Is the line gravity flow?
Sewer, stormwater, drainage and project-reviewed marine outfall enter this system route.
Gravity & structural duty · Core system 01
Steel-reinforced spiral-woundPE structured-wall pipe
A steel-wire-reinforced HDPE structured-wall system for sewer, stormwater, drainage and oversized buried infrastructure—selected around flow, stiffness, ground, jointing and logistics.
6 mPublished project-specific manufacturing capability after technical review
Last technical review 28 Aug 2026Reviewed by Shunfang Engineering Team
01 / Project fit check
Start with the duty.
Not the catalogue.
Direct answer
Large-diameter HDPE structured-wall pipe is the gravity-flow route for sewer, stormwater and buried drainage projects. Selection starts with flow and diameter basis, then ring stiffness, burial conditions, jointing, installation quality and logistics.
Does buried structural duty matter?
Ring stiffness must be reviewed with burial depth, soil, groundwater, traffic loading, bedding and compaction.
Is oversized logistics a design input?
Above 3 m, transport route, lifting, jointing space and possible on-site production should be assessed early.
A catalogue diameter is not a complete buried-pipe specification.Compare pressure pipe →
02 / The cost of assumption
6 m
A possible pipe is not yet a deliverable pipe system.
Diameter basis
DN, inside diameter and outside diameter must not be compared as if they are the same value.
Installed performance
Pipe stiffness cannot be separated from soil, cover, groundwater, loading and installation quality.
Connection scope
Structure, diameter, access, sealing duty and approved field procedure determine the jointing method.
Oversized delivery
Transport, mobilisation, storage and installation sequence can change the total project plan.
03 / What it is
Understand the wall before comparing numbers.
A reinforced polyethylene profile is spiral wound and thermally bonded into a structured wall. Each material layer has a specific engineering job.
Smooth PE inner layer
Creates the sealed flow surface and separates the conveyed medium from the reinforcement.
Steel-wire reinforced rib
Provides the principal structural contribution within the hollow profile.
Thermally bonded outer protection
Completes the composite wall and protects the reinforced structure.
Engineering boundary: Final suitability depends on flow, diameter basis, wall structure, ring stiffness, burial depth, ground, groundwater, traffic loading, jointing and installation quality.
04 / From feature to project value
Six advantages.
Each tied to evidence.
Oversized flow capacity
Published dimensions extend to DN5000, with project-specific capability up to 6 m.
Published tableBurial-specific structure
Wall construction and stiffness can be reviewed against the installed ground and loading conditions.
Structure + design basisCorrosion-resistant bore
The polyethylene flow passage supports drainage environments subject to compatibility review.
Material declarationLong section planning
Coordinated section length can reduce the number of field interfaces requiring control.
Route layoutMultiple jointing methods
Socket, sealing, heat-shrink, fusion and electrofusion options support project-specific connection planning.
Joint procedureAlternative production location
For projects above 3 m, factory delivery can be compared with on-site manufacturing feasibility.
Logistics study
6 m
Scale must be seen before it is believed.
Published dimensional data reaches DN5000. Manufacturing capability can extend to project-specific structured-wall systems up to 6 m after technical review.
05 / Application fit
Enter through the project condition.
Application names are the first filter. Flow, burial, loading, ground and jointing complete the decision.
Municipal sewer & drainage
Flow · burial · groundwater · stiffnessStormwater & flood control
Peak flow · loading · route · outletsIndustrial & mining drainage
Medium · abrasion · ground · accessMarine outfall & gravity conveyance
Route · handling · joints · deployment06 / Oversized logistics
When the pipe is possible— but transport is not.
For pipe projects above 3 m, compare conventional factory delivery with moving production equipment closer to the project.
This checklist identifies missing inputs. It does not calculate or approve a final design online.
0/4 indicators
Select the conditions that describe your project.
Technical specification table
Structured-wall pipe dimensional reference
The technical table lists nominal diameter, minimum average inside diameter and minimum inner-layer wall thickness from DN160 to DN5000. Manufacturing capability extends to project-specific pipe systems up to 6 m.
| Nominal diameter dn (mm) | Minimum average inside diameter dim,min (mm) | Minimum inner-layer wall thickness (mm) |
|---|---|---|
| 160 | 155 | 1.3 |
| 200 | 195 | 1.5 |
| 250 | 245 | 1.8 |
| 300 | 294 | 2.0 |
| 400 | 392 | 2.5 |
| 450 | 441 | 2.8 |
| 500 | 490 | 3.0 |
| 600 | 588 | 3.5 |
| 700 | 673 | 4.0 |
| 800 | 785 | 4.5 |
| 900 | 885 | 5.0 |
| 1000 | 985 | 5.0 |
| 1100 | 1085 | 5.0 |
| 1200 | 1185 | 5.0 |
| 1300 | 1285 | 5.0 |
| 1400 | 1385 | 5.0 |
| 1500 | 1485 | 5.0 |
| 1600 | 1585 | 5.5 |
| 1700 | 1685 | 5.5 |
| 1800 | 1785 | 6.0 |
| 1900 | 1885 | 6.0 |
| 2000 | 1985 | 6.0 |
| 2100 | 2085 | 6.0 |
| 2200 | 2185 | 7.0 |
| 2300 | 2285 | 8.0 |
| 2400 | 2385 | 9.0 |
| 2500 | 2485 | 10.0 |
| 2600 | 2585 | 10.0 |
| 2700 | 2685 | 10.0 |
| 2800 | 2785 | 10.0 |
| 2900 | 2885 | 10.0 |
| 3000 | 2985 | 10.0 |
| 3100 | 3085 | 10.0 |
| 3200 | 3185 | 10.0 |
| 3300 | 3285 | 10.0 |
| 3400 | 3385 | 10.0 |
| 3500 | 3485 | 10.0 |
| 3600 | 3585 | 11.0 |
| 4000 | 3985 | 12.0 |
| 4500 | 4485 | 13.0 |
| 5000 | 4985 | 14.0 |
DN means nominal size; confirm whether the specified series is based on inside diameter (DN/ID) or outside diameter (DN/OD). Do not treat DN as a measured diameter. SN indicates nominal ring stiffness, normally expressed in kN/m²; confirm the test method and required class. PE means polyethylene; HDPE means high-density polyethylene. PE80 and PE100 are material strength classifications, not pressure ratings.
Use the table for preliminary selection. Confirm final dimensions, pipe construction, pressure rating or ring stiffness and compatible joints against the project requirements. Pressure-test results for one specimen do not establish the rating of every diameter or configuration.
08 / Connection & installation
The joint is part of the system.
Not an afterthought.
The method must match the composite structure, diameter, duty, working space, equipment and approved procedure.
09 / Evidence chain
From material to installed reality.
15-second proof
Excavator load test, up close.
Structured-wall pipe under an excavator — external-loading duty recorded on site.
Structure
Cutaway, profile and material-role documentation.
Manufacture
Winding line, dimensional checks and order traceability.
Connection
Approved method, qualified people and inspection steps.
Field
Project-specific handling, installation and acceptance evidence.
Malaysia export · Ulu Tubai drainage
Malaysia Ulu Tubai Drainage Project
DN1800 spiral-wound structural-wall pipe, SN16, supplied for the Ulu Tubai drainage project in Malaysia for highway construction. Factory dispatch, container-port loading and SIRIM-certified pipes at the Malaysia site are recorded in project photos.
Overseas cooperation · Africa
Africa Water & Drainage Cooperation
An African customer delegation visiting the Shunfang factory to review large-diameter pipe production for water and drainage project cooperation, under international market development.
Buried drainage
DN1200 Reinforced PE Composite Pipe Installation
A documented DN1200 reinforced PE composite pipe installation in an excavated trench.
Pipeline construction
DN900 Reinforced PE Composite Pipe Site
A published DN900 site reference for Shunfang reinforced PE composite pipe.
Municipal drainage
Jinan Sewer and Stormwater Separation Project
A municipal sewer and stormwater separation reference in Jinan included in the official project archive.
Supply capability
Five RPEP lines.
30 plus die sets.
Dedicated reinforced PE composite-pipe (RPEP) lines cover DN110 to DN800. Each line holds its own die, mandrel and cooling-jacket sets, so diameter changes do not stop the full production schedule. Larger diameters follow project-specific wound routes — confirm the route for the specified diameter.
DN110–DN250
Complete RPEP line · 6 sets of dies, mandrels and cooling jackets · DN110, 125, 160, 200, 225, 250
DN250–DN450
Standby line · 3 spare sets of dies and mandrels · DN250, 280, 315, 355, 400, 450
DN400–DN500
Complete RPEP line · 6 sets of dies, mandrels and cooling jackets · DN400, 450, 500
DN400–DN630
Complete RPEP line · 5 sets of dies, mandrels and cooling jackets · DN400, 450, 500, 560, 600, 630
DN500–DN800
Complete RPEP line · 5 sets of dies, mandrels and cooling jackets · DN500, 560, 630, 710, 800
DN450 and DN630 RPEP equipment
Large-diameter RPEP equipment on the factory floor, backed by incoming inspection records for every production batch.
10 / Digital-to-field workflow
A predictable route from project input to deployment.
Submit inputs
Application, flow, diameter basis, stiffness, quantity, location, schedule and drawings.
Review duty
Separate gravity requirements from pressure duty and identify missing design information.
Configure system
Review wall structure, connection, production route, fittings and inspection basis.
Compare logistics
Assess factory delivery, oversized handling and on-site production feasibility when relevant.
Control production
Agree manufacturing, dimensional checks, traceability and documentation requirements.
Support deployment
Coordinate delivery, jointing procedure and installation guidance within the agreed scope.
11 / Project questions
Good suppliers make the limits visible.
What is large-diameter HDPE structured-wall pipe used for?
It is reviewed for gravity-flow sewer, stormwater, drainage, flood-control, casing and marine-outfall duties where flow capacity and buried structural performance both matter.
How is the 6 m capability applied?
It supports project-specific systems. Final configuration is developed around flow, diameter basis, wall structure, stiffness, burial, connection and logistics.
What determines the required structured wall?
Flow, diameter, ring stiffness, burial depth, soil, groundwater, traffic loading, connection and installation quality must be considered together.
Is every connection suitable for every diameter?
No. The approved method depends on pipe structure, diameter, access, power, sealing duty and project procedure.
Drainage PE composite pipe
A reinforced rib for gravity drainage
Drainage reinforced PE composite pipe uses spiral-wound strips with steel-wire-reinforced hollow ribs. Flow, ring stiffness, ground conditions and jointing guide product selection.
Download the English brochure (PDF) ↓ · Download centre →
Hollow rib and bonded PE layers
The hollow-rib strip contains steel-wire reinforcement. Spiral winding, bonding and an outer PE protective layer form the drainage wall. The published dimensional table covers DN160–DN5000.
01 · Overview & structure
Hollow-rib steel-wire-reinforced wall
Drainage reinforced PE composite pipe is wound from hollow-rib steel-wire-reinforced strips for diameters above 5 m; the layered rib-wire structure reaches the specified ring stiffness, produced entirely from virgin material.
A screw extruder forms double-chamber ribbed strips, which are spiral-wound and hot-bonded before outer wire and PE protection layers are added.
Hollow-rib section
Hollow rib cavities save weight; the metal dots in section are the longitudinal wires, fully encased in PE with no exposure.
Spiral-wound blue ribbed pipe body; the external ribs are the source of ring stiffness.
02 / Product characteristics
Five product characteristics
01Flexibility, corrosion and fatigue resistance, smooth walls
Virgin PE100/PE80 high-molecular-weight polyethylene gives flexibility, corrosion and fatigue resistance and smooth walls. Light yet strong; no recycled material.
02Unlimited diameter
Spiral-wound steel-wire-reinforced strips set the diameter by the steel core mould, enabling large-diameter production.
03Integrated wall
Adjacent strips are hot-bonded with dedicated adhesive and pressed into one integrated wall.
04Bending resistance and high ring stiffness
Carbon spring-steel wire exceeds 1800 MPa tensile strength — about 4.5 times ordinary steel (approx. 400 MPa) — giving strong bending resistance, high ring stiffness and elastic recovery after loading.
05Acid, alkali, salt and solvent resistance
Saturated long-chain PE structure with fully encased wire resists acids, alkalis, salts and solvents; 40-year buried service life stated.
03 / Drainage-pipe jointing
Four connection methods
01
Heat-shrink sleeve
A sized heat-shrink sleeve lined with hot-melt adhesive is heated with an LPG flame to shrink and bond over both pipe ends. Callouts: 1 pipe; 2 heat-shrink sleeve.
02
Sealed socket joint
One spigot end with sealing rings enters the socket end and is pushed home with joining equipment. Callouts: 1 pipe; 2 socket; 3 spigot; 4 sealing ring.
03
Butt-fusion welding
Cleaned and squared ends are welded with dedicated butt-fusion equipment for a reliable watertight joint. Callouts: 1 pipe; 2 reinforcing rib; 3 butt weld.
04
Electrofusion band
The electrofusion band runs at least 1.2 turns along the rib groove with internal support and external clamps; longitudinal seams are finished by extrusion welding. Callouts: 1 pipe; 2 rib; 3 joint; 4 band.
04 / Physical performance
Pipe physical performance
| No. | Item | Unit | Requirement |
|---|---|---|---|
| 1# | Appearance | / | Smooth, uniform appearance |
| 2# | Tensile strength | MPa | ≥20 |
| 3# | Elongation at break | % | ≥200 |
| 4# | Flexural modulus | MPa | ≥1500 |
| 5# | Ring stiffness | kN/m² | ≥12.5 (SN12.5) |
| 6# | Ring stiffness | kN/m² | ≥16 (SN16) |
| 7# | Impact resistance | % | ≤10 |
| 8# | Creep ratio | % | ≤3 |
| 9# | Ring flexibility | / | No reverse bending or cracking; tearing under 75 mm |
| 10# | Oven test | / | No bubbles, delamination or cracking |
| 11# | Oxidation induction time (OIT) | Min | ≥30 |
| 12# | Longitudinal reversion | / | ≤3%, no delamination or cracking |
05 / Applications
Application areas
- Municipal drainage and sewer systems
- Apartment and residential underground drainage
- Sponge-city rainwater collection networks
- Farmland irrigation, drainage and water-conservancy works
- Chemical and mining fluid transport and ventilation
- Underground utility and telecom cable protection sleeves
- Golf-course subsurface drainage networks
Standards
Product standards
T/CWEC 10-2019
Product standard for reinforced PE composite pipe.
GB/T 19472.2-2017
Buried PE structured-wall piping systems, Part 2: spiral-wound structured-wall pipe.
06 / Projects
Drainage projects
Jinan urban drainage and sewer separation
2022 project · DN300–DN600 · SN12.5 · 30 km of pipeline.
Rizhao Port project
DN1600 large-diameter drainage installation.
Shijiazhuang north drainage retrofit
DN2600 extra-large drainage pipeline.
Malaysia DN1800 structured-wall export
DN1800 spiral-wound structured-wall pipes exported to Malaysia.
12 / Your project basis
Send the facts.Get the next technical step.
We will review product fit, missing design inputs and the practical manufacturing and delivery route. Website information is not treated as final project design.
ApplicationLocationDN / ID / ODRing stiffnessLength & quantityScheduleDrawings