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2B > CO2 > Flashcards

CO2 Flashcards

1
Q

Expansion rate

A

450:1

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2
Q

Air housing plenum tempature

A

225*F

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3
Q

Oil storage/oil purification/emergency diesel tempature

A

160*F

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4
Q

Characteristics

A 
Colorless
Heavier than air/Displaces oxygen
Inert gas
Clean/No residue
Odorless
Seeks lowest level
Non corrosive
Non conductive
Non deteriorating
Non flammable
Non toxic
Non poisonous
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5
Q

CO2 Tank
High and Low Alarms
High and Low pressure switches

A

6 ton storage unit (12,000 lbs)
high pressure 350 psi, low pressure 275 psi
6-18 psi min,

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6
Q

CO2 system manufacture

A

Ansul preferred

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7
Q

What type of CO2 system do we have

A

Low Pressure Carbon Dioxide Fire Suppression System

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8
Q

CO2 Pressure Vessel

A

4 inches of insulation
insulation is covered with Aluminum vapor barrier
vessel is provided in a saddle mount configuration

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9
Q

What temp and psi is CO2 stored at

A

295 psi to 305 psi
the compressor turns on at 305, off at 295
0* F

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10
Q

CO2 tank dimensions

A 
15'10" L
5'10" W
8'6" H
9000lb empty weight
1541 gallons
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11
Q

Bleeder valve

A

opens at 330psi

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12
Q

Main safety relief valve

A

set to 350psi

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13
Q

The CO2 system consists of

A 
low pressure storage unit
master valves
selector valves
manual & automatic controls
distribution nozzles
alarms
indicators
supervisory devices
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14
Q

master and selector valve

A

a ball or butterfly valve (depending on piping size)
pneumatic operator - 100 psi operating (150max/80min)
spring return to closed
electrically operated solenoid valve
30sec time delay open solenoid valve (3 rooms)

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15
Q

purpose of the listed and approved releasing control panel

A

to provide automatic detection and control

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16
Q

lock out valve with supervisory switch

A

manual lock out valves
1/2 - 2” normal
3-8” has high visibility position monitor & handwheel (oil storage room and main tank)

17
Q

pressure relief valves

A

150 psi in actuation line
450 psi in piping where trapped CO2 could exist
350 psi on main tank

have filter to keep from getting clogged

18
Q

actuation line supervisory pressure switch

A

2 level, self restoring pressure switch
installed at most remote point in system
1st contact closes at 80 psi
2nd contact closes at 70psi

19
Q

if CO2 loses power does it still work?

A

yes 2 12V 50AH battery backup

20
Q

in closed state, the following zones dump co2

A

everywhere - discharge pressure switch, manual pull station, heat detectors, turn knobs
units also have phase differential relay while running

21
Q

CO2 density

A

1.5 times as dense as atmospheric air

22
Q

% CO2 concentration that will not support combustion

A

15.6%

23
Q

1 lb CO2

A

100% concentration in 9 ft^3

50% concentration in 20 ft^3

24
Q

pressure required to lift relief dock

A

.217 psi

25
Q

lbs of CO2 for a unit dump

A

3492lbs total
2192lbs initial - 150 sec - 880lbs/min
1300lbs extended over 20 min

26
Q

initial and extended release valves open at

A

same time

27
Q

nozzles per unit

A

8 initial

4 extended

28
Q

volume of air in thrust housing

A

22,000 ft^3

29
Q

initial discharge design description

A

the generator system is designed to achieve 50% concentration within 7 mins at a flow rate to achieve at least 30% concentration within 2 mins
required by NFPA standard 12 for deep-seated hazards

30
Q

oil storage/oil purification/emergency generator only have

A

initial release, no extended - 1 minute dump
30 second time delay
louvers and doors close after 30 seconds

31
Q

oil storage size/detector/nozzles

A

26,000 ft^3 1820lbs
8 @ 160*F
26 nozzles

32
Q

oil purification size/detector/nozzles

A

6700 ft^3 469lbs
4 @ 160*F
9 nozzles

33
Q

emergency diesel size/detector/nozzles

A

12,050ft^3 845lbs
3 @ 160*F
13 nozzles

34
Q

oil storage/oil purification/emergency generator are considered

A 
surface fire class B hazard
designed to achieve 34% concentration within 1 min
35
Q

loss factors

A

units use 1.2

3 rooms use 1.4

2B (3 decks)

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