Pipes, Drainage & Ducting
GeoPipe HD™ - Heavy Duty Slotted HDPE Collector Drainage Pipe
SN8 structured-wall HDPE collector drainage pipe in 200, 250 and 315 mm OD, supplied in 6 m lengths. Partial 120° or full 360° slotting to project specification; solid-wall option for conveyance. Black standard, with supply and delivery across South Africa and Africa.
Overview
GeoPipe HD Heavy Duty HDPE Collector Drainage Pipe
GeoPipe HD extends the drainage system to 200, 250 and 315 mm outside diameter for collector drains, groundwater interception, stormwater infiltration and gravity conveyance. The corrugated HDPE exterior and smooth internal waterway combine structural stiffness with convenient handling and low hydraulic resistance. Typical inside diameters are 173, 217 and 273 mm respectively.
The base structured-wall pipe is specified to SANS 21138-3, Type B, with SN8 ring stiffness (at least 8 kN/m², ISO 9969). Standard effective length is 6 m. Joints use an integral socket/bell end or plain ends with a separate coupling and suitable ring seal. SN8 is a pipe stiffness classification; cover, trench width, backfill quality, groundwater and imposed loads still require design checks.
Choose partially slotted pipe with 120° slotting at the crown and a solid invert, fully slotted pipe with 360° slotting, or solid-wall pipe for conveyance. Slot width and length are project-specific; inlet area depends on those selected dimensions. SANS 21138-3 applies to the base pipe before slotting and does not prescribe the perforation design. Require confirmation of the supplied slotted configuration and its performance for the project.
Use slotted GeoPipe HD for road and rail formation collectors, foundation and retaining-wall drainage, agricultural and sports-field collector lines, reservoir underfloor drainage, groundwater interception and designed infiltration trenches. Mine seepage or landfill fluid collection requires a specific chemical compatibility and drainage design review. Use the solid-wall configuration for gravity stormwater outlets and conveyance; cable routes require an approved unslotted duct specification.
Black is standard. Red telecom ducting is available on request within the cable protection offering; specify GeoDuct for that service. Do not use slotted drainage pipe as sealed cable conduit.
Install to the approved flexible-pipe design, with appropriate bedding, haunch support, compacted backfill, gradient and accessible outlets. Select geotextile and aggregate filters for the actual soil. Verify diameter, slot pattern, joint engagement, line and level, filter continuity and cover before handover.
Geosynthetics Africa supports material selection, project quantities, fittings, South African and cross-border delivery, and agreed installation and QA/QC scopes for African civil, mining, municipal and agricultural projects. Enquiries should state diameter, metres, slot configuration and dimensions, joint arrangement, filter requirements and delivery site.
- MaterialHDPE
- StructureType B structured wall; smooth bore; project-specified slots or solid-wall option
- ColourBlack standard; red telecom ducting on request via GeoDuct
- StandardSANS 21138-3 base pipe; SN8 (ISO 9969); slotting separately specified
- Roll WidthOD 200, 250 and 315 mm; typical ID 173, 217 and 273 mm
- Roll Length6 m effective straight lengths
Typical Properties
| Property | Test Method | Unit | Typical Value |
|---|---|---|---|
| Outside diameter | ISO 3126 | mm | 200 | 250 | 315 |
| Typical inside diameter | ISO 3126 | mm | 173 | 217 | 273 |
| Minimum mean inside diameter, base pipe | SANS 21138-3 / ISO 3126 | mm | 167 | 209 | 263 |
| Ring stiffness, base pipe | ISO 9969 | kN/m² | ≥8 (SN8); confirm slotted configuration |
| Base pipe standard | SANS 21138-3 | Type | B structured wall; slotting separately specified |
| Effective straight length | Supply | m | 6 |
| Slot configuration | Project specification | degrees | 120° partial or 360° full; width/length to order |
| Joint / colour | Supply | - | Socket or coupling with ring seal; black standard |
Note: The above values are typical and not intended for specification purposes. Please refer to the product datasheet for full details.
Typical Applications
View all applicationsRoad & Rail Formation Drainage
Intercept groundwater beside roads, railway formations and platforms using a designed network of standard laterals and GeoPipe HD collectors. Select diameter, stiffness, cover, filters and outlet spacing from the pavement drainage and loading design.
Retaining Walls & MSE Back-Drains
Collect water at the base of retaining walls, MSE structures and basements through a designed drainage layer and pipe system. Select the filter for the actual backfill; provide accessible outlets and maintenance points.
Mining Underdrain & TSF Drainage
Use engineered slotted collection systems for seepage beneath mine platforms, TSFs or containment works only after checking load, hydraulic capacity and compatibility with the actual fluids. GeoPipe HD collectors extend to 315 mm; project-specific engineering governs selection.
Sports Fields & Landscaping
Use slotted laterals and collectors to manage groundwater beneath turf, golf courses and landscaped areas. Set pipe spacing, depth and gradient from soil permeability and required drainage rate; select coil or straight formats for installation access.
Agricultural & Farmland Drainage
Manage waterlogging using designed field laterals feeding collector mains and an approved outlet. Specify filtration from soil grading and clogging risk. Standard drainage coils are 50 m in 75-160 mm; HD collectors are available to 315 mm.
Compatible Systems
View all systemsGeoPipe 75 & 110 mm - Standard Drainage
75 and 110 mm OD standard slotted pipe for French drains, foundation perimeters, field laterals and landscape drainage. Choose 6 m lengths with 270° slots or 50 m coils with 360° slots. Typical IDs 60 (±1) and 90 mm. Filter selection and loading must suit the design.
GeoPipe™ DN160 - Normal Duty Collector
160 mm OD standard drainage pipe with typical 137 mm ID. Standard formats are 50 m coils with 360° slots or 6 m lengths with 270° slots. Use hydraulic design to size collector lines and define gradients, filters and outlets.
GeoPipe HD™ DN200 - Heavy Duty Collector
200 mm OD / typical 173 mm ID in 6 m lengths. SN8 base pipe to SANS 21138-3; 120° partial or 360° full slots with project-specified dimensions. Confirm finished slotted performance and burial design.
GeoPipe HD™ DN250 - Heavy Duty Collector
250 mm OD / typical 217 mm ID in 6 m lengths for designed collector systems. SN8 base pipe to SANS 21138-3; choose 120° partial or 360° full slots. Chemical compatibility must be checked for mining or landfill fluid collection.
GeoPipe HD™ DN315 - Primary Main
315 mm OD / typical 273 mm ID in 6 m lengths for larger collector and gravity drainage duties. Specify slotted collection or solid-wall conveyance, joint and seal requirements. Cover, backfill, loading and capacity require engineering review.
Installation Guidance
Standard Method Statement
Excavate to the engineered depth, width and gradient. Select bedding and flexible-pipe support for the pipe, soil, groundwater and loading. Refer to the project specification and applicable buried-pipeline requirements, including SANS 10102-2 and SANS 2001-DP1 where specified.
Verify diameter, configuration and condition before laying. Orient partially slotted pipe using the product marking with the solid invert below: standard 270° lengths and HD 120° crown slots differ. Fully slotted coils or lengths collect around the circumference. Maintain coil bend radius of at least 15 × OD and inspect joint engagement.
Install compatible filter aggregate and geotextile or the specified sock arrangement. Filter selection must match soil and hydraulic requirements. Provide uniform side support and protect pipe and filtration layers against displacement or damage during backfill.
Backfill and compact to the approved sequence and cover before plant access. Verify gradient, outlet, inspection and flushing access. Record material identification, slot pattern, line and level, joints, filters, bedding and cover as the installation QA/QC record.
Quality Assurance & Testing
Field QA/QC Checklist
- Delivery & Storage: Materials checked against the delivery note and conformance certificates, stored off the ground, covered from UV and kept clear of sharp objects and fuel.
- Material Conformance: Pipe certificates checked for diameter, ring stiffness and perforation pattern against the specification.
- Trench & Bedding: Trench excavated to line and grade; bedding and filter material placed as designed (geotextile wrap or sock where specified).
- Laying & Joints: Pipe laid to the design fall with couplers fitted; perforations oriented as specified.
- Backfill & Flushing: Backfilled with the specified drainage aggregate; outlets and rodding points installed and the line flushed or CCTV-inspected where required.
Manufacturing Standards
- Manufacturer pipe specification and certificates
- Project drainage specification
- SANS 21138-3 base pipe; SN8 (ISO 9969); slotting separately specified
Documents
Product Selection Guide
Compare performance properties across the entire category hierarchy before specifying.
Installation & Method Statement
Standard deployment procedures, installation specifications, and field application method statements.
QA/QC Site Checklist
Field quality control procedures, inspection checklists, and testing standards to verify installation integrity.
Technical Data Sheet (TDS)
Guaranteed minimum average roll values (MARV) and material testing properties.
Chemical Resistance / Accessories Guide
Chemical compatibility matrix and list of auxiliary materials needed for installation.
Projects Using GeoPipe HD™ - Heavy Duty Slotted HDPE Collector Drainage Pipe
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