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Air Diving Supervisors QUESTIONS > Supervisor General Knowledge > Flashcards

Supervisor General Knowledge Flashcards

1
Q
  1. What should an adjustable buoyancy jacket HP cylinder be filled with?
    a) air
    b) carbon dioxide
    c) nitrogen
    d) oxygen
A

a) air

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2
Q
  1. What depth would a seawater depth gauge show for a freshwater dive?
    a) shallower
    b) the same
    c) deeper
    d) it would not work
A

a) shallower

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3
Q
  1. You have a diver working at 134 fsw, your company’s deco table have a maximum of 140 fsw and maximum of 20 min bottom time, your diver is held up for five min therefore his bottom time exceeds your maximum time by minutes, would you….
    a) deco him on the 140 fsw for 20 min table and observe him
    b) deco him in one and a half times the deco time for 140/20 min table
    c) add the delay time onto his first stop
    d) deco him on the 140/20 min table, and then put him on a therapeutic table
A

d) deco him on the 140/20 min table, and then put him on a therapeutic table

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4
Q
  1. During a surface orientated dive, a tender receives 6 pulls on the diver s umbilical what does it mean?
    a) may I come up
    b) I want to come up, assist me
    c) emergency signal
    d) have found, started or complete work
A

c) emergency signal

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5
Q
  1. What’s the most dangerous risk that could occur during the battery charging?
    a) explosive atmosphere
    b) electric shock
    c) acid burns
    d) dropping the battery on your foot
A

a) explosive atmosphere

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6
Q
  1. with scaffolding work over the side, diving ops at 130 fsw should keep how far away from the platform?
    a) 100 feet
    b) 150 feet
    c) 1000 feet
    d) 200 feet
A

d) 200 feet

Remember 1.3 times the working depth

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7
Q
  1. What’s the recommended water jet pressure when cleaning with grit to SA 21/2 standard?
    a) 0 - 210 bar
    b) 210 - 350 bar
    c) 210 - 500 bar ( 4000 - 8000)
    d) 350 - 500 bar
A

c) 210 - 500 bar ( 4000 - 8000)

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8
Q
  1. What voltage is preferred for underwater electrical equipment, without earth leakage protection ( ELCBs)?
    a) 220 v
    b) 110 v
    c) 48 v
    d) 24 v
A

d) 24 v

NOTE: 110v AC max voltage underwater WITH ELCBs

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9
Q
  1. If the body temperature is raised, what will happen to the solubility of the gases into the body?
    a) it will increase
    b) it will decrease
    c) it will stay the same
    d) has no effect
A

b) it will decrease

Henry’s law

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10
Q
  1. How many ways can heat be transferred?
    a) 1
    b) 2
    c) 3
    d) 4
A

c) 3

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11
Q
  1. A diver loses body heat to the surrounding water by?
    a) convection
    b) Radiation
    c) conduction
    d) thermal balance
A

c) conduction

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12
Q
  1. Heat lost by ( creating) water current ( heating the surrounding fluid) is transferred by?
    a) convection
    b) Radiation
    c) conduction
    d) thermal balance
A

a) convection

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13
Q
  1. Active heating must be supplied to divers breathing ?
    a) 50/50 nitrox
    b) air
    c) 30/70 nitrox
    d) heliox
A

d) heliox

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14
Q
  1. How many times AC is more dangerous than DC?
A

5 more times.

Use DC in preference to AC

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15
Q
  1. What’s the minimum retro lance length for water jet?
A

60cm

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16
Q
  1. A mushroom valve in a helmet oral nasal mask is to?
    a) allow CO2 build up into the hat
    b) allow air from free flow valve into oral nasal to remove CO2 build up or clear water
    c) equalise pressure between the valve & hat
    d) prevent the hat from flooding
A

b) allow air from free flow valve into oral nasal to remove CO2 build up or clear water

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17
Q
  1. During surface supply dive using a wet bell, you have two divers and bellman in the water.
    You loose comms to both divers, would you…
    a) pull up the wet bell 2m to attract the divers attention
    b) switch off the air supply for a few moments to attract the divers
    c) free flow the pneumos
    d) call the bellman
A

d) call the bellman

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18
Q
  1. How would you confirm the NRV of KMB mask or helmet is working?
    a) open bailout bottle and em. Valve on hat before connecting the umbilical
    b) open em. Valve and blow down umbilical connection
    c) open bailout and em valve before connecting bailout hose
    d) open free flow & blow down umbilical connection
A

a) open bailout bottle and em. Valve on hat before connecting the umbilical

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19
Q
  1. An ROV should only be deployed and recovered during diving ops with the authority of whom?
    a) the diving supervisor
    b) the OIM or master
    c) the Rov senior operator
    d) the client rep
A

a) the diving supervisor

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20
Q

The minimum amount of compressed air required for surface oriented diving
is?
a. Sufficient air to complete the dive with a reserve for decompression if
required
b. Sufficient air to complete the dive to work depth only
c. Sufficient air for two emergency dives to the full intended depth as a
reserve
d. Sufficient gas to supply two divers at the intended working depth plus
reserve

A

c

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21
Q

The minimum amount of compressed air required for surface oriented diving
with a D.D.C. is?
a. Sufficient air to pressurise the main lock to maximum possible work
depth plus sufficient air for three surface decompression cycles
b. Sufficient air to pressurise both D.D.C. locks to maximum treatment
depth
c. Sufficient compressed air to complete 3 surface decompression cycles
and an emergency treatment
d. Sufficient compressed air to pressurise both D.D.C. locks to
maximum possible treatment depth plus sufficient air for 3 complete
surface decompressions

A

d

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22
Q 
The maximum allowable CO in an air supply is?
a 1 PPM
b 3 PPM 
c 40 PPM
d 500 PPM
A

b

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23
Q

During surface supplied diving using a wet bell, you have 2 divers in the water
you lose communications to both divers. Would you?
a. Pull up the wet bell 2 metres to attract the divers attention
b. Switch off the gas supply for a few seconds to attract the divers
c. Free flow the pneumos
d. Send down the standby diver

A

d

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24
Q

With a chamber in use, the medical lock should be?

a. Kept at depth with both doors closed
b. Kept at surface with exterior door open
c. Kept at depth with interior door open
d. Kept on surface with both doors closed

A

d

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25
Q

During a surface supply dive, the diver informs you that he has lost his air
supply and gone on bail-out. Would you?
a. Instruct the diver to complete this work as soon as possible
b. Instruct the diver to secure the job and tools, then return to wet bell
c. Instruct the diver to return to the wet bell and wait
d. Instruct the diver to return to the wet bell immediately, and inform
you when he is in it and ready to come up

A

d

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26
Q

What is the function of the enclosed canopy on a wet bell?
a. To allow the tender to remove his helmet
b. To give clearer communications with the surface
c. To provide divers with an air pocket in case of loss of air supply
d. To allow divers to communicate with one another without their
helmets

A

c

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27
Q

When a diver using surface O2 decompression is on his last stop, he can?

a. Disconnect his spider
b. Remove his fins to allow easier exit from the wet bell
c. Remain fully dressed
d. Remove as much equipment as safely as possible

A

c

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28
Q

The mushroom valve in the oral nasal of a Kirby Morgan is ncessary for?

a. Assisting in de-misting the face plate
b. Creating a back pressure which will allow the second stage to work
c. Keeping the oral nasal mask free from over-pressure
d. Allowing the diver air via the air flow

A

d

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29
Q 
An air sample must be taken from a compressor and analysed for contaminates
every?
a. month
b. 3 months
c. 6 months 
d. 12 months
A

c

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30
Q

In an air dive through the moonpool of a D.P. dive support vessel, diving
should only take place if the dive depth exceeds the operating draught of the
vessel?
a. Plus 5 metres
b. Plus 10 metres
c. Plus 15 metres
d. Plus 20 metres

A

b

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31
Q

Your umbilical length requires to be a minimum distance from a hazard
(thrusters, intakes). What is this length?
a 1 metre
b 3 metres
c 5 metres
d It does not require to be any specific distance away

A

c

5m Diver
3m Stby Diver

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32
Q

You must situate air intakes for compressors?
a Anywhere as they have filters in them
b Anywhere as long as you analyse for any contaminants
c Well clear of areas of dangerous gases and exhaust fumes
d As high as possible

A

c

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33
Q

In water breathing patterns should be?
a Listened to check they aren’t being lazy
b Ignored
c Monitored by the supervisor to check the diver’s condition
d Checked every 10 minutes

A

c

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34
Q

The superintendent may perform the role of dive supervisor if?
a He does not agree with the dive supervisor
b In the ICOP he is not allowed to
c He is qualified as a supervisor and the dive logbook is signed over
d The supervisor needs a short toilet break

A

c

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35
Q 
Which of the following personnel may not do any other function during a
dive?
a A superintendent
b A supervisor
c A diver waiting to dive
d A standby diver
A

d

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36
Q 
Oxygen storage areas should be protected by?
a Being indoors
b Being undercover
c A fire deluge system 
d An electric fence
A

c

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37
Q 
According to the ICOP, diving baskets used by surface orientated divers
should have?
a Tools only
b Fresh paint with no rust
c An emergency winch
d Emergency breathing gas cylinders
A

d

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38
Q 
Does an air dive control require an O2 analyser on line fitted to the diver’s air
supply?
a No, as it’s being air supplied
b Yes, but no alarm is required
c Only in reclaim systems
d Yes, with a high and low alarm
A

d

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39
Q 
A CO2 analyser works on the principal of gas obsorbtion using?
a Polarography
b Heat
c Paramagnatism
d Infra-Red
A

d

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40
Q

Which of the following statements are true?
a During H.P. water jetting, a diver can block off the operating trigger
the gun in order to maintain the valve in the open position
b Always use water jet guns in which the trigger incorporates a fail
safe device to cut off the water automatically when the trigger is
released
c Water jetting noise levels can interefere with D.P. operations
d More than one diver can operate in the area where water jetting taking
place providing the operator of the jetting gun has visibility twice that
of the total length of his umbilical

A

B C

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41
Q 
Nitrogen narcosis usually starts in depths exceeding?
a 18 msw
b 30 msw 
c 40 msw
d 50 msw
A

b

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42
Q

For dives over 10 msw and up to 50 msw with either no planned in-water
decompression or with planned in-water decompression of up to twenty
minutes. The availability of a suitable 2 person, double lock DDC should be
no more than ?
a 2 hours travelling from the dive site
b Located at the dive site
c 6 hours travelling from the dive site
d A DDC is not required

A

b

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43
Q

On D.P. the divers maximum length of umbilical will not be greater than?
a The distance between surface and the wet bell and basket
b The distance between the nearest thruster and the point of tending less 5 metres
c The draft of the vessel
d The distance from the basket and worksite from the nearest thruster less 3 metres

A

b

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44
Q

Who as a minimum in a dive team should be qualified diver medic?
a Dive supervisor
b Life support supervisor
c Ships medic
d 1 dive team member, other than the diver in the water

A

d

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45
Q 
Acute O2 toxicity can occur in the water if the PPO2 exceeds?
a 2.8 bar
b 3.2 bar
c 2.5 bar
d 1.6 bar
A

d

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46
Q 
What percentage of gas must be handled and stored as pure oxygen?
a Above 20%
b Above 25% 
c Above 40%
d Above 50%
A

b

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47
Q 
The electrode used in oxy-arc cutting underwater must be?
a Neutral
b Positive
c Negative 
d Interchangeable
A

c

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48
Q 
A diving basket needs to carry at least?
a 1 diver
b 2 divers 
c 3 divers
d 4 divers
A

b

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49
Q 
There is only one person who can appoint a supervisor for a diving operation,
that person is?
a Superintendent
b Master of the vessel
c Client
d Diving Contractor
A

d

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50
Q 
What is the minimum amount of personnel required to conduct a safe surface supplied dive?
a 3
b 6
c 5 
d 8
A

c

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51
Q 
The location of first aid equipment can be identified by?
a Red cross on a white background
b Red cross on a green background
c Green cross on a white background
d White cross on a green background
A

d

52
Q

A standby diver’s duties are?
a Remain dressed in, wearing his hat/helmet
b To help dive team with umbilicals and equipment
c To make supervisors tea or coffee
d To remain at dive station, dressed in, dive hat/helmet ready and
checked to put on in an emergency

A

d

53
Q

In diving operations using R.O.V.’s, who or what should leave the worksite
first?
a The ROV goes to the bell area first and the diver follows
b The Diver
c The ROV
d The ROV and diver together

A

b

54
Q 
IMCA state that maximum recommended PPO2 in nitrox diving is?
a 1.4 bar 
b 1.6 bar
c 2.8 bar
d 3.2 bar
A

a

55
Q 
What length should a standby divers umbilical be compared to a diver’s umbilical?
a 2 metres longer 
b 5 metres longer
c 6 metres longer
d 1 meter longer
A

a

56
Q 
To ensure safety in underwater oxy-arc cutting, there should be?
a O2 alarm
b Twin pole knife switch 
c An earth leakage circuit breaker
d High voltage alarm
A

b

57
Q 
Who is responsible for conducting risk assessments?
a Dive supervisor
b Dive contractor 
c Superintendent
d Client
A

b

58
Q 
In an air chamber the % O2 should never be allowed to rise above?
a 25%
b 30%
c 21%
d 23%
A

d

59
Q

A smoulder fire occurs in a D.D.C. What should you instruct the diver to do?
a Extinguish the fire
b Divers on BIBS and try to extinguish the fire
c Activate the deluge system
d Attempt to extinguish fire then put on BIBS

A

b

60
Q 
A radiation source is measured in?
a Curies 
b Rems
c Rads
d Currents
A

a

61
Q 
What is the cylinder colour coding for diving quality oxygen?
a All black
b Grey with black top
c Black with white top 
d Grey with white top
A

c

62
Q

A diving supervisor is responsible to the contractor for ensuring that?
a All equipment is tested
b He countersigns the divers log books
c If he dives, another supervisor appointed by the contractor takes over
d All of the above

A

d

63
Q

The safe stand off distance during underwater radiography exposure is:

a. 8 metres
b. 10 metres
c. 18 metres
d. 20 metres

A

a

64
Q

Prior to the start of a second bell run, the checks should be carried out by:

a. Divers from previous bell run once the bell is on the system.
b. Divers for the next bell run prior to the bell being isolated from system.
c. Divers for the next bell run while bell is on the way down.
d. Divers from the previous bell run as the bell is on its way up.

A

b

65
Q

When putting gas on line from a quad do you:
a. Open the King valve then one bottle to pressurise the line
b. Open all the bottles then the King valve
c. Open the King valve fully then close it ½ turn then open all the valves
d. Open all the valves fully then close then a ½ turn and open the King valve
fully then close it a ½ turn

A

d

66
Q

Draeger tubes work on which principle:

a. Paramagnetism
b. Polarograph
c. Colorimetry
d. Infra red Adsorbtion

A

c

67
Q 
During a lock out the divers gas supply analyser alarm sounds in dive control. What
action would you take?
a. Check bank pressure
b. Switch to back up mix 
c. Inform bell man
d. Inform diver
A

b

68
Q

An ROV is working alongside a diver. Which leaves the job site first?

a. It is irrelevant if there is no obvious dangers to the diver
b. The diver
c. The same time
d. The ROV

A

b

69
Q

During a bell run you lose your main lift wire, umbilical and guide wire. What is the
first action you would take?
a. Mark the location
b. Try to contact the bell using through water comms.
c. Contact the superintendent and wait for a response
d. Contact the bridge and wait for a response

A

a

70
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

71
Q

The Bellman’s first action in response to an unconscious diver in the water should be:

a. Pull diver back to bell
b. Lockout and recover diver
c. Change to onboard gas supply
d. Close divers gas supply

A

c

72
Q

A DP Vessel with a draft of 5 msw and a distance of 20 msw between the
nearest thruster and the bell deployment point, positions the diver’s work
platform at a depth of 40 msw. What is the maximum length permitted for the
diver’s umbilical?
a 33 msw
b 35 msw
c 40 msw
d 45 msw

A

b

73
Q 
Offshore, electric hand tools used in workshops should be:
a 12 v
b 24 v
c 110 v 
d 240 v
A

c

74
Q 
The commonest cause of fire is:
a Bad housekeeping 
b Storage of inflammable materials
c Poor fire fighting equipment
d Poor ventilation
A

a

75
Q 
To ensure safety in underwater OXY-ARC cutting there should be:
a An earth leakage circuit breaker
b O2 alarm
c High voltage alarm
d Twin pole knife switch
A

d

76
Q

When a diver using surface O2 decompression is on his last water stop, he can:
a Disconnect the spider
b Remove his fins to allow easier exit from the wet bell
c Only remain fully dressed
d Remove as much equipment as safely as possible

A

c

77
Q 
The electrode used in OXY-ARC cutting underwater should be:
a Neutral
b Positive
c Negative 
d Interchangeable
A

c

78
Q 
Which is the most likely to cause an explosion underwater?
a Cutting a pipeline
b OXY-ARC cutting in a confined space 
c NDT of a bracing
d Photography in a habitat
A

b

79
Q 
With a grit attachment the normal accepted HP setting for a water jet is:
a 1,000 - 4,000 psi
b 4,000 - 8,000 psi 
c 8,000 - 12,000 psi
d 12,000 - 15,000 psi
A

b

80
Q

Once the diver is in the water and working the tender is:
a Responsible for the compressor
b Responsible for the diver’s safety
c Responsible for the care of the diver’s umbilical
d Responsible for the preparation of the DDC

A

c

81
Q

The mushroom valve in the oral nasal of a Kirby Morgan is necessary for:
a Assisting in de-misting the face plate
b Creating a back pressure which will allow the second stage to work
c Keeping the oral nasal free from over pressure
d Allowing the diver air via the free flow

A

d

82
Q

In an O2 analyser, a micro-fuel cell works by:

a Paramagnetism
b Polarography
c Infra-red
d Heat

A

a

83
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 DDC
A

c

84
Q

During a familiarization program who could carry out the training?

a) a supervisor
b) safety officer
c) any experienced person
d) those named in the diving project plan

A

d) those named in the diving project plan

85
Q

In diving ops, the divers gas/air must be monitored in dive control by?
A) an O2 analyzer fitted with HI/LO audio/visual alarms
B) an O2 analyzer for gas dives only
C) an O2 analyzer air dives only
D) an O2 analyzer and Co2 analyzer

A

A) an O2 analyzer fitted with HI/LO audio/visual alarms

86
Q

When oxy/arc cutting underwater, what would you require the diver to do?

a) check rod hole clear
b) flow O2 before asking to make it hot
c) check earth clamp tight
d) all of the above

A

d) all of the above

87
Q

Breathing gas heating must be provided when….

a) air diving
b) deeper than 150m
c) nitrox
d) not diving

A

b) deeper than 150m

88
Q 
The maximum depth for standby surface orientated diver is?
A) 30msw
B) 50msw 
C) 75msw
D) 80msw
A

B) 50msw

89
Q

A diving supervisor can refuse to supervise a diving ops if?

a) the ops is too large for a supervisor to safely control
b) the ops is too complex
c) the supervisor is not competent to supervise the ops
d) all of the above

A

d

90
Q

What gas would be contained in a cylinder painted all pink?

a) calibration gas
b) carbon dioxide
c) argon
d) hydrogen

A

a

91
Q

Which of the following need to be considered in diving ops assessments?

a) site specific hazards
b) risk to members of the public
c) regular interval RA reviews
d) all of the above

A

d

92
Q

The diving contractor must ensure?

a) suitable and sufficient plant available
b) provision of first aid
c) dive equipment meets recognized standards
d) all of the above

A

d

93
Q

What must a diving supervisor have in the way of documentation on a job?

a) a log book
b) a first aid certificate
c) a diver medic certificate
d) a letter of appointment

A

d

94
Q

What’s the maximum voltage a diver could be exposed to underwater with and without E.L.Ts or R.C.Ds?

a) 40v and 220v
b) 24v and 440v
c) 110v and 24v
d) 110v and 48v

A

c

95
Q

After going underwater an abrasive cutting disc should be ?

a) washed in fresh water, dried and stored flat
b) kept underwater for future use
c) only used again at half normal operating speed
d) discarded

A

d

96
Q

What the language should be used in a diving project?

a) English
b) the language of the majority of the divers
c) the language stated in the project plan
d) the language of the ships registration

A

c

97
Q

Which of the following notice should be displayed on a diving operation?

a) the diving contractor liability insurance
b) the name and the contact details of the HSE inspector
c) the name and contact details of the medical advisor
d) all of the above

A

d

98
Q

When nitrox diving is carried out, the partial pressure of the o2 should not exceed what pressure bar absolute ?

a) 1.4
b) 1.5
c) 1.6
d) 2.0

A

a

99
Q

When breathing nitrox mixture what’s the equivalent air depth?

a) the same as the actual depth
b) the percentage of nitrogen applied to the water depth
c) the depth in air that would give the same PPN2 as that given by the nitrox
d) the depth in air that would give the same PPO2 as that given by the nitrox

A

c

100
Q

If a ladder is used for the diver to entry and exit the water, how far should it go?

A

Diving ladder should be minimum of 2m underwater, and the diver should not have to climb more than 2m above the water surface.

101
Q

List the equipments must be available in case of diving baskets are used ?

A
  • should be provide dedicate diving basket for standby diver.
  • emergency cylinders with a first stage and double conection with a demand valve and rigid hose where the diver could pushed up inside of the neck seal.
  • content gauge
  • half mask.
102
Q

When diving from a small craft/portable supply system, how far should the support vessel be?

A

Should not be more than 15min away.

Also should have a self propulsion system.

103
Q

In a surface supply air dive, if a ladder is used for entry and recovery system, what is important to know abou it?

A

The ladder should be 2m below the water level and the diver should not have to climb more than 2m above the water surface

104
Q

Regards to 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

105
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.

106
Q

In a portable mobile system, how long the battery backup should last in case of main power loss?

A

System should be fitted with batteries to last at least 30 minutes.

107
Q

In case of Nitrox diving , the divers bailout should be filled with bottom mix or breathing air quality?

A

There are no requirements for that. The debate inthe industry about it is…

  1. if is Nitrox and the diver breath the content, his decompression will not be altered. If is air his decompression schedule could be incorrect.
  2. If is Air, in case of oxygen toxicity, he could switch instantly from nitrox to air. Breathing a lower percentage of O2.
108
Q

What are the limitatios of Mixed Gas Diving?

A
  1. Should have main supply umbilical from the surface providing air to a manifold inside of the wet bell.
  2. Divers excursion umbilical terminated at the wet bell
  3. maximum depth of 75m
  4. Depths between 0m and 50m, bottom time and in water decompression required less than 100 minutes
  5. Depths between 50m and 75m, bottom time should be limited to 30 minutes
  6. As a minimum should should be 7m3 of bottom mix and compressed air for each diver at the maximum planned depth.
109
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.

110
Q

In accordance with IMCA D012,Stainless steel pipe or fittings should not be used to handling gas mixture with 25% oxygen or more.

True or False

A

True

111
Q

How many times more dangerous is alternating current than direct current?

a) 5 times
b) 10 times
c) 20 times
d) 300 times

A

a) 5 times

112
Q

Where should the divers pneumo hose be located?

a) accessible behind divers back
b) behind hat emergency valve
c) accessible at chest level
d) cut off at umbilical carabiner

A

c) accessible at chest level

113
Q

During a surface supplied dive, the tender informs you he has paid out 160 ft of umbilical according to the markings. The pneumo gauge shows the depth as 120 fsw , would you ?

a) accept the tender reading and ignore the pneumo
b) add 10 ft to umbilical distance snd decompress to this
c) ignore both the tender and pneumo and decompress for planned depth
d) open pneumo - ask diver if he has bubbles. Close and re-read pneumo

A

d) open pneumo - ask diver if he has bubbles. Close and re-read pneumo

114
Q

DMAC 012 recommends diving ops should not be carried out within certain distances of the seismic surveying. What’s the minimum recommended without contact with survey vessel?

a) 5km
b) 1200 m
c) 10 km
d) 2000m

A

c) 10 km

115
Q

Who should be responsible for safeguarding any pipeline inlets under lower pressure than the surrounding water.

a) supt
b) master of the vessel
c) divers
d) pipeline owner

A

d) pipeline owner

116
Q

If the diver became unconscious underwater, would you?

a) jump the standby
b) pull diver up quickly
c) pull the diver up slowly
d) put air on the divers pneumo

A

a) jump the standby

117
Q

Which of the following statements are true:

a) During HP water Jetting, a diver can block off the operating trigger of the gun in order to maintain the valve in the open position if he has
permission to do so from the supervisor.
b) More than one diver can operate in the area where water jetting is
taking place, providing the operator of the jetting gun has visibility
twice that of the total length of his umbilical.
c) Always use jet guns in which the trigger incorporates a fail-safe
device to cut off the water automatically when the trigger is
released.
d) When water jetting, noise levels can interfere with DP operations.

A

C and D

118
Q

List three safety precautions to be observed when using welding or cutting equipment underwater.

A
  1. Experienced Personnel
  2. EQ never taken back to bell / do not work under bell – toxic or explosive gases
  3. EQ should always be ‘DEAD’ when being worked on
  4. DC supply – negative source used for electrode / positive earth
  5. 2 Pole Knife Switch or Circuit Breaker – Failsafe and with indication of position
119
Q

What is the relation between scaffolding activities and diving operations?

A

A minimum horizontal distance should be applied of 1.3 times the depth at which the diver is working,

120
Q

DMAC 012 recommends diving operation should not be carried out within a certain distance of seismic surveying, what is the minimum distance?

A

The parties should perform a communication exercise or test at the start of simultaneous operations to determine the acceptable safe distance for the local conditions. Starting at a distance of 10 kilometres, the seismic source array will be gradually ramped up, and the seismic vessel gradually moved closer to the diving operation, with constant communication between the diving supervisor and the seismic party manager.

121
Q

During a surface supplied the tender informs you he has paid out 160 ft of umbilical according to the markings, the pneumo gauge shows the depth as 120 fsw, what your be your course of action?

A

You would open the pneumo and ask the diver if he has bubbles, close and re-read the pneumo

122
Q

Name the 2 most commonly used high pressure pipe fittings used on air and saturation systems?

A

JIC - Joint Industrial Council

NPT - National Pipe Thread

123
Q

To ensure a better cutting efficiency on oxy arc procedure. What should be the minimum
purity percentage of oxygen?

a. 50%
b. 75%
c. 99.5%
d. 100%

A

C. 99.5%

124
Q

In D003 the power supply of all oxy-arc operations require a direct current (dc) generator capable of supplying at least …………… at the electrode.

a. 150 amps
b. 200 amps
d. 300 amps
c. 400 amps

A

a. 150 amps

125
Q

In a oxy arc cutting, the Control of the oxygen supply delivery pressure is via an oxygen rated, high flow regulator needs to be set at ……

A
  1. 21 bar or 90 psi above the water pressure.

note: delivery minimum of 1.98m3/min

126
Q

Manufactures attachments points on liffiting bags should have a MBL/MBF of?

a. 1.5 times the WLL
b. 2 times the WLL
c. 2.5 times the WLL
d. 5 times the WLL

A

a. 1.5 times the WLL

Air Diving Supervisors QUESTIONS (12 decks)

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