CHAPTER 2 ANCHORING AND MOORING EQUIPMENT
Section I. Description and data
This system provides, when required, a four-point anchoring system to hold the barge in a fixed offshore position
while processing water and for mooring the barge at pierside or to another vessel. The installation is shown on drawings
listed in Appendix A.
Anchoring system has four electrically powered winches, two on the bow and two on the stern, each with 600 feet
of 1-inch wire rope (cable) hooked to a 1 000-pound Danforth type anchor. Winches have both manually and electrically
Each winch is powered by a 10 hp Dresser electric gear motor in a totally enclosed housing specifically designed
for maritime use. For added protection against moisture and corrosion, the motor has an internally mounted 120 V,
single phase electric space heater that will maintain internal temperature between 38 to 55 degrees F depending upon
outside ambient temperature. This motor drives the winch through a drive chain and gears which are running in lubricant
in a sealed housing on the side of the winch frame.
Within the motor housing is a Stearns 105 ft-lbs self-adjusting electric disc brake. This brake is always on except
when voltage applied to a solenoid depresses the spring and allows the disc and motor to turn freely. For anchor winch
manual operation (without power), this solenoid operated electric brake is manually turned off. This brake has a 120 V,
25-watt space heater to minimize adverse effects of condensation. To work in a saltwater atmosphere, this brake has
naval brass friction discs instead of the usual fiber discs.
Each winch is designed so reeling-in action pulls cable onto the drum underside (bottom-spooling) and is
equipped with a heavy duty levelwind assembly to ensure proper spooling of cable. To assist in spooling cable onto the
nongrooved drum, each winch uses only "right-lay" cable (wire rope).
Each winch has electrical controls including an ON/OFF switch, an OUT button, an IN button, a STOP button,
and a RESET button. Manual controls provide for engaging/disengaging levelwind mechanism, operating manual drum
brake, and selecting either manual or electrical power for the winch.
The manual method of operating the winch, when selected, may be used to allow anchor to free-fall. This is not
recommended. For cautions, see paragraph 2-12. Anchor cannot be manually retrieved with this system. With two ship
service generators providing electrical power, a manual backup system with full capability is not considered necessary.
Each winch cable passes through a fairleader before attaching to the anchor. This prevents the anchor cable
from becoming entangled with other equipment on the weatherdeck.
Anchoring and mooring system components are listed in Tables 2-1 and 2-2.
Capabilities. When the seabottom provides firm anchor holding, this equipment is capable of holding the barge
in an offshore position in a Sea State 3 condition in depths not exceeding 50 feet. Sea State 3 is defined as moderate
seas, with waves of 3 to 5 feet and wind velocity of 11 to 16 knots.
Electrical power must be available for complete operation of anchor winches.
Barge anchoring system may not hold barge in position if water depth exceeds 50 feet. See TM 55-1930-
20914&P-1 for details.