{"id":49226,"date":"2026-02-26T10:35:30","date_gmt":"2026-02-26T10:35:30","guid":{"rendered":"https:\/\/www.kdmsteel.com\/?p=49226"},"modified":"2026-03-07T10:30:30","modified_gmt":"2026-03-07T10:30:30","slug":"api-650-vs-api-620","status":"publish","type":"post","link":"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/","title":{"rendered":"API 650\u3068API 620 \u2013 \u8caf\u8535\u30bf\u30f3\u30af\u306b\u306f\u3069\u3061\u3089\u3092\u9078\u3076\u3079\u304d\u304b\uff1f"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">API 650\u3068API 620\u306e\u3069\u3061\u3089\u3092\u9078\u3076\u3079\u304d\u304b\u3068\u3044\u3046\u7591\u554f\u306f\u3001\u77f3\u6cb9\u3001\u30ac\u30b9\u3001\u307e\u305f\u306f\u5316\u5b66\u85ac\u54c1\u7528\u306e\u6eb6\u63a5\u92fc\u88fd\u8caf\u8535\u30bf\u30f3\u30af\u3092\u9078\u3076\u969b\u306b\u3088\u304f\u51fa\u3066\u304f\u308b\u3002\u3069\u3061\u3089\u306e\u898f\u683c\u3082<\/span><a href=\"https:\/\/www.api.org\/\"> <b>\u30a2\u30e1\u30ea\u30ab\u77f3\u6cb9\u5354\u4f1a<\/b><\/a><span style=\"font-weight: 400;\"> \u30bf\u30f3\u30af\u306e\u4f5c\u308a\u65b9\u3092\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u6e29\u5ea6\u3068\u5727\u529b\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002\u9069\u5207\u306a\u9078\u629e\u3092\u3059\u308b\u3053\u3068\u3067\u3001\u4e88\u7b97\u3001\u5b89\u5168\u6027\u3001\u305d\u3057\u3066\u696d\u52d9\u30d7\u30ed\u30bb\u30b9\u3092\u9577\u671f\u306b\u308f\u305f\u3063\u3066\u4fdd\u8b77\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/span><\/p>\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\">\u76ee\u6b21<\/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=\"\u76ee\u6b21\u3092\u5207\u308a\u66ff\u3048\u308b\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u30c8\u30b0\u30eb<\/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-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#What_Is_API_650_Standard\" >API 650\u898f\u683c\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#What_Is_API_620_Standard\" >API 620\u898f\u683c\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/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.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Side-by-Side_Comparison_API_650_vs_API_620\" >API 650\u3068API 620\u306e\u6bd4\u8f03<\/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.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Applicable_Pressure_Range\" >\u9069\u7528\u5727\u529b\u7bc4\u56f2<\/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.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_650\" >API 650<\/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.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_620\" >API 620<\/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.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Temperature_Range\" >\u6e29\u5ea6\u7bc4\u56f2<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_650-2\" >API 650<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_620-2\" >API 620<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Scope_and_Purpose_of_Standards\" >\u898f\u683c\u306e\u7bc4\u56f2\u3068\u76ee\u7684<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_650-3\" >API 650<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_620-3\" >API 620<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Tank_Configuration_Geometry\" >\u30bf\u30f3\u30af\u306e\u69cb\u6210\u3068\u5f62\u72b6<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_650-4\" >API 650<\/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.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_620-4\" >API 620:<\/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.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Typical_Tank_Sizes\" >\u4e00\u822c\u7684\u306a\u30bf\u30f3\u30af\u30b5\u30a4\u30ba<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_650-5\" >API 650<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Fabrication_Erection\" >\u88fd\u4f5c\u30fb\u636e\u4ed8<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_650-6\" >API 650<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_620-5\" >API 620<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Materials_Allowed\" >\u4f7f\u7528\u53ef\u80fd\u306a\u6750\u6599<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_650-7\" >API 650<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_620-6\" >API 620<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Inspection_and_Testing_Standards\" >\u691c\u67fb\u304a\u3088\u3073\u8a66\u9a13\u57fa\u6e96<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_650-8\" >API 650<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_620-7\" >API 620<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Roof_Closure_Types\" >\u5c4b\u6839\u3068\u9589\u9396\u90e8\u306e\u7a2e\u985e<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_650-9\" >API 650<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_620-8\" >API 620<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Application_Industry_Use\" >\u7528\u9014\u3068\u7523\u696d\u5229\u7528<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_650-10\" >API 650<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_620-9\" >API 620<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_650_vs_API_620_%E2%80%93_Quick_Comparison_Table\" >API 650\u3068API 620\u306e\u6bd4\u8f03\u8868<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_650_vs_API_620_%E2%80%93_Which_One_Is_Best\" >API 650\u3068API 620 \u2013 \u3069\u3061\u3089\u304c\u6700\u9069\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#FAQs\" >\u3088\u304f\u3042\u308b\u8cea\u554f<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Can_API_620_tanks_work_when_the_pressure_outside_is_normal\" >API 620\u898f\u683c\u306e\u30bf\u30f3\u30af\u306f\u3001\u5916\u90e8\u5727\u529b\u304c\u6b63\u5e38\u306a\u5834\u5408\u3067\u3082\u4f7f\u7528\u3067\u304d\u307e\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#API_620_or_API_650_Which_costs_less\" >API 620\u3068API 650\u3001\u3069\u3061\u3089\u304c\u5b89\u3044\u3067\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Is_it_possible_to_change_an_API_650_tank_to_an_API_620_tank\" >API 650\u898f\u683c\u306e\u30bf\u30f3\u30af\u3092API 620\u898f\u683c\u306e\u30bf\u30f3\u30af\u306b\u5909\u66f4\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#How_are_inspections_done_for_API_620_and_API_650_the_same\" >API 620\u3068API 650\u306e\u691c\u67fb\u65b9\u6cd5\u306f\u3069\u306e\u3088\u3046\u306b\u540c\u3058\u3067\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Can_API_620_and_API_650_be_used_together\" >API 620\u3068API 650\u306f\u4f75\u7528\u3067\u304d\u307e\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Do_radiography_tests_have_to_be_done_for_API_620\" >API 620\u3067\u306f\u653e\u5c04\u7dda\u900f\u904e\u8a66\u9a13\u3092\u5b9f\u65bd\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-42\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Does_temperature_play_a_role_in_choosing_between_API_620_and_650\" >API 620\u3068650\u306e\u3069\u3061\u3089\u3092\u9078\u3076\u304b\u306b\u304a\u3044\u3066\u3001\u6e29\u5ea6\u306f\u91cd\u8981\u306a\u8981\u7d20\u306b\u306a\u308a\u307e\u3059\u304b\uff1f<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-43\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/#Get_Customized_Storage_Tanks_from_KDM_Steel\" >KDM Steel\u3067\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3055\u308c\u305f\u8caf\u8535\u30bf\u30f3\u30af\u3092\u624b\u306b\u5165\u308c\u3088\u3046<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_API_650_Standard\"><\/span><b>API 650\u898f\u683c\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49228\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-89.png\" alt=\"\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-89.png 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-89-150x84.png 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-89-768x432.png 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-89-18x10.png 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">API 650\u306f\u3001\u5927\u6c17\u5727\u306b\u8fd1\u3044\u5727\u529b\u3067\u4f7f\u7528\u3055\u308c\u308b\u6eb6\u63a5\u5f0f\u8caf\u8535\u30bf\u30f3\u30af\u306e\u8a2d\u8a08\u304a\u3088\u3073\u5efa\u8a2d\u65b9\u6cd5\u306b\u95a2\u3059\u308b\u898f\u683c\u3067\u3059\u3002\u4e3b\u306b\u5730\u4e0a\u306b\u8a2d\u7f6e\u3055\u308c\u3001\u539f\u6cb9\u3001\u6c34\u3001\u5b8c\u6210\u54c1\u3092\u8caf\u8535\u3059\u308b\u30bf\u30f3\u30af\u3092\u5bfe\u8c61\u3068\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u898f\u683c\u306e\u4e3b\u306a\u5185\u5bb9\u306f\u3001\u9069\u5207\u306a\u6750\u6599\u306e\u9078\u5b9a\u3001\u5185\u90e8\u5727\u529b\u304c\u4f4e\u3044\u72b6\u614b\u3067\u3082\u88fd\u54c1\u3092\u5b89\u5168\u306b\u4fdd\u7ba1\u3067\u304d\u308b\u3053\u3068\u306e\u78ba\u8a8d\u3001\u30bf\u30f3\u30af\u306e\u691c\u67fb\u304a\u3088\u3073\u8a66\u9a13\u3067\u3059\u3002.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_API_620_Standard\"><\/span><b>API 620\u898f\u683c\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49229\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-90.png\" alt=\"\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-90.png 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-90-150x84.png 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-90-768x432.png 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-90-18x10.png 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">API 620 \u3067\u306f\u3001\u5927\u898f\u6a21\u306a\u8a08\u753b\u3068\u69cb\u7bc9\u306e\u65b9\u6cd5\u304c\u8aac\u660e\u3055\u308c\u3066\u3044\u307e\u3059\u3002,<\/span><a href=\"https:\/\/www.kdmsteel.com\/ja\/\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc\u88fd\u30bf\u30f3\u30af\u306e\u6eb6\u63a5\/\"> <b>\u6eb6\u63a5\u3055\u308c\u305f\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc\u88fd\u30bf\u30f3\u30af<\/b><\/a><span style=\"font-weight: 400;\"> \u5185\u90e8\u306e\u5727\u529b\u304c\u4f4e\uff5e\u4e2d\u7a0b\u5ea6\u306e\u5834\u5408\u306b\u6a5f\u80fd\u3057\u307e\u3059\u3002\u51b7\u8535\u307e\u305f\u306f\u51b7\u51cd\u4fdd\u5b58\u304c\u5fc5\u8981\u306a\u3082\u306e\u3001\u4f8b\u3048\u3070<\/span><b> LPG<\/b><span style=\"font-weight: 400;\"> \u307e\u305f\u3001LNG\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002API 650\u3088\u308a\u3082\u9ad8\u3044\u8a2d\u8a08\u5fdc\u529b\u3084\u904e\u9177\u306a\u6e29\u5ea6\u6761\u4ef6\u306b\u3082\u8010\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Side-by-Side_Comparison_API_650_vs_API_620\"><\/span><b>API 650\u3068API 620\u306e\u6bd4\u8f03<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49230\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-91.png\" alt=\"\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-91.png 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-91-150x84.png 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-91-768x432.png 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-91-18x10.png 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Applicable_Pressure_Range\"><\/span><b>\u9069\u7528\u5727\u529b\u7bc4\u56f2<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"API_650\"><\/span><b>API 650<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 650\u306f\u3001\u5927\u6c17\u5727\u307e\u305f\u306f\u975e\u5e38\u306b\u4f4e\u3044\u5727\u529b\u3067\u306e\u4fdd\u7ba1\u7528\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u901a\u5e38\u306e\u7a7a\u6c17\u5727\u304b\u3089\u7d042.5 psig\u307e\u3067\u306e\u5727\u529b\u7bc4\u56f2\u3067\u4f7f\u7528\u3055\u308c\u308b\u30bf\u30f3\u30af\u5411\u3051\u306b\u4f5c\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u591a\u304f\u306e\u88fd\u6cb9\u6240\u3084\u30d0\u30eb\u30af\u8caf\u8535\u65bd\u8a2d\u3067\u306f\u3001\u5185\u90e8\u306b\u904e\u5ea6\u306e\u5727\u529b\u304c\u304b\u304b\u3089\u306a\u3044\u3088\u3046\u306b\u6db2\u4f53\u3092\u8caf\u8535\u3059\u308b\u305f\u3081\u306b\u3001\u3053\u308c\u3089\u306e\u30bf\u30f3\u30af\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002API 650\u306f\u3001\u6c34\u3001\u30c7\u30a3\u30fc\u30bc\u30eb\u6cb9\u3001\u539f\u6cb9\u3001\u305d\u306e\u4ed6\u540c\u69d8\u306e\u88fd\u54c1\u306b\u3068\u3063\u3066\u3001\u8cbb\u7528\u5bfe\u52b9\u679c\u304c\u9ad8\u304f\u3001\u696d\u754c\u3067\u5e83\u304f\u8a8d\u3081\u3089\u308c\u3066\u3044\u308b\u9078\u629e\u80a2\u3067\u3059\u3002\u5727\u529b\u8a2d\u8a08\u30d7\u30ed\u30bb\u30b9\u306b\u4f59\u5206\u306a\u8907\u96d1\u3055\u3092\u52a0\u3048\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u305b\u3093\u3002.<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"API_620\"><\/span><b>API 620<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 620\u306f\u3001\u8a2d\u8a08\u4e0a\u306e\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u3001\u901a\u5e382.5 psig\u4ee5\u4e0a15 psig\u4ee5\u4e0a\u306e\u4f4e\uff5e\u4e2d\u7a0b\u5ea6\u306e\u5185\u5727\u306e\u30bf\u30f3\u30af\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u4e00\u822c\u7684\u306b\u3001LPG\u306a\u3069\u306e\u63ee\u767a\u6027\u71c3\u6599\u3084\u52a0\u5727\u71c3\u6599\u306b\u63a1\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u898f\u683c\u3067\u306f\u3001\u3088\u308a\u9ad8\u3044\u819c\u5fdc\u529b\u3001\u3088\u308a\u5f37\u56fa\u306a\u30b7\u30a7\u30eb\u30d7\u30ec\u30fc\u30c8\u3001\u304a\u3088\u3073\u512a\u308c\u305f\u69cb\u9020\u5f37\u5ea6\u304c\u8a8d\u3081\u3089\u308c\u3066\u304a\u308a\u3001\u5185\u5727\u304c\u9ad8\u3044\u5834\u5408\u3067\u3082\u30b7\u30b9\u30c6\u30e0\u304c\u5b89\u5168\u306b\u52d5\u4f5c\u3059\u308b\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u307e\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Temperature_Range\"><\/span><b>\u6e29\u5ea6\u7bc4\u56f2<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"API_650-2\"><\/span><b>API 650<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 650\u898f\u683c\u306e\u30bf\u30f3\u30af\u306f\u3001\u901a\u5e38\u3001\u305d\u306e\u5730\u57df\u306e\u4e00\u822c\u7684\u306a\u6e29\u5ea6\u3067\u306e\u4f7f\u7528\u3092\u60f3\u5b9a\u3057\u3066\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u591a\u5c11\u9ad8\u3044\u6e29\u5ea6\u306b\u3082\u8010\u3048\u3089\u308c\u307e\u3059\u304c\u3001\u6975\u4f4e\u6e29\u3084\u975e\u5e38\u306b\u4f4e\u3044\u6e29\u5ea6\u3092\u5fc5\u8981\u3068\u3059\u308b\u7528\u9014\u306b\u306f\u9069\u3057\u3066\u3044\u307e\u305b\u3093\u3002\u6e29\u5ea6\u304c\u5927\u5e45\u306b\u4f4e\u4e0b\u3059\u308b\u3068\u3001\u6750\u6599\u306e\u976d\u6027\u3068\u8010\u7834\u58ca\u6027\u304c\u975e\u5e38\u306b\u91cd\u8981\u306b\u306a\u308a\u307e\u3059\u3002API 650\u898f\u683c\u306f\u3001\u305d\u306e\u9650\u754c\u304b\u3089\u3001\u6975\u5bd2\u306e\u5834\u6240\u306b\u306f\u3042\u307e\u308a\u9069\u3057\u3066\u3044\u307e\u305b\u3093\u3002.<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"API_620-2\"><\/span><b>API 620<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 620 \u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u4f4e\u6e29\u307e\u305f\u306f\u51b7\u51cd\u72b6\u614b\u3067\u7269\u3092\u4fdd\u7ba1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u7528\u9014\u306b\u5bfe\u5fdc\u3059\u308b\u305f\u3081\u306b\u4f5c\u3089\u308c\u3066\u3044\u307e\u3059\u3002 <\/span><b>LNG<\/b><span style=\"font-weight: 400;\"> \u305d\u306e\u4ed6\u6db2\u5316\u30ac\u30b9\u306b\u3082\u9069\u7528\u3055\u308c\u307e\u3059\u3002\u4f4e\u6e29\u976d\u6027\u3001\u885d\u6483\u8a66\u9a13\u3001\u7279\u5b9a\u306e\u6750\u6599\u306e\u4f7f\u7528\u306b\u3064\u3044\u3066\u306f\u53b3\u683c\u306a\u898f\u5b9a\u304c\u3042\u308a\u307e\u3059\u3002API 620\u306f\u3001\u6c37\u70b9\u4e0b\u306e\u6e29\u5ea6\u3067\u7a3c\u50cd\u3059\u308b\u65bd\u8a2d\u306b\u304a\u3044\u3066\u3001\u69cb\u9020\u7269\u306e\u7834\u640d\u3084\u8106\u5316\u3092\u9632\u3050\u305f\u3081\u306e\u91cd\u8981\u306a\u51b6\u91d1\u5b66\u7684\u4fdd\u8b77\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Scope_and_Purpose_of_Standards\"><\/span><b>\u898f\u683c\u306e\u7bc4\u56f2\u3068\u76ee\u7684<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"API_650-3\"><\/span><b>API 650<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 650\u306f\u3001\u5730\u4e0a\u306b\u8a2d\u7f6e\u3055\u308c\u308b\u5927\u578b\u5927\u6c17\u5727\u8caf\u8535\u30bf\u30f3\u30af\u306e\u8a08\u753b\u3001\u5efa\u8a2d\u3001\u691c\u67fb\u3001\u8a66\u9a13\u306b\u95a2\u3059\u308b\u898f\u683c\u3067\u3059\u3002\u4e16\u754c\u4e2d\u306e\u77f3\u6cb9\u3084\u6db2\u4f53\u3092\u8caf\u8535\u3059\u308b\u305f\u3081\u306e\u5efa\u8a2d\u6280\u8853\u306e\u57fa\u6e96\u3092\u5b9a\u3081\u3066\u3044\u307e\u3059\u3002API 650\u306f\u4e16\u754c\u4e2d\u3067\u8a8d\u3081\u3089\u308c\u3066\u304a\u308a\u3001\u57fa\u6e96\u304c\u7c21\u6f54\u3067\u3042\u308b\u305f\u3081\u3001\u88fd\u6cb9\u6240\u3001\u30bf\u30fc\u30df\u30ca\u30eb\u3001\u7523\u696d\u7528\u8caf\u8535\u65bd\u8a2d\u3067\u5e83\u304f\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002.<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"API_620-3\"><\/span><b>API 620<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 620\u306f\u3001\u7a7a\u6c17\u30bf\u30f3\u30af\u306b\u52a0\u3048\u3001\u9ad8\u5727\u30fb\u4f4e\u6e29\u74b0\u5883\u4e0b\u3067\u4f7f\u7528\u3055\u308c\u308b\u5bb9\u5668\u3082\u5bfe\u8c61\u3068\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u5fdc\u529b\u89e3\u6790\u306e\u305f\u3081\u306e\u3088\u308a\u9ad8\u5ea6\u306a\u624b\u6cd5\u3001\u63a5\u5408\u90e8\u306e\u52b9\u7387\u6027\u306b\u95a2\u3059\u308b\u3088\u308a\u53b3\u683c\u306a\u898f\u5b9a\u3001\u305d\u3057\u3066\u3088\u308a\u512a\u308c\u305f\u54c1\u8cea\u7ba1\u7406\u3082\u76db\u308a\u8fbc\u307e\u308c\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001API 620\u306f\u3001\u3088\u308a\u904e\u9177\u306a\u6761\u4ef6\u4e0b\u3067\u7a3c\u50cd\u3059\u308b\u77f3\u6cb9\u30d7\u30e9\u30f3\u30c8\u3084\u30ac\u30b9\u51e6\u7406\u30d7\u30e9\u30f3\u30c8\u3067\u3082\u4f7f\u7528\u53ef\u80fd\u3067\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tank_Configuration_Geometry\"><\/span><b>\u30bf\u30f3\u30af\u306e\u69cb\u6210\u3068\u5f62\u72b6<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"API_650-4\"><\/span><b>API 650<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 650\u898f\u683c\u306e\u30bf\u30f3\u30af\u306e\u307b\u3068\u3093\u3069\u306f\u3001\u76f4\u7dda\u72b6\u306e\u5186\u7b52\u5f62\u3067\u5e95\u9762\u304c\u5e73\u3089\u306a\u305f\u3081\u3001\u73fe\u5834\u3067\u306e\u8a2d\u7f6e\u304c\u5bb9\u6613\u3067\u3059\u3002\u88fd\u54c1\u306e\u4e0d\u5b89\u5b9a\u6027\u306b\u5fdc\u3058\u3066\u3001\u5c4b\u6839\u306e\u8a2d\u8a08\u306f\u56fa\u5b9a\u5c4b\u6839\u3001\u6d6e\u304d\u5c4b\u6839\u3001\u307e\u305f\u306f\u958b\u653e\u578b\u3068\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u5f62\u72b6\u306f\u30b7\u30f3\u30d7\u30eb\u3055\u3092\u91cd\u8996\u3057\u3001\u8a2d\u8a08\u306e\u6a5f\u80fd\u6027\u3092\u9ad8\u3081\u3001\u5927\u6c17\u4e2d\u306b\u5927\u91cf\u306e\u7a7a\u6c17\u3092\u8caf\u8535\u3059\u308b\u969b\u306e\u30b3\u30b9\u30c8\u3092\u4f4e\u304f\u6291\u3048\u308b\u3088\u3046\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002.<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"API_620-4\"><\/span><b>API 620:<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 620\u898f\u683c\u306b\u6e96\u62e0\u3057\u3066\u88fd\u9020\u3055\u308c\u305f\u30bf\u30f3\u30af\u306f\u3001\u901a\u5e38\u3001\u30bf\u30f3\u30af\u5185\u90e8\u306e\u5727\u529b\u306b\u8010\u3048\u3089\u308c\u308b\u3088\u3046\u3001\u30c9\u30fc\u30e0\u578b\u306e\u5c4b\u6839\u307e\u305f\u306f\u8010\u5727\u6027\u306e\u4e0a\u9762\u3092\u5099\u3048\u3066\u3044\u307e\u3059\u3002\u591a\u304f\u306e\u5834\u5408\u3001\u5916\u677f\u306f\u3088\u308a\u5927\u304d\u304f\u9811\u4e08\u306a\u305f\u3081\u3001\u3088\u308a\u9ad8\u3044\u5fdc\u529b\u306b\u8010\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6975\u4f4e\u6e29\u30bf\u30f3\u30af\u3092\u4f4e\u6e29\u3067\u52d5\u4f5c\u3055\u305b\u308b\u305f\u3081\u306b\u306f\u3001\u65ad\u71b1\u30b7\u30b9\u30c6\u30e0\u3084\u7279\u6b8a\u306a\u5c64\u304c\u30bf\u30f3\u30af\u81ea\u4f53\u306e\u5f62\u72b6\u306b\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u307e\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Typical_Tank_Sizes\"><\/span><b>\u4e00\u822c\u7684\u306a\u30bf\u30f3\u30af\u30b5\u30a4\u30ba<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"API_650-5\"><\/span><b>API 650<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 650\u898f\u683c\u306e\u30bf\u30f3\u30af\u306f\u3001\u5c0f\u578b\u306e\u30d7\u30ed\u30bb\u30b9\u7528\u30bf\u30f3\u30af\u304b\u308910\u4e07\u30d0\u30ec\u30eb\u4ee5\u4e0a\u3092\u8caf\u8535\u3067\u304d\u308b\u5927\u578b\u539f\u6cb9\u8caf\u8535\u30bf\u30f3\u30af\u307e\u3067\u3001\u3055\u307e\u3056\u307e\u306a\u91cf\u306e\u77f3\u6cb9\u3092\u8caf\u8535\u3067\u304d\u307e\u3059\u3002\u30b5\u30a4\u30ba\u3092\u81ea\u7531\u306b\u8abf\u6574\u3067\u304d\u308b\u305f\u3081\u3001\u5727\u529b\u95a2\u9023\u306e\u8a2d\u8a08\u30b3\u30b9\u30c8\u3092\u8ffd\u52a0\u3067\u652f\u6255\u3046\u3053\u3068\u306a\u304f\u5927\u91cf\u306e\u7a7a\u6c17\u3092\u8caf\u8535\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u88fd\u6cb9\u6240\u3084\u30d0\u30eb\u30af\u8caf\u8535\u30bb\u30f3\u30bf\u30fc\u306b\u6700\u9069\u3067\u3059\u3002.<\/span><\/p>\n<p><b>API 620<\/b><\/p>\n<p><span style=\"font-weight: 400;\">\u3053\u308c\u3089\u306e\u30bf\u30f3\u30af\u306f\u975e\u5e38\u306b\u5927\u578b\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u5185\u90e8\u5727\u529b\u3084\u4f4e\u6e29\u74b0\u5883\u4e0b\u3067\u306e\u4f7f\u7528\u306b\u52a0\u3048\u3001\u5927\u5bb9\u91cf\u306e\u8caf\u8535\u30b9\u30da\u30fc\u30b9\u304c\u5fc5\u8981\u306a\u5834\u5408\u306b\u9078\u3070\u308c\u307e\u3059\u3002\u3053\u3046\u3057\u305f\u7406\u7531\u304b\u3089\u3001\u5927\u578b\u304b\u3064\u5805\u7262\u306aLNG\u304a\u3088\u3073LPG\u30bf\u30f3\u30af\u306e\u88fd\u9020\u306b\u306f\u3001API 620\u304c\u6700\u9069\u306a\u898f\u683c\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Fabrication_Erection\"><\/span><b>\u88fd\u4f5c\u30fb\u636e\u4ed8<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"API_650-6\"><\/span><b>API 650<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 650\u898f\u683c\u306b\u57fa\u3065\u304f\u30bf\u30f3\u30af\u88fd\u9020\u306f\u3001\u901a\u5e38\u3001\u6eb6\u63a5\u3055\u308c\u305f\u92fc\u677f\u3092\u7528\u3044\u3066\u73fe\u5834\u3067\u884c\u308f\u308c\u307e\u3059\u3002\u30bf\u30f3\u30af\u306e\u7d44\u307f\u7acb\u3066\u5de5\u7a0b\u306f\u3088\u304f\u77e5\u3089\u308c\u3066\u304a\u308a\u3001\u307b\u3068\u3093\u3069\u306e\u30bf\u30f3\u30af\u88fd\u9020\u696d\u8005\u304c\u63a1\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u6a19\u6e96\u5316\u3055\u308c\u305f\u691c\u67fb\u304a\u3088\u3073\u8a66\u9a13\u65b9\u6cd5\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u88fd\u9020\u5de5\u7a0b\u306e\u8fc5\u901f\u5316\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u306e\u7ba1\u7406\u3001\u305d\u3057\u3066\u88fd\u9020\u30b3\u30b9\u30c8\u306e\u524a\u6e1b\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002.<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"API_620-5\"><\/span><b>API 620<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 620\u898f\u683c\u306b\u6e96\u62e0\u3057\u305f\u88fd\u9020\u306b\u304a\u3044\u3066\u306f\u3001\u3088\u308a\u9ad8\u3044\u5727\u529b\u3068\u5fdc\u529b\u304c\u304b\u304b\u308b\u305f\u3081\u3001\u3088\u308a\u53b3\u683c\u306a\u6eb6\u63a5\u65b9\u6cd5\u3001\u3088\u308a\u9ad8\u5ea6\u306a\u54c1\u8cea\u7ba1\u7406\u3001\u305d\u3057\u3066\u3088\u308a\u5fb9\u5e95\u3057\u305f\u691c\u67fb\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002\u591a\u304f\u306e\u5834\u5408\u3001\u636e\u4ed8\u4f5c\u696d\u306b\u306f\u3088\u308a\u9ad8\u5ea6\u306a\u6280\u8853\u7ba1\u7406\u3068\u3088\u308a\u9ad8\u5ea6\u306a\u8a66\u9a13\u65b9\u6cd5\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u4f5c\u696d\u3092\u8907\u96d1\u306b\u3057\u307e\u3059\u304c\u3001\u9577\u671f\u7684\u306b\u306f\u3088\u308a\u5b89\u5168\u3067\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u3082\u306e\u3068\u306a\u308a\u307e\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Materials_Allowed\"><\/span><b>\u4f7f\u7528\u53ef\u80fd\u306a\u6750\u6599<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"API_650-7\"><\/span><b>API 650<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 650\u898f\u683c\u3067\u306f\u3001\u4e3b\u306b\u5ba4\u6e29\u30fb\u5e38\u5727\u4e0b\u3067\u4f7f\u7528\u53ef\u80fd\u306a\u70ad\u7d20\u92fc\u88fd\u54c1\u304c\u8a8d\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u6750\u6599\u306e\u9078\u629e\u306f\u3001\u6eb6\u63a5\u6027\u306e\u826f\u3055\u3068\u65e5\u5e38\u4f7f\u7528\u306b\u5fc5\u8981\u306a\u5f37\u5ea6\u306b\u57fa\u3065\u3044\u3066\u884c\u308f\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u4f4e\u6e29\u74b0\u5883\u3084\u7279\u6b8a\u306a\u4f7f\u7528\u6761\u4ef6\u304c\u6c42\u3081\u3089\u308c\u308b\u5834\u5408\u306b\u306f\u3001\u9078\u629e\u80a2\u306f\u9650\u3089\u308c\u307e\u3059\u3002.<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"API_620-6\"><\/span><b>API 620<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 620\u898f\u683c\u3067\u306f\u3001\u4f4e\u6e29\u4e0b\u3067\u3088\u308a\u5f37\u976d\u306a\u92fc\u6750\u306a\u3069\u3001\u3088\u308a\u5e45\u5e83\u3044\u88fd\u54c1\u306e\u4f7f\u7528\u304c\u53ef\u80fd\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u5e45\u5e83\u3044\u6750\u6599\u306e\u4f7f\u7528\u306f\u3001\u4f4e\u6e29\u307e\u305f\u306f\u51b7\u51cd\u72b6\u614b\u3092\u7dad\u6301\u3059\u308b\u5fc5\u8981\u306e\u3042\u308b\u7528\u9014\u306b\u304a\u3044\u3066\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002\u3053\u306e\u898f\u683c\u306f\u3001\u9ad8\u6e29\u4e0b\u3067\u3082\u6750\u6599\u304c\u5f37\u5ea6\u3001\u67d4\u8edf\u6027\u3001\u305d\u3057\u3066\u7834\u640d\u3057\u306b\u304f\u3055\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Inspection_and_Testing_Standards\"><\/span><b>\u691c\u67fb\u304a\u3088\u3073\u8a66\u9a13\u57fa\u6e96<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"API_650-8\"><\/span><b>API 650<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 650\u306f\u3001\u5408\u540c\u5206\u985e\u306b\u57fa\u3065\u304d\u3001\u9069\u5207\u306a\u691c\u67fb\u3001\u6c34\u5727\u8a66\u9a13\u3001\u304a\u3088\u3073\u9650\u5b9a\u7684\u306a\u653e\u5c04\u7dda\u900f\u904e\u8a66\u9a13\u3092\u8981\u6c42\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u691c\u67fb\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u6709\u7528\u3067\u8cbb\u7528\u3082\u305d\u308c\u307b\u3069\u304b\u304b\u3089\u306a\u3044\u305f\u3081\u3001\u5927\u6c17\u5727\u30bf\u30f3\u30af\u306b\u3082\u9069\u7528\u3067\u304d\u3001\u77f3\u6cb9\u696d\u754c\u306e\u5b89\u5168\u898f\u5247\u3092\u9075\u5b88\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"API_620-7\"><\/span><b>API 620<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 620\u3067\u306f\u3001\u3088\u308a\u53b3\u683c\u306a\u975e\u7834\u58ca\u691c\u67fb\u57fa\u6e96\u3068\u3001\u7279\u306b\u5727\u529b\u4fdd\u6301\u90e8\u306b\u304a\u3051\u308b\u3088\u308a\u5e83\u7bc4\u306a\u653e\u5c04\u7dda\u900f\u904e\u691c\u67fb\u304c\u6c42\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u3088\u308a\u512a\u308c\u305f\u691c\u67fb\u65b9\u6cd5\u306b\u3088\u308a\u3001\u6eb6\u63a5\u90e8\u306e\u5f37\u5ea6\u3068\u3001\u5727\u529b\u304a\u3088\u3073\u4f4e\u6e29\u4e0b\u3067\u306e\u69cb\u9020\u7269\u306e\u6319\u52d5\u306b\u5bfe\u3059\u308b\u4fe1\u983c\u6027\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Roof_Closure_Types\"><\/span><b>\u5c4b\u6839\u3068\u9589\u9396\u90e8\u306e\u7a2e\u985e<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"API_650-9\"><\/span><b>API 650<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 650\u306f\u3001\u56fa\u5b9a\u5c4b\u6839\u3001\u53ef\u52d5\u5c4b\u6839\u3001\u30aa\u30fc\u30d7\u30f3\u30c8\u30c3\u30d7\u578b\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u7a2e\u985e\u306e\u5c4b\u6839\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002.<\/span><a href=\"https:\/\/www.kdmsteel.com\/ja\/\u56fa\u5b9a\u5c4b\u6839\u30bf\u30f3\u30af\u3068\u6d6e\u304d\u5c4b\u6839\u30bf\u30f3\u30af\u306e\u6bd4\u8f03\/\"> <b>\u56fa\u5b9a\u5c4b\u6839\u5f0f\u30bf\u30f3\u30af\u3068\u6d6e\u304d\u5c4b\u6839\u5f0f\u30bf\u30f3\u30af<\/b><\/a><span style=\"font-weight: 400;\"> \u63ee\u767a\u6027\u71c3\u6599\u306e\u8caf\u8535\u306b\u304a\u3044\u3066\u3001\u6392\u51fa\u7269\u3084\u84b8\u6c17\u640d\u5931\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u305f\u3081\u306b\u3001\u3053\u308c\u3089\u306e\u5c4b\u6839\u304c\u3088\u304f\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u69d8\u3005\u306a\u5c4b\u6839\u306e\u9078\u629e\u80a2\u306b\u3088\u308a\u3001\u591a\u69d8\u306a\u8caf\u8535\u5f62\u614b\u3084\u74b0\u5883\u30cb\u30fc\u30ba\u306b\u5bfe\u5fdc\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002.<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"API_620-8\"><\/span><b>API 620<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 620\u898f\u683c\u3067\u306f\u901a\u5e38\u3001\u5727\u529b\u306b\u8010\u3048\u3089\u308c\u308b\u30c9\u30fc\u30e0\u578b\u5c4b\u6839\u304c\u4f7f\u7528\u3055\u308c\u3001\u3053\u308c\u306f\u30bf\u30f3\u30af\u306e\u8010\u5727\u9650\u754c\u306e\u4e00\u90e8\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u5c4b\u6839\u30b7\u30b9\u30c6\u30e0\u306f\u3001\u5185\u90e8\u306e\u7a7a\u6c17\u5727\u3092\u5b89\u5168\u306b\u652f\u3048\u308b\u3088\u3046\u306b\u8a2d\u8a08\u3055\u308c\u3066\u3044\u307e\u3059\u3002LPG\u3084\u51b7\u51cd\u30ac\u30b9\u3092\u8caf\u8535\u3059\u308b\u5834\u5408\u3001\u5c01\u3058\u8fbc\u3081\u72b6\u614b\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u5c4b\u6839\u306e\u69cb\u9020\u306f\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Application_Industry_Use\"><\/span><b>\u7528\u9014\u3068\u7523\u696d\u5229\u7528<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"API_650-10\"><\/span><b>API 650<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">API 650\u306f\u3001\u88fd\u6cb9\u6240\u3001\u71c3\u6599\u6e2f\u3001\u6d44\u6c34\u5834\u3001\u5de5\u5834\u306a\u3069\u3001\u591a\u304f\u306e\u5834\u6240\u3067\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u6c34\u3001\u8efd\u6cb9\u3001\u30ac\u30bd\u30ea\u30f3\u3001\u539f\u6cb9\u306a\u3069\u3092\u7a7a\u6c17\u5727\u3067\u8caf\u8535\u3059\u308b\u306e\u306b\u6700\u9069\u306a\u898f\u683c\u3067\u3059\u3002\u4f7f\u3044\u3084\u3059\u304f\u3001\u4e16\u754c\u4e2d\u3067\u5e83\u304f\u53d7\u3051\u5165\u308c\u3089\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u4eca\u3067\u3082\u6700\u3082\u666e\u53ca\u3057\u3066\u3044\u308b\u8caf\u8535\u30bf\u30f3\u30af\u898f\u683c\u3067\u3059\u3002.<\/span><\/p>\n<h4><span class=\"ez-toc-section\" id=\"API_620-9\"><\/span><b>API 620<\/b><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><span style=\"font-weight: 400;\">LNG\u6e2f\u3001LPG\u8caf\u8535\u65bd\u8a2d\u3001\u77f3\u6cb9\u5316\u5b66\u30d7\u30e9\u30f3\u30c8\u3001\u30ac\u30b9\u51e6\u7406\u65bd\u8a2d\u306b\u304a\u3044\u3066\u306f\u3001API 620\u304c\u6700\u9069\u306a\u9078\u629e\u80a2\u3067\u3059\u3002\u52a0\u5727\u4e0b\u3084\u51b7\u8535\u4e0b\u3067\u6db2\u4f53\u3092\u8caf\u8535\u3059\u308b\u5834\u5408\u3001\u3053\u306e\u898f\u683c\u306f\u69cb\u9020\u7269\u304c\u9577\u671f\u9593\u5b89\u5168\u306b\u7a3c\u50cd\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u5f37\u5ea6\u3068\u6750\u6599\u306e\u4fe1\u983c\u6027\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"API_650_vs_API_620_%E2%80%93_Quick_Comparison_Table\"><\/span><b>API 650\u3068API 620\u306e\u6bd4\u8f03\u8868<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<tbody>\n<tr>\n<td><b>\u30d1\u30e9\u30e1\u30fc\u30bf<\/b><\/td>\n<td><b>API 650<\/b><\/td>\n<td><b>API 620<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>\u9069\u7528\u5727\u529b\u7bc4\u56f2<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u5927\u6c17\u5727\uff5e\u7d042.5 psig<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u7d042.5 psig\u4ee5\u4e0a\u3001\u4f4e\uff5e\u4e2d\u7a0b\u5ea6\u306e\u5727\u529b<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>\u6e29\u5ea6\u7bc4\u56f2<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u5468\u56f2\u6e29\u5ea6<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u4f4e\u6e29\u304a\u3088\u3073\u6975\u4f4e\u6e29<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>\u9069\u7528\u7bc4\u56f2\u3068\u76ee\u7684<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u5927\u6c17\u5727\u8caf\u8535\u30bf\u30f3\u30af<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u52a0\u5727\u30bf\u30f3\u30af\u304a\u3088\u3073\u4f4e\u6e29\u30bf\u30f3\u30af<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>\u30bf\u30f3\u30af\u69cb\u6210<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u5782\u76f4\u3001\u5186\u7b52\u5f62\u3001\u5e73\u5e95<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u5f37\u5316\u30b7\u30a7\u30eb\u69cb\u9020\u3001\u30c9\u30fc\u30e0\u578b\u5c4b\u6839<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>\u4e00\u822c\u7684\u306a\u30bf\u30f3\u30af\u30b5\u30a4\u30ba<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u5927\u5bb9\u91cf\u5927\u6c17\u8caf\u8535<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u5927\u5bb9\u91cf\u306e\u52a0\u5727\u5f0f\u307e\u305f\u306f\u51b7\u8535\u5f0f<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>\u88fd\u4f5c\u30fb\u636e\u4ed8<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u6a19\u6e96\u7684\u306a\u73fe\u5834\u6eb6\u63a5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u3088\u308a\u53b3\u683c\u306a\u6eb6\u63a5\u304a\u3088\u3073\u7ba1\u7406<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>\u4f7f\u7528\u53ef\u80fd\u306a\u6750\u6599<\/b><\/td>\n<td><a href=\"https:\/\/www.kdmsteel.com\/ja\/1066\u70ad\u7d20\u92fc\/\"><b>1066\u70ad\u7d20\u92fc<\/b><\/a><\/td>\n<td><span style=\"font-weight: 400;\">\u3088\u308a\u5e83\u7bc4\u306a\u4f4e\u6e29\u6750\u6599<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>\u691c\u67fb\u304a\u3088\u3073\u8a66\u9a13<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u9650\u5b9a\u7684\u306a\u653e\u5c04\u7dda\u64ae\u5f71<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u5e83\u7bc4\u306a\u975e\u7834\u58ca\u691c\u67fb\u304a\u3088\u3073\u653e\u5c04\u7dda\u691c\u67fb<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>\u5c4b\u6839\u3068\u9589\u9396\u90e8\u306e\u7a2e\u985e<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u56fa\u5b9a\u5c4b\u6839\u307e\u305f\u306f\u6d6e\u304d\u5c4b\u6839<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u8010\u5727\u30c9\u30fc\u30e0\u5c4b\u6839<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>\u7528\u9014\u3068\u7523\u696d\u5229\u7528<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u88fd\u6cb9\u6240\u3001\u30bf\u30fc\u30df\u30ca\u30eb\u3001\u8caf\u6c34\u65bd\u8a2d<\/span><\/td>\n<td><span style=\"font-weight: 400;\">LNG\u3001LPG\u3001\u77f3\u6cb9\u5316\u5b66\u30d7\u30e9\u30f3\u30c8<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"API_650_vs_API_620_%E2%80%93_Which_One_Is_Best\"><\/span><b>API 650\u3068API 620 \u2013 \u3069\u3061\u3089\u304c\u6700\u9069\u304b\uff1f<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49231\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-92.png\" alt=\"\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-92.png 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-92-150x84.png 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-92-768x432.png 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-92-18x10.png 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">\u5e38\u306b\u300c\u6700\u9069\u300d\u3068\u8a00\u3048\u308b\u9078\u629e\u80a2\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002API 650\u306f\u3001\u5ba4\u6e29\u30fb\u5927\u6c17\u5727\u4e0b\u3067\u306e\u4fdd\u7ba1\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002\u4e00\u65b9\u3001\u52a0\u5727\u4e0b\u3084\u6975\u4f4e\u6e29\u4e0b\u3067\u306e\u6db2\u4f53\u4fdd\u7ba1\u306b\u306f\u3001API 620\u306e\u65b9\u304c\u5b89\u5168\u3067\u3059\u3002\u9069\u5207\u306a\u898f\u683c\u306f\u3001\u88fd\u54c1\u306e\u7a2e\u985e\u3001\u6e29\u5ea6\u3001\u5727\u529b\u3001\u305d\u3057\u3066\u9577\u671f\u7684\u306a\u4f7f\u7528\u6761\u4ef6\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u3002\u65e9\u671f\u306b\u8a55\u4fa1\u3092\u884c\u3046\u3053\u3068\u3067\u3001\u9ad8\u984d\u306a\u8a2d\u8a08\u5909\u66f4\u3092\u56de\u907f\u3067\u304d\u307e\u3059\u3002.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs\"><\/span><b>\u3088\u304f\u3042\u308b\u8cea\u554f<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>API 650\u898f\u683c\u306e\u30bf\u30f3\u30af\u306f\u6975\u4f4e\u6e29\u8caf\u8535\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u304b\uff1f<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\"> \u3044\u3044\u3048\u3001\u5168\u304f\u9055\u3044\u307e\u3059\u3002API 650\u898f\u683c\u306e\u30bf\u30f3\u30af\u306f\u4f4e\u6e29\u74b0\u5883\u3067\u306e\u4f7f\u7528\u3092\u60f3\u5b9a\u3057\u3066\u4f5c\u3089\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u5ba4\u6e29\u306b\u8fd1\u3044\u6e29\u5ea6\u306e\u74b0\u5883\u3067\u306e\u307f\u4f7f\u7528\u53ef\u80fd\u3067\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_API_620_tanks_work_when_the_pressure_outside_is_normal\"><\/span><b>API 620\u898f\u683c\u306e\u30bf\u30f3\u30af\u306f\u3001\u5916\u90e8\u5727\u529b\u304c\u6b63\u5e38\u306a\u5834\u5408\u3067\u3082\u4f7f\u7528\u3067\u304d\u307e\u3059\u304b\uff1f<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">API 620\u898f\u683c\u306e\u30bf\u30f3\u30af\u306f\u901a\u5e38\u306e\u7a7a\u6c17\u5727\u3067\u3082\u4f7f\u7528\u53ef\u80fd\u3067\u3059\u304c\u3001\u4e3b\u306b\u9ad8\u3044\u5185\u90e8\u5727\u529b\u304c\u4e88\u6e2c\u3055\u308c\u308b\u5834\u5408\u306b\u9078\u3070\u308c\u307e\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"API_620_or_API_650_Which_costs_less\"><\/span><b>API 620\u3068API 650\u3001\u3069\u3061\u3089\u304c\u5b89\u3044\u3067\u3059\u304b\uff1f<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001API 650\u898f\u683c\u306e\u30bf\u30f3\u30af\u306e\u65b9\u304c\u5b89\u4fa1\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u8a2d\u8a08\u3001\u6750\u6599\u3001\u691c\u67fb\u306b\u95a2\u3059\u308b\u57fa\u6e96\u304c\u305d\u308c\u307b\u3069\u53b3\u3057\u304f\u306a\u3044\u305f\u3081\u3067\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_it_possible_to_change_an_API_650_tank_to_an_API_620_tank\"><\/span><b>API 650\u898f\u683c\u306e\u30bf\u30f3\u30af\u3092API 620\u898f\u683c\u306e\u30bf\u30f3\u30af\u306b\u5909\u66f4\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u304b\uff1f<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">API 650\u304b\u3089API 620\u3078\u306e\u5909\u66f4\u306f\u5bb9\u6613\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4e00\u822c\u7684\u306b\u3001\u5927\u5e45\u306a\u69cb\u9020\u8a2d\u8a08\u306e\u5909\u66f4\u3068\u5f37\u5316\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_are_inspections_done_for_API_620_and_API_650_the_same\"><\/span><b>API 620\u3068API 650\u306e\u691c\u67fb\u65b9\u6cd5\u306f\u3069\u306e\u3088\u3046\u306b\u540c\u3058\u3067\u3059\u304b\uff1f<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">\u3044\u3044\u3048\u3001\u691c\u67fb\u306b\u95a2\u3059\u308b\u898f\u5247\u306f\u898f\u683c\u3054\u3068\u306b\u7570\u306a\u308a\u307e\u3059\u3002API 620\u3067\u306f\u3001\u640d\u50b7\u3092\u4e0e\u3048\u306a\u3044\u3001\u3088\u308a\u5fb9\u5e95\u3057\u305f\u8a66\u9a13\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_API_620_and_API_650_be_used_together\"><\/span><b>API 620\u3068API 650\u306f\u4f75\u7528\u3067\u304d\u307e\u3059\u304b\uff1f<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">\u3044\u3044\u3048\u3001\u3053\u308c\u3089\u306e\u898f\u683c\u3092\u4e92\u3044\u306b\u7f6e\u304d\u63db\u3048\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u9078\u5b9a\u306b\u304a\u3044\u3066\u91cd\u8981\u306a\u306e\u306f\u3001\u8a2d\u8a08\u5727\u529b\u3068\u4f7f\u7528\u6e29\u5ea6\u306e\u307f\u3067\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Do_radiography_tests_have_to_be_done_for_API_620\"><\/span><b>API 620\u3067\u306f\u653e\u5c04\u7dda\u900f\u904e\u8a66\u9a13\u3092\u5b9f\u65bd\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">\u306f\u3044\u3001API 620\u3067\u306f\u653e\u5c04\u7dda\u900f\u904e\u8a66\u9a13\u304c\u7fa9\u52d9\u4ed8\u3051\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u591a\u304f\u306e\u5834\u5408\u3001API 620\u306e\u57fa\u6e96\u306fAPI 650\u3088\u308a\u3082\u53b3\u683c\u3067\u3059\u3002.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_temperature_play_a_role_in_choosing_between_API_620_and_650\"><\/span><b>API 620\u3068650\u306e\u3069\u3061\u3089\u3092\u9078\u3076\u304b\u306b\u304a\u3044\u3066\u3001\u6e29\u5ea6\u306f\u91cd\u8981\u306a\u8981\u7d20\u306b\u306a\u308a\u307e\u3059\u304b\uff1f<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">\u306f\u3044\u3001\u5929\u5019\u306f\u898f\u683c\u3092\u9078\u629e\u3059\u308b\u4e0a\u3067\u975e\u5e38\u306b\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u4f4e\u6e29\u74b0\u5883\u4e0b\u3067\u306e\u52d5\u4f5c\u304c\u6c42\u3081\u3089\u308c\u308b\u7528\u9014\u3067\u306f\u3001\u901a\u5e38API 620\u898f\u683c\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Get_Customized_Storage_Tanks_from_KDM_Steel\"><\/span><b>KDM Steel\u3067\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3055\u308c\u305f\u8caf\u8535\u30bf\u30f3\u30af\u3092\u624b\u306b\u5165\u308c\u3088\u3046<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-49232\" src=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-93.png\" alt=\"\" width=\"1280\" height=\"720\" srcset=\"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-93.png 1280w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-93-150x84.png 150w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-93-768x432.png 768w, https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-93-18x10.png 18w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u30cb\u30fc\u30ba\u306b\u5fdc\u3058\u3066\u3001,<\/span> <span style=\"font-weight: 400;\">KDM\u30b9\u30c1\u30fc\u30eb<\/span><span style=\"font-weight: 400;\"> API 650 \u307e\u305f\u306f API 620 \u898f\u683c\u306b\u6e96\u62e0\u3057\u305f\u8a2d\u8a08\u306e\u8caf\u8535\u30bf\u30f3\u30af\u3092\u88fd\u9020\u3067\u304d\u307e\u3059\u3002\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u958b\u59cb\u3059\u308b\u306b\u306f\u3001\u5f53\u793e\u306e\u8caf\u8535\u30bf\u30f3\u30af\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3001\u9244\u9aa8\u52a0\u5de5\u30b5\u30fc\u30d3\u30b9\u3001\u54c1\u8cea\u7ba1\u7406\u30d7\u30ed\u30bb\u30b9\u30b5\u30fc\u30d3\u30b9\u3001\u304a\u3088\u3073<\/span><a href=\"https:\/\/www.kdmsteel.com\/ja\/\u63a5\u89e6\/\"> <b>\u304a\u554f\u3044\u5408\u308f\u305b<\/b><\/a><span style=\"font-weight: 400;\"> \u4eca\u3059\u3050\u304a\u554f\u3044\u5408\u308f\u305b\u3044\u305f\u3060\u3051\u308c\u3070\u3001\u304a\u5ba2\u69d8\u306b\u5408\u308f\u305b\u305f\u304a\u898b\u7a4d\u3082\u308a\u3092\u3054\u63d0\u4f9b\u3044\u305f\u3057\u307e\u3059\u3002.<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>API 650 vs. API 620 is often the question that comes up when choosing a welded steel holding tank for oil, gas or chemical service. Both standards come from the American Petroleum Institute and tell you how to build a tank, but they are for different temperatures and pressures. Making the right choice will protect [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":49227,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"disabled","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-49226","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>API 650 vs API 620 \u2013 Which One Should You Choose for Your Storage Tank? - KDM Steel<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"API 650 vs API 620 \u2013 Which One Should You Choose for Your Storage Tank? - KDM Steel\" \/>\n<meta property=\"og:description\" content=\"API 650 vs. API 620 is often the question that comes up when choosing a welded steel holding tank for oil, gas or chemical service. Both standards come from the American Petroleum Institute and tell you how to build a tank, but they are for different temperatures and pressures. Making the right choice will protect [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/\" \/>\n<meta property=\"og:site_name\" content=\"KDM Steel\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-26T10:35:30+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-07T10:30:30+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-88.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"KDM Steel\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"KDM Steel\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"10\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/\"},\"author\":{\"name\":\"KDM Steel\",\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/#\\\/schema\\\/person\\\/20f9dd106f5824b75813f83f5a192a5f\"},\"headline\":\"API 650 vs API 620 \u2013 Which One Should You Choose for Your Storage Tank?\",\"datePublished\":\"2026-02-26T10:35:30+00:00\",\"dateModified\":\"2026-03-07T10:30:30+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/\"},\"wordCount\":1858,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.kdmsteel.com\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/ARTICLE-88.png\",\"articleSection\":[\"Blog\"],\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/\",\"url\":\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/\",\"name\":\"API 650 vs API 620 \u2013 Which One Should You Choose for Your Storage Tank? - KDM Steel\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.kdmsteel.com\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/ARTICLE-88.png\",\"datePublished\":\"2026-02-26T10:35:30+00:00\",\"dateModified\":\"2026-03-07T10:30:30+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/#breadcrumb\"},\"inLanguage\":\"ja\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.kdmsteel.com\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/ARTICLE-88.png\",\"contentUrl\":\"https:\\\/\\\/www.kdmsteel.com\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/ARTICLE-88.png\",\"width\":1280,\"height\":720},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/api-650-vs-api-620\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.kdmsteel.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"API 650 vs API 620 \u2013 Which One Should You Choose for Your Storage Tank?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/#website\",\"url\":\"https:\\\/\\\/www.kdmsteel.com\\\/\",\"name\":\"KDM Steel\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.kdmsteel.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"ja\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/#organization\",\"name\":\"KDM Steel\",\"url\":\"https:\\\/\\\/www.kdmsteel.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.kdmsteel.com\\\/wp-content\\\/uploads\\\/2024\\\/05\\\/cropped-kdmsteel-logo.png\",\"contentUrl\":\"https:\\\/\\\/www.kdmsteel.com\\\/wp-content\\\/uploads\\\/2024\\\/05\\\/cropped-kdmsteel-logo.png\",\"width\":998,\"height\":535,\"caption\":\"KDM Steel\"},\"image\":{\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.kdmsteel.com\\\/#\\\/schema\\\/person\\\/20f9dd106f5824b75813f83f5a192a5f\",\"name\":\"KDM Steel\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"ja\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/64b16d13078b1bec337dbb31f593dfd16bc530c88ca9fe9b1c9d2a002408080e?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/64b16d13078b1bec337dbb31f593dfd16bc530c88ca9fe9b1c9d2a002408080e?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/64b16d13078b1bec337dbb31f593dfd16bc530c88ca9fe9b1c9d2a002408080e?s=96&d=mm&r=g\",\"caption\":\"KDM Steel\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"API 650\u3068API 620 \u2013 \u8caf\u8535\u30bf\u30f3\u30af\u306b\u306f\u3069\u3061\u3089\u3092\u9078\u3076\u3079\u304d\u304b\uff1f - KDM Steel","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/","og_locale":"ja_JP","og_type":"article","og_title":"API 650 vs API 620 \u2013 Which One Should You Choose for Your Storage Tank? - KDM Steel","og_description":"API 650 vs. API 620 is often the question that comes up when choosing a welded steel holding tank for oil, gas or chemical service. Both standards come from the American Petroleum Institute and tell you how to build a tank, but they are for different temperatures and pressures. Making the right choice will protect [&hellip;]","og_url":"https:\/\/www.kdmsteel.com\/ja\/api-650\u3068api-620\u306e\u6bd4\u8f03\/","og_site_name":"KDM Steel","article_published_time":"2026-02-26T10:35:30+00:00","article_modified_time":"2026-03-07T10:30:30+00:00","og_image":[{"width":1280,"height":720,"url":"http:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-88.png","type":"image\/png"}],"author":"KDM Steel","twitter_card":"summary_large_image","twitter_misc":{"\u57f7\u7b46\u8005":"KDM Steel","\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593":"10\u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/#article","isPartOf":{"@id":"https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/"},"author":{"name":"KDM Steel","@id":"https:\/\/www.kdmsteel.com\/#\/schema\/person\/20f9dd106f5824b75813f83f5a192a5f"},"headline":"API 650 vs API 620 \u2013 Which One Should You Choose for Your Storage Tank?","datePublished":"2026-02-26T10:35:30+00:00","dateModified":"2026-03-07T10:30:30+00:00","mainEntityOfPage":{"@id":"https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/"},"wordCount":1858,"commentCount":0,"publisher":{"@id":"https:\/\/www.kdmsteel.com\/#organization"},"image":{"@id":"https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/#primaryimage"},"thumbnailUrl":"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-88.png","articleSection":["Blog"],"inLanguage":"ja","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/","url":"https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/","name":"API 650\u3068API 620 \u2013 \u8caf\u8535\u30bf\u30f3\u30af\u306b\u306f\u3069\u3061\u3089\u3092\u9078\u3076\u3079\u304d\u304b\uff1f - KDM Steel","isPartOf":{"@id":"https:\/\/www.kdmsteel.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/#primaryimage"},"image":{"@id":"https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/#primaryimage"},"thumbnailUrl":"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-88.png","datePublished":"2026-02-26T10:35:30+00:00","dateModified":"2026-03-07T10:30:30+00:00","breadcrumb":{"@id":"https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/#breadcrumb"},"inLanguage":"ja","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/"]}]},{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/#primaryimage","url":"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-88.png","contentUrl":"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2026\/02\/ARTICLE-88.png","width":1280,"height":720},{"@type":"BreadcrumbList","@id":"https:\/\/www.kdmsteel.com\/api-650-vs-api-620\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.kdmsteel.com\/"},{"@type":"ListItem","position":2,"name":"API 650 vs API 620 \u2013 Which One Should You Choose for Your Storage Tank?"}]},{"@type":"WebSite","@id":"https:\/\/www.kdmsteel.com\/#website","url":"https:\/\/www.kdmsteel.com\/","name":"KDM\u30b9\u30c1\u30fc\u30eb","description":"","publisher":{"@id":"https:\/\/www.kdmsteel.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.kdmsteel.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"ja"},{"@type":"Organization","@id":"https:\/\/www.kdmsteel.com\/#organization","name":"KDM\u30b9\u30c1\u30fc\u30eb","url":"https:\/\/www.kdmsteel.com\/","logo":{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/www.kdmsteel.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2024\/05\/cropped-kdmsteel-logo.png","contentUrl":"https:\/\/www.kdmsteel.com\/wp-content\/uploads\/2024\/05\/cropped-kdmsteel-logo.png","width":998,"height":535,"caption":"KDM Steel"},"image":{"@id":"https:\/\/www.kdmsteel.com\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.kdmsteel.com\/#\/schema\/person\/20f9dd106f5824b75813f83f5a192a5f","name":"KDM\u30b9\u30c1\u30fc\u30eb","image":{"@type":"ImageObject","inLanguage":"ja","@id":"https:\/\/secure.gravatar.com\/avatar\/64b16d13078b1bec337dbb31f593dfd16bc530c88ca9fe9b1c9d2a002408080e?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/64b16d13078b1bec337dbb31f593dfd16bc530c88ca9fe9b1c9d2a002408080e?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/64b16d13078b1bec337dbb31f593dfd16bc530c88ca9fe9b1c9d2a002408080e?s=96&d=mm&r=g","caption":"KDM Steel"}}]}},"_links":{"self":[{"href":"https:\/\/www.kdmsteel.com\/ja\/wp-json\/wp\/v2\/posts\/49226","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kdmsteel.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kdmsteel.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kdmsteel.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kdmsteel.com\/ja\/wp-json\/wp\/v2\/comments?post=49226"}],"version-history":[{"count":2,"href":"https:\/\/www.kdmsteel.com\/ja\/wp-json\/wp\/v2\/posts\/49226\/revisions"}],"predecessor-version":[{"id":49661,"href":"https:\/\/www.kdmsteel.com\/ja\/wp-json\/wp\/v2\/posts\/49226\/revisions\/49661"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.kdmsteel.com\/ja\/wp-json\/wp\/v2\/media\/49227"}],"wp:attachment":[{"href":"https:\/\/www.kdmsteel.com\/ja\/wp-json\/wp\/v2\/media?parent=49226"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kdmsteel.com\/ja\/wp-json\/wp\/v2\/categories?post=49226"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kdmsteel.com\/ja\/wp-json\/wp\/v2\/tags?post=49226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}