{"id":7806,"date":"2025-10-12T09:00:00","date_gmt":"2025-10-12T08:00:00","guid":{"rendered":"https:\/\/uplastech.com\/spiral-wound-pipe\/"},"modified":"2026-10-28T09:22:36","modified_gmt":"2026-10-28T09:22:36","slug":"spiral-wound-pipe","status":"publish","type":"post","link":"https:\/\/uplastech.com\/id\/spiral-wound-pipe\/","title":{"rendered":"Spiral Wound Pipe: Large Diameter From a Small Machine"},"content":{"rendered":"<style>\n.upl-blog{font-size:17px;line-height:1.78;color:#1f2937}\n.upl-blog p{margin:0 0 18px}\n.upl-blog h2{font-size:26px;line-height:1.3;color:#0b2b33;margin:46px 0 14px;font-weight:700;letter-spacing:-.015em}\n.upl-blog h3{font-size:19.5px;color:#0d3b47;margin:28px 0 10px;font-weight:700}\n.upl-blog ul,.upl-blog ol{margin:0 0 20px;padding-left:22px}\n.upl-blog li{margin:0 0 9px}\n.upl-blog figure{margin:0 0 34px}\n.upl-blog figure img{width:100%;height:auto;display:block;border-radius:10px}\n.upl-blog figcaption{font-size:13px;color:#6b7280;margin-top:10px;line-height:1.5}\n.upl-blog .toc{background:none;border:0;border-radius:0;padding:0;margin:0 0 34px}\n.upl-blog .toc .lwptoc{margin:0}\n.upl-blog .toc h4{margin:0 0 10px;font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:#0d5563}\n.upl-blog .toc ol{margin:0;padding-left:18px;font-size:14.5px}\n.upl-blog .toc li{margin-bottom:6px}\n.upl-blog table{width:100%;border-collapse:collapse;font-size:14.5px;margin:0 0 10px}\n.upl-blog th{background:#0d3b47;color:#fff;text-align:left;padding:11px 13px;font-weight:600;font-size:13.5px;border:0}\n.upl-blog td{padding:11px 13px;border:0;border-bottom:1px solid #e8ebed;vertical-align:top}\n.upl-blog tbody tr:nth-child(even){background:#fafbfc}\n.upl-blog .tablecap{font-size:12.5px;color:#6b7280;margin:0 0 30px}\n.upl-blog .myth{background:#fff8ef;border:1px solid #f6ddbd;border-radius:8px;padding:16px 20px;margin:0 0 26px;font-size:15.5px}\n.upl-blog .myth b{color:#a85c10}\n.upl-blog .callout{background:#f2f8f9;border-radius:8px;padding:18px 22px;margin:0 0 26px;font-size:15.5px;border-left:3px solid #14707f}\n.upl-blog .faq h3{border-top:1px solid #eceff1;padding-top:22px;margin-top:0;font-size:18px}\n.upl-blog .faq h3:first-of-type{border-top:0;padding-top:0}\n.upl-blog .cta{background:linear-gradient(135deg,#0b2b33,#0d5563);color:#fff;border-radius:12px;padding:34px;margin:48px 0 30px}\n.upl-blog .cta h2,.upl-blog .cta .cta-h{color:#fff;margin:0 0 10px;font-size:24px;font-weight:700;line-height:1.3}\n.upl-blog .cta p{color:#c9dee3;margin:0 0 20px;font-size:16px}\n.upl-blog .btn{display:inline-block;background:#e07a1f;color:#fff;text-decoration:none;font-weight:700;padding:13px 26px;border-radius:8px;font-size:15.5px}\n.upl-blog .rel{border-top:1px solid #e8ebed;margin-top:40px;padding-top:26px}\n.upl-blog .rel h4{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:#6b7280;margin:0 0 14px}\n.upl-blog .rel ul{list-style:none;padding:0;margin:0}\n.upl-blog .rel li{padding:11px 0;border-bottom:1px dashed #e8ebed}\n.upl-blog .rel a{text-decoration:none;font-weight:600;font-size:15.5px}\n@media(max-width:640px){.upl-blog h2{font-size:22px}.upl-blog table{font-size:13px}.upl-blog .cta{padding:24px}}\n\/* \u5355\u7bc7\u9875\u9690\u85cf WhatsApp \u95ee\u5019\u5361\uff0c\u53ea\u4fdd\u7559\u5706\u5f62\u6c14\u6ce1\uff0c\u907f\u514d\u906e\u6321\u4fa7\u680f\u8be2\u76d8\u63d0\u4ea4\u6309\u94ae\u3002\n   \u6ce8\u610f\uff1aClick to Chat \u7684\u70b9\u51fb\u903b\u8f91\u662f\u300c\u95ee\u5019\u5361\u5143\u7d20\u5b58\u5728\u5c31\u4e0d\u8df3\u8f6c\u300d\uff0c\u53ea\u9760 CSS \u9690\u85cf\u4f1a\u8ba9\u6c14\u6ce1\u53d8\u6210\u6b7b\u94fe\u63a5\u3002\n   Code Snippets #9\u300cUPL single post: WhatsApp bubble jumps straight to chat\u300d\u8d1f\u8d23\u628a\u8be5\u8282\u70b9\u4ece DOM \u79fb\u9664\uff0c\n   \u4e0b\u9762\u8fd9\u6761 CSS \u53ea\u662f\u79fb\u9664\u524d\u7684\u89c6\u89c9\u515c\u5e95\u3002\u5220 #9 \u524d\u5fc5\u987b\u5148\u5220\u8fd9\u6761\u89c4\u5219\u3002 *\/\nbody.single-post .ht_ctc_chat_greetings_box{display:none !important}\n<\/style>\n<div class=\"upl-blog\">\n<figure>\n<img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/uplastech.com\/wp-content\/uploads\/2026\/10\/spiral-wound-pipe.jpg\" alt=\"Profile strip width against pipe diameter and ring stiffness by number of wound layers\" width=\"1536\" height=\"909\"><figcaption>The machine stays the same size. Only the mandrel and the winding angle change.<\/figcaption><\/figure>\n<div class=\"toc\"><\/div>\n<h2 id=\"what\">What spiral wound pipe is<\/h2>\n<p>A spiral wound pipe is made by extruding a hollow profile and winding it helically onto a rotating mandrel, with adjacent turns welded together by the heat of the extrusion or by a separate hot-air or hot-plate process. The result is a continuous pipe of whatever diameter the mandrel can carry.<\/p>\n<p>The advantage is size. An extruded pipe is limited by die size, cooling length and haul-off; a wound pipe is limited only by the mandrel, which is a steel drum. Diameters of 3 metres and above are routine, and the same extrusion line that makes a 300 mm wound pipe can make a 3,000 mm one with a different mandrel and wind angle.<\/p>\n<p>The disadvantage is that the wall is a structure rather than a solid section. It has ribs, voids and a helical seam, and every one of those is a place where the pipe can fail if the process is not controlled.<\/p>\n<table>\n<thead>\n<tr>\n<th>Konstruksi<\/th>\n<th>Ring stiffness<\/th>\n<th>Typical use<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Single-wall wound profile<\/td>\n<td>SN2 \u2013 SN4<\/td>\n<td>Drainage, ventilation duct<\/td>\n<\/tr>\n<tr>\n<td>Wound profile with liner<\/td>\n<td>SN4 \u2013 SN8<\/td>\n<td>Sewer, stormwater<\/td>\n<\/tr>\n<tr>\n<td>Multi-layer wound<\/td>\n<td>SN8 \u2013 SN16<\/td>\n<td>Deep burial, traffic load<\/td>\n<\/tr>\n<tr>\n<td>Wound with concrete jacket<\/td>\n<td>SN16+<\/td>\n<td>Very deep burial, culvert<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 1 \u2014 Spiral wound pipe constructions. The liner carries the flow; the wound structure carries the load.<\/p>\n<h2 id=\"process\">The winding process<\/h2>\n<p>The profile leaves the extruder at 190 to 220 \u00b0C and is still soft when it reaches the mandrel. It is laid at an angle to the axis \u2014 the wind angle \u2014 and the mandrel rotation and the traverse speed together set that angle.<\/p>\n<p>Wind angle is the single most important setting. A shallow angle gives more material per unit length and higher stiffness but slower production; a steep angle gives faster production and less stiffness. Most lines run at 60 to 75 degrees to the axis.<\/p>\n<p>The weld between adjacent turns is the structural joint. It is made by the residual heat in the profile plus a hot-air jet or a heated shoe. If the profile has cooled too much before it reaches the mandrel, the weld is incomplete and the pipe delaminates under load.<\/p>\n<p>Cooling is by water spray on the mandrel. A large wound pipe holds a lot of heat, and a pipe that is removed from the mandrel too warm will deform under its own weight. Large diameters are often cooled on the mandrel for 20 minutes or more.<\/p>\n<div class=\"callout\">The weld is invisible in the finished pipe. A peel test on a ring cut from the start of each run is the only way to know the wind parameters are right.<\/div>\n<h2 id=\"stiffness\">Ring stiffness from structure<\/h2>\n<p>Ring stiffness in a wound pipe comes from the profile height and the number of layers, not from the wall thickness in the conventional sense. A single layer of a 25 mm high profile gives SN2 to SN4; two layers give SN4 to SN8; three or four layers reach SN16.<\/p>\n<p>The profile geometry matters as much as the count. A hollow rectangular profile with a 25 mm height and a 3 mm wall has a moment of inertia per unit width that a solid 3 mm wall cannot approach. This is the same principle as the corrugated pipe, applied to a wound structure.<\/p>\n<p>The penalty is that the voids in the profile reduce the effective area for longitudinal bending. A wound pipe is stiff in ring compression and comparatively weak in longitudinal bending, which matters during installation and in settlement.<\/p>\n<table>\n<thead>\n<tr>\n<th>Profile height<\/th>\n<th>Layers<\/th>\n<th>Ring stiffness<\/th>\n<th>Relative material<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>20 mm<\/td>\n<td>1<\/td>\n<td>SN2 \u2013 SN3<\/td>\n<td>1.0<\/td>\n<\/tr>\n<tr>\n<td>25 mm<\/td>\n<td>1<\/td>\n<td>SN3 \u2013 SN4<\/td>\n<td>1.1<\/td>\n<\/tr>\n<tr>\n<td>25 mm<\/td>\n<td>2<\/td>\n<td>SN6 \u2013 SN8<\/td>\n<td>2.0<\/td>\n<\/tr>\n<tr>\n<td>30 mm<\/td>\n<td>2<\/td>\n<td>SN8 \u2013 SN10<\/td>\n<td>2.2<\/td>\n<\/tr>\n<tr>\n<td>30 mm<\/td>\n<td>3<\/td>\n<td>SN12 \u2013 SN16<\/td>\n<td>3.1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 2 \u2014 Ring stiffness by profile height and layer count. Material is relative to the single 20 mm layer.<\/p>\n<h2 id=\"joint\">Liners and joints<\/h2>\n<p>A wound structural pipe is not watertight. The helical weld is a structural joint, not a seal, and the profile itself may have gaps. A liner is either co-wound as an inner layer or inserted afterwards as a smooth tube.<\/p>\n<p>The common liners are HDPE, PP and PVC-U. HDPE is the default for sewer because it is chemically resistant and can be fusion welded to the pipe ends. PP is used where the temperature is higher. PVC-U gives a smoother bore and better abrasion resistance.<\/p>\n<p>The joint between pipe sections is usually a bell and spigot with an elastomeric seal, or a butt-fusion weld of the liner with a mechanical connection of the structure. For sewer, the liner weld is the watertight element and the structural connection carries the load.<\/p>\n<p>Joint stiffness is the weak point. A wound pipe is stiff along its length and less stiff at a joint where the structure is interrupted. For deep burial, a coupler that continues the profile is used rather than a plain sleeve.<\/p>\n<h2 id=\"limits\">Where it wins and where it does not<\/h2>\n<p>Wound pipe wins on diameter, on short runs of large pipe, and on sites where transport of a 3 metre extruded pipe is impossible. It also wins on lead time: a mandrel change is hours, a die change is weeks.<\/p>\n<p>It loses on pressure \u2014 it has none \u2014 on longitudinal strength, and on wall thickness consistency. A wound pipe's wall varies with the wind angle and the profile tolerance in a way an extruded pipe's does not.<\/p>\n<div class=\"myth\"><b>\"A wound pipe and an extruded pipe of the same stiffness are interchangeable.\"<\/b> They are interchangeable in ring compression and not in longitudinal bending, joint behaviour or abrasion resistance. The specification has to say which matters.<\/div>\n<h2 id=\"qc\">Quality checks<\/h2>\n<table>\n<thead>\n<tr>\n<th>Check<\/th>\n<th>Metode<\/th>\n<th>Frequency<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ring stiffness<\/td>\n<td>Compression test on a ring<\/td>\n<td>Per run<\/td>\n<\/tr>\n<tr>\n<td>Weld integrity<\/td>\n<td>Peel test on a cut ring<\/td>\n<td>Start and end of run<\/td>\n<\/tr>\n<tr>\n<td>Wall \/ profile height<\/td>\n<td>Caliper or shadowgraph<\/td>\n<td>Berkelanjutan<\/td>\n<\/tr>\n<tr>\n<td>Diameter and ovality<\/td>\n<td>Tape or laser<\/td>\n<td>Per length<\/td>\n<\/tr>\n<tr>\n<td>Liner thickness<\/td>\n<td>Ultrasonic or section<\/td>\n<td>Per run<\/td>\n<\/tr>\n<tr>\n<td>Joint seal compression<\/td>\n<td>Gauge on sample joint<\/td>\n<td>Per batch<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p class=\"tablecap\">Table 3 \u2014 Spiral wound pipe quality checks. The peel test is the one that catches a wind parameter that has drifted.<\/p>\n<div class=\"faq\">\n<h3>What is the maximum diameter of spiral wound pipe?<\/h3>\n<p>Limited by the mandrel, not by the process. Mandrels up to 3 to 4 metres are in use, and larger diameters are made with segmented mandrels or on-site winding machines.<\/p>\n<h3>How is spiral wound pipe joined?<\/h3>\n<p>Usually a bell and spigot with an elastomeric seal, plus a fusion weld of the liner. For deep burial, a structural coupler that continues the profile is used.<\/p>\n<h3>Is spiral wound pipe as stiff as solid wall pipe?<\/h3>\n<p>In ring compression, yes, at a fraction of the material. In longitudinal bending it is weaker, because the profile voids reduce the effective section.<\/p>\n<h3>What wind angle should be used?<\/h3>\n<p>60 to 75 degrees to the axis for most drainage and sewer pipe. A shallower angle gives more material per length and higher stiffness at lower output.<\/p>\n<h3>Can spiral wound pipe be used for pressure?<\/h3>\n<p>No. It has no hoop strength for internal pressure. It is a gravity product.<\/p>\n<h3>Why does a wound pipe delaminate?<\/h3>\n<p>The profile cooled before it reached the mandrel, so the helical weld never formed. Check the die-to-mandrel distance, the melt temperature and the hot-air assist.<\/p>\n<\/div>\n<div class=\"cta\">\n<p class=\"cta-h\">Need large diameter pipe without a large extrusion line?<\/p>\n<p>Tell us the diameter, the stiffness class and the liner requirement. We will tell you the profile and the layer count that meet it.<\/p>\n<p><a class=\"btn\" href=\"https:\/\/uplastech.com\/id\/ekstrusi-pipa-dan-tabung\/\">Talk to a pipe extrusion engineer<\/a>\n<\/div>\n<div class=\"rel\">\n<h4>Continue reading<\/h4>\n<ul>\n<li><a href=\"https:\/\/uplastech.com\/id\/double-wall-corrugated-pipe\/\">Double-Wall Corrugated Pipe<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/id\/hdpe-pipe-extrusion\/\">HDPE Pipe Extrusion: Sag, Ovality and Cooling<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/id\/mencapai-dimensi-produk-yang-konsisten-dalam-ekstrusi\/\">Consistent Product Dimensions in Extrusion<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/id\/multilayer-pipe-coextrusion\/\">Multilayer Pipe Coextrusion<\/a><\/li>\n<li><a href=\"https:\/\/uplastech.com\/id\/profile-calibration-cooling\/\">Profile Calibration and Cooling<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>A 2.5 metre pipe cannot be extruded on a 2.5 metre line. Winding a profile onto a mandrel makes it possible, and the stiffness comes from the structure rather than the wall.<\/p>","protected":false},"author":1,"featured_media":7805,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"Spiral Wound Pipe: Winding Process, Profile and Ring Stiffne","_seopress_titles_desc":"Spiral wound pipe production: profile extrusion and winding, mandrel diameter, ring stiffness by layer count, liner options, joints and the defects that appear","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"17","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","footnotes":""},"categories":[17],"tags":[],"class_list":["post-7806","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-plastic-extrusion-process"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/uplastech.com\/id\/wp-json\/wp\/v2\/posts\/7806","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/uplastech.com\/id\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/uplastech.com\/id\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/uplastech.com\/id\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/uplastech.com\/id\/wp-json\/wp\/v2\/comments?post=7806"}],"version-history":[{"count":1,"href":"https:\/\/uplastech.com\/id\/wp-json\/wp\/v2\/posts\/7806\/revisions"}],"predecessor-version":[{"id":7867,"href":"https:\/\/uplastech.com\/id\/wp-json\/wp\/v2\/posts\/7806\/revisions\/7867"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/uplastech.com\/id\/wp-json\/wp\/v2\/media\/7805"}],"wp:attachment":[{"href":"https:\/\/uplastech.com\/id\/wp-json\/wp\/v2\/media?parent=7806"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/uplastech.com\/id\/wp-json\/wp\/v2\/categories?post=7806"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/uplastech.com\/id\/wp-json\/wp\/v2\/tags?post=7806"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}