Abstract: A process for removing an aqueous slurry suspension comprising a blast medium and coating substance residues which produced when cleaning surfaces which have a corrosion protection coating. The process, which is particularly applicable to ships and industrial facilities, involves the steps of a) suctioning the aqueous slurry suspension by means of an air feed into a receiving tank which has an outside pressure to tank vacuum ratio of more than 1:0.52; b) diluting the suspension with water; c) continuous feeding of the diluted suspension by means of a pump overcoming a height differential>5 meters; d) separating the solids from the water by means of sedimentation in a settling tank; and e) recycling the separated water. Suctioning of the aqueous slurry suspension is by means of air into receiving a tank which has a vacuum of at least 0.5 bar with respect to atmospheric pressure, in combination with a pump which continuously feeds the water-diluted suspension over a height differential>5 meters.

Abstract: The invention relates to a method for carrying out work on an object of shipbuilding or building construction or industrial installations by means of hanging stages or cradles, which are connected to the object by means of a plurality of U-shaped fixtures. For a long time this method has suffered from the disadvantage that subsequent welding, flexing, breaking away and similar work led to damage to adjacent surfaces. It was also necessary to dispose of the separated U-fixtures or irons. This problem is obviated by the invention in that waterproof, stainless base plates (10) are fixed in spaced manner to the object so as to remain permanently thereon and the fixtures (16) are fixed to the base plate (10) by means of a redetachable screw or plug-in connection (14) and following the detachment and removal of the reusable fixtures (16) from the base plate (10), the screw or plug-in connection (14) is closed.