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Air Diving Supervisors QUESTIONS > Chambers > Flashcards

Chambers Flashcards

1
Q
  1. The minimum diameter chamber can be manufactured from 1 January 2015?
A

1500mm or 60” inches

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2
Q
  1. An air chamber has to have a minimum of how many compartments?
A

2 compartments

Which are the main and entry locks.

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3
Q
  1. A fixed bunk in a 1500mm or 60” chamber, should be how long?
A

1800mm

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4
Q
  1. Name 5 of the main classification societies for the chambers?
A
  • American Bureau of Shipping ( ABS)
  • Lloyds Register ( LR)
  • Det Norske Veritas (DnV)
  • Bureau Veritas (BV)
  • Germanischer Lloyd ( GL)
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5
Q
  1. What’s does the word BIB’s stand for?
A

Build in breathing system.

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6
Q
  1. What’s the percentage levels of Oxygen for combustion in the chamber?
A

6% or below - no combustion
6% to 16% - incomplete combustion
16% above - complete combustion

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7
Q
  1. How much breathing quality oxygen needs to be available for emergency diving treatment?
A

90m3 or 3200 cuft.

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8
Q
  1. View port should be replaced when?
A

Every 10 years. From fabrication date.

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9
Q
  1. DCI must be reported to?
    a) OIM or master of the vessel
    b) client rep
    c) safety manager
    d) project manager
A

a) OIM or master of the vessel

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10
Q
  1. You intend to pressurize the chamber from surface to 24 msw using 15/85 oxy/nitrogen. What will the PO2 be on arrival?
    a) 0.172 ba
    b) 0.51 ba
    c) 0.36 ba
    d) 0.57 ba
A

d) 0.57 ba

Remember there is already air in the chamber.
1——0.21
So, 2.4 x 0.15 = 0.36 + 0.21 = 0.57 ba

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11
Q
  1. A chamber has an 02 % of 16% at 30 msw. If it’s deco to 20 msw. What will the %O2 be?
    a) 14%
    b) 16%
    c) 28%
    d) 7%
A

b) 16%

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12
Q
  1. What was the PPO2 in the chamber with 16% when it was at 30 msw?
    a) 0.21 ba
    b) 0.42 ba
    c) 1.8 ba
    d) 0.64 ba
A

d) 0.64 ba

4 x 0.16 = 0.64 ba

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13
Q
  1. If the diver works hard soon after completing his decompression, would he?
    a) be more likely to suffer DCI
    b) be less prone to DCI
    c) risk of vestibular bend
    d) risk of emphysema
A

a) be more likely to suffer DCI

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14
Q
  1. How long should an air DDC normally be available after diving therapeutic use?
    a) 6h
    b) 8h
    c) 12h
    d) 48h
A

c) 12h

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15
Q
  1. What pressure would you set up a bibs air supplement regulator to a DDC at a depth of 38 msw?
    a) 3 bar
    b) 8 - 10 bar
    c) 38 bar
    d) 104 bar
A

b) 8 - 10 bar

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16
Q
  1. Before compressing chamber would you?
    a) test the bibs supply
    b) analyze all gas supplies
    c) check DDC inner and outer valve position
    d) all of the above
A

d) all of the above

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17
Q
  1. There is a delay in getting the diver into the DDC for surface deco, would you?
    a) treat him for DCI
    b) add the delay to first DDC stop
    c) add the delay to his bottom time
    d) double the first stop time
A

a) treat him for DCI

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18
Q
  1. What the cylinder colour coding for diving quality oxygen?
    a) all black
    b) grey with a black top
    c) white top
    d) grey with grey top
A

c) white top

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19
Q
  1. What’s the shoulder colour for a CO2 gas cylinder?
    a) grey top
    b) black top
    c) dark blue
    d) pink
A

a) grey top

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20
Q
  1. Which of the following is prohibited inside a DDC?
    a) toothpaste
    b) metal mirrors
    c) sugar granules
    d) Tego or panacide disinfectant
A

c) sugar granules

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21
Q
  1. Which has the greatest fire risk?
    a) dry welding habitat (heliox filled)
    b) surface oxy/arc
    c) surface welding
    d) dry welding habitat ( air filled)
A

d) dry welding habitat ( air filled)

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22
Q
  1. How long should you wait after an explosive misfire?
    a) at least 15 min
    b) at least 1h
    c) at least 30min
    d) at least 4h
A

c) at least 30min

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23
Q
  1. Chambers should be fitted with pressure relief valves which ?
    a) vent at 2 psi above ambient
    b) prevent medical lock being opened under pressure
    c) prevent over pressurisation of DDC
    d) allow divers to vent DDC
A

c) prevent over pressurisation of DDC

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24
Q
  1. HP oxygen to be reduced at the supply quad to no more than?
    a) 5 bar
    b) 10 bar
    c) 40 bar
    d) 80 bar
A

c) 40 bar U.K.

in Norwegian as low as possible

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25
Q
  1. A diver who surfaces uncontrollably from 36 msw should decompressed to?
    a) 50 msw on air
    b) 50 msw on O2
    c) 18 msw on O2
    d) 18 msw on air
A

c) 18 msw on O2

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26
Q
  1. What’s the lowest % of oxygen in a DDC. That will support complete combustion?
    a) 30%
    b) 16%
    c) 2%
    d) 100%
A

b) 16%

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27
Q
  1. A Chamber at a depth of 18 msw contained 19.8% O2. If vented to surface, what would the partial pressure O2 be?
    a) 0.0198 ba
    b) 0.198 ba
    c) 1.98 ba
    d) 19.8 ba
A

b) 0.198 ba

19. 8/100 = 0.198

28
Q
  1. What is the amount of gas taken to compress a chamber from 45 msw to 55 msw if the chamber FV is 8m3?
    a) 0.8 m3
    b) 8m3
    c) 1.8m3
    d) 2.8m3
A

b) 8 m3

29
Q
  1. A chamber contains 18%, what should the PO2 and % O2 be if vented to surface?
    a) 1.8 bar and 1.8%
    b) 1.8 bar and 18%
    c) 0.18 bar and 18%
    d) 0.18 bar and 1.8%
A

c) 0.18 bar and 18%

30
Q
  1. What IMCA recommended minimum quantity of pure oxygen, which should be kept in reserve in case of therapeutic treatment?
    a) 75 m3
    b) 80 m3
    c) 85 m3
    d) 90 m3
A

d) 90 m3

31
Q
  1. With a DDC in use, the medical lock should be ?
    a) kept to depth with both doors closed
    b) kept at atmospheric pressure with a exterior door open
    c) kept at depth with interior door open
    d) kept at atmospheric pressure with both doors closed
A

d) kept at atmospheric pressure with both doors closed

32
Q
  1. A Chamber has been pressurise to 50msw. First 10m on 18/82mix, from 10m to 25m with 16/84 mix, from 25m to 50m with 10/90 mix. What would be the final PPO2 of the the mix and percentage. Which law is applied in this example?
A

Remember chamber has already 1 bar and 0.21ppo2

                         0m
 1                 ————  0.21
                        10m
 1                ————- 0.18
                         25m
1.5 x 0.16 ———— 0.24
                         50m
2.5 x 0.10 ———— 0.25 = add all pp = 0.88ppo2

Percentage = 0.88/6 = 0.14666 x 100 = 14,6%

Dalton’s law applied in this example

33
Q

Who would have overall control over an injured diver in a deck decompression chamber?

a) the company medical advisor
b) the diver medic
c) the LSS
d) the diving supervisor

A

d) the diving supervisor

34
Q

Does an air chamber have to have an interlock device on its medical lock?

a) yes, in all cases
b) no, in some cases
c) maybe, depending on location
d) no, if it is next to the chamber controls

A

a) yes, in all cases

35
Q

Who can have a full control over an air chamber?

a) part 1 diver
b) LST
c) part 2 diver
d) a supervisor
e) all of the above

A

d) a supervisor

36
Q

A seriously ill or injured divers in a hyperbaric chamber, could be decompress or transferred when?

a) the supt agrees
b) evacuation could be complete in 12h
c) when his condition is stable
d) the diver medic agrees

A

c) when his condition is stable

37
Q

During saturation, chamber hygiene should be performed:

a. Twice a day at minimum
b. Minimum of every 24 hours
c. At bedding changes
d. Only when divers request it

A

b

38
Q

A smoulder fire occurs in a DDC. What should you instruct the diver to do?

a. Evacuate system
b. Divers on BIBS and try to extinguish the fire
c. Activate the deluge system
d. Extinguish the fire

A

b

39
Q

Under who’s DIRECT control should the decision be to open the supply valve to the BIBS system?

a. The Supervisor
b. The Life Support Supervisor
c. Divers in DDC
d. LST

A

c

40
Q

Any air diving chamber manufactured after 1 January 2015 should have a minimum internal diameter of 60 inches (1500mm). Air chambers manufactured before that date do not need to meet this size requirement.

True or False

A

True

41
Q

What are Dragger tubes? what are they used for?

A

They are also known as colorimetric tubes. They are widely used for carbon dioxide analysis in the diving bell and to test LP air supplies for contaminants.

42
Q 
IMCA state that maximum recommended PPO2 in a DDC is?
a 1.4 bar
b 1.6 bar
c 2.8 bar 
d 3.2 bar
A

c 2.8 bar

43
Q 
In an air chamber the % O2 should never be allowed to rise above?
a 25%
b 30%
c 21%
d 23%
A

d 23%

44
Q

Following a successful therapeutic treatment a diver should not fly until:

a. 12 hours after
b. 18 hours after
c. 24 hours after (flights below 600m altitude)
d. 48 hours after (all other flights)

A

d

Should specify!!!!
could be C or D

45
Q 
Of the following, which is most likely to create a problem with a diver
undergoing surface decompression?
a DDC temperature of 20ºC
b Communications failure
c Poor fitting BIB 
d Constant flushing of DD
A

c Poor fitting BIB

46
Q

Regarding to the proximity of DDC, how long should a diver remain away after a diving shallower than 10m within acceptable no-stop limits ?

A

Following DMAC022

The Diver should remain 20min away from DDC for at least 1h after surface

47
Q

Regarding to the proximity of DDC, how long should a diver remain away after a diving shallower than 10m within acceptable no-stop limits ?

A

Following DMAC022

The Diver should remain 20min away from DDC for at least 1h after surface

48
Q

After a completion of oxy-helium or other saturation decompression or after surface-orientated dives requiring decompression stops and after dives within the no-stop limits but with multiple ascents (‘yo-yo’ diving) what is the proximity of DDC the diver should stay?

A

The divers should remain in the vicinity (within 20 minutes) of a suitable chamber for 4 hours.
They should then remain within two hours travelling time of a two-compartment chamber until 12 hours post-surfacing.

49
Q

In a mixed gas diving what is the minimum quantities of medical oxygen for therapeutic decompression?

A

In addition to the minimum quantities of medical oxygen (90m3), should be available to carry out 2 full treatments.

50
Q

What’s the period for testing diving chambers and bells?

A 
6 monthly visual
- 2.5 years working pressure leak test (1% max in 24h)
- 5 years overpressure test
View ports
- 6 monthly visual
- 2.5 years leak test
- 5 year overpressure leak
- 10 year renewal
51
Q

It is compulsory to have a surface compression chamber on site on offshore installations for diving at what depth?

a) 10 msw
c) 30 ft
b) 5 msw
d) all offshore diving operations

A

d

52
Q

Diving chambers and bells must have a pressure leak test every:

a. 30 months
b. 6 months
c. 12 months
d. 24 months

A

a

53
Q

All chambers and bells will have a MWP leak test every?

a) 2 years
b) 6 months
c) 2 1/2 years
d) 4 years

A

c

54
Q

For a Surface supply mixed gas diving, whats the minimum internal diameter of the DDC for only one diver requiring decompression ?

what is for more than 1 diver ?

A

minimum internal diameter of 1.37m (54”) if only one diver in the water and only one diver requiring decompression at any one time;

minimum internal diameter of 1.5m (60”) if more than one diver in the water or more than one diver requiring decompression at any one time

55
Q

During the ascent for a surface decompressure the diver took 6 minutes from 40ft in the water to 50ft in the chamber. What action would you take in this case?

A

If the surface interval is more than 5 minutes but less than or equal to 7 minutes,
increase the time on oxygen at 50 fsw from 15 to 30 minutes, i.e., add one-
half oxygen period to the 50 fsw chamber stop. Ascend to 40 fsw during the
subsequent air break. The 15-min penalty is considered a part of the normal
surface decompression procedure, not an emergency procedure.

56
Q

In case of a diver delay 7 min or more to reach the chamber depth of 50ft on O2, what action would you take?

A

If the surface interval is greater than 7 minutes: continue compression to a depth
of 60 fsw. Treat the divers on Treatment Table 5 if the original schedule required
2 or fewer oxygen periods in the chamber. Treat the divers on Treatment Table
6 if the original schedule required 2.5 or more oxygen periods in the chamber.

57
Q

The diver is schedule for a surface decompression of 1 full period. At the chamber compression he advises the chamber operator that he is enable to equilize his ears.
What action should the suervisor in charge take?

A

double the number of chamber oxygen periods indicatedin the table and take these periods at the deepest depth the diver is able toattain.
Oxygen time starts when the diver initially goes on oxygen.

Interrupt oxygen breathing every 60 minutes with a 15-min air break. Theair break does not count toward the total oxygen time.

Surface the diver at 30 fsw/min upon completion of the oxygen breathingperiods and carefully observe the diver for the onset of decompressionsickness.

58
Q

In case of loss of oxygen in the chamber during the normal decompression precedure, what action should you take?

A

For loss of oxygen supply in the chamber, have the diver breathe chamber air. If
the loss is temporary, return the diver to oxygen breathing. Consider any time spent
on air as dead time.

59
Q

State the Correction Factor of pneumo measuring depth.

A

0-100 fsw = +1 fsw
101-200 fsw = +2 fsw
201-300 fsw = +4 fsw
301-400 fsw = +7 fsw

60
Q

A diver medic has been blowdown to assess a diver during a Table 5 treatment. During the decompression does the tender needs also to be on O2 ?

A

Tender breathes 100 percent O2 during ascent from the 30-foot stop to the surface. If the tender had a previous hyperbaric exposure in the previous 18 hours, an additional 20 minutes of oxygen breathing is required prior to ascent.

61
Q

In a portable mobile surface supply system, how far should be the support vessel ?

A

The boat should have a propulsion system that will allow fast and efficient return of the diver to the support vessel and as a general guide, should be no more than 15 minutes away.

62
Q

An diver is is on his wet stop prior Sur D02, a red light occurs, what would be your course of action?

A

You would bring him out and give him a therapeutic treatment.

63
Q

Chambers should be fitted with PRV which?

a) Vent at 2 psi above ambient
b) Prevent medical lock being opened under pressure
c) Prevent overpressurisation of DDC
d) Allow divers to vent DDC

A

c

64
Q

How long should a DDC normally be available after diving?

A

Is should be available for 12h

Both air and heliox saturation diving, diver should stay with 20min of the chamber for the first 4h, than within 2h of the chamber forthe remaining 8h.

65
Q

Normal CO2 levels in a DDC should be kept below what?

a) 0.05 bar
b) 50 mb
c) 5 SEP
d) 0.005 ATA

A

d) 0.005 ATA

66
Q

What is the lowest % of O2 in a chamber that will support complete combustion?

A

16%

Air Diving Supervisors QUESTIONS (12 decks)

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