Construction of a butane gas storage with Nippon Foundation Engineering as drilling sub-contractor and a propane gas storage with New Japan Development as drilling sub-contractor. 60 meter long vertical and horizontal holes are drilled which will then be pressurized to prevent gas from escaping. Hole straightness is a key factor which is why Wassara was chosen by both companies.
An often asked question is if you can run the Wassara hammer on sea water. This project is ample proof that this is indeed possible.
Tomec, model JS135E
Koken drill boom, Komatsu crawler