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46 CFR Ch. I (10104 Edition)
§ 58.2560
(f) When, in a vessel of less than 1,600
gross tons, an auxiliary steering gear,
which § 58.2510(c)(3) requires to be op-
erated by power, is not operated by
electric power or is operated by an
electric motor primarily intended for
other service, the main steering gear
may be fed by one circuit from the
main switchboard. When such an elec-
tric motor is arranged to operate an
auxiliary steering gear, neither § 58.25
25(e) nor paragraphs (a) through (c) of
this section need be complied with if
both the overcurrent protection and
compliance with §§ 58.2525(d), 58.2530,
and 58.2570 (j) and (k) satisfy the Com-
manding Officer, Marine Safety Center.
§ 58.2560
Non-duplicated hydraulic
rudder actuators.
Non-duplicated hydraulic rudder ac-
tuators may be installed in the steer-
ing-gear control systems on each vessel
of less than 100,000 deadweight tons.
These actuators must meet IMO As-
sembly Resolution A.467(XII), Guide-
lines for Acceptance of Non-Duplicated
Rudder Actuators for Tankers, Chem-
ical Tankers, and Gas Carriers of 10,000
Tons Gross Tonnage and Above But
Less Than 100,000 Tonnes Deadweight,
1981, and be acceptable to the Com-
manding Officer, Marine Safety Center.
Also, the piping for the main gear must
comply with § 58.2510(e)(3).
§ 58.2565
Feeder circuits.
(a) Each vessel with one or more elec-
tric-driven steering-gear power units
must have at least two feeder circuits,
which must be separated as widely as
practicable. One or more of these cir-
cuits must be supplied from the ves-
sels service switchboard. On a vessel
where the rudder stock is over 23 centi-
meters (9 inches) in diameter in way of
the tiller, excluding strengthening for
navigation in ice, and where a final
source of emergency power is required
by § 112.055(a) of this chapter, one or
more of these circuits must be supplied
from the emergency switchboard, or
from an alternative source of power
that
(1) Is available automatically within
45 seconds of loss of power from the
vessels service switchboard;
(2) Comes from an independent source
of power in the steering-gear compart-
ment;
(3) Is used for no other purpose; and
(4) Has a capacity for one half-hour of
continuous operation, to move the rud-
der from 15
° on either side to 15° on the
other in not more than 60 seconds with
the vessel at its deepest loadline draft
and running at one-half maximum
ahead service speed or 7 knots, which-
ever is greater.
(b) Each vessel that has a steering
gear with multiple electric-driven
power units must be arranged so that
each power unit is supplied by a sepa-
rate feeder.
(c) Each feeder circuit must have a
disconnect switch in the steering-gear
compartment.
(d) Each feeder circuit must have a
current-carrying capacity of
(1) 125% of the rated full-load current
rating of the electric steering-gear
motor or power unit; and
(2) 100% of the normal current of one
steering-gear control system including
all associated motors.
§ 58.2570
Steering-gear control sys-
tems.
(a) Each power-driven steering-gear
system must be provided with at least
one steering-gear control system.
(b) The main steering gear must be
operable from the pilothouse by me-
chanical, hydraulic, electrical, or other
means acceptable to the Commanding
Officer, Marine Safety Center. This
gear and its components must give full
followup control of the rudder. Supple-
mentary steering-gear control not giv-
ing full followup may also be provided
from the pilothouse.
(c) Each steering-gear control system
must have in the pilothouse a switch
arranged so that one operation of the
switchs lever automatically supplies
power to a complete system and its as-
sociated power unit or units. This
switch must be
(1) Operated by one lever;
(2) Arranged so that not more than
one control system and its associated
power unit or units can be energized
from the pilothouse at any one time;
(3) Arranged so that the lever passes
through
off during transfer of control
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