Patent ID: 7093620

Claim:
A reinforced multilayer plastic pipe formed from a tubular support based on a polymeric composition, onto which support are wound reinforcing tapes comprising an oriented polymeric composition, wherein the tapes are selected from those that satisfy the following relationship: SI SI 0 ≥ 4 where: SI is a strength index of the reinforcing tape, calculated as follows: SI = σ 3 ⁢ E with: σ representing the maximum value of the stress reached during a tensile test on the tapes in the orientation direction, for an elongation corresponding to the yield point of the support or, otherwise, to the break point of the tape if the elongation at this break point is less than that of the elongation at the yield point of the support; E being the tensile elastic modulus of the oriented tapes; SI 0 = σ 0 3 ⁢ E 0 being the strength index of the support; and σ 0 and E 0 being the stress at the yield point and the tensile elastic modulus of the support, respectively, in which σ, E, σ 0 and E 0 are expressed in the same arbitrary tension units; and wherein it comprises at least two layers of tapes wound onto the support, each layer being formed from tapes making a similar angle, but of opposite sign, with the tapes of the other layer relative to the axis of the pipe.