{"id":2445,"date":"2025-11-29T01:59:53","date_gmt":"2025-11-28T22:29:53","guid":{"rendered":"https:\/\/tfstrading.com\/pipe\/"},"modified":"2026-10-28T12:23:05","modified_gmt":"2026-10-28T08:53:05","slug":"pipe","status":"publish","type":"page","link":"https:\/\/tfstrading.com\/en\/pipe\/","title":{"rendered":"Pipe"},"content":{"rendered":"<style>.tfs-a{font-size:15.5px;line-height:2;color:#1d2b36}.tfs-a *{box-sizing:border-box}.tfs-a p{margin:0 0 14px;font-size:15.5px;line-height:2}.tfs-a strong{color:#0b2a4a}.tfs-a .tfs-lead{font-size:16.5px;background:#f5f8fc;border-inline-start:4px solid #f43904;border-radius:12px;padding:18px 22px;margin:0 0 20px}.tfs-a .tfs-facts{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:0 0 22px}.tfs-a .tfs-fact{background:linear-gradient(135deg,#0b2a4a,#14467a);color:#fff;border-radius:12px;padding:16px 10px;text-align:center}.tfs-a .tfs-fact b{display:block;font-size:18px;line-height:1.6;color:#fff}.tfs-a .tfs-fact 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summary{background:#f5f8fc;border-bottom:1px solid #e3e9f1}.tfs-a details p{padding:12px 18px 4px;margin:0 0 10px}.tfs-a .tfs-rel{margin:8px 0 0}.tfs-a .tfs-src{background:#f5f8fc;border-radius:12px;padding:14px 38px}.tfs-a .tfs-src li{font-size:13.5px;line-height:1.9;color:#3c4b59}@media(max-width:700px){.tfs-a .tfs-facts{grid-template-columns:repeat(2,1fr)}.tfs-a .tfs-cards{grid-template-columns:1fr}.tfs-a h2{font-size:19px!important}}.tfs-a[dir=ltr],.tfs-a[dir=ltr] *{font-family:\"Segoe UI\",Roboto,\"Helvetica Neue\",Arial,sans-serif!important}.tfs-a[dir=ltr],.tfs-a[dir=ltr] h2,.tfs-a[dir=ltr] h3{text-align:left}.tfs-a[dir=ltr] th{white-space:normal}.tfs-a[dir=ltr] p,.tfs-a[dir=ltr] li{line-height:1.8}.tfs-a td:first-child{white-space:nowrap}.tfs-a .tfs-pcalc{background:#0b2a4a;color:#fff;border-radius:12px;padding:22px;margin:18px 0 22px}.tfs-a .tfs-pc-title{display:block;font-size:17px;font-weight:800;color:#fff;margin-bottom:14px}.tfs-a .tfs-pc-fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px}.tfs-a .tfs-pc-fields label{display:flex;flex-direction:column;gap:4px;font-size:13px;color:#cfdcea;margin:0;min-width:0}.tfs-a .tfs-pc-fields input,.tfs-a .tfs-pc-fields select{font:inherit;font-size:16px;direction:ltr;text-align:center;border:0;border-radius:8px;height:40px;padding:0 10px;background:#fff;color:#1d2b36;width:100%;margin:0;box-shadow:none}.tfs-a .tfs-pc-result{display:grid;grid-template-columns:1fr 1fr;gap:12px;text-align:center;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:12px;padding:16px;margin-top:14px}.tfs-a .tfs-pc-result b{display:block;font-size:24px;font-weight:800;line-height:1.4;color:#fff}.tfs-a .tfs-pc-result span{font-size:13px;color:#cfdcea}.tfs-a .tfs-pcalc .tfs-pc-note{font-size:12.5px!important;color:#cfdcea;margin:12px 0 0;line-height:1.8}.tfs-a .tfs-duo{display:grid;grid-template-columns:1fr 1fr;gap:12px}.tfs-a .tfs-duo img{width:100%;height:100%;aspect-ratio:3\/2;object-fit:cover}.tfs-a .tfs-duo figcaption{grid-column:1\/-1}@media(max-width:560px){.tfs-a .tfs-duo{grid-template-columns:1fr}}<\/style>\n<div class=\"tfs-a\" dir=\"ltr\">\n<p class=\"tfs-lead\">A <strong>steel pipe<\/strong> is a hollow section with a circular cross-section, used to carry fluids such as water, gas, oil and steam, and also as a structural member. This guide covers the types of steel pipe, manufacturing methods, nominal size and schedule, the pipe dimension and weight chart, and the reference standards.<\/p>\n<div class=\"tfs-facts\">\n<div class=\"tfs-fact\"><b>6 and 12 m<\/b><span>Common length<\/span><\/div>\n<div class=\"tfs-fact\"><b>Welded and seamless<\/b><span>Main categories<\/span><\/div>\n<div class=\"tfs-fact\"><b>Inch (NPS) or DN<\/b><span>Size designation<\/span><\/div>\n<div class=\"tfs-fact\"><b>ASME B36.10M<\/b><span>Dimension standard<\/span><\/div>\n<\/div>\n<nav class=\"tfs-toc\"><b>On this page<\/b><a href=\"#what\">What is steel pipe?<\/a><a href=\"#types\">Types of steel pipe by manufacturing method<\/a><a href=\"#uses-type\">Types of pipe by application<\/a><a href=\"#size\">Nominal size and schedule explained<\/a><a href=\"#weight\">Steel pipe dimension and weight chart (Schedule 40)<\/a><a href=\"#application\">Applications of steel pipe<\/a><a href=\"#storage\">Storage notes<\/a><a href=\"#faq\">Frequently asked questions about steel pipe<\/a><a href=\"#related\">Related steel sections<\/a><a href=\"#sources\">References and standards<\/a><\/nav>\n<h2 id=\"what\">What is steel pipe?<\/h2>\n<p>A circular cross-section distributes the internal pressure of a fluid evenly around the wall, which makes a pipe the most suitable shape for carrying fluids under pressure. Thanks to their high strength, resistance to temperature and pressure, and weldability, steel pipes are the backbone of water, gas and oil networks and of industrial plants.<\/p>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3081\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-1.webp\" alt=\"Steel pipes\" width=\"1200\" height=\"800\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-1.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-1-300x200.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-1-1024x683.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-1-768x512.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-1-64x43.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-1-108x72.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-1-118x79.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-1-105x70.webp 105w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-1-207x138.webp 207w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Steel pipe: the round section spreads internal pressure evenly around the wall.<\/figcaption><\/figure>\n<h2 id=\"types\">Types of steel pipe by manufacturing method<\/h2>\n<div class=\"tfs-tw\">\n<table>\n<thead>\n<tr>\n<th>Pipe type<\/th>\n<th>Manufacturing method<\/th>\n<th>Typical diameter range<\/th>\n<th>Typical use<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Seamless<\/td>\n<td>Piercing a hot billet, then rolling<\/td>\n<td>Small to medium<\/td>\n<td>High pressure and temperature, boilers, hydraulics<\/td>\n<\/tr>\n<tr>\n<td>ERW (longitudinal weld)<\/td>\n<td>Forming steel strip, high-frequency resistance weld<\/td>\n<td>Small to medium<\/td>\n<td>Water, gas, structures, scaffolding<\/td>\n<\/tr>\n<tr>\n<td>LSAW (longitudinal weld)<\/td>\n<td>Forming heavy plate, submerged-arc longitudinal weld<\/td>\n<td>Medium to large<\/td>\n<td>Oil and gas transmission, offshore structures<\/td>\n<\/tr>\n<tr>\n<td>Spiral (SSAW)<\/td>\n<td>Helical forming of strip, submerged-arc weld<\/td>\n<td>Large<\/td>\n<td>Water transmission, piling, low-pressure lines<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3>Seamless pipe<\/h3>\n<p>A round steel billet is heated to a high temperature and passed between inclined rolls over a piercing plug, which opens a hole along its centre. Rolling then brings the diameter and wall to their final size. Because the wall has no weld line, its resistance to pressure is uniform all around.<\/p>\n<h3>Welded pipe<\/h3>\n<p>Welded pipe is made by forming steel plate or strip and welding its edges. Depending on the direction of the seam, it is either <strong>longitudinally welded<\/strong> (the seam runs along the pipe) or <strong>spiral welded<\/strong> (a helical seam). This route allows large diameters and a uniform wall thickness.<\/p>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3149\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-5.webp\" alt=\"Large-diameter pipes\" width=\"1200\" height=\"675\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-5.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-5-300x169.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-5-1024x576.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-5-768x432.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-5-64x36.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-5-108x61.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-5-118x66.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-5-124x70.webp 124w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-5-245x138.webp 245w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Steel pipes in medium and large diameters.<\/figcaption><\/figure>\n<h2 id=\"uses-type\">Types of pipe by application<\/h2>\n<div class=\"tfs-cards\">\n<div class=\"tfs-card\"><b>Water and gas pipe<\/b><span>Black or galvanized longitudinally welded pipe used in building water and gas networks, usually with threaded or plain ends.<\/span><\/div>\n<div class=\"tfs-card\"><b>Galvanized pipe<\/b><span>Pipe that has been dipped in molten zinc, so both the inside and outside surfaces carry a protective coating and resist corrosion better.<\/span><\/div>\n<div class=\"tfs-card\"><b>Line pipe (API)<\/b><span>Pipe produced to API 5L for oil and gas transmission; its steel grade is given by a letter and number, such as B or X.<\/span><\/div>\n<div class=\"tfs-card\"><b>Industrial and structural pipe<\/b><span>Used for columns, trusses, supports, masts and machine parts, where carrying fluid is not the purpose.<\/span><\/div>\n<div class=\"tfs-card\"><b>Scaffold tube<\/b><span>Tube with an outside diameter of 48.3 mm, used to build steel scaffolding.<\/span><\/div>\n<div class=\"tfs-card\"><b>Boiler and heat-exchanger tube<\/b><span>Seamless tube designed for service at high temperature and pressure.<\/span><\/div>\n<\/div>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3085\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-3.webp\" alt=\"Bundles of steel pipe in a warehouse\" width=\"1200\" height=\"623\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-3.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-3-300x156.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-3-1024x532.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-3-768x399.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-3-64x33.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-3-108x56.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-3-118x61.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-3-135x70.webp 135w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-3-266x138.webp 266w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Bundles of steel pipe in different diameters for different uses.<\/figcaption><\/figure>\n<h2 id=\"size\">Nominal size and schedule explained<\/h2>\n<p>Pipe size is given as a <strong>nominal size<\/strong>, called NPS in the inch system and DN in the metric system. The nominal size is a designation and does not equal the actual diameter; a 2 inch pipe, for example, has an outside diameter of 60.3 mm.<\/p>\n<p>For each nominal size the outside diameter is fixed, and the <strong>schedule<\/strong> defines the wall thickness. As the schedule number rises, the wall becomes thicker, the inside diameter smaller, and the pipe can withstand higher pressure.<\/p>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2896\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-pipe-section.webp\" alt=\"Outside diameter, inside diameter and wall thickness of a pipe\" width=\"1200\" height=\"600\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-pipe-section.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-pipe-section-300x150.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-pipe-section-1024x512.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-pipe-section-768x384.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-pipe-section-64x32.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-pipe-section-108x54.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-pipe-section-118x59.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-pipe-section-140x70.webp 140w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-pipe-section-276x138.webp 276w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Pipe cross-section: outside diameter (OD), inside diameter (ID) and wall thickness (t).<\/figcaption><\/figure>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3087\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-4.webp\" alt=\"Stacked steel pipes\" width=\"1200\" height=\"839\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-4.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-4-300x210.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-4-1024x716.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-4-768x537.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-4-64x45.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-4-108x76.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-4-118x83.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-4-100x70.webp 100w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-4-197x138.webp 197w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Pipes of different diameters stacked on supports.<\/figcaption><\/figure>\n<h2 id=\"weight\">Steel pipe dimension and weight chart (Schedule 40)<\/h2>\n<div class=\"tfs-tw\">\n<table>\n<thead>\n<tr>\n<th>Nominal size NPS (in)<\/th>\n<th>DN<\/th>\n<th>Outside diameter (mm)<\/th>\n<th>Schedule 40 wall (mm)<\/th>\n<th>Mass per metre (kg)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1\/2<\/td>\n<td>15<\/td>\n<td>21.3<\/td>\n<td>2.77<\/td>\n<td>1.27<\/td>\n<\/tr>\n<tr>\n<td>3\/4<\/td>\n<td>20<\/td>\n<td>26.7<\/td>\n<td>2.87<\/td>\n<td>1.69<\/td>\n<\/tr>\n<tr>\n<td>1<\/td>\n<td>25<\/td>\n<td>33.4<\/td>\n<td>3.38<\/td>\n<td>2.50<\/td>\n<\/tr>\n<tr>\n<td>1 1\/4<\/td>\n<td>32<\/td>\n<td>42.2<\/td>\n<td>3.56<\/td>\n<td>3.39<\/td>\n<\/tr>\n<tr>\n<td>1 1\/2<\/td>\n<td>40<\/td>\n<td>48.3<\/td>\n<td>3.68<\/td>\n<td>4.05<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>50<\/td>\n<td>60.3<\/td>\n<td>3.91<\/td>\n<td>5.44<\/td>\n<\/tr>\n<tr>\n<td>2 1\/2<\/td>\n<td>65<\/td>\n<td>73.0<\/td>\n<td>5.16<\/td>\n<td>8.63<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>80<\/td>\n<td>88.9<\/td>\n<td>5.49<\/td>\n<td>11.29<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>100<\/td>\n<td>114.3<\/td>\n<td>6.02<\/td>\n<td>16.07<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>125<\/td>\n<td>141.3<\/td>\n<td>6.55<\/td>\n<td>21.77<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>150<\/td>\n<td>168.3<\/td>\n<td>7.11<\/td>\n<td>28.26<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>200<\/td>\n<td>219.1<\/td>\n<td>8.18<\/td>\n<td>42.55<\/td>\n<\/tr>\n<tr>\n<td>10<\/td>\n<td>250<\/td>\n<td>273.0<\/td>\n<td>9.27<\/td>\n<td>60.29<\/td>\n<\/tr>\n<tr>\n<td>12<\/td>\n<td>300<\/td>\n<td>323.8<\/td>\n<td>10.31<\/td>\n<td>79.70<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"tfs-small\">Dimensions to ASME B36.10M; masses are theoretical values for plain-end black pipe.<\/p>\n<div class=\"tfs-pcalc\" data-cfg=\"{&quot;type&quot;: &quot;pipe&quot;, &quot;len&quot;: 6, &quot;loc&quot;: &quot;en-US&quot;, &quot;labels&quot;: {&quot;d&quot;: &quot;Diameter (mm)&quot;, &quot;L&quot;: &quot;Length (m)&quot;, &quot;t&quot;: &quot;Thickness (mm)&quot;, &quot;B&quot;: &quot;Width (m)&quot;, &quot;OD&quot;: &quot;Outside diameter (mm)&quot;, &quot;a&quot;: &quot;Side a (mm)&quot;, &quot;b&quot;: &quot;Side b (mm)&quot;, &quot;S&quot;: &quot;Size&quot;}}\"><b class=\"tfs-pc-title\">Pipe weight calculator<\/b><\/p>\n<div class=\"tfs-pc-fields\"><\/div>\n<div class=\"tfs-pc-result\">\n<div><b class=\"tfs-pc-perm\">\u2013<\/b><span>Mass per metre (kg)<\/span><\/div>\n<div><b class=\"tfs-pc-total\">\u2013<\/b><span>Total mass (kg)<\/span><\/div>\n<\/div>\n<p class=\"tfs-pc-note\">Theoretical mass based on a density of 7850 kg\/m\u00b3; actual mass may differ slightly within the tolerance of the standard.<\/p>\n<\/div>\n<h3>Pipe weight formula<\/h3>\n<p>With the outside diameter (OD) and wall thickness (t) in millimetres, the mass per metre in kilograms is:<\/p>\n<p class=\"tfs-formula\">W = (OD \u2212 t) \u00d7 t \u00d7 0.02466<\/p>\n<p>For example, a 4 inch Schedule 40 pipe weighs (114.3 minus 6.02) \u00d7 6.02 \u00d7 0.02466, or about 16.07 kg per metre.<\/p>\n<h2 id=\"application\">Applications of steel pipe<\/h2>\n<ul>\n<li><strong>Oil, gas and petrochemicals:<\/strong> transmission lines, process piping and refinery installations.<\/li>\n<li><strong>Water and wastewater:<\/strong> transmission mains, distribution networks and pumping stations.<\/li>\n<li><strong>Building services:<\/strong> gas supply, fire protection, heating and cooling.<\/li>\n<li><strong>Power plants and industry:<\/strong> steam lines, boilers and heat exchangers.<\/li>\n<li><strong>Structures:<\/strong> columns, space frames, steel piles, scaffolding and railings.<\/li>\n<\/ul>\n<h2 id=\"storage\">Storage notes<\/h2>\n<ul>\n<li>Stack pipes on timber supports with side restraints to prevent rolling and contact with the ground.<\/li>\n<li>Protect pipe ends and threads with caps to avoid damage and keep dirt out.<\/li>\n<li>Store galvanized pipe in a dry, ventilated place to prevent white rust.<\/li>\n<\/ul>\n<figure class=\"tfs-fig\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3083\" src=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-2.webp\" alt=\"Pipes in various diameters\" width=\"1200\" height=\"800\" loading=\"lazy\" srcset=\"https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-2.webp 1200w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-2-300x200.webp 300w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-2-1024x683.webp 1024w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-2-768x512.webp 768w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-2-64x43.webp 64w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-2-108x72.webp 108w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-2-118x79.webp 118w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-2-105x70.webp 105w, https:\/\/tfstrading.com\/wp-content\/uploads\/2026\/10\/tfs-u-pipe-2-207x138.webp 207w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Bundles of steel pipe in different diameters, stacked in storage.<\/figcaption><\/figure>\n<h2 id=\"faq\">Frequently asked questions about steel pipe<\/h2>\n<details>\n<summary>What is the difference between welded and seamless pipe?<\/summary>\n<p>Welded pipe is made by bending and welding steel sheet and has a weld seam. Seamless pipe is made by piercing a hot billet, has no seam and is better suited to high pressure and temperature.<\/p>\n<\/details>\n<details>\n<summary>What does Schedule 40 mean?<\/summary>\n<p>The schedule is a number that defines the wall thickness of a pipe for each nominal size. The higher the schedule, the thicker the wall.<\/p>\n<\/details>\n<details>\n<summary>Is the nominal size the same as the outside diameter?<\/summary>\n<p>No. The nominal size is only a designation. A 1 inch pipe, for example, has an outside diameter of 33.4 mm.<\/p>\n<\/details>\n<details>\n<summary>How is the weight of a steel pipe calculated?<\/summary>\n<p>Subtract the wall thickness from the outside diameter, multiply the result by the thickness and then by 0.02466 to get the mass per metre in kilograms.<\/p>\n<\/details>\n<details>\n<summary>What is the difference between ERW and spiral pipe?<\/summary>\n<p>ERW pipe has a straight seam along its length and is common in small to medium diameters. Spiral pipe has a helical seam and is used for large diameters.<\/p>\n<\/details>\n<h2 id=\"related\">Related steel sections<\/h2>\n<p class=\"tfs-rel\"><a href=\"https:\/\/tfstrading.com\/en\/rebar\/\">Rebar<\/a><a href=\"https:\/\/tfstrading.com\/en\/i-beam\/\">I-beam<\/a><a href=\"https:\/\/tfstrading.com\/en\/sheet\/\">Sheet<\/a><a href=\"https:\/\/tfstrading.com\/en\/profile\/\">Profile<\/a><a href=\"https:\/\/tfstrading.com\/en\/angle-bar\/\">Angle bar<\/a><a href=\"https:\/\/tfstrading.com\/en\/channel\/\">Channel<\/a><\/p>\n<h2 id=\"sources\">References and standards<\/h2>\n<ul class=\"tfs-src\">\n<li>ASME B36.10M: Welded and seamless wrought steel pipe<\/li>\n<li>API 5L: Specification for line pipe<\/li>\n<li>ASTM A53\/A53M: Pipe, steel, black and hot-dipped, zinc-coated, welded and seamless<\/li>\n<li>ASTM A106\/A106M: Seamless carbon steel pipe for high-temperature service<\/li>\n<li>EN 10255: Non-alloy steel tubes suitable for welding and threading<\/li>\n<li>EN 39: Loose steel tubes for tube and coupler scaffolds<\/li>\n<\/ul>\n<\/div>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the difference between welded and seamless pipe?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Welded pipe is made by bending and welding steel sheet and has a weld seam. 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This guide covers the types of steel pipe, manufacturing methods, nominal size and schedule, the pipe dimension and weight chart, and the reference standards. 6 and 12&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-2445","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/pages\/2445","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/comments?post=2445"}],"version-history":[{"count":9,"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/pages\/2445\/revisions"}],"predecessor-version":[{"id":3238,"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/pages\/2445\/revisions\/3238"}],"wp:attachment":[{"href":"https:\/\/tfstrading.com\/en\/wp-json\/wp\/v2\/media?parent=2445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}