POWER PACKAGE
The power package (fig. 3-44) provides and
maintains the fluid pressure required by the hydraulic
cylinders to raise and lower the barricade stanchions. It
consists of a base weldment, gravity tank assembly,
control panel assembly, accumulator, motor controller,
pump, electric motor, electrical system, and piping
system.
The gravity tank assembly has a capacity of
approximately 125 gallons and is the fluid reservoir in
the power package assembly. Displaced fluid from the
cylinder assemblies is returned to the gravity tank, and
from there it is pumped back to the accumulator. The
gravity tank is welded steel, closed at the top and
bottom by flat plates. The top cover plate has an access
hole, which is covered by a cap plate and gasket held in
place by bolts. Tapped bosses welded to the cap plate
are for breather vents. A liquid-level gauge is connected
to the side of the gravity tank. An indicator plate is
attached to the tank at the level gauge to show the
proper fluid level.
The control panel assembly (fig. 3-45) is attached
to the gravity tank by four bolts.
The panel consists of the panel frame (1), two
piping support brackets (9), accumulator pressure
gauge (6), pressure sensing switch (7), gauge valve (3),
air-charging valve (5), vent valve (2), air supply valve
(4), caution plate (8), and operating instruction plate
(10). Necessary copper tubing and sil-braze fittings
connect the panel to the accumulator assembly, to a
ship's exhaust line, and to the ship's high-pressure air
supply line. The accumulator pressure gauge (6) is used
to indicate pressures ranging from 0 to 2,000 psi in the
accumulator.
The pressure-sensing switch (7) is a piston type,
contained in a splashproof housing. It is connected to
the pressure line from the accumulator with a threaded
adapter and a coil of tubing between the adapter and tee
in
the
pressure
line.
The
function
of
the
pressure-sensing switch is to maintain accumulator
pressure between 1,250 psi and 1,500 psi. It does this
by opening or closing to stop or start the pump motor.
3-42
1
8
2
9
4
5
7
6
10
3
AIR SUPPLY
AIR CHARGING VALVE
VENT VALVE
CAUTION
ACCUMULATOR PRESS
GAUGE VALVE
1. FRAME
2. VENT VALVE
3. GAUGE VALVE
4. AIR SUPPLY VALVE
5. AIR-CHARGING VALVE
6. ACCUMULATOR PRESSURE GAUGE
7. PRESSURE-SENSING SWITCH
8. CAUTION PLATE
9. BRACKET
10. INSTRUCTION PLATE
ABEf0345
Figure 3-45.—Control panel assembly.
