What type of pipe is typically used for trenchless rehabilitation methods?

The use of Polyvinyl Chloride (PVC) or High-Density Polyethylene (HDPE) for trenchless rehabilitation methods is primarily due to their flexibility, durability, and resistance to corrosion. Trenchless rehabilitation techniques often involve inserting new pipe materials into existing pipelines without extensive digging, minimizing surface disruption.

PVC and HDPE pipes are lightweight, making them easier to handle during installation processes such as pipe bursting or slip lining. Their smooth inner surfaces help to reduce friction losses and improve flow rates, which is crucial when rehabilitating deteriorating infrastructure. Moreover, both materials are chemically resistant, meaning they can withstand various substances found in wastewater or stormwater systems, thereby extending the service life of the rehabilitated section.

In contrast, materials like copper or cast iron may not be suitable for these methods due to their rigidity and weight, making installation more complicated and potentially damaging to surrounding areas. Steel, while strong, is also more susceptible to corrosion unless adequately treated and may require more extensive setup and maintenance in trenchless applications.