Steel penstock of inner diameter 2250 mm and thickness 58 mm, in a sub-horizontal tunnel, with blocked vertices without movement joints and intermediate pin supports. Length of approximately 245 m with a hydraulic drop of about 920 m. The pipe originates from an initial branch connecting to the existing pipe, blocked inside rock, which gradually passes from the existing penstock of inner diameter 2550 mm to the new pipe of inner diameter 2250 mm.
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