Abstract: A cleaning installation of a heat exchanger includes a heat exchanger linked upstream to an intake duct for a fluid and downstream to an outlet duct for the fluid. A system is provided for recovering cleaning bodies from the outlet duct after cleaning of the exchanger by the bodies and for reinjecting bodies into the intake duct. The system includes a member capable of being displaced between a first position in which the system is configured to recover and contain cleaning bodies in the mobile member, and a second position in which the system is configured to take fluid from the intake duct and reinject, into this duct, via the mobile member and under the action of the fluid taken, cleaning bodies contained in the member.

Abstract: A method and apparatus for passing migratory fish by dams to the sea. The method includes the creation of a water flow within a main conduit and in one or more collection conduits flowing into the main conduit from spawning areas; lighting the interior of the tubes by artificial lights to attract the fish and keep the fish moving downstream within the conduits; and emptying the fish and water on the downstream side of a dam, preferably by siphoning the water and fish over the dam. The apparatus includes the collection conduits; the main conduit receiving input from the collection conduits; pumps for creating water flow; a lighting system within the conduits; a siphon over the dam; and an open flume for non-pressurized passage of the fish down to the downstream level below the dam.