{"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\/ar\/2026\/04\/17\/flange-pressure-rating-class-150-to-2500-pn-selection-guide\/","title":{"rendered":"\u062f\u0644\u064a\u0644 \u0627\u062e\u062a\u064a\u0627\u0631 \u062a\u0635\u0646\u064a\u0641 \u0636\u063a\u0637 \u0627\u0644\u0634\u0641\u0629 \u0645\u0646 \u0627\u0644\u0641\u0626\u0629 150 \u0625\u0644\u0649 2500 PN"},"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>\u0627\u0644\u0641\u0626\u0629<\/th>\n<th>Max Pressure (bar)<\/th>\n<th>Max Pressure (psi)<\/th>\n<th>Typical Applications<\/th>\n<\/tr>\n<tr>\n<td>\u0627\u0644\u0641\u0626\u0629 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>\u0627\u0644\u0641\u0626\u0629 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>\u0627\u0644\u0641\u0626\u0629 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>\u0627\u0644\u0641\u0626\u0629 150<\/td>\n<\/tr>\n<tr>\n<td>PN25<\/td>\n<td>25<\/td>\n<td>\u0627\u0644\u0641\u0626\u0629 150<\/td>\n<\/tr>\n<tr>\n<td>PN40<\/td>\n<td>40<\/td>\n<td>\u0627\u0644\u0641\u0626\u0629 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>\u0627\u0644\u0641\u0626\u0629 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> \u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644 \u0627\u0644\u0642\u0635\u0648\u0649<\/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>Common Mistakes to Avoid<\/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>\u0648\u0627\u062a\u0633\u0627\u0628:<\/strong>\u00a0+86-18658777855<br \/>\n<strong>\u0627\u0644\u0628\u0631\u064a\u062f \u0627\u0644\u0625\u0644\u0643\u062a\u0631\u0648\u0646\u064a:<\/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>\u0641\u0647\u0645 \u062a\u0635\u0646\u064a\u0641\u0627\u062a \u0636\u063a\u0637 \u0627\u0644\u0634\u0641\u0629 \u064a\u0634\u064a\u0631 \u062a\u0635\u0646\u064a\u0641 \u0636\u063a\u0637 \u0627\u0644\u0634\u0641\u0629 \u0625\u0644\u0649 \u0623\u0642\u0635\u0649 \u0636\u063a\u0637 \u064a\u0645\u0643\u0646 \u0623\u0646 \u062a\u062a\u062d\u0645\u0644\u0647 \u0627\u0644\u0634\u0641\u0629 \u0628\u0623\u0645\u0627\u0646 \u0639\u0646\u062f \u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0645\u0639\u064a\u0646\u0629. \u064a\u0639\u062f \u0627\u062e\u062a\u064a\u0627\u0631 \u0627\u0644\u062a\u0635\u0646\u064a\u0641 \u0627\u0644\u0635\u062d\u064a\u062d \u0623\u0645\u0631\u064b\u0627 \u0628\u0627\u0644\u063a \u0627\u0644\u0623\u0647\u0645\u064a\u0629 \u0644\u0633\u0644\u0627\u0645\u0629 \u0627\u0644\u0646\u0638\u0627\u0645 \u0648\u0627\u0644\u0627\u0645\u062a\u062b\u0627\u0644. \u0641\u0626\u0627\u062a \u0627\u0644\u0636\u063a\u0637 ASME \u0641\u0626\u0627\u062a \u0627\u0644\u0636\u063a\u0637 \u0627\u0644\u0642\u0635\u0648\u0649 (\u0628\u0627\u0631) \u0623\u0642\u0635\u0649 \u0636\u063a\u0637 (\u0628\u0627\u0631) \u0623\u0642\u0635\u0649 \u0636\u063a\u0637 (\u0631\u0637\u0644 \u0644\u0643\u0644 \u0628\u0648\u0635\u0629 \u0645\u0631\u0628\u0639\u0629) \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a \u0627\u0644\u0646\u0645\u0648\u0630\u062c\u064a\u0629 \u0627\u0644\u0641\u0626\u0629 150 19.6 285 \u0627\u0644\u0645\u0627\u0621 \u0645\u0646\u062e\u0641\u0636 \u0627\u0644\u0636\u063a\u0637\u060c \u0627\u0644\u0647\u0648\u0627\u0621\u060c \u0627\u0644\u062e\u062f\u0645\u0629 \u0627\u0644\u0639\u0627\u0645\u0629 \u0627\u0644\u0641\u0626\u0629 300 [...]<\/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\/ar\/wp-json\/wp\/v2\/posts\/1016","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflange.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflange.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/ar\/wp-json\/wp\/v2\/comments?post=1016"}],"version-history":[{"count":2,"href":"https:\/\/www.songhaiflange.com\/ar\/wp-json\/wp\/v2\/posts\/1016\/revisions"}],"predecessor-version":[{"id":1018,"href":"https:\/\/www.songhaiflange.com\/ar\/wp-json\/wp\/v2\/posts\/1016\/revisions\/1018"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflange.com\/ar\/wp-json\/wp\/v2\/media?parent=1016"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/ar\/wp-json\/wp\/v2\/categories?post=1016"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/ar\/wp-json\/wp\/v2\/tags?post=1016"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}