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TM 10-4930-239-12&P
Section III. PRINCIPLES OF OPERATION
1-11. THEORY OF OPERATIONS. The FSSP comprises a number of separate major components to store and dispense
fuel. The principles of operation of each of these major components and how they work within the system are defined in
the following paragraphs. (Refer to Figure 1-3.)
a. Fuel System. The FSSP is used to store and dispense fuel to using units in the field. A typical layout of the FSSP
is shown in Figure 1-3. Fuel enters FSSP through the wye and tee assembly (1), and it is moved into the three collapsible
fabric fuel tanks (2) by the first of two 350 gpm centrifugal pumps (3) or it may be moved by the fuel transporter or pipeline
pumps. A second 350 gpm pump (4) moves the fuel from the collapsible tanks (2) through the filter/separators (5) to the
quick acting valves (6), gate valves (7), and the nozzles (8).
b. Pumps. The 350 gpm centrifugal pump (3) is used on the receiving side of the FSSP to move fuel into the
collapsible tanks (2). An identical pump (4) is used on the delivery side of the FSSP to move the fuel from the tanks to the
various types of dispensing units.
c. Filter/Separator. Two 350 gpm filter/separators (5) may be connected in parallel on the delivery side of the system
to remove entrained water and solid contaminants from fuel before it is dispensed into vehicles or containers.
d. Tanks. Three collapsible fuel tanks (2) (any combination of 3,000, 10,000, or 20,000 gallon tanks may be used)
are used to store fuel received from fuel transporters or pipelines to be supplied to the dispensing units.
e. Fittings. There are several different types of fitting assemblies in the FSSP to connect hoses, valves, and
components together.
f. Hose Assemblies. There are two types of hose assemblies used in the system. The suction hose assemblies
have reinforcing wires spiraled throughout their length to keep the hose from collapsing and to act as a bonding wire. The
discharge hose assemblies are of a non-wire reinforced type but have bonding wires imbedded in the entire length of the
assembly.
g. Dispensing Nozzles. Three nozzles provide a means of refueling vehicles or filling cans and drums. The nozzles
are fuel and oil servicing, automatic shut-off for use with 1-1/2 inch or 1 inch hose. When 1 inch nozzles are required,
fittings are supplied to remove the 1-1/2 inch nozzles and replace them with 1 inch nozzles.
h. Dispensing Valves. Five quick acting valves are also provided for dispensing fuel to systems with various other
types of fuel connections. Three sizes of quick acting valves are provided; 1-1/2 inch, 2 inch, and 3 inch. When 4 inch
dispensing valves are required, the 4 inch to 3 inch reducer fitting on the 3 inch valve can be removed.
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