MANUFACTURING OF HDPE, PLB AND DWC HDPE PIPES

Double Wall Corrugated (DWC) HDPE pipes are similar to normal HDPE pipes except that they have different external & internal surfaces which gives them additional strength and stiffness. These are made with High Density Polyethylene which has very high life expectancy. These are externally corrugated and have smooth surface inside and are available from 75 mm to 1.0 m dia. These pipes are light weight and can be used for non-pressure underground sewerage, drainage & cross drainage (pipe culvert) including rain water harvesting purposes. They are maintenance free and therefore, once installed, will lie underground for years. It is well-known that corrugated pipes can offer exceptional material savings, good hydraulic (flow) properties and high compression strength. For these reasons corrugated pipes have shown high growth rates in recent years resulting in the continued development of its production technology. Here we aim to give you an overview of the main characteristics, types and production technologies of corrugated pipes and show how well the corrugated pipe for sewage and drainage applications acquits itself compared to its two main competitors, the concrete pipe and the solid wall PE pipe. In the early days corrugated pipes benefitted from the growth in demand for telecommunication cable ducting. But in terms of material conversion tonnage, cable ducting has now been overtaken by drainage and sewage pipes for construction and infrastructure. Corrugated pipes can be made of a wide range of different materials such as polyamide (PA),thermoplastic elastomers (TPE), thermoplastic rubber (TPR), polytetrafluoroethylene (PTFE), but the primary raw material in the manufacture of corrugated pipes for water transportation is high-density polyethylene (HDPE), followed by polypropylene (PP) and polyvinyl chloride (PVC). Corrugated pipes can be as small as 1 mm. In the smaller diameter range up to 50 mm they are usually used for cable protection systems in house installations, and the medical, automotive and food industries. Mid-sized corrugated pipes (50 mm ID to 500 mm OD) are commonly used as protection pipes, drainage, sewage, storm water, civil engineering and conveyor pipes. And in the larger sizes up to 3,000 mm, the pipes are employed for storm water, sewage, control shafts, conveyor pipes and manholes. HDPE PLB (Permanently Lubricated) ducts are manufacture using high grade of HDPE with inner layer of antioxidant content and other additives. The inner layer is silicon coated which minimizes friction between OFC and the Duct during the Process of blowing the cable into the ducts, thus providing smooth installation, PLB HDPE Duct consist of two concentric layer. The outer layer being HDPE, Co-extruded with an inner uniform layer of solid silicone permanent lubricant to reduce the internal coefficient of friction, PLB Duct pipes are used as underground cable conduit for optical fiber cables communication cable etc. Corrugated pipes represent the ideal solution for the abduction of any kind of water, chemicals, affluent and sewers, because they combine the advantage of corrosion resistance. Typical properties that result in advantages in Corrugated Pipe can be summarized as follows: Higher mechanical resistance due to the structure of the pipe. Corrosion resistance, both of the external wall and internal wall in contact with the conveyed fluid. No protections such as coating, painting or cathodic are needed. Corrugated pipes are resistant to nearly all chemicals. Very long life, virtually infinite of the material which does not need maintaining. Low weight of pipes lengths that allows for the use of light laying and transport means. Easy installation procedures because laying of corrugated pipes is a simple operation which can be done in short periods of time both above and below ground, since sleeve joints and socket joints enable fast and reliable assembling. Workability of the material on sites employing simple equipment. Possibility of nesting of different diameters of pipe thus allowing additional.