Brief characteristics of laying RC MULTIsafe® and RC MAXIprotect® PP/PE pipes using trenchless methods
Brief characteristics of laying RC MULTIsafe® and RC MAXIprotect® PP/PE pipes using trenchless methods.
This method is used for replacement of existing pipes, having numerous and extensive damages, or requiring increase of their hydraulic output. Crushing of pipes is realized with use of special head, which increases diameter in order to insert the new pipe. Pieces of old pipe are pressed into the surrounding soil. New pipe of the same or higher diameter is pulled or pushed through the old pipeline. For that method the pipes RC MAXIprotect® PP/PE, are particularly recommended, i.e. carrier pipes from PE100 RC with protective layer made of minerally modified PP.
That method makes use of the polyethylene natural flexibility, perfect for passing the new pipelines under such obstacles as rivers, roads, railroads, etc. Depending on soil type the pipes RC MULTIsafe®, andd RC MAXIprotect® PP/PE may be used.
This method is commonly used for renovation of pipelines with use of PE pipes for many years. It is used for steel and cast iron pressure pipes, heavily degraded due to corrosion, which leads to many failures. In that method PE pipe is pulled into the old pipeline through the entry pit. The dimensions of the pit must allow for pulling the pipe with appropriate bending radius. While determining it keep in mind the relation between the allowable radius and temperature and the fact that with an ambient temperature below 20°C the minimum bending radius significantly increases.