Abstract: A tube support device is used with tube bundle devices such as heat exchangers or, condensers with in-line tube arrangements (rectangular tube configuration) to mitigate the possibility of tube damage from flow-induced vibration in the tube bundle. The tube support comprises an elongated member or strip which is intended to be inserted in a tube lane between the tubes of the tube bundle. Raised-tube-engaging zones which include transverse, arcuate tube-receiving saddles are disposed along the length of the strip at successive longitudinal locations corresponding to the tube positions in the bundle. These tube-engaging zones extend laterally out, away from the medial plane of the strip, so that the saddles receive and closely hold the tubes on opposite sides of the tube lane.