15 August 2002
SHOP FACILITIES. Locate a drydock near yard supporting industrial
shops, or vice versa, from which material requiring fabrication or manufacture may be
LAYDOWN SPACE. Provide ample space on both sides of a drydock. If
there are no restrictions, furnish a strip at least 76.2 m (250 ft) wide on each side of the
drydock coping and at the head end.
POWER AND UTILITIES. Proximity to sources of power and utilities is
desirable but seldom a determining factor. Electricity, fresh water, saltwater fire
protection, compressed air, steam, oxygen, acetylene, and sewers are usually required
as described in Chapter 8.
CRANE AND CRANE TRACKS. Captive cranes should not be used if it
can be avoided. Trackage should be interconnected for portal crane utilization
elsewhere in the same yard.
SHIP APPROACHES. Maneuvering a ship into a drydock necessitates
careful attention to the shape of the approach body of water, locations of ship channels,
prevailing winds, currents, and relationship to other waterfront structures.
Turning Basins. A ship must parallel the long axis of a drydock before it
enters; therefore, provide a turning basin of appropriate width, length, and depth of
water outboard of a drydock entrance.
Measurements. The length and depth of a drydock are indicative of the
maximum ship to be accommodated. Use these measurements to define the size of a
Width. The turning basin should have a width outboard of the drydock at
least two times the dock length and properly shaped for turning.
Depth. The depth of water in the turning basin should be no less than that
at the entrance sill of the drydock.
Allowance for Turns. Where piers or other structures extend into a
waterway and flank the approach to a drydock entrance, the turning basin should be
large enough to allow a ship to be turned before coming abreast of such flanking
Clearance. A drydock must not be located where flanking structures are
too close to the path of a ship entering or leaving the drydock. Leave room for tugs to
operate beside a ship until it is clear of the drydock entrance. The distance between
such structures and the side of the ship path should not be less than 45.7 m (150 ft).