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1-5
1.1.4 Installing hull unit on retraction tank
After welding the retraction tank and allowing sufficient time for cooling, install the hull unit
as follows:
1. Clean the hull unit flange, the O-ring and O-ring groove. Coat them with a slight amount
of grease. Place the O-ring in position on the tank flange.
2. Orient the hull unit so that the bow mark (inscribed) on its flange points toward the ship’s
bow. Note that heading adjustment is required if the bow mark is not facing the ship’s
bow.
3. Confirm that the O-ring is in position. Place the hull unit on the tank.
4. Coat every washer, nut and bolt with a slight amount of grease to ease removal. Fasten
the hull unit to the retraction tank with flat washers, spring washers and hex bolts.
5. Reinforce the hull unit against vibration by extending stays to the ship’s hull from the two
eye bolts at the top of the hull unit, referring to the procedure on page 1-7.