq.com<br \/>\n<a href=\"https:\/\/www.720yun.com\/vr\/a6ajt7ynrw0\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-884\" src=\"http:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp\" alt=\"\" width=\"1290\" height=\"2317\" title=\"\" srcset=\"https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp 1290w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-167x300.webp 167w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-570x1024.webp 570w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-768x1379.webp 768w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-855x1536.webp 855w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-1140x2048.webp 1140w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-7x12.webp 7w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-416x747.webp 416w\" sizes=\"auto, (max-width: 1290px) 100vw, 1290px\" \/><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Slip On vs Weld Neck Flange Complete Comparison Choosing between slip on and weld neck flanges depends on pressure requirements, budget constraints, and application specifics. This guide helps you make the right selection for your industrial pipeline. Structural Differences Slip On Flange Design Flat hub with slightly larger bore than pipe OD Slides over pipe [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[66,72,68,104,67],"class_list":["post-1050","post","type-post","status-publish","format-standard","hentry","category-blog","tag-flange","tag-rating","tag-slipon","tag-threaded","tag-weldneck"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/posts\/1050","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/comments?post=1050"}],"version-history":[{"count":3,"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/posts\/1050\/revisions"}],"predecessor-version":[{"id":1058,"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/posts\/1050\/revisions\/1058"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/media?parent=1050"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/categories?post=1050"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/ru\/wp-json\/wp\/v2\/tags?post=1050"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}