from any service pump in either pump room to any
service station on the flight or hangar decks.
Service station risers extend upward from the out-
board distribution main to supply the service stations
on the hangar and flight decks. At the service station,
the supply riser branches off to each hose reel.
Isolation valves are installed at strategic points
throughout the outboard distribution piping. These
valves are normally in the open position during at-sea
operations, but are closed to isolate specific sections
in an emergency or if damage occurs. They are lo-
cated in both the outboard distribution main and the
service station risers.
Jet Test System
This system provides JP-5 to the Jet Engine Test
Facility located on the fantail of aircraft carriers. The
system has its own pump and filter/separator. Supply
to this system is from the JP-5 service-pump suction
header. The system has a return line from the test
stand to permit operation of jet engines at various
Auxiliary JP-5 System
This system provides JP-5 to emergency diesel
generators, auxiliary boilers, small-boat filling sta-
tions, or combat vehicle/support equipment filling
station. It is an independent system and typically con-
sists of an auxiliary pump, an auxiliary main and
branches supplying each station. This system is also
supplied from the JP-5 service-pump suction header.
JP-5 FUELING SYSTEM COMPONENTS
LEARNING OBJECTIVE: Identify the various
components that make up the JP-5 below decks
fueling system. Describe their function, princi-
ples of operation, and operating limits.
In the first section of this chapter, we talked about
JP-5 fueling subsystems. We discussed their typical
arrangements and where pumps, filters, cutout valves,
purifiers, and other components would fit in that sys-
tem. And as was stated earlier, though all JP-5 fueling
system arrangements are alike the actual makeup of
each system will be different.
In this section, we identify and describe specific
components of the JP-5 fueling system. We cover
their description, operating capacities, some trou-
bleshooting and maintenance, and where they would
typically fit in a subsystem. Remember, your individ-
ual systems may vary.
A pump is a machine that draws a fluid into itself
through a suction port and forces the fluid out through
a discharge port. The ABF uses pumps in the JP-5
below decks system to move JP-5 from tank to tank,
and to lift JP-5 to the flight and hangar deck refueling
Wear occurs in a pump as in any other piece of
machinery. To maintain a pump at or near the effi-
ciency it had when new and to keep maintenance at a
minimum periodic tests should be made to determine
the delivery capacity of the pump. When a test indi-
cates a noticeable reduction in the delivery capacity,
it is a sign of possible internal wear. The pump should
be opened for inspection in accordance with PMS. If
corrective action is not immediately taken total fail-
ure of the wearing parts may result in excessive repair
costs as well as considerable down time of the pump.
Always follow the manufacturers instructions in the
applicable technical manuals. The various type
pumps and their functions are discussed here.
Due to their simplicity and adaptability to a wide
variety of operating conditions, centrifugal pumps are
widely used. They can be modified to operate over a
wide range of heads, can handle liquids at all normal
temperatures, and operate at speeds that are standard
for motors or turbines. The characteristics of these
pumps are such that liquid flow from them is continu-
ous, and their discharge can be throttled without
building up excessive pressures in the pumps or over-
loading the driving unit.
The most common manufacturers of the centrifu-
gal pumps used in the JP-5 below decks system are
Aurora and Carver. The Aurora is the pump discussed
here. But, there are other pumps installed and you
should always consult the technical manual for details
on the specific pump in your system.
The primary use of centrifugal pumps in the JP-5
below decks system are as service pumps. The Aurora
JP-5 Service Pump is a double-suction, single-stage,
centrifugal pump. The pump is designed to deliver
fuel at 1,100 gallons per minute at 150 psi with a