{"id":17034,"date":"2026-08-11T07:37:49","date_gmt":"2026-08-11T07:37:49","guid":{"rendered":"https:\/\/pandapipe.com\/?p=17034"},"modified":"2026-08-11T07:37:50","modified_gmt":"2026-08-11T07:37:50","slug":"what-is-nb-in-pipe","status":"publish","type":"post","link":"https:\/\/pandapipe.com\/ru\/faq\/what-is-nb-in-pipe\/","title":{"rendered":"\u0427\u0442\u043e \u0442\u0430\u043a\u043e\u0435 NB \u0432 \u0442\u0440\u0443\u0431\u0435"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"17034\" class=\"elementor elementor-17034\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0e24ab7 e-con-full e-flex e-con e-parent\" data-id=\"0e24ab7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-95bdb7e elementor-widget elementor-widget-text-editor\" data-id=\"95bdb7e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<article data-content=\"[{&quot;type&quot;:&quot;block&quot;,&quot;id&quot;:&quot;Uinm-1768188746511&quot;,&quot;name&quot;:&quot;paragraph&quot;,&quot;data&quot;:{&quot;style&quot;:{}},&quot;nodes&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;id&quot;:&quot;Almg-1768188746509&quot;,&quot;leaves&quot;:[{&quot;text&quot;:&quot;When\u00a0you\u00a0first\u00a0heard\u00a0\u201cWhat\u00a0Is\u00a0NB\u00a0in\u00a0Pipe,\u201d\u00a0did\u00a0you\u00a0also\u00a0find\u00a0it\u00a0confusing?\u00a0How\u00a0can\u00a0you\u00a0avoid\u00a0pitfalls\u00a0when\u00a0buying\u00a0steel\u00a0pipes?\u00a0NB\u00a0=\u00a0Nominal\u00a0Bore.&quot;,&quot;marks&quot;:[]}]}],&quot;state&quot;:{}}]\"><div>NB stands for Nominal Bore. It is a nominal pipe size designation, not the pipe\u2019s exact inside diameter or outside diameter. In many <a href=\"https:\/\/pandapipe.com\/blog\/steel-pipe-chart\/\">steel pipe specifications<\/a>, NB is used interchangeably with NPS, while DN is the corresponding metric designation. For example, 2-inch NB is generally equivalent to NPS 2 and DN 50, with an actual outside diameter of 60.3 mm. How can you avoid pitfalls when buying steel pipes? <strong>NB = Nominal Bore<\/strong>.<\/div><\/article>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b8169c6 elementor-widget elementor-widget-heading\" data-id=\"b8169c6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What Does NB Mean in Pipe?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c3a8e2c elementor-widget elementor-widget-text-editor\" data-id=\"c3a8e2c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"PDq2pG_selectionAnchorContainer\" data-start=\"76\" data-end=\"363\"><strong>NB stands for Nominal Bore<\/strong>. It is a standardized pipe size designation used to identify compatible pipes, fittings, flanges and valves. NB is a nominal name rather than an exact measured dimension, so it should not be treated as the pipe\u2019s actual inside diameter or outside diameter.<\/p><p class=\"\" data-start=\"365\" data-end=\"654\">The term \u201cbore\u201d comes from earlier pipe-sizing systems in which the nominal size was approximately related to the internal opening of a standard-wall pipe. As additional wall thicknesses and pipe schedules were introduced, pipes with the same NB size could have different inside diameters.<\/p><p data-start=\"656\" data-end=\"864\">For example, both 2-inch NB SCH 40 and 2-inch NB SCH 80 pipes have the same outside diameter of <strong data-start=\"752\" data-end=\"778\">2.375 inches (60.3 mm)<\/strong>. However, the SCH 80 pipe has a thicker wall and therefore a smaller inside diameter.<\/p><p data-start=\"866\" data-end=\"1065\">In steel pipe specifications, NB is often used interchangeably with <strong data-start=\"934\" data-end=\"961\">NPS (Nominal Pipe Size)<\/strong>. The corresponding metric designation is generally expressed as <strong data-start=\"1026\" data-end=\"1051\">DN (Nominal Diameter)<\/strong>. For example:<\/p><ul data-start=\"1067\" data-end=\"1164\"><li data-section-id=\"d9q7dz\" data-start=\"1067\" data-end=\"1098\"><strong data-start=\"1069\" data-end=\"1098\">2-inch NB = NPS 2 = DN 50<\/strong><\/li><li data-section-id=\"b8b303\" data-start=\"1099\" data-end=\"1131\"><strong data-start=\"1101\" data-end=\"1131\">4-inch NB = NPS 4 = DN 100<\/strong><\/li><li data-section-id=\"ito786\" data-start=\"1132\" data-end=\"1164\"><strong data-start=\"1134\" data-end=\"1164\">6-inch NB = NPS 6 = DN 150<\/strong><\/li><\/ul><p data-start=\"1166\" data-end=\"1424\">These designations identify corresponding nominal pipe sizes; they are not direct measurements or simple unit conversions. Therefore, a buyer should specify the NB, NPS or DN size together with the pipe schedule or wall thickness when requesting a quotation.<\/p><blockquote data-start=\"1426\" data-end=\"1544\" data-is-last-node=\"\" data-is-only-node=\"\"><p data-start=\"1428\" data-end=\"1544\" data-is-last-node=\"\"><strong data-start=\"1428\" data-end=\"1442\">Key point:<\/strong> NB identifies a nominal pipe size. It does not tell you the exact OD, ID or wall thickness by itself.<\/p><\/blockquote>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c32d811 elementor-widget elementor-widget-heading\" data-id=\"c32d811\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Is NB the Same as NPS or DN<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7aaf979 elementor-widget elementor-widget-text-editor\" data-id=\"7aaf979\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<table><thead><tr><th>Term<\/th><th>Full Form<\/th><th>Typical System<\/th><th>Example<\/th><\/tr><\/thead><tbody><tr><td>NB<\/td><td>Nominal Bore<\/td><td>Common British\/international usage<\/td><td>2-inch NB<\/td><\/tr><tr><td>NPS<\/td><td>Nominal Pipe Size<\/td><td>North American\/inch designation<\/td><td>NPS 2<\/td><\/tr><tr><td>DN<\/td><td>Diam\u00e8tre Nominal \/ Nominal Diameter<\/td><td>Metric designation<\/td><td>DN 50<\/td><\/tr><tr><td>OD<\/td><td>Outside Diameter<\/td><td>Actual measured dimension<\/td><td>60.3 mm<\/td><\/tr><tr><td>ID<\/td><td>Inside Diameter<\/td><td>Calculated\/measured opening<\/td><td>Changes with schedule<\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d8c8192 elementor-widget elementor-widget-heading\" data-id=\"d8c8192\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">NB Pipe Size Chart<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-11d8f3c elementor-widget elementor-widget-text-editor\" data-id=\"11d8f3c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<table><thead><tr><th align=\"right\">NB<\/th><th align=\"right\">NPS<\/th><th align=\"right\">DN<\/th><th align=\"right\">Actual OD (inch)<\/th><th align=\"right\">Actual OD (mm)<\/th><\/tr><\/thead><tbody><tr><td align=\"right\">1\/2 inch<\/td><td align=\"right\">1\/2<\/td><td align=\"right\">DN 15<\/td><td align=\"right\">0.840<\/td><td align=\"right\">21.3<\/td><\/tr><tr><td align=\"right\">3\/4 inch<\/td><td align=\"right\">3\/4<\/td><td align=\"right\">DN 20<\/td><td align=\"right\">1.050<\/td><td align=\"right\">26.7<\/td><\/tr><tr><td align=\"right\">1 inch<\/td><td align=\"right\">1<\/td><td align=\"right\">DN 25<\/td><td align=\"right\">1.315<\/td><td align=\"right\">33.4<\/td><\/tr><tr><td align=\"right\">1 1\/4 inch<\/td><td align=\"right\">1 1\/4<\/td><td align=\"right\">DN 32<\/td><td align=\"right\">1.660<\/td><td align=\"right\">42.2<\/td><\/tr><tr><td align=\"right\">1 1\/2 inch<\/td><td align=\"right\">1 1\/2<\/td><td align=\"right\">DN 40<\/td><td align=\"right\">1.900<\/td><td align=\"right\">48.3<\/td><\/tr><tr><td align=\"right\">2 inch<\/td><td align=\"right\">2<\/td><td align=\"right\">DN 50<\/td><td align=\"right\">2.375<\/td><td align=\"right\">60.3<\/td><\/tr><tr><td align=\"right\">2 1\/2 inch<\/td><td align=\"right\">2 1\/2<\/td><td align=\"right\">DN 65<\/td><td align=\"right\">2.875<\/td><td align=\"right\">73.0<\/td><\/tr><tr><td align=\"right\">3 inch<\/td><td align=\"right\">3<\/td><td align=\"right\">DN 80<\/td><td align=\"right\">3.500<\/td><td align=\"right\">88.9<\/td><\/tr><tr><td align=\"right\">4 inch<\/td><td align=\"right\">4<\/td><td align=\"right\">DN 100<\/td><td align=\"right\">4.500<\/td><td align=\"right\">114.3<\/td><\/tr><tr><td align=\"right\">5 inch<\/td><td align=\"right\">5<\/td><td align=\"right\">DN 125<\/td><td align=\"right\">5.563<\/td><td align=\"right\">141.3<\/td><\/tr><tr><td align=\"right\">6 inch<\/td><td align=\"right\">6<\/td><td align=\"right\">DN 150<\/td><td align=\"right\">6.625<\/td><td align=\"right\">168.3<\/td><\/tr><tr><td align=\"right\">8 inch<\/td><td align=\"right\">8<\/td><td align=\"right\">DN 200<\/td><td align=\"right\">8.625<\/td><td align=\"right\">219.1<\/td><\/tr><tr><td align=\"right\">10 inch<\/td><td align=\"right\">10<\/td><td align=\"right\">DN 250<\/td><td align=\"right\">10.750<\/td><td align=\"right\">273.0<\/td><\/tr><tr><td align=\"right\">12 inch<\/td><td align=\"right\">12<\/td><td align=\"right\">DN 300<\/td><td align=\"right\">12.750<\/td><td align=\"right\">323.9<\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f6ef3b6 elementor-widget elementor-widget-text-editor\" data-id=\"f6ef3b6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>OD values should be verified against the applicable dimensional standard and project specification before ordering.<\/p><p>See our complete <a class=\"decorated-link\" href=\"https:\/\/pandapipe.com\/blog\/nominal-pipe-size\/\" target=\"_new\" rel=\"noopener\" data-start=\"4568\" data-end=\"4640\" data-wplink-edit=\"true\">Nominal Pipe Size chart<\/a> for additional sizes and schedules.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b9f4ab5 elementor-widget elementor-widget-heading\" data-id=\"b9f4ab5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why Does Pipe Schedule Change ID but Not OD?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cdca3c7 elementor-widget elementor-widget-text-editor\" data-id=\"cdca3c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"PDq2pG_selectionAnchorContainer\" data-start=\"135\" data-end=\"310\">For a given NB or NPS size, the <a href=\"https:\/\/pandapipe.com\/blog\/outer-diameter\/\">pipe\u2019s outside diameter<\/a> remains fixed. The <a href=\"https:\/\/pandapipe.com\/pipe-schedule-chart\/\">pipe schedule<\/a>, such as <a href=\"https:\/\/pandapipe.com\/blog\/schedule-40-vs-80-steel-pipe\/\">SCH 40 or SCH 80<\/a>, determines the wall thickness rather than the nominal size.<\/p><p data-start=\"312\" data-end=\"550\">When the schedule increases, the pipe wall becomes thicker and the inside diameter becomes smaller. The outside diameter does not change. This allows pipes, fittings and flanges of the same nominal size to remain dimensionally compatible.<\/p><p data-start=\"552\" data-end=\"595\">The inside diameter can be estimated using:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e2f8e4a elementor-widget elementor-widget-text-editor\" data-id=\"e2f8e4a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"PDq2pG_selectionAnchorContainer\" data-start=\"597\" data-end=\"629\"><span style=\"color: #ffffff;\"><strong data-start=\"597\" data-end=\"629\">ID = OD \u2212 2 \u00d7 Wall Thickness<\/strong><\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ebc07e0 elementor-widget elementor-widget-text-editor\" data-id=\"ebc07e0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"PDq2pG_selectionAnchorContainer\" data-start=\"631\" data-end=\"803\">For example, both <a href=\"https:\/\/pandapipe.com\/blog\/schedule-40-pipe\/\">NPS 2 SCH 40<\/a> and NPS 2 SCH 80 steel pipes have an outside diameter of 2.375 inches (60.3 mm). However, their wall thicknesses and inside diameters differ:<\/p><div class=\"group TyagGW_tableContainer\"><div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\"><table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"805\" data-end=\"1065\"><thead data-start=\"805\" data-end=\"884\"><tr data-start=\"805\" data-end=\"884\"><th class=\"last:pe-10\" data-start=\"805\" data-end=\"817\" data-col-size=\"sm\">Pipe Size<\/th><th class=\"last:pe-10\" data-start=\"817\" data-end=\"836\" data-col-size=\"sm\">Outside Diameter<\/th><th class=\"last:pe-10\" data-start=\"836\" data-end=\"853\" data-col-size=\"sm\">Wall Thickness<\/th><th class=\"last:pe-10\" data-start=\"853\" data-end=\"884\" data-col-size=\"sm\">Approximate Inside Diameter<\/th><\/tr><\/thead><tbody data-start=\"906\" data-end=\"1065\"><tr data-start=\"906\" data-end=\"985\"><td data-start=\"906\" data-end=\"921\" data-col-size=\"sm\">NPS 2 SCH 40<\/td><td data-col-size=\"sm\" data-start=\"921\" data-end=\"942\">2.375 in (60.3 mm)<\/td><td data-col-size=\"sm\" data-start=\"942\" data-end=\"963\">0.154 in (3.91 mm)<\/td><td data-col-size=\"sm\" data-start=\"963\" data-end=\"985\">2.067 in (52.5 mm)<\/td><\/tr><tr data-start=\"986\" data-end=\"1065\"><td data-start=\"986\" data-end=\"1001\" data-col-size=\"sm\">NPS 2 SCH 80<\/td><td data-col-size=\"sm\" data-start=\"1001\" data-end=\"1022\">2.375 in (60.3 mm)<\/td><td data-col-size=\"sm\" data-start=\"1022\" data-end=\"1043\">0.218 in (5.54 mm)<\/td><td data-col-size=\"sm\" data-start=\"1043\" data-end=\"1065\">1.939 in (49.2 mm)<\/td><\/tr><\/tbody><\/table><\/div><\/div><p data-start=\"1067\" data-end=\"1257\">This is why a 2-inch NB pipe should not be interpreted as having an exact 2-inch inside or outside diameter. <strong>Always specify both the nominal size and the required schedule or wall thickness.<\/strong><\/p><blockquote data-start=\"1259\" data-end=\"1418\"><p data-start=\"1261\" data-end=\"1418\"><strong data-start=\"1261\" data-end=\"1278\">Buyer\u2019s note:<\/strong> <strong>A higher schedule does not mean a larger pipe diameter.<\/strong> It means a thicker pipe wall and a smaller internal opening for the same NB or NPS.<\/p><\/blockquote>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-79d5872 elementor-widget elementor-widget-heading\" data-id=\"79d5872\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How to Specify NB Pipe in an RFQ<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4e343fd elementor-widget elementor-widget-text-editor\" data-id=\"4e343fd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p class=\"PDq2pG_selectionAnchorContainer\" data-start=\"1457\" data-end=\"1674\">Writing only \u201c2-inch NB pipe\u201d is not enough for a supplier to prepare an accurate quotation. Pipes with the same nominal size may have different standards, grades, wall thicknesses, manufacturing methods and finishes.<\/p><p data-start=\"1676\" data-end=\"1724\">A quote-ready steel pipe inquiry should include:<\/p><ul data-start=\"1726\" data-end=\"2302\"><li data-section-id=\"hh5h5u\" data-start=\"1726\" data-end=\"1763\"><strong data-start=\"1728\" data-end=\"1737\">Size:<\/strong> NB, NPS or DN designation<\/li><li data-section-id=\"16o8sr\" data-start=\"1764\" data-end=\"1834\"><strong data-start=\"1766\" data-end=\"1779\">Standard:<\/strong> ASTM, API, EN, JIS or another applicable specification<\/li><li data-section-id=\"12yz9d0\" data-start=\"1835\" data-end=\"1885\"><strong data-start=\"1837\" data-end=\"1859\">Material or grade:<\/strong> such as ASTM A106 Grade B<\/li><li data-section-id=\"mb3we3\" data-start=\"1886\" data-end=\"1956\"><strong data-start=\"1888\" data-end=\"1907\">Wall thickness:<\/strong> schedule number or wall thickness in millimetres<\/li><li data-section-id=\"1qazaf0\" data-start=\"1957\" data-end=\"2012\"><strong data-start=\"1959\" data-end=\"1984\">Manufacturing method:<\/strong> seamless, ERW, LSAW or SSAW<\/li><li data-section-id=\"cqp6t9\" data-start=\"2013\" data-end=\"2066\"><strong data-start=\"2015\" data-end=\"2029\">Pipe ends:<\/strong> plain, bevelled, threaded or grooved<\/li><li data-section-id=\"1e36drw\" data-start=\"2067\" data-end=\"2136\"><strong data-start=\"2069\" data-end=\"2088\">Surface finish:<\/strong> black, galvanized, painted or externally coated<\/li><li data-section-id=\"ojcutp\" data-start=\"2137\" data-end=\"2188\"><strong data-start=\"2139\" data-end=\"2150\">Length:<\/strong> fixed, random or double-random length<\/li><li data-section-id=\"1685tvv\" data-start=\"2189\" data-end=\"2235\"><strong data-start=\"2191\" data-end=\"2204\">Quantity:<\/strong> pieces, metres or total weight<\/li><li data-section-id=\"kkfcni\" data-start=\"2236\" data-end=\"2302\"><strong data-start=\"2238\" data-end=\"2254\">Application:<\/strong> service medium and relevant design requirements<\/li><\/ul><p data-start=\"2304\" data-end=\"2323\">Instead of writing:<\/p><blockquote data-start=\"2325\" data-end=\"2353\"><p data-start=\"2327\" data-end=\"2353\">Need 2-inch NB steel pipe.<\/p><\/blockquote><p data-start=\"2355\" data-end=\"2383\">Use a specification such as:<\/p><blockquote data-start=\"2385\" data-end=\"2534\"><p data-start=\"2387\" data-end=\"2534\">NPS 2 (DN 50) seamless carbon steel pipe, <a href=\"https:\/\/pandapipe.com\/blog\/astm-a106-grade-b\/\">ASTM A106 Grade B<\/a>, <a href=\"https:\/\/pandapipe.com\/blog\/how-thick-is-schedule-40-pipe\/\">SCH 40<\/a>, plain ends, black finish, 6 m fixed lengths, 500 pieces, for a water pipeline.<\/p><\/blockquote><p data-start=\"2536\" data-end=\"2796\">If the pipe is intended for pressure service, also provide the design pressure, design temperature and any testing, inspection or certification requirements. This helps the supplier confirm whether the requested standard, grade and wall thickness are suitable.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f75fbd2 elementor-widget elementor-widget-text-editor\" data-id=\"f75fbd2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>FAQ<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-70128e9 elementor-widget elementor-widget-text-editor\" data-id=\"70128e9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h4 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"5425\" data-end=\"5472\">1. Is NB the same as pipe inside diameter?<\/h4><p data-start=\"5474\" data-end=\"5592\">No. NB is a nominal designation. The actual inside diameter depends on the pipe\u2019s outside diameter and wall thickness.<\/p><h4 data-start=\"5594\" data-end=\"5624\">2. Is NB the same as NPS?<\/h4><p data-start=\"5626\" data-end=\"5758\">They are commonly used interchangeably in steel pipe purchasing, although NPS is the formal North American nominal size designation.<\/p><h4 data-start=\"5760\" data-end=\"5789\">3. Is NB the same as DN?<\/h4><p data-start=\"5791\" data-end=\"5935\">They identify corresponding nominal pipe sizes in different designation systems. For example, 2-inch NB or NPS 2 generally corresponds to DN 50.<\/p><h4 data-start=\"5937\" data-end=\"5994\">4. What is the outside diameter of a 2-inch NB pipe?<\/h4><p data-start=\"5996\" data-end=\"6081\">A standard NPS 2\/DN 50 steel pipe has an outside diameter of 2.375 inches or 60.3 mm.<\/p><h4 data-start=\"6083\" data-end=\"6129\">5. Does pipe schedule change the NB size?<\/h4><p data-start=\"6131\" data-end=\"6253\">No. Schedule changes the wall thickness and inside diameter, while the nominal size and outside diameter remain unchanged.<\/p><h4 data-start=\"6255\" data-end=\"6294\">6. Can NB be used for steel tubes?<\/h4><p data-start=\"6296\" data-end=\"6462\">Normally, tubes are ordered by actual outside diameter and wall thickness rather than NB or NPS. Do not assume a 2-inch tube has the same dimensions as an NPS 2 pipe.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4f62377 elementor-widget elementor-widget-button\" data-id=\"4f62377\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/pandapipe.com\/carbon-steel-pipe-suppliers\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">CONTACT US<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-120c394 e-flex e-con-boxed e-con e-parent\" data-id=\"120c394\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-85f36df elementor-widget elementor-widget-heading\" data-id=\"85f36df\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">References<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dce21a9 elementor-widget elementor-widget-text-editor\" data-id=\"dce21a9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<article data-content=\"[{&quot;type&quot;:&quot;block&quot;,&quot;id&quot;:&quot;UQu6-1768189111614&quot;,&quot;name&quot;:&quot;paragraph&quot;,&quot;data&quot;:{&quot;style&quot;:null},&quot;nodes&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;id&quot;:&quot;LXyc-1768189111613&quot;,&quot;leaves&quot;:[{&quot;text&quot;:&quot;Engineering\u00a0ToolBox\u00a0\u2013\u00a0Nominal\u00a0Pipe\u00a0Size\u00a0(NPS).&quot;,&quot;marks&quot;:[]}]}],&quot;state&quot;:{}}]\"><div><a href=\"https:\/\/pandapipe.com\/blog\/nominal-pipe-size\/\">Engineering ToolBox \u2013 Nominal Pipe Size (NPS).<\/a><\/div><div>\u00a0<\/div><\/article><div><article data-content=\"[{&quot;type&quot;:&quot;block&quot;,&quot;id&quot;:&quot;9O0B-1768189007889&quot;,&quot;name&quot;:&quot;paragraph&quot;,&quot;data&quot;:{&quot;style&quot;:null},&quot;nodes&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;id&quot;:&quot;jRhJ-1768189007888&quot;,&quot;leaves&quot;:[{&quot;text&quot;:&quot;Nominal\u00a0Bore\u00a0\u2013\u00a0Wikipedia.&quot;,&quot;marks&quot;:[]}]},{&quot;type&quot;:&quot;inline&quot;,&quot;id&quot;:&quot;KPVU-1768189111605&quot;,&quot;name&quot;:&quot;link&quot;,&quot;data&quot;:{&quot;href&quot;:&quot;https:\/\/en.wikipedia.org\/wiki\/Nominal_pipe_size&quot;},&quot;nodes&quot;:[{&quot;type&quot;:&quot;text&quot;,&quot;id&quot;:&quot;lxDK-1768189111611&quot;,&quot;leaves&quot;:[{&quot;text&quot;:&quot;&quot;,&quot;marks&quot;:[]}]}]}],&quot;state&quot;:{}}]\"><div>Nominal Bore \u2013 Wikipedia.<\/div><\/article><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>NB stands for Nominal Bore. It is a nominal pipe size designation, not the pipe\u2019s exact inside diameter or outside diameter. In many steel pipe specifications, NB is used interchangeably with NPS, while DN is the corresponding metric designation. For example, 2-inch NB is generally equivalent to NPS 2 and DN 50, with an actual [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[103],"tags":[],"class_list":["post-17034","post","type-post","status-publish","format-standard","hentry","category-faq"],"_links":{"self":[{"href":"https:\/\/pandapipe.com\/ru\/wp-json\/wp\/v2\/posts\/17034","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pandapipe.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pandapipe.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pandapipe.com\/ru\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/pandapipe.com\/ru\/wp-json\/wp\/v2\/comments?post=17034"}],"version-history":[{"count":28,"href":"https:\/\/pandapipe.com\/ru\/wp-json\/wp\/v2\/posts\/17034\/revisions"}],"predecessor-version":[{"id":18598,"href":"https:\/\/pandapipe.com\/ru\/wp-json\/wp\/v2\/posts\/17034\/revisions\/18598"}],"wp:attachment":[{"href":"https:\/\/pandapipe.com\/ru\/wp-json\/wp\/v2\/media?parent=17034"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pandapipe.com\/ru\/wp-json\/wp\/v2\/categories?post=17034"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pandapipe.com\/ru\/wp-json\/wp\/v2\/tags?post=17034"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}