{"id":1016,"date":"2026-04-17T23:33:02","date_gmt":"2026-04-18T03:33:02","guid":{"rendered":"https:\/\/www.songhaiflange.com\/?p=1016"},"modified":"2026-04-17T23:42:43","modified_gmt":"2026-04-18T03:42:43","slug":"flange-pressure-rating-class-150-to-2500-pn-selection-guide","status":"publish","type":"post","link":"https:\/\/www.songhaiflange.com\/it\/2026\/04\/17\/flange-pressure-rating-class-150-to-2500-pn-selection-guide\/","title":{"rendered":"Flange Pressure Rating Class 150 to 2500 PN Selection Guide"},"content":{"rendered":"<h2>Understanding Flange Pressure Ratings<\/h2>\n<p>Flange pressure rating indicates the maximum pressure a flange can safely withstand at a specific temperature. Selecting the correct rating is critical for system safety and compliance.<\/p>\n<h3>ASME Pressure Classes<\/h3>\n<table>\n<tr>\n<th>Classe<\/th>\n<th>Max Pressure (bar)<\/th>\n<th>Max Pressure (psi)<\/th>\n<th>Typical Applications<\/th>\n<\/tr>\n<tr>\n<td>Class 150<\/td>\n<td>19.6<\/td>\n<td>285<\/td>\n<td>Low pressure water, air, general service<\/td>\n<\/tr>\n<tr>\n<td>Class 300<\/td>\n<td>51.7<\/td>\n<td>750<\/td>\n<td>Medium pressure steam, process piping<\/td>\n<\/tr>\n<tr>\n<td>Class 600<\/td>\n<td>110.4<\/td>\n<td>1600<\/td>\n<td>High pressure steam, oil and gas<\/td>\n<\/tr>\n<tr>\n<td>Class 900<\/td>\n<td>165.5<\/td>\n<td>2400<\/td>\n<td>High pressure process lines<\/td>\n<\/tr>\n<tr>\n<td>Class 1500<\/td>\n<td>275.9<\/td>\n<td>4000<\/td>\n<td>Very high pressure, wellhead equipment<\/td>\n<\/tr>\n<tr>\n<td>Class 2500<\/td>\n<td>459.8<\/td>\n<td>6670<\/td>\n<td>Extreme pressure applications<\/td>\n<\/tr>\n<\/table>\n<h3>European PN Ratings<\/h3>\n<table>\n<tr>\n<th>PN Rating<\/th>\n<th>Pressure (bar)<\/th>\n<th>Equivalent ASME Class<\/th>\n<\/tr>\n<tr>\n<td>PN6<\/td>\n<td>6<\/td>\n<td>Below Class 150<\/td>\n<\/tr>\n<tr>\n<td>PN10<\/td>\n<td>10<\/td>\n<td>Below Class 150<\/td>\n<\/tr>\n<tr>\n<td>PN16<\/td>\n<td>16<\/td>\n<td>Class 150<\/td>\n<\/tr>\n<tr>\n<td>PN25<\/td>\n<td>25<\/td>\n<td>Class 150<\/td>\n<\/tr>\n<tr>\n<td>PN40<\/td>\n<td>40<\/td>\n<td>Class 300<\/td>\n<\/tr>\n<tr>\n<td>PN63<\/td>\n<td>63<\/td>\n<td>Class 400<\/td>\n<\/tr>\n<tr>\n<td>PN100<\/td>\n<td>100<\/td>\n<td>Class 600<\/td>\n<\/tr>\n<\/table>\n<h3>Temperature Considerations<\/h3>\n<p>Pressure ratings decrease as temperature increases. A Class 150 flange rated at 285 psi at ambient temperature may only be rated at 150 psi at 400\u00b0F (204\u00b0C).<\/p>\n<h3>Material Impact on Rating<\/h3>\n<ul>\n<li><strong>Carbon Steel (A105):<\/strong> Standard pressure-temperature ratings<\/li>\n<li><strong>Stainless Steel (304\/316):<\/strong> Similar ratings, better corrosion resistance<\/li>\n<li><strong>Alloy Steel (F11\/F22):<\/strong> Maintains strength at higher temperatures<\/li>\n<li><strong>Duplex Steel:<\/strong> Higher strength allows thinner designs<\/li>\n<\/ul>\n<h3>Rating Selection Factors<\/h3>\n<ol>\n<li><strong>Design Pressure:<\/strong> Maximum expected system pressure<\/li>\n<li><strong>Design Temperature:<\/strong> Temperatura massima di esercizio<\/li>\n<li><strong>Safety Margin:<\/strong> Add 10-25% above normal operating pressure<\/li>\n<li><strong>Pressure Surges:<\/strong> Consider water hammer and transient conditions<\/li>\n<li><strong>Code Requirements:<\/strong> ASME B31.1, B31.3, or local regulations<\/li>\n<li><strong>Future Expansion:<\/strong> Allow for potential capacity increases<\/li>\n<\/ol>\n<h3>Errori comuni da evitare<\/h3>\n<ul>\n<li>Using ambient temperature rating for elevated temperature service<\/li>\n<li>Ignoring pressure surges and transient conditions<\/li>\n<li>Mixing different pressure class flanges without proper reducers<\/li>\n<li>Not considering corrosion allowance for long-term service<\/li>\n<li>Overlooking vacuum conditions (external pressure)<\/li>\n<\/ul>\n<h3>Standards and Codes<\/h3>\n<ul>\n<li>ASME B16.5: Pipe flanges and flanged fittings (NPS 1\/2 to 24)<\/li>\n<li>ASME B16.47: Large diameter flanges (NPS 26 to 60)<\/li>\n<li>EN 1092-1: European steel flanges<\/li>\n<li>ASME B31.1: Power piping code<\/li>\n<li>ASME B31.3: Process piping code<\/li>\n<\/ul>\n<h3>Pressure Testing Requirements<\/h3>\n<p>Flanges are typically hydrostatically tested at 1.5 times their rated pressure to verify integrity before being put into service.<\/p>\n<p>Proper flange pressure rating selection ensures safe, reliable, and code-compliant piping system operation throughout its design life.<\/p>\n<p><strong>WhatsApp:<\/strong>\u00a0+86-18658777855<br \/>\n<strong>E-mail:<\/strong>\u00a01007788887@qq.com<br \/>\n<a href=\"https:\/\/www.720yun.com\/vr\/a6ajt7ynrw0\"><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\" 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>Understanding Flange Pressure Ratings Flange pressure rating indicates the maximum pressure a flange can safely withstand at a specific temperature. Selecting the correct rating is critical for system safety and compliance. ASME Pressure Classes Class Max Pressure (bar) Max Pressure (psi) Typical Applications Class 150 19.6 285 Low pressure water, air, general service Class 300 [&hellip;]<\/p>","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":[81,66,89,72,70],"class_list":["post-1016","post","type-post","status-publish","format-standard","hentry","category-blog","tag-ansi","tag-flange","tag-pn16","tag-rating","tag-standard"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/posts\/1016","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/comments?post=1016"}],"version-history":[{"count":2,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/posts\/1016\/revisions"}],"predecessor-version":[{"id":1018,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/posts\/1016\/revisions\/1018"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/media?parent=1016"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/categories?post=1016"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/it\/wp-json\/wp\/v2\/tags?post=1016"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}