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MM1 CH 588 Aircraft elevator > CH 555 - SURFACE SHIP FIREFIGHTING > Flashcards

CH 555 - SURFACE SHIP FIREFIGHTING Flashcards

1
Q

Fire zone boundaries confine a fire within a zone and provide protected staging areas
for

A

fire parties

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2
Q

The minimum tightness for a fire zone boundary is

A

fume tight

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3
Q

Recent ship designs have fire zone boundaries fitted with a fire insulation on one side that will retard heat transfer
from a fire on the insulated side for a minimum

A

30 minutes

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4
Q

The single-sided fire insulation system does not

A

retard heat transfer from a fire on the uninsulated side.

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5
Q

At repair party leader discretion, manning of fire boundaries may be

A

reduced where fire insulation is installed on the fire side.

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6
Q

What should also be secured to avoid the spread of smoke and fire to surrounding compartments.

A

Recirculation systems and air conditioning
systems

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7
Q

When a naval ship is put in material condition ZEBRA for
battle, most of the ventilating ducts are

A

closed

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8
Q

The firemain system is designed for maximum damage resistance with the following survivability features:

A

a. Multiple, independent pumps
b. Redundant seawater paths
c. Ability to segregate sections
d. Separation of redundant components
e. Resistance to shock
f. Capability for remote operation

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9
Q

This firemain consists of two single mains separated athwartship
as far as practicable, extending fore and aft on the damage control deck.

A

Horizontal loop system

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10
Q

This firemain consists of two single mains installed fore and aft in
an oblique (e.g. angled) plane, separated both vertically and athwartship, connected at the ends to form a loop

A

vertical offset loop system

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11
Q

This firemain consists of two service mains installed on the damage control
deck and separated athwartship, and a bypass main normally installed on a lower level near the centerline

A

composite system

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12
Q

What is installed in the discharge line for each fire pump to prevent back flow through the pump, to prevent the rotating assembly from rotating opposite of design and to prevent subsequent loss of firemain pressure in the
event of pump failure or inadvertent pump shutdown

A

Check Valve

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13
Q

To prevent overheating during low flow conditions, each
fire pump is equipped with what inwhich connects the pump discharge to either the pump suction line or overboard,

A

recirculation line

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14
Q

What permit isolation of
the pumps from the sea and the firemain for damage control purposes, and permit pump maintenance

A

valves

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15
Q

Fire pump is equipped with an orifice sized to pass approximately

A

5% of the pump’s rated capacity

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16
Q

Each discharge recirculation line for turbine driven centrifugal
fire pumps is fitted with a relief valve set at

A

125% of the firemain’s rated pressure.

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17
Q

Pumps are located below the water
line to provide a minimum positive static head of

A

3 feet under all conditions of load and a list of up to
15 degrees.

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18
Q

The standard fire pump can be procured in horizontal configurations
with how many interchangeable impellers to achieve various pressure heads and flow capacities

A

6

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19
Q

The Navy standard fire pump (NSTFP) is an electric motor
driven centrifugal, close coupled pump of what kind of material

A

titanium

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20
Q

The centrifugal pump design of the NSTFP is particularly suited for firemain service because

A

it will deliver a wide range of flow rates within a relatively narrow pressure range

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21
Q

The pump zero flow, or shutoff
head is limited to approximately

A

1.2 times its rated head to prevent large fluctuations in firemain pressure as
seawater demand varies and to prevent excessive firemain design pressure

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22
Q

Electric motors are preferred
over steam turbine drives because they are

A

a. more reliable because of less moving parts,
b. require less maintenance,
c. provide rapid start and stop control, and
d. are easier to install

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23
Q

A major disadvantage of motor driven pumps is that they often operate near their shutoff head
because

A

they operate at constant speed

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24
Q

What is the backup for firemains which have turbine driven fire pumps,

A

steam supply is a backup
to electric power for firemain supply.

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25
Q

The flushing lines should be opened periodically to flush out any debris and

A

prevent excessive pressure loss through the strainer.

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26
Q

Y-type strainers are installed in firemain branch lines for services such as AFFF to protect

A

the control valves of these systems

27
Q

Suction lines of the fire pumps are protected by

A

hull plate strainers

28
Q

Due to weight
saving advantages, high performance butterfly valves are allowed as WILLIAM cutout valves for sizes

A

of 2-1/2 inches and above

29
Q

What installed on the discharge side of centrifugal
fire pumps, to prevent back flow and resultant reverse rotation of secured pumps

A

check valve

30
Q

When firemain pressure increases
because of low demand from installed services, the pressure regulating valve will

A

open to divert flow overboard

31
Q

As
firemain pressure drops due to additional services being energized,

A

the flow overboard is reduced

32
Q

Which valves are installed on the recirculation line downstream from turbine driven
pumps.

A

Relief valves

33
Q

A combination vacuum and pressure gage is installed on the

A

suction piping of each fire pump.

34
Q

On a fire pump, the pressure gage is installed on the

A

discharge piping

35
Q

The authority to start or stop fire pumps resides
with

A

the Engineer of the Watch (EOOW) underway, and the Duty Engineer in port.

36
Q

A medium or small firemain break and or when the intended service being placed on line will be noticed by the as

A

a drop in pressure

37
Q

The firemain should be operated at

A

the lowest pressure sufficient to meet the
needs of the connected services

38
Q

During operation, a pressure increase in the firemain will be due to a pump being started or

A

service being secured

39
Q

At extremely high flow rates, the pump may

A

cavitate and lose suction

40
Q

To raise the firemain
pressure, place additional pumps on line or

A

secure services

41
Q

The automatic sprinkling systems are
equipped with

A

flow switches.

42
Q

When pressure is regained, the rupture or ruptures will be downstream
of the

A

last valve closed

43
Q

Pipe sizes are based on

A

copper-nickel pipe

44
Q

The valve(s) in the AFFF concentrate suction line(s) when the firemain is
returned to service should be

A

open

45
Q

Fixed AFFF sprinkling systems, the high capacity AFFF stations supply
various

A

1-1/2 and 2-1/2 in AFFF hose station

46
Q

AFFF service outlets installed for below decks use are
equipped with

A

a 1-3/4 inch or 1-1/2 inch hose (50 - 175 feet)

47
Q

Navy standard fire hose

A

150ft

47
Q

The flow rate setting for the
1-1/2 inch nozzle is

A

125 gpm (95 gpm in machinery spaces.)

48
Q

The flow rate for the 2-1/2 inch AFFF nozzle is

A

250gpm

49
Q

Each washdown/firefighting zone supplies up to

A

1,000 gpm of seawater/AFFF

50
Q

Overhead AFFF sprinkling systems are installed to extinguish

A

class B pool fires located on the deck

51
Q

On the AFFF hose station, the pushbuttons are enclosed in a watertight boxes with hinged covers painted

A

red/green strips

52
Q

A power distribution
system is provided for electrical control of the AFFF proportioning system. The electrical system is divided into
several units, consisting of

A

2 to 21 distribution centers

53
Q

Root valves in the firemain branches to the AFFF proportioner stations are classified
WILLIAM and

A

shall be kept open at all times.

54
Q

A bell switch may be provided at each outlet for ringing the injection station to man up the

A

X50J

55
Q

Carbon dioxide (CO2) is a colorless, odorless gas that is naturally present in the atmosphere
at an average concentration of

A

0.03%

56
Q

The amount required to extinguish fire with CO2 concentrations is

A

30 to 70 percent

57
Q

Carbon dioxide for fire fighting is maintained as a liquid

A

at high pressure

58
Q

At the concentrations
expected after discharge of CO2, Dizziness, increased respiration rate and headaches will occur at low
concentrations and loss of consciousness will occur in less than

A

15-35 seconds

59
Q

Each
system is designed such that a single discharge of Halon 1301 will provide a concentration of

A

5 to 7 percent halon 1301

60
Q

Sufficient
Halon is required so that the concentration will remain at a minimum of 5 percent for

A

15 minutes

61
Q

HFP
systems for spaces with diesel, JP-5, or gasoline fuels are designed such that a single discharge will provide a
minimum average concentration of 8.5%, which must be maintained for

A

15 minutes

62
Q

The sprinklers are the
closed head type and will actuate automatically when exposed to heat, typically at

A

175 degrees

MM1 CH 588 Aircraft elevator (28 decks)

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