Brief summary
This article explores the characteristics of corrugated high-density polyethylene (HDPE) pipes, highlighting their suitability for underground structures due to their lightweight nature, durability, and resistance to abrasion and corrosion. It details the structural advantages of HDPE pipes, including their ability to handle large loads and relax under stress, contributing to long-term stability.
Corrugated HDPE Pipe Characteristics
High-density polyethylene (HDPE) is a versatile material that has some ideal characteristics for use in underground structures. HDPE pipe is relatively lightweight allowing for easier and less costly transportation and installation costs. It is not brittle and therefore not susceptible to cracking during pipe handling and installation activities.
Once formed into a pipe, HDPE has a smooth surface, which is resistant to abrasion, corrosion and chemical scouring. The smooth surface provides excellent pipeline flow characteristics. HDPE pipe is structurally strong and has the ability to support large loads. HDPE has the ability to relax under stress. This characteristic provides advantages for underground structures and also helps define limitations of use. As HDPE pipe is loaded, the pipe relaxes immediately and over time, allows the load to be transferred to the adjacent soil. This characteristic allows the pipe to off-load points of local stress. Stress relaxation may result in slight pipe reformation over time to accommodate in-situ loading conditions. Such reformations are believed to cause long-term structural stability.
Corrugated HDPE pipe is an excellent choice for gravity flow or low-head pipeline situations. The structural stability of corrugated HDPE pipe is produced by three pipe designs. According to AASHTO M294, they are defined as:
- Type C – This pipe shall have a full circular cross section, with an annular corrugated surface both inside and outside.
- Type S – This pipe is a full circular dual wall corrugated pipe, with an outer corrugated pipe wall and a smooth inner liner.
- Type D – This pipe is a circular cross section consisting of an essentially smooth inner wall joined to an essentially smooth outer wall with annular or spiral connecting elements.
* Type C HDPE Pipe with Interior and Exterior Corrugations
Advantages of Corrugated HDPE pipes
Corrugated pipes made from Polyethylene and Polypropylene raw materials and have a high resistance to corrosion. They have a guaranteed life of 50 years and can be used for 100 years. Since plastics are smooth hydraulic, they have a high resistance to flow and the fluid flows with a higher filling rate. This advantage reduces the project costs by selecting a lower diameter group in the project.
* Type S HDPE Pipe with Corrugated Exterior and Smooth Interior
Technical Applications for Corrugated HDPE Pipes
Flexible single wall, dual wall corrugated pipe and multi-layer corrugated pipe for the protection of cables in automotive and machine construction. Applications also in healthcare, telecommunications and household. › Diameters: from 3mm i.d. to 200mm o.d.
Cable protection: Flexible single-wall, double-wall and multi-layer corrugated pipe for cable protection in house building, road construction and long-distance circuits. › Diameters: from 10mm i.d. to 250mm o.d.
Drainage: Single, double or triple wall pipe for civil engineering, land and road drainage. › Diameters: from 50mm o.d. to 1200mm o.d.
Sewage and storm water: Double and triple wall pipe for wastewater and storm water disposal. › Diameters: from 100mm i.d. to 2400mm o.d.
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