High-Density Polyethylene (HDPE) Pipes
High-density polyethylene pipes provide a durable and flexible piping solution for potable-water distribution, raw-water transmission, sewerage under pressure, irrigation, pumping, industrial services and underground infrastructure.
HDPE pipes offer excellent resistance to corrosion, impact, ground movement and many commonly encountered chemicals. Their flexibility and long continuous supply lengths make them suitable for buried pipelines, uneven ground, road crossings and horizontal directional drilling.
The range includes PE100 and selected PE80 solid-wall pressure pipes supplied in coils or straight lengths, depending on the pipe diameter, wall thickness and project requirements.
Description
| Pipe type | Common application |
|---|---|
| PE100 Potable-Water Pipe | Water mains, service connections and cold-water distribution |
| PE100 Pressure Pipe | Pumping systems, industrial water and general infrastructure |
| HDPE Sewer Pressure Pipe | Rising mains, pumped sewerage and vacuum sewer systems |
| HDPE Irrigation Pipe | Agricultural irrigation, landscaping and water transfer |
| HDPE HDD Pipe | Road crossings, river crossings and trenchless installations |
| HDPE Industrial Pipe | Cooling water, process water and selected chemical services |
| HDPE Marine Pipe | Water intake, outfall and selected submerged pipelines |
| PE100-RC Pipe | Demanding installations involving point loading or difficult ground conditions |
| Coiled HDPE Pipe | Small- and medium-diameter services and long continuous installations |
| Straight-Length HDPE Pipe | Medium- and large-diameter distribution and transmission pipelines |
Suitability for potable water, chemicals, fire-water, marine or specialised applications must be confirmed against the selected pipe specification.
Common Size Range
HDPE pressure pipes are normally specified by their actual outside diameter in millimetres.
| Pipe category | Common outside diameter | Common supply form |
|---|---|---|
| Small Service Pipe | 20–63 mm | Coils |
| Distribution Pipe | 75–110 mm | Coils or straight lengths |
| Water-Main Pipe | 125–315 mm | Commonly 6 m or 12 m straight lengths |
| Large Project Pipe | 355–630 mm | Straight lengths |
| Extra-Large Project Pipe | 710–1200 mm and above | Manufactured according to project requirements |
Common metric sizes include:
20, 25, 32, 40, 50, 63, 75, 90, 110, 125, 140, 160, 180, 200, 225, 250, 280, 315, 355, 400, 450, 500, 560 and 630 mm.
Actual available sizes, coil lengths and straight-pipe lengths depend on the manufacturer, SDR class and project quantity.
Common Material Grades
PE100
PE100 is the most commonly specified modern material grade for pressure-water pipelines. Its higher minimum required strength allows higher pressure ratings or comparatively thinner walls than PE80 at the same outside diameter.
PE80
PE80 is used in selected existing systems, smaller service pipes and applications where it is specified by the project.
PE100-RC
PE100-RC is a specialised PE100 material with enhanced resistance to slow crack growth. It may be specified for trenchless installation, reduced bedding, point loading or difficult ground conditions.
Material grade alone does not determine the pipe’s pressure capability. The PE grade, SDR, wall thickness, temperature and operating conditions must be considered together.
Common Specification Systems
| Specification | Meaning |
|---|---|
| OD | Actual pipe outside diameter in millimetres |
| PE80 / PE100 | Polyethylene material-strength classification |
| SDR | Ratio of pipe outside diameter to minimum wall thickness |
| PN | Nominal pressure classification at the specified reference temperature |
| Wall Thickness | Minimum wall thickness for the selected OD and SDR |
| Pipe Series or S Value | Dimensional classification related to SDR |
| Coil or Straight Length | Required supply and transportation form |
| Colour or Identification Stripe | Indicates the intended service, subject to manufacturer and project requirements |
For the same outside diameter and material grade, a lower SDR number indicates a thicker pipe wall and generally a higher pressure rating.
Common PE100 SDR and Pressure Ratings
The following are common PE100 water-pipe classifications at a reference temperature of 20°C:
| SDR class | Common nominal pressure |
|---|---|
| SDR26 | PN6.3 |
| SDR21 | PN8 |
| SDR17 | PN10 |
| SDR13.6 | PN12.5 |
| SDR11 | PN16 |
| SDR9 | PN20 |
| SDR7.4 | PN25 |
PN10, PN12.5 and PN16 are among the commonly requested pressure classes for Malaysian water-supply and infrastructure projects.
The SDR-to-PN relationship differs between PE100 and PE80. Allowable operating pressure may also require adjustment for temperature, pressure surges, service conditions and design life.
Common Standards and Requirements
- MS 1058-1:2023 – General requirements for PE piping systems
- MS 1058-2:2023 – Polyethylene pipes for water supply and pressure sewerage
- ISO 4427-1 and ISO 4427-2 – PE materials and pipes for water supply, drainage and sewerage under pressure
- BS EN 12201-1 and BS EN 12201-2 – PE materials and pipes for water supply and pressure sewerage
- ISO 4437 Series – PE pipes specifically manufactured and approved for gaseous fuels
- SIRIM product certification where required
- SPAN registration or water-authority approval where applicable
- JKR, state water operator and project-specific requirements
Certification and approval must be confirmed against the exact manufacturer, pipe series, size and pressure class offered.
Standard water pipes should not automatically be offered for gas applications. Gas installations require the correct gas-pipe specification, identification and regulatory approval.
Common Applications
- Potable-water mains and service connections
- Raw-water pipelines
- Water-treatment and pumping systems
- Sewerage rising mains
- Vacuum sewer systems
- Irrigation and agricultural water supply
- Commercial and industrial cold-water systems
- Cooling-water circulation
- Underground fire-water systems, subject to approval
- Horizontal directional drilling
- Road and river crossings
- Marine intake and outfall pipelines
- Temporary bypass and dewatering lines
- Selected chemical-transfer systems following compatibility verification
Important Ordering Information
Please confirm the following before placing an order:
- Intended application and conveyed medium
- Potable-water or other approval requirements
- Pipe outside diameter in millimetres
- PE material grade: PE80, PE100 or PE100-RC
- Required SDR and PN pressure class
- Minimum wall thickness
- Required coil length or straight-pipe length
- Quantity in metres, coils or pipe lengths
- Maximum operating pressure and pressure-surge conditions
- Maximum and minimum operating temperature
- Open-trench, above-ground, buried or HDD installation
- Required pipe colour or identification stripe
- SIRIM, SPAN, water-authority or project approval requirements
- Required certificates, test reports and manufacturer documentation
- Delivery access and unloading arrangements for long pipes or large coils
Technical Notice
HDPE pipes are outside-diameter controlled. Two pipes with the same outside diameter but different SDR ratings have different wall thicknesses and internal flow diameters.
HDPE solid-wall pressure pipes are also different from corrugated drainage pipes and cable ducts. Products of similar external size may have completely different wall structures, performance ratings and approvals.
Always verify the pipe dimensions, PE grade, SDR, pressure class, service conditions and applicable project specification before ordering.
