28 July 2005
Piers and wharves for floating drydocks are constructed and equipped to permit overhaul of
ships above and below the waterline. Some floating drydocks have portal cranes on tracks on
the wingwalls and some floating drydocks use cranes from the pier side. The dredge depth at
these facilities must accommodate the floating drydock when submerged. Floating Drydocks
are normally moored using two or more vertical spuds that maintain the horizontal position of
the dock throughout its full range of vertical movement from fully submerged to fully
dewatered. The pier/wharf structure must be designed to accommodate mooring spud
placement and loading. The pier or wharf layout should also consider personnel, material, and
vehicle access to the drydock pontoon deck when the drydock is in the raised (dewatered)
Type IV Specialized.
Magnetic Treatment and Electromagnetic Roll piers.
These are piers that moor ships over an array of underwater instruments and large-area cable
solenoids used specifically for removing and/or modifying the magnetic signature
characteristics of surface vessels and submarines, as well as calibrating the on-board
degaussing systems of mine countermeasure vessels. Magnetic Treatment facility designs
vary using slips, T-piers, or single piers depending upon location and requirement. Magnetic
Treatment piers designed to accommodate surface vessels are typically configured as T-
shapes; whereas, submarines and mine countermeasure vessels are typically treated at drive-
in piers built in parallel configurations.
Training, Small Craft, and Specialized Vessels.
These piers and wharves are typically light structures designed for specific but limited
functions. Specific requirements are usually provided by the activity. Additional guidance can
be found in UFC 4-152-07N.
FLEXIBILITY OF BERTHS.
Typically, piers and wharves are designed to provide space, utility service, and other
supporting facilities for specific incoming or homeported ships. However, berthing plans and
classes of ships berthed change with time. While it is not economically feasible to develop a
single facility to accommodate and service all classes of ships presently known, design the
facility with a certain amount of flexibility built in for anticipated future changes in the functional
requirements. This is especially true for berthing piers and wharves that will be used to
accommodate different classes of ships as well as support a variety of new operations.
APPURTENANCES AND FEATURES.
The following is a range of appurtenances and features that may be required for piers and
Mooring devices to safely secure the ship.