Abstract: This invention relates to a pipe (1) having several internal ribs (2, 3, 4) having a spiral twist, where the ribs run with rotational symmetry with the longitudinal axis (5) of symmetry of the pipe (1). This invention creates a heat transfer pipe that will be characterized by a much better heat transfer in comparison with the previously known pipes having internal ribs, and to this end it guarantees not only an increase in the internal heat transfer surface area but also an effective cross-flow between the inside wall surface of the pipe and the core flow near the longitudinal axis of symmetry. To that end, the free ends (2c, 3c, 4c) of the internal ribs (2, 3, 4) are a distance (a) from the longitudinal axis (5) of symmetry of the pipe (1), which is in the range of 1:12 to 1:3 in relation to the inside diameter (d) of the pipe; and all the internal ribs (2, 3, 4) run in the same direction (arrow 6) and with the same spiral length (L) with a spiral twist to the longitudinal axis (5) of symmetry.

Abstract: This invention relates to a pipe (1) having several internal ribs (2, 3, 4) having a spiral twist, where the ribs run with rotational symmetry with the longitudinal axis (5) of symmetry of the pipe (1). This invention creates a heat transfer pipe that will be characterized by a much better heat transfer in comparison with the previously known pipes having internal ribs, and to this end it guarantees not only an increase in the internal heat transfer surface area but also an effective cross-flow between the inside wall surface of the pipe and the core flow near the longitudinal axis of symmetry. To that end, the free ends (2c, 3c, 4c) of the internal ribs (2, 3, 4) are a distance (a) from the longitudinal axis (5) of symmetry of the pipe (1), which is in the range of 1:12 to 1:3 in relation to the inside diameter (d) of the pipe; and all the internal ribs (2, 3, 4) run in the same direction (arrow 6) and with the same spiral length (L) with a spiral twist to the longitudinal axis (5) of symmetry.