A pressure-resistant tank has a jacket composed of a plurality of parallel extending part-cylindrical shells (10) with any adjacent pair of shells (10) being interconnected by a tubular longitudinal bar (15) extending along the bead area formed between said adjacent shells. Opposite longitudinal bars (15) are interconnected by tubular tie rods (18) which traverse the interior of the tank. Reinforcing pipe sections (20) are inserted into the longitudinal bars (15) in the areas where the tie rods (18) are joined to the longitudinal bars (15).