Polyolefin multilayer pipe

1) polyolefin multilayer pipes where at least one of the layers of the multilayer pipe comprises a propylene homopolymer with melt indices of 0.05 to 10 g/10 min at 230° C./2.16 kg or a propylene block copolymer from 90.0 to 99.9% by weight of propylene and 0.1 to 10.0% by weight of α-olefins with 2 or 4 to 18 carbon atoms with melt indices of 0.05 to 15 g/10 min at 230° C./2.16 kg, or mixtures thereof, wherein the propylene homopolymer and/or propylene block copolymer are β-nucleated propylene polymers and where the β-nucleated propylene homopolymer has an IRτ≧0.98, a tensile modulus of ≧1500 MPa at +23° C. and a Charpy impact strength, using notched test specimens, at −20° C. ≧3 kj/m2 and where the β-nucleated propylene block copolymer has an IRτ of the propylene homopolymer block of ≧0.98, a tensile modulus of ≧1100 MPa at +23° C. and a Charpy impact strength ≧6 kJ/m2 at −20° C. using notched test specimens and the multilayer pipe with a pipe diameter of less than 0.25 m has an impact energy ED (normalised) of at least 400 Nm/m and a ring stiffness S determined according to ISO 9969≧4 kN/m and a multilayer pipe a pipe diameter of ≧0.25 m has impact energy E of at least 120 nm and a ring stiffness S determined according to ISO 9969≧4 kN/m2.