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
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
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