Patent ID: 8302634

Claim:
A method of producing a flexible pipe comprising a metal carcass and an internal sealing sheath extruded onto the carcass, said method comprising the steps of providing a metal carcass; heating an application section of said carcass to an application section temperature of at least about 150° C.; extruding a non-cross-linked polyethylene material comprising a peroxide having an activation temperature above about 150° C. onto said application section of said carcass; cross-linking the extruded polyethylene in a cross-linking zone by raising its temperature to at least the activation temperature of said peroxide by exposing the extruded polymer material to electromagnetic waves, with a wavelength of between about 0.5 μm to about 0.5 m; and cooling said cross-linked polyethylene material to obtain the internal sealing sheath.