UFC 4-213-10
15 August 2002
8-4.6.3
Insulation. Steam lines must be thoroughly insulated from source to
outlets.
8-4.7
Compressed Air. Compressed air is required in a graving dock for tools
and sandblasting.
8-4.7.1
Quantity. Determination of required quantities is dependent on the
operations to be performed and ranges from 1.65 to 3.78 m3/s (3,500 to 8,000 ft3/min)
for small and large docks, respectively.
8-4.7.2
Mains. All classes of graving docks should have mains on both sides of
dock.
8-4.7.3
Outlets. Base number and location of outlets on service air requirements
for hull maintenance. Provide a suitable flanged valve provided with a blind flange for
each branch outlet. Do not use plug valves
8-4.7.4
Size of Main and Outlets. Size of mains and outlets shall be as follows:
Dock:
Main
Outlet
Submarine and Destroyer
101.6 mm (4in)
63.5 mm (2-1/2 in)
Cruiser
152.4 mm (6 in)
63.5 mm (2-1/2 in)
152.4 mm (6 in)
63.5 mm (2-1/2 in)
Auxiliary
Carrier
152.4 mm (6 in)
76.2 mm (3 in)
8-4.7.5
Piping and Fittings. Piping and fittings shall conform to the requirements
of MIL-HDBK-1003/8 Exterior Distribution of Steam, High Temperature Water, Chilled
Water, Natural Gas and Compressed Air.
8-4.7.6
Air Pressure. Air pressure at branch outlets should be 689.47 kPa (100
psi) unless otherwise specified in project criteria. High-pressure air for testing (20684 to
31026 kPa) (3,000 to 4,500 psi) should be described in project requirements and may
be portable equipment.
8-4.8
Wheeler System. The Wheeler system is used to loosen and remove
sludge and residue from ship's oil tanks while the vessel is in drydock. The Wheeler
unit consists principally of a railroad flatcar or barge with four tanks and two pumps
mounted on it. Connections between the flatcar or barge and ship services are made
through a manhole called a Wheeler manhole. This manhole contains a 44.4 mm (1-3/4
in) washdown line, a 101.6 mm (4 in) suction line, a 44.4 mm (1-3/4 in) steam line, and
a 50.8 mm (2 in) fresh waterline.
8-15
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