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 APPENDIX B
MOORING COMPONENTS
1.1 GENERAL. This appendix discusses the various types of fleet mooring material
components currently in use and describes their distinctive
characteristics. For clarity, sketches of these components are included (all figures
may be found at the end of this appendix).
1.2 FLEET MOORING BUOYS. The size of the buoy used in a particular fleet mooring
is dependent on the depth of the water and the weight of the chain suspended in
the water column. Figure B-1 shows the four types of buoys commonly used in fleet
moorings.
1.2.1 BUOY SYSTEMS. Buoy systems fall into two categories, riser and non-riser-
types, depending upon the configuration of the ground tackle securing them to the
sea floor. Riser-type systems have a single point at the center of the bottom of the
buoy to which a riser chain is attached. The non-riser-type system has a larger buoy
with three to four padeyes attached to its circular bottom edge. Each of these
padeyes is attached to one or more anchor leg subassemblies.
1.2.2 BUOY TYPES. The following types of buoys are currently utilized in fleet
moorings:
1.2.2.1
Drum BUOY. This buoy is normally made of steel and is available in a
variety of sizes. The shape of the buoy resembles a drum, and it is
primarily used in smaller classes of moorings. The older standard design
has a paint or f i b e r g l a s s coating while the newer design has a
polyurethane coating. This type of buoy contains either a tension bar or
a hawsepipe (see Figure B-l).
Tension Bar. A tension bar is a steel bar which passes through the
q
center of the buoy with padeyes on top and bottom. The new
B-2
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