Advertisement
5. Insert the hull unit into the retraction tank and orient the hull unit so that the bow mark (in-
scribed on the hull unit flange) points toward the ship's bow.
Also, take note of the waterproofing gasket bolts holes and the flange bolt holes. Make sure
all three bolt holes align.
Note: Heading adjustment is required if the bow mark is not facing the ship's bow. (See "How
to Adjust the Heading" on page 3-9.)
6. Apply a slight amount of lithium grease to the threads of the stud bolt on the hull unit, to pre-
vent scorching.
7. Put a flat washer, spring washer and two hex nuts (in that order) on the stud bolt. Fasten the
two hex nuts by hand.
8. Insert the bolts with washers from the retraction tank flange, and then put one flat washer, one
spring washer and one hex nut on each bolt. Fasten the hex nuts by hand. Leave one bolt
hole empty (you should have one bolt, on spring washer, two flat washers and one hex nut
remaining).
9. Fasten the hex nuts at all locations (except the empty bolt hole), to secure the flanges in place.
Insert the final bolt, using the same order for washers and the nut as described in step 8, then
fasten the hex nuts on the final bolt.
10. Check that all bolts are firmly fastened, that the flanges are connected evenly and that no "bit-
ing" of the waterproofing gasket has occurred. Re-fasten as required.
Hex nut
Spring washer
Flat washer
Bow mark
Hull unit flange
Waterproofing
gasket
Retraction tank flange
Flat washer
Hex bolt
Bow side
Spring
washer
Flat
washer
Hex bolt
(17 places)
Hex nut
Gaskets
Retraction
tank
Fastening torque for all flange hex nuts: 230 N•m
APPENDIX 2 FRP TANK INSTALLATION
Stern side
Gaskets
Flat
washer
Spring
washer
Hex nut
AP-3
Hide quick links:
Advertisement
