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 Ducting connects the tugs ventilation compartments for
it at 250 psi. The no, 2 switch starts its compressor at
air delivery.
240 psi and secures it at 250 psi. Compressors can be
b. Starting Crew's Quarters Supply Blower.
set to operate in either of the following methods: Both
automatic; one automatic one manual, or both manual.
(1) Inspect area and vents to assure they are
(1) Both compressors on automatic operation.
free of tools, waste, or material that could become
entangled with moving parts.
(a) Inspect area around compressors for
(2) Move switch (32, fig. 2-5) to ON position
loose gear, tools, and waste material that could become
and energize the ventilation system power control panel.
entangled in moving parts.
(3) Move line switch for crew's quarters supply
(b) Check crankcase oil level.
blower, located on ventilation system power control
(c) Align compressed air system valves as
panel to the ON position.
described in table 2-11 to accomplish required function.
(4) Press the START push switch which is
(d) Place switches (27 and 36, fig. 2-5) at
located in crew's quarters to start the blower.
main electrical control panel in ON position.
(5) Secure the blower by pressing the STOP
(e) Move both controller selector switch
push switch.
levers to AUTOMATIC position.
c. Starting Crew's Quarters Exhaust Blower.
(f) Press START push switch on each
controller. Compressors are now operative.
blower, located on ventilation system electrical power
NOTE
control panel, to the ON position.
If storage tanks are full with both
(2) Press the START push switch, located in
gages reading 250 psi, neither
crew's quarters, to start the blower.
compressor will start. If there is less
(3) Secure blower by pressing STOP push
than 250 psi, but not less than 230
switch.
psi pressure, only No. 2 compressor
d. Starting Galley Exhaust Blower.
will start.
(1) Move line switch for galley exhaust blower,
(2) One compressor on automatic operation.
located on ventilating system electrical power control
(a) Perform steps (1), (a), (b), and (c)
panel, to the ON position.
above.
(2) Press the START push switch located in
(b) Place switch of selected compressor on
galley to start blower.
main electrical control panel at ON (either 27, or 36, fig.
(3) Secure the blower by pressing STOP push
switch.
(c) Move selector switch lever on controller
e. Starting Engine room Supply Blower.
of selected compressor to AUTOMATIC.
(1) Move the line switch for engine room
(d)
Press the START push switch on
supply blower, located on the ventilation system
controller for selected compressor. If the no. 1
electrical control panel, to the ON position.
compressor was selected, and there is less than 230 psi
(2) Press the START push switch, located in
on gage, the compressor will start, then stop when
engine room, to start blower.
pressure gage reads 250 psi.
(3) Secure the blower by pressing STOP push
(3) Both compressors on manual operation.
switch.
(a) Perform steps (1), (a), (b), (c), and (d)
f. Starting Engine room Exhaust Blower.
above.
(1) Move the line switch for engine room
(b) Move selector switch lever on both
exhaust blower, located on the ventilation system
controllers to HAND position.
electrical control panel, to the ON position.
(c) Press START push switch on both
(2) Press the START push switch, located in
controllers. Compressors will start.
engine room, to start the blower.
(d) Secure both compressors when the
(3) Secure the blower by pressing the STOP
pressure gages read 250 psi by pressing STOP push
push switch.
switch.
g. Emergency Stopping of Blowers. In case of
emergency, ventilating blowers can be secured by
2-16. Ventilation System Operation
pressing one or more of the EMERGENCY STOP push
a. General. There are two supply and three
switches located in the passageway at the head of
exhaust systems installed on the tug. The crew's
engine room access ladder. If this station is not
quarters supply blower is rated at 3,000 cfm and is
accessible, all ventilation blowers may be secured by
driven by a 1-hp motor at 1,300 rpm. The crew's
pressing the EMERGENCY STOP push switch located
quarters exhaust blower is rated at 1050 cfm and is
in the pilot house.
driven by a 1/2-hp motor at 1,750 rpm. The engine
room exhaust blower is rated at 9,000 cfm and is driven
2-17. Electrical System Operation
by a 4 hp motor at 1,750 rpm. The engine room supply
a. General. The tugs service electrical system is
blower is driven by a 3 1/2 hp motor. The galley exhaust
blower is driven by a 1/2-hp motor at 1,350 rpm.
2-38
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