Abstract: An encapsulated pickling plant that operates under a permanent vacuum. The pickling plant contains at least one pickling bath, at least one lock gate in the encapsulation for introducing and removing the material to be pickled as well as an air supply and a suction station, a directed air stream into the interior of the encapsulation supported by the suction, and at least one air supply provided in the area of the lock gate. The air supply is provided within the lock gate in one embodiment, and is located on both sides of the lock gate in a second embodiment.

Abstract: A self-supporting receptacle, especially for use as an electrolysis cell, has its walls composed of glass fiber reinforced synthetic resin in a double-shell construction with the shells held apart by spacers.