Abstract: The invention relates to an installation for cleaning tubes in a tube assembly (1) such as a heat exchanger or a condenser, which assembly comprises n sections in parallel where n is an integer greater than 1, the tubes being cleaned by circulating balls in a flow of water inside the tubes. For each of its sections, the installation comprises a branch length of pipework (6) fitted with its own drive pump (8) and extending between an upstream device (7) for recovering balls that is mounted on the outlet from the section under consideration and a downstream device (10) for reinjecting balls that is mounted at the inlet (2) to said section. The installation has a single device (11) for injecting new balls which is connected to all n lengths (6) by a corresponding number of small diameter pipes (12), thereby enabling the n sections to be served in turn by means of said device and also enabling it to be located at a distance from the tubes to be cleaned, in a location that is easy to access.