İçerik tablosu
- 1. Urban Flood Control and Deep Tunnel Drainage: The Pipe Demand Background
- 2. Structure and Principle of the HDPE Hollow Wall Winding Pipe
- 3. Üretim Hattı Equipment Composition and Commissioning Points
- 4. Material System and Compounding for Large-Diameter HDPE Pipes
- 5. Standards and Acceptance Specification
- 6. Engineering Application and Buried Installation
- 7. Special Challenges of Super-Large Diameter and Countermeasures
- 8. Faygo Real Machine Modules for Hollow Wall Winding Pipe Production
- 9. Requirement to Model Selection Recommendation
- 10. Common Quality Defects and Countermeasures
- 11. Service Support and How to Start Your Project
- 12. Sıkça Sorulan Sorular
1. Urban Flood Control and Deep Tunnel Drainage: The Pipe Demand Background
Extreme rainfall events are becoming more frequent and more intense across densely populated metropolitan regions, and the resulting urban flooding has turned municipal drainage from a background utility into a front-line infrastructure priority. When a storm drops two hundred millimeters of rain inside a few hours, conventional gravity sewers sized for a ten-year return period simply cannot move the volume, and streets, subways, and basements fill with water. The engineering response that planners now favor is a two-tier system: a normal near-surface drainage network for routine flow, plus a deep storage and transfer tunnel bored far below the city to absorb the peak and release it slowly after the event. A super large HDPE hollow wall winding pipe production machine exists to manufacture the pipe that makes this second tier physically possible.
The deep tunnel concept changes every design parameter of the pipe. Instead of placing a pipe two or three meters below the road, engineers now thread a tunnel thirty to sixty meters down, where geology is stable and surface disruption is minimal. At that depth the pipe must carry enormous static earth and water loads, survive long-term external pressure without buckling, resist aggressive sewage chemistry, and remain serviceable for half a century with essentially no access for repair. The diameter requirement also expands dramatically. Where a typical municipal trunk line might be DN600, a deep drainage main frequently runs from DN800 up to DN3000 and beyond. These are not conventional extruded solid-wall pipes; they are structured-wall pipes where the wall is engineered as a hollow cavity to maximize stiffness per unit of material.
Long-term external stability is the decisive property. A pipe buried at forty meters depth carries a soil column plus groundwater head that can exceed three hundred kilopascals of sustained external pressure. A solid-wall pipe sized to resist that load would need a wall so thick that material cost and weight become impractical. The hollow wall winding concept solves this by placing the structural material where it contributes most to the section’s second moment of area, achieving high ring stiffness at a fraction of the mass. This is why hollow wall winding technology, rather than solid-wall extrusion, is the natural choice for super-large flood-control and deep-tunnel pipe.
Corrosion resistance is the second decisive property. Drainage and storage tunnel water is not clean. It ranges from mildly alkaline to acidic, carries suspended grit, and in combined systems can swing between pH 2 and pH 12 depending on industrial discharge and rainfall dilution. A steel or concrete pipe faces progressive degradation in that environment; an HDPE structured-wall pipe is chemically inert across the full pH range and does not support microbiological corrosion. The design life target of fifty years is therefore realistic rather than optimistic.
Installation method adds a final constraint. Deep tunnels are almost always installed by trenchless methods such as pipe jacking or segmental lining, while shallower trunk sewers may be laid in open cut. Both methods favor pipe that is light enough to handle, stiff enough to be pushed or pulled through ground without ovalizing, and jointed with a seal that survives ground movement. Hollow wall winding pipe meets all three because the low mass comes from the hollow structure, the high stiffness comes from the engineered wall, and the joints are made by electrofusion or heat-shrink collars that create a continuous, flexible, watertight connection.
Faygo, a Wanplas factory with 22 years of dedicated experience in plastic pipe and profile extrusion, builds the production machinery that manufactures these pipes. Operating three specialized factories and holding 13 national patents, Faygo supplies the complete extrusion and winding line that turns HDPE resin into DN800 to DN3000 structured-wall pipe rated for the most demanding municipal flood-control duties.
2. Structure and Principle of the HDPE Hollow Wall Winding Pipe
The hollow wall winding pipe is a structured-wall pipe in which the structural load is carried by a hollow profile that is wound helically around the pipe axis, rather than by a uniform solid wall. Understanding how this structure compares with alternatives is the foundation for specifying the right production machine.
2.1 Comparison With Other Pipe Structures
Four structured-wall concepts dominate the large-diameter drainage market: the solid-wall pipe, the double-wall corrugated pipe, the steel-reinforced polyethylene pipe, and the hollow wall winding pipe. Each trades material efficiency, maximum achievable diameter, joint method, and cost differently. The table below compares them on the dimensions that matter for flood-control and deep-tunnel service.
| Structure Type | Ring Stiffness Efficiency (SN per unit mass) | Maximum Diameter | Typical Joint Method | Relative Cost Level |
|---|---|---|---|---|
| Solid-wall PE pipe | Low | DN1200 typical, limited beyond | Butt fusion / electrofusion | Orta |
| Double-wall corrugated pipe | Orta | DN300 to DN1200 | Integrated socket / rubber ring | Orta |
| Steel-reinforced PE pipe | High | DN800 to DN2600 | Electrofusion / collar | High |
| Hollow wall winding pipe | Very High | DN800 to DN3000 and above | Electrofusion tape / heat-shrink / steel clamp | Medium to High |
The ring stiffness efficiency metric shown in the first column is the ratio of achieved ring stiffness to the mass of polymer used. Hollow wall winding pipe leads this metric because its cavity profile places material far from the neutral axis, where it most increases the second moment of area. That is precisely why it can reach DN3000 with practical wall mass, while a solid-wall pipe of equal stiffness would be prohibitively heavy.
2.2 The Winding Formation Principle
The defining process of this pipe is helical winding on a rotating mandrel. Molten HDPE is formed into a shaped hollow profile strip, sometimes called a profile or structural strip, in a dedicated profile die. This strip has a precise cross-section with one or more internal cavities. The strip is then delivered to a rotating mandrel, a large-diameter cylindrical forming drum, where it is laid down in a continuous helix. As each new turn of the strip is placed against the previous turn, the adjacent strip edges are fused together by a hot-melt welding unit so that the helix becomes a single monolithic wall. The cavities created between successive turns form the hollow structural wall.
Two layers are typically built. An inner liner, often a flat or lightly profiled strip, forms the smooth interior flow surface. Over or around this liner, the hollow structural profile is wound to create the load-bearing wall. Some designs add an outer protective strip or capping strip that seals the cavity edges and gives the outside a finished appearance. The key physical principle is that the strip is plastic and hot at the moment of contact, so the welding pressure and temperature cause the two strip edges to coalesce into one homogeneous wall with no weak seam.
Because the structure is built by winding rather than by extruding a complete pipe through a die, the achievable diameter is limited only by the size of the mandrel and the floor space of the line, not by die-tooling limits. This is the core reason hollow wall winding technology reaches DN3000 where extruded solid-wall tooling cannot.
2.3 Ring Stiffness Grades and Cavity Geometry
Yüzey sertliği is the resistance of a pipe to deformation under uniform external load, expressed in kilonewtons per square meter (kN/m²). For structured-wall pipes the standard grades are SN2, SN4, SN8, SN12.5, and SN16. A higher number means a stiffer pipe that deflects less under the same buried load, allowing it to be used at greater depth or under heavier fill.
Yüzey sertliği is controlled in a winding line by three geometric levers. The first is the height of the structural wall: a taller profile places material farther from the neutral axis and raises stiffness. The second is the cavity shape. Rectangular cavities are simple to tool and give predictable stiffness; trapezoidal cavities improve bridging between turns and resist local collapse; circular cavities offer the best hoop stress distribution but are harder to seal at the weld. The third lever is the number of cavities and the strip thickness. The table below maps typical cavity choices to stiffness grades.
| Ring Stiffness Grade | Typical Wall Height Range | Preferred Cavity Shape | Typical Buried Depth (compacted backfill) |
|---|---|---|---|
| SN2 | Low | Rectangular | Shallow, low cover |
| SN4 | Low to medium | Rectangular / trapezoidal | Shallow to medium |
| SN8 | Orta | Trapezoidal | Medium depth trunk sewer |
| SN12.5 | Medium to high | Trapezoidal / circular | Deep burial, heavy traffic |
| SN16, | High | Circular / composite cavity | Deep tunnel, high external load |
2.4 The Engineering Relation Between Inertia and Ring Stiffness
Yüzey sertliği is not an arbitrary label; it is rooted in the structural mechanics of a ring under radial load. In simplified form, the ring stiffness of a pipe relates to the product of the material’s flexural modulus and the second moment of area of the wall cross-section, divided by the cube of the diameter. Expressed in words rather than symbols, the stiffness grows in direct proportion to the material modulus and to the inertia of the wall, and it falls rapidly as the cube of the diameter increases. This is why diameter is such a dominant factor: doubling the diameter reduces the natural ring stiffness by roughly a factor of eight, unless the wall’s second moment of area is increased to compensate.
The hollow wall design is essentially an optimization of that second moment of area. By moving polymer into cavity walls positioned far from the pipe centerline, the winding structure achieves a much larger inertia for the same mass than a solid wall could. The production machine’s job is to reproduce that optimized geometry turn after turn, with consistent cavity shape and a weld strong enough that the structure behaves as one continuous ring. If the weld is weak, the section loses its continuity and the effective inertia collapses, so the welding unit is as important to final ring stiffness as the profile die itself.
3. Üretim Hattı Equipment Composition and Commissioning Points
A super large hollow wall winding pipe production line is a sequence of synchronized stations, each with its own parameters and its own failure modes. The following sections walk through the main line segment by segment, giving the representative parameters and the commissioning points an engineer should watch.
3.1 Main Extruder
The main extruder melts and pumps the HDPE that forms the structural profile. For large-diameter hollow wall pipe, a single-screw extruder with a screw diameter from φ90 to φ150 mm is typical, with an L/D ratio of 33 to 36. The screw is an HDPE-specific barrier screw fitted with a mixing head that ensures uniform melt temperature and pressure before the material enters the profile die. Throughput scales with screw size: a φ120 mm machine delivers roughly 800 to 1500 kg/h, while a φ150 mm machine reaches up to 2000 kg/h.
Commissioning points: set the barrel temperature profile so the rear zones stay cool enough to build feed pressure and the front zones reach a uniform melt temperature around 200 to 220 degrees Celsius. Verify melt pressure stability; pressure swings translate directly into profile thickness variation. Check the barrier section is clean and the mixing head is free of carbon buildup before the first run.
3.2 Auxiliary Extruder
A secondary, smaller extruder supplies the inner liner layer and the hot-melt welding bead. Its output is a thinner, lower-viscosity stream that forms the smooth interior surface and the thin film that the welding unit fuses between adjacent profile turns. Using a separate extruder for the liner lets the line run a recycled or cost-optimized compound in the structural layer while keeping a clean virgin surface in contact with the flow.
Commissioning points: match the auxiliary extruder melt temperature to the main stream so the two bond without a cold interface. Confirm the liner thickness is uniform across the mandrel circumference; uneven liner causes interior surface defects that are hard to correct later.
3.3 Profile Die
The profile die shapes the molten HDPE into the hollow cavity strip. Its internal flow channel must be balanced so that every cavity of the profile fills completely and at equal pressure, otherwise one cavity walls is thin and the others thick. The die lips are adjustable to fine-tune the strip width and the cavity geometry after warm-up.
Commissioning points: after a full barrel warm-up, run a short scrap strip and measure the cavity dimensions against the drawing. Adjust the die lip bolts symmetrically. Confirm the strip exits straight without twist, because a twisted strip will not seat correctly on the mandrel.
3.4 Vacuum Sizing and Cooling of the Profile
Before the strip reaches the mandrel, it passes through a vacuum sizing and cooling section that locks its dimensions. The target dimensional stability for the profile is within plus or minus 0.2 mm. Tight control here is what makes the final pipe meet wall-height and cavity tolerances.
Commissioning points: tune the vacuum level and the cooling water temperature together. Too much vacuum distorts the soft profile; too little lets it relax out of tolerance. Log the strip cross-section at line start, after one hour, and after the barrel reaches thermal steady state.
3.5 Rotating Winding Mandrel
Sarma mandreli, hattın kalbidir. Çapı, borunun iç çapını belirleyen büyük çaplı dönen bir silindirdir. Bu uygulamada mandrel, DN800 ila DN3000 arasında değişen çaplara sahiptir ve 0,5 ila 5 rpm'de yavaşça döner. Mandrel dönüşüm hızı, şerit besleme hızı ve kaynak vagonu hareketi arasındaki uyumlama kritik önem taşır: eğer mandrel, şerit teslimatına göre çok hızlı dönerse, pitch genişler ve kaynak örtüşmesi daralır.
Commissioning points: verify the mandrel surface treatment gives easy demolding and that the variable-diameter mechanism holds concentricity across its full adjustment range. Check the rotation encoder against the carriage encoder so the pitch is consistent over the full pipe length. Inspect the surface for scoring that would mark the liner.
3.6 Winding Carriage and Pitch Control
The winding carriage carries the profile die and lays the strip onto the mandrel at a controlled pitch. The pitch must match the strip width so that each turn overlaps the previous turn by a defined amount. The overlap, or lap, is what the welding unit subsequently fuses; too little lap leaves a weak seam, too much lap wastes material and builds a bulged wall.
Kurulum noktaları: şerit genişliğinden hedef lapı çıkarın. Bir kalibrasyon bobini çalıştırın ve gerçek lapı ölçmek için bir kesit kesin. Borunun çevresinde lapı değiştirmekten kaçınmak için, borunun çevresinde lapı sabit tutun.
3.7 Hot-Melt Welding Unit
As each strip turn is placed, the hot-melt welding unit fuses its edge to the preceding turn. The fusion temperature is typically 210 to 240 degrees Celsius, applied through a heated shoe or wheel with controlled pressure. The weld must reach at least 90 percent of the parent material strength so the wall behaves as one continuous ring.
Commissioning points: use an infrared pyrometer to verify the actual weld-zone temperature, not just the setpoint. Set the pressure wheel force so the melt squeezes into the joint without squeezing the cavity shut. Pull-test welded sample sections; a weld below 90 percent of parent strength is a line-stop condition.
3.8 Inner and Outer Shaping Rolls and Cooling
Sarma sonrası, şekillendirme ruloları, polimerin soğuması ve geometrinin belirlenmesini sağlar. İç ve dış yüzeyleri, kalın duvarın kalınlığına göre, doğru konturuna basar. İç veya dış hava veya su soğutması, borunun kalınlığına göre sabitlenir.
Kurulum noktaları: şekillendirme ruloları, mandrel merkezine hizalandırılır. Ruloların çok sert ayarlanması, kalıcı bir iz bırakır. Soğutma, borunun sıcaklık geçişi sırasında deformasyonunu önlemek için izlenir.
3.9 Fixed-Length Cutting
Büyük çaplı bir gezegenli veya hareketli kesici, boruyu istenen uzunlukta keser. DN2000 ve üzerindeki boru duvarı kalındır ve kesim, dik bir daire izlemelidir; kabul edilen hedef, kesimin bir derece içinde dik olmasıdır.
Kurulum noktaları: kesici, borunun dönüşümünü izler, böylece bıçağı, gerçek bir daire izler. Her çap değişikliğinde ilk boruda, kesim yüzeyini bir cetvel ile kontrol edin.
3.10 Demolding, Ejection, and Socket Forming
Soğutulduktan sonra, boru mandrelden çıkarılır ve işleme geçilir. Sonlar birleştirme için hazırlanır. Bu boru için karşılaştırılan bağlantı yöntemleri elektrofüzyon bantı, ısı sıkma yaka ve çelik klemens bağlantısıdır. Elektrofüzyon bantı, soket arayüzünü eritmek için bir ısıtıcı kablosu içerir; ısı sıkma yaka, bir kapalı yuvayı sağlar; çelik klemens bağlantısı, hızlı montaj için bir mekanik bant kullanır, özellikle yeraltı sürücülerinde yararlıdır.
Kurulum noktaları: bağlantı yuvasının boyutlarını, birleşim spesifikasyonuna göre kontrol edin, çünkü gevşek veya fazla büyük bir bağlantı, en yaygın alan hatasıdır. Tesisat yönteminin, açık kazık veya kazma ile uyumlu olup olmadığını kontrol edin.
3.11 On-Line Inspection
Hatt, duvar kalınlığı, dış çap, ovalite ve birleşim bölgesi sıcaklığını gerçek zamanlı olarak izler. Kızılötesi kameralar, birleşim sıcaklığını izler, böylece borunun gömülmeden önce soğuk bir birleşim yakalanır. Kalınlık ve çap ölçerleri, kontrol sistemine veri gönderir, böylece sapma, atık olarak kabul edilmeden önce düzeltilir.
Kurulum noktaları: her ölçü aletini, vardiya başında bir ana örnekle kalibre edin. Operatörün tepki vermesi için olanak sağlayan, kabul edilen sınırlardan daha sıkı alarm limitleri ayarlayın.
4. Material System and Compounding for Large-Diameter HDPE Pipes
The performance of a hollow wall winding pipe begins with the resin. For this duty the standard material grades are HDPE PE80 and HDPE PE100. PE100 offers higher stress-crack resistance and allows thinner, lighter structures for the same pressure or stiffness class, which is why it is preferred for the larger diameters. The key material parameters are melt flow rate, density, oxidation resistance, and carbon black content.
| Property | PE80 Typical | PE100 Typical | Test Condition / Note |
|---|---|---|---|
| Melt flow rate (MFR) | 0.2 to 0.5 g/10min | 0.2 to 0.5 g/10min | 190 degrees C, 5 kg load |
| Density | 0.950 to 0.960 g/cm³ | 0.950 to 0.960 g/cm³ | ISO 1183 method |
| Oksidasyon indüksiyon süresi (OIT) | Not less than 20 min | Not less than 20 min | At 200 degrees C |
| Carbon black content | 2.0 to 2.5 percent | 2.0 to 2.5 percent | For weather resistance |
| Carbon black dispersion | Grade 1 to 3 | Grade 1 to 3 | Microscopic rating |
The antioxidant package is what delivers the fifty-year life. The oxidation induction time, measured at 200 degrees C, must stay above twenty minutes; a lower value signals insufficient stabilizer and predicts premature brittlement in the ground. Carbon black at 2.0 to 2.5 percent protects the polymer from ultraviolet degradation during above-ground storage and handling, and its dispersion grade matters as much as the quantity because poorly dispersed agglomerates become crack-initiation points.
Recycled content is permitted but must be placed carefully. The structural layer of a hollow wall pipe can incorporate 20 to 30 percent of properly cleaned regrind without a major loss of ring stiffness, because the structural duty is dominated by geometry rather than by absolute resin strength. The inner liner, however, should use full virgin material so the flow surface is smooth, clean, and free of contaminants that could harbor bacteria or leach odor. This split approach is the most cost-effective way to meet both performance and sustainability targets.
Compounding discipline is the practical lesson. Regrind must be dry, free of foreign polymer, and metered consistently; a fluctuating regrind ratio changes melt behavior and shows up as wall-thickness variation at the die. Faygo lines integrate gravimetric or loss-in-weight feeding so the regrind percentage is held constant pipe after pipe.
5. Standards and Acceptance Specification
Large-diameter structured-wall drainage pipe is governed by a stack of national and international standards. In China the governing product standard is GB/T 19472.2 for HDPE winding structured-wall pipes. Internationally, ISO 21138, EN 13476, and ASTM F894 define equivalent structured-wall pipe requirements. The performance tests referenced across these standards include ring stiffness per ISO 9969, impact resistance per ISO 3127, creep ratio per ISO 9967, oven test for dimensional stability, weld peel test, and water or air tightness test.
Acceptance is not a single number but a set of coordinated limits. The following table lists the principal acceptance items and their reference targets for a flood-control grade pipe.
| Kabul Edilmesi Konusu | Reference Standard | Typical Acceptance Limit |
|---|---|---|
| Yüzey sertliği | ISO 9969 | Meets declared SN grade (SN8, SN12.5 or SN16) |
| Impact resistance | ISO 3127 | No crack at specified drop energy, 0 degrees C |
| Creep ratio | ISO 9967 | Not more than 4.0 (long-term load) |
| Oven test | Relevant product standard | No delamination, wall remains bonded |
| Weld peel strength | Internal method per standard | Not less than 90 percent of parent material |
| Water tightness | Closed water / closed air test | No leakage at test pressure |
| Ovality after demold | Internal control | Within specified tolerance for diameter |
The closed water or closed air test is the field-level proof that joints and wall are continuous. For deep-tunnel service, specifying SN12.5 or SN16 plus a verified weld strength is the difference between a pipe that survives forty meters of cover and one that ovalizes and fails. Faygo configures each line so that these acceptance items can be measured on the production floor, not only in a remote laboratory.
6. Engineering Application and Buried Installation
The hollow wall winding pipe serves a wide range of municipal and industrial duties: deep tunnel drainage mains, stormwater storage tank connections, municipal rain and sewage separation networks, pump station inlet and outlet lines, river channel regulation works, sponge-city infiltration and drainage systems, and industrial wastewater outfalls. The common thread is large flow volume, aggressive chemistry, and the need for a long, maintenance-free life.
Buried performance depends on the interaction between pipe stiffness, burial depth, trench width, and backfill quality. A stiffer pipe tolerates more cover and heavier traffic; a well-compacted, correctly graded backfill spreads the load so the pipe sees closer to the ideal uniform pressure. The following table gives a planning-level mapping of service condition to recommended ring stiffness grade and backfill requirement. These are starting points; a qualified engineer must confirm against local soil and traffic data.
| Service Condition | Recommended SN Grade | Burial Depth | Backfill Requirement |
|---|---|---|---|
| Shallow stormwater, light cover | SN4 to SN8 | 1 to 3 m | Graded, compacted to 90 percent |
| Municipal trunk sewer | SN8 | 3 to 6 m | Graded, compacted to 95 percent |
| Deep trunk, heavy traffic | SN12.5 | 6 to 12 m | Controlled granular, 95 percent minimum |
| Deep drainage tunnel (30 to 60 m) | SN16, | 30 to 60 m | Engineered placement, monitored compaction |
| Industrial wastewater outfall | SN8 to SN12.5 | 2 to 8 m | Chemically inert backfill where required |
Trench width and backfill particle size also matter. A narrow trench concentrates load on the pipe crown, while an overly wide trench increases earth load. Backfill particle size should be free of sharp rocks that could puncture the wall, and the compaction level should reach at least 95 percent in the critical zone around the pipe. The pipe’s flexibility is an advantage here: a correctly installed flexible pipe deflects slightly and engages the surrounding soil in shared load carrying, which is exactly the behavior the ring stiffness grade is designed to support.
7. Special Challenges of Super-Large Diameter and Countermeasures
Scaling a winding line from DN800 to DN3000 introduces problems that do not exist at smaller sizes. Each must be anticipated in the machine design and in the commissioning plan.
Mandrel deflection and concentricity. A mandrel thirty meters long and three meters in diameter is a large rotating mass. Under its own weight and the winding load it can deflect, producing a pipe that is not truly round. Countermeasure: a stiffened mandrel structure with intermediate support, precision bearing alignment, and a variable-diameter mechanism that is verified for concentricity across its full range.
Uneven cooling shrinkage causing ovality. A thick wound wall cools from the outside in; the outer surface solidifies first and can pull the section out of round as the inner material shrinks. Countermeasure: controlled, zoned cooling with internal temperature management and shaping rolls that hold geometry until set, plus an ovality check before demolding.
Weld quality control at large diameter. The weld seam is longer and the heat history is more variable on a big pipe, so the risk of a cold or weak weld rises with diameter. Countermeasure: infrared weld-temperature monitoring on every turn, automatic rejection of out-of-range seams, and periodic peel testing built into the production routine.
Long-distance transport. A DN2000 or larger pipe is too large to ship as a single long piece, so it is produced in shorter segments and joined on site. Countermeasure: design the line for clean, standardized socket ends and supply matching electrofusion or clamp jointing systems so field assembly is repeatable.
Hoisting and lowering. A large structured-wall pipe, though light for its diameter, still demands careful slinging to avoid point loads that dent the wall. Countermeasure: supply dedicated lifting bands and handling procedure documentation with each line, and engineer the wall to tolerate the specified lift points.
Single-piece weight and production节拍. As diameter grows, each meter of pipe weighs more and the winding cycle lengthens, so line throughput in meters per day falls even when extruder output is constant. Countermeasure: balance the extruder size, mandrel speed, and strip width so the bottle neck is managed, and select the configuration that matches the target annual output rather than the maximum possible diameter.
8. Faygo Real Machine Modules for Hollow Wall Winding Pipe Production
Faygo, a Wanplas factory, builds the complete machinery to manufacture these pipes. The two modules below are drawn from Faygo’s pipe extrusion product family, which covers PE, PVC, and PP pipe from 12 mm up to 575 mm in the standard series and extends to super-large diameters through the hollow wall winding configuration. Both modules are CE and ISO certified and are delivered after 72 saat süren çalışma testiing.
8.1 Faygo Large-Diameter HDPE Hollow Wall Winding Boru Ekstrüzyon Hattı
This module is the core machine for DN800 to DN3000 hollow wall winding pipe. It pairs a large single-screw main extruder with a variable-diameter rotating mandrel and a synchronized hot-melt welding carriage. It is the configuration used for deep-tunnel drainage mains and large municipal storm trunks.
| Specification | Faygo Winding Line (Standard Large-Diameter Config) |
|---|---|
| Applicable pipe diameter (DN) | DN800 to DN2000, expandable to DN3000 |
| Achievable ring stiffness grade | SN2 / SN4 / SN8 / SN12.5 / SN16 |
| Main extruder | Single-screw φ120 mm, L/D 33, HDPE barrier screw with mixing head |
| Throughput | 800 to 1500 kg/h |
| Auxiliary extruder | Single-screw φ65 mm for liner and weld bead |
| Mandrel rotation speed | 0.5 to 4 rpm, variable-diameter DN800 to DN3000 |
| Installed power | Approx. 210 kW |
| Line length and footprint | Approx. 32 m by 6 m |
| Control system | PLC with HMI, recipe management, remote monitoring |
8.2 Faygo HDPE Boru Ekstrüzyon Hattı (Municipal Water and Drainage Series)
This module is Faygo’s established boru ekstrüzyon hattı, covering the medium-diameter range for water supply, drainage, gas, communication, and agricultural irrigation duties. It is the complementary machine when a project needs both super-large winding pipe for the trunk and conventional HDPE pipe for laterals and connections. The core equipment series handles 12 mm to 575 mm diameters in PE, PVC, and PP with wall thickness up to 6.5 mm.
| Specification | Faygo HDPE Boru Ekstrüzyon Hattı (Medium-Diameter Series) |
|---|---|
| Applicable pipe diameter (DN) | DN110 to DN575 (solid-wall and structured medium diameter) |
| Achievable ring stiffness grade | SN4 / SN8 / SN12.5 / SN16 (yapılandırılmış yapılar) |
| Main extruder | Single-screw φ90 to φ120 mm, L/D 33 to 36, HDPE barrier screw |
| Throughput | 500 to 1200 kg/h |
| Materials | PE / PVC / PP, wall thickness up to 6.5 mm |
| Line speed control | Closed-loop haul-off synchronized with extruder |
| Installed power | Approx. 160 kW |
| Line length and footprint | Approx. 28 m by 4 m |
| Control system | PLC with HMI, recipe management, remote monitoring |
Both modules share Faygo’s intelligent control platform, which lets the operator set parameters freely and adjust them in real time, and both use internationally renowned brand electrical components for reliability. When a project combines a deep-tunnel trunk with a distribution network, Wanplas can supply the matched pairing of the winding line and the medium-diameter line from one engineering source.
9. Requirement to Model Selection Recommendation
Doğru yapı seçimi, üç değişkenden başlar: boru çapı aralığı, gereken halk çapraz sertlik derecesi ve hedeflenen yıllık üretim. Aşağıdaki tablo, yaygın projelerin Faygo yapısına uygun önerilen yapıyı gösterir.
| Çap Aralığı | Ring Stiffness Requirement | Target Annual Output | Recommended Faygo Configuration |
|---|---|---|---|
| DN800 to DN1200 | SN8 | Up to 30,000 m/year | Winding line, φ120 mm main extruder |
| DN1200 to DN2000 | SN12.5 | 30,000 to 50,000 m/year | Winding line, φ150 mm main extruder |
| DN2000 to DN3000 | SN16, | 20,000 m/year and above | Winding line, heavy mandrel, φ150 mm plus auxiliary |
| DN110 to DN575 | SN8 to SN16 | 50,000 m/year and above | HDPE boru ekstrüzyon hattı, medium-diameter series |
| Mixed trunk and laterals | SN8 to SN16 | Project-dependent | Winding line plus medium-diameter line from Wanplas |
The selection logic is straightforward. Match the extruder size to the required throughput, match the mandrel range to the diameter, and match the wall-tooling cavity to the stiffness grade. Over-specifying wastes capital; under-specifying forces the line to run beyond its design pace and degrades weld quality. Faygo engineers review the project’s diameter mix and output target before finalizing the configuration so the delivered line sits at the right point on this table.
10. Common Quality Defects and Countermeasures
Even a well-designed line produces defects if parameters drift. The table below lists the typical failures in hollow wall winding pipe production and the corrective action for each.
| Hata | Likely Cause | Countermeasure |
|---|---|---|
| Weld virtual weld or cracking | Weld temperature below range, insufficient pressure | Raise weld zone to 210 to 240 degrees C, increase pressure wheel force, verify with peel test |
| Yüzey sertliği below grade | Wrong cavity geometry, thin wall, weak weld | Profili dieyi yeniden kalibre edin, duvar yüksekliğini artırın, kaynakların kesintisizliğini onaylayın |
| Ovality exceeds limit | Uneven cooling, mandrel deflection | Balance zoned cooling, check mandrel support and alignment |
| İç duvar çökmesi | Liner under-extruded or vacuum loss | Raise auxiliary extruder output, restore vacuum sizing |
| Cavity deformation | Profile die imbalance, over-pressure at die lip | Rebalance flow channel, adjust die lip symmetrically |
| Uneven wall thickness | Melt pressure swing, unstable screw feed | Stabilize barrel temperature, check barrier screw and feeding |
| Surface weld line mark | Poor fusion at strip edge, contamination | Clean strip edge, optimize weld temperature and lap |
| Creep exceeds limit | Material below grade, excessive regrind | Use certified PE100, reduce regrind in structural layer |
Most of these defects trace back to three root causes: unstable melt, mis-set weld, and uneven cooling. The on-line inspection package described earlier exists to catch the first two before the pipe leaves the mandrel, which is far cheaper than rejecting a finished length.
11. Service Support and How to Start Your Project
Büyük bir sarma hattını satın almak, uzun bir üretim ilişkisinin başlangıcıdır ve Wanplas fabrikası olan Faygo, bu gerçeğe dayanan bir destek yapısı oluşturur. Her hat, sevkiyat öncesinde 72 saat süren sürekli çalışma testinden geçer, böylece müşteri, işlemin hızını kanıtlamış bir makine alır. Kurulum ve devreye alma, Faygo mühendisleri tarafından yapılır ve makine, müşterinin özel boru programına ayarlanır ve yerel ekibe çalışma ve bakım konusunda eğitim verilir.
The spare parts policy follows the Wanplas group commitment: USD 500 free parts every year, plus warranty replacement for damaged parts within the warranty period. Remote operation and maintenance support lets Faygo engineers read the PLC data and diagnose issues without waiting for a site visit, which keeps downtime short. Training covers not only machine operation but also the process knowledge needed to hold ring stiffness and weld quality across diameter changes.
Faygo also offers factory consulting services that extend beyond the machine itself: water and electricity design, 3D workshop layout, worker configuration and training, and support for new factory construction or capacity expansion. The open-factory policy welcomes customers to visit the Zhangjiagang facility, see the 26,650 square meter FAYGOPLAST plant, and witness a line running before placing an order.
Başlamak için, projelerin boru çapı aralığını, gereken halkası sertlik derecesini, hedef yıllık üretimi ve kurulum yöntemini gönderin. Faygo, boruyu kabul edilebilir spesifikasyonlara uygun olup olmadığını doğrulamak için uyarlanmış bir yapı ve bir örnek deneme çalışması hazırlayacaktır.
12. Sıkça Sorulan Sorular
What diameter can a hollow wall winding pipe machine produce?
A properly configured winding line covers from roughly DN800 up to DN3000 and beyond. The upper limit is set by the mandrel size and floor space rather than by die tooling, which is why winding technology reaches diameters that solid-wall extrusion cannot. Faygo’s large-diameter module is specified for DN800 to DN2000 as standard and expands to DN3000 with the heavy mandrel configuration.
Why is HDPE chosen over concrete or steel for deep drainage tunnels?
HDPE is chemically inert across the full pH 2 to pH 12 range found in drainage and storage water, so it does not suffer the corrosion that limits concrete and steel service life. Its low mass simplifies hoisting and trenchless installation, and its flexible jointing tolerates ground movement. With a verified SN16 grade and a welded wall, it meets the fifty-year design life target without internal lining or cathodic protection.
How is ring stiffness controlled on a winding line?
Çember sertliği, yapısal duvarın yüksekliği, boşlukların şekli, boşluk sayısı ve dönüşler arasındaki kaynak kalitesiyle kontrol edilir. Üretim makinesi, bu özellikleri profil die geometrisi ve kaynak parametreleri ile ayarlar. Çember sertliği, duvarların ikinci moment of area değerine bağlı olarak artar ve çap küpüyle azalır. Bu nedenle, pratik bir ağırlıkta büyük bir çap elde etmek için, en iyi yapı geometrisi, yapılandırılmış yapıyı oluşturur.
Can recycled material be used in these pipes?
Yes, within limits. The structural layer can incorporate 20 to 30 percent properly cleaned regrind because the structural duty is dominated by geometry. The inner liner should remain full virgin material to keep the flow surface clean and smooth. Faygo lines use gravimetric feeding to hold the regrind ratio constant so melt behavior stays consistent pipe after pipe.
Boş duvarlı drenaj borusu için hangi standartlar geçerlidir?
Ana standartlar, Çin'de GB/T 19472.2, ISO 21138, EN 13476 ve ASTM F894 ile uluslararası eşdeğerleri kapsamaktadır. Performans, ISO 9969'a göre çember sertliği, ISO 3127'ye göre darbe, ISO 9967'ye göre kırılma oranı, fırın testi, kaynak soyulma testi ve kapalı su veya kapalı hava geçirgenlik testi ile doğrulanır. Kabul hedefleri, gerekli SN derecesi ile birlikte projeye göre belirlenmelidir.
Boş duvarlı boru ve çift duvarlı mukavemetli boru arasındaki fark nedir?
Her ikisi de yapısal duvarlı borulardır, ancak mukavemetli boru, genellikle DN1200'e kadar olan sabit maksimum çapla bir sürekli mukavemetli makine tarafından oluşturulur. Boş duvarlı drenaj borusu, bir mandrel üzerinde boş bir profili spiral biçimde sararak, çap tavanını kaldırır ve DN3000'e ulaşır. Sarma borusu ayrıca birim ağırlık başına daha yüksek bir çember sertliği verimi sağlar, bu nedenle derin ana ve tünel hizmeti için tercih edilen bir seçenektir.
Faygo, büyük çaplı bir boruda kaynak kalitesini nasıl kontrol eder?
Hat, her dönüşte infrasu redörsörlerle dönüş bölgesi sıcaklığını izler ve 210 ila 240 °C aralığından dışındaki dikişleri otomatik olarak işaretler veya reddeder. Dönüşler, ana malzemenin dayanımı en az %90'ına ulaşan bir dikişin varlığını doğrulamak için periyodik peeling testleri yapar. Zayıf bir dikiş, bölümlerin etkili ikinci moment of area'sını çökertir, bu nedenle dikiş doğrulaması, bir hat durma koşulu olarak değil, örnekleme kontrolü olarak ele alınır.
Sonuç
Super-large HDPE hollow wall winding pipe is the enabling technology for modern urban flood control and deep drainage tunnels, where diameters up to DN3000, ring stiffness up to SN16, fifty-year life, and resistance across the full pH range are non-negotiable. The production machine that makes this pipe is a synchronized sequence of extrusion, profile die, variable-diameter rotating mandrel, hot-melt welding, shaping, cutting, and on-line inspection, each tuned so the hollow wall delivers maximum stiffness per unit of polymer.
Faygo, a Wanplas factory with 22 years of pipe and profile extrusion experience, supplies the complete winding line and the complementary medium-diameter HDPE pipe line, both CE and ISO certified and tested for 72 hours before shipment. From material compounding through acceptance testing to installation, commissioning, and the USD 500 annual free parts policy, the support covers the full production life. If your project calls for DN800 to DN3000 flood-control or deep-tunnel pipe, send your diameter range, stiffness grade, output target, and installation method, and Faygo will configure a line and run a sample trial so you can verify the result before you commit.
