FLUID STOWAGE SYSTEM
A fluid stowage system (fig. 3-11) is provided to
stow fluid from the arresting engine during
maintenance and to transfer fluid back to the engine
after maintenance is complete. The fluid stowage
system consists of one common, steel stowage tank that
serves all the arresting engines installed on a particular
ship. It is equipped with piping valves from the
accumulator to the stowage tank.
The capacity of the fluid stowage tanks is 700
gallons. The stowage tank is capable of storing all the
fluid in the system of one arresting engine. Ship's
low-pressure air is used to force the fluid to and from
the stowage tank. A pressure relief valve, which is set at
120 psi, is provided to prevent excessive pressure
buildup. The relief valve is located on the stowage tank.
In addition, a 90-gallon stowage tank is installed on
each side for the port and starboard sheave damper
assemblies. The 90-gallon stowage tank is a repository
to transfer and replenish hydraulic fluid for the sheave
FLUID RECLAMATION SYSTEM
The fluid reclamation system (fig. 3-12) provides a
means of reclaiming hydraulic fluid removed from any
engine due to venting or through leaks or spills. The
fluid reclamation system consists of a stainless steel
90-gallon tank located in close proximity to the fluid
stowage tank, a centrifugal 1/3 hp pump, filter and
reclamation tank to the existing stowage tank line.
During fluid transfer from the reclamation system,
hydraulic fluid is filtered to ensure that only clean
uncontaminated fluid enters the fluid stowage tank.
During continuous arresting operations, the engine
fluid temperature rises because of friction of the fluid
moving through the engine, control valve, and piping.
To maintain extended pendant engine operation, the
fluid temperature is reduced by the fluid cooler. (See
fig. 3-13.) The maximum operating temperature for the
arresting engines is 170ºF. Prolonged operation at this
temperature limit is not recommended.
The fluid cooler is mounted in saddles on top of the
engine structure adjacent to the accumulator.
Fluid coolers are used on all Mk 7 arresting engines
serving a pendant engine. Engine fluid, as it is returned
from the accumulator to the main engine cylinder
during retraction of the engine, flows through the fluid
cooler body. Heat from the engine fluid is transferred to
cool service water (salt water) flowing at 100 gallons
per minute through tubes within the cooler body.
(SET AT 120 PSI)
Figure 3-11.Fluid stowage systemsecured condition.