Abstract: A device for attaching an element for rotation in a tube comprises a conical sleeve, a hook and a link-pin. The link-pin interconnects the hook and the sleeve while permitting rotation of the hook. A particular application of the attachment device is to position an Archimedes' screw in the tubes of a multitubular heat exchanger, a steam condensor or the like. The assembly can be dismounted, if desired, and is adaptable to different tube diameters.

Abstract: A device for cleaning the tubes of tube-type heat exchangers and/or preventing the accumulation of deposits therein, the device consisting of a helix of a material which is resistant to corrosion and abrasion, which can be constantly agitated and thus repeatedly brought into contact with the internal walls of the tubes under the effect of the fluid stream the helix being held in position against longitudinal movement by a hooking means disposed at the upstream end of the helix which means permits the rotation of the helix within the tube. Use of said device for the automatic cleaning of tube-type heat exchangers.