Various components/devices installed in the
The shipboard FO system is basically a
system will assist you in this duty. We will
method of receiving, storing, purifying, and
describe a few of these aids in the following
removing FO from the ship. The bulk FO is stored
paragraphs.
throughout the ship in storage tanks. The FO is
then taken from the storage tanks through the
A liquid sight indicator (fig. 4-2) is provided
transfer system to the service tanks. The transfer
at each main bearing. Each indicator has a
system removes water and contaminants from the
fitting with a bull's eye through which you
FO and prepares it for use in the GTE. The
can see a stream of oil flowing from the bearing,
service tanks stow the FO either in use or FO
a fitting for a dial-type thermometer, and a well
ready to be used in the engines. The FO is taken
for installation of remote reading RTEs.
from the service tanks, through the ship's FO
service system where it is further conditioned
Lube oil pressure at the inlet to the header is
before use.
sensed by both a pressure transducer and a
The fuel, naval distillate, and JP-5 fuel oil
pressure switch. The transducer sends signals to
systems are separate systems. Both have the FO
ECSS for METER/DDI display, pump logic
fill and transfer system and the FO service system.
operation, data logging, and HEADER PRESS
We will discuss these systems separately in the
HI/LO alarming at the PAMCE and the PLOE.
following sections.
The pressure switch provides the permissives for
the turning gear and GTE starting.
NAVAL DISTILLATE SYSTEM
Most remote bearing LO pressure is sensed by
a transducer located at the lower outboard first-
Fuel, naval distillate is the FO used for the
reduction gear bearing.
main propulsion plant and generators on the CG-,
DD-, and FFG-class ships. Naval distillate
A temperature switch, located in the clutch/
is the main type of FO carried aboard ships and
brake oil inlet, is set to open contacts at 130F
used in the FO fill and transfer and the FO
to prevent clutch/brake operation. A temperature
service system.
sensitive bellows actuates a switch to open or close
electrical contacts at the set point.
Fuel Oil Fill and Transfer System
A temperature transducer, located at the
inlet to the header, will provide you with both
The FO fill and transfer system for F-76 has
meter displays and a HEADER TEMP HI/LO
a fill and transfer header, storage tanks, and a
alarm at the PAMCE and the PLOE.
transfer system. We will discuss these individually
in the following paragraphs.
FUEL SYSTEMS
THE FUEL OIL FILL AND TRANSFER
HEADER. --The fill and transfer header is a
The gas turbine ships carry two types of FO
system of piping and valves connecting the main
aboard-fuel, naval distillate, NATO symbol F-76
deck filling stations to the storage tanks. This
(formerly designated as diesel fuel, marine
system allows FO to be taken from the storage
(DFM)), and JP-5, NATO symbol F-44. Fuel,
tanks to the service tanks. It also provides the
naval distillate is identified as MIL-F-16884.
capability to defuel the ship.
Fuel, naval distillate is the type of FO normally
Fueling and defueling operations begin at the
used for the GTEs, with JP-5 being an alternate
main deck fueling stations. Gas turbine ships have
FO that can be used when necessary. While JP-5
fueling stations on the port and starboard sides
may be used for the ship's propulsion plant, its
forward and aft.
main purpose is for use in the helicopter assigned
to the ship for antisubmarine warfare (ASW)
Ships are fueled both at sea and in port. The
operations. Both of these FOs must be delivered
main difference between fueling at sea and in port
to the equipment in a clean and water-free state.
is the method used to connect the supplying
This is the purpose of the ship's FO system.
station to the ship. At sea the probe fueling system
4-11
