Method of manufacture of a multiple finned tube

A method for the manufacture of a fin tube, comprising the steps of:

• a) forming helical extending fins on the outer surface of a smooth-surfaced tube by moving the fin material from the tube wall radially outwardly by means of a rolling operation;
• b) using, during the rolling operation, at least two rolling tools resting on the tube, which rolling tools consist of several side-by-side lying rolling disks with different diameters, which can be radially pressed into the tube wall and the shafts of which are arranged during the fin creation under a predetermined lead angle .alpha. with respect to the tube axis, which angle corresponds with the desired number of fin run starts n;
• c) supporting the smooth-surfaced tube on a rolling mandrel lying therein;
• d) rotating and/or axially advancing the fin tube by the rolling forces corresponding with the fins being created, with the fins being formed to an increasing height out of the otherwise nondeformed smooth-surfaced tube;
• and
• e) selecting a number of fin run starts n to be n>N, wherein N is the existing number of the rolling tools so that at least one of the rolling tools produces more than one fin run start.