HIGH SPEED DRILLING – 400 m for Einungstølsåna Hydropower Plant in 6 days
Pressure shaft for Einungsølsåna Hydropower Plant:
Diameter: 1200 mm
Length: 400 m
Customer: Sunnhordaland Kraftlag
The directional drilling of the diameter 400 mm pilot tunnel was finished in less than one week.
Maximum drilling length over a 12 hours shift was 49 m which is new Norhard ROP record.
Next step - reaming up to diameter1200 mm before installation of steel lining - diameter 1100 mm.