The presented pipe systems with outer and inner protective layer are a new quality on the market. They ensure maximal safety for installations laid out in "difficult conditions". With the very high resistance of protective layers to the slowly growing incidence of cracks, the pipes are an appropriate solution for trenchless technologies, where scratches of pipe outer surface are unavoidable. The high resistance of these pipes to pointwise pressure allows for their layout directly on subsoil without any need of additional sub-crust and sand-pack layers.
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