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Bell Diving Supervisors QUESTIONS > Vessel's General Knowledge > Flashcards

Vessel's General Knowledge Flashcards

1
Q

Name 3 locations diving operations can be carried out from?

A

Fixed platforms and temporary fixed platforms.
Small craft - daughter craft vessels
Specialist locations - barges
Large barges and multihulls DSV’s

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2
Q

What classification of vessels are required for DP diving ops?

A

Class 2 and 3

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3
Q

What’s the purpose of a DP system?

A

To maintain position keeping of the vessel.

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4
Q

What’s the 5 systems required in a DP system?

A 
Power system
Propulsion system
Sensor system
Control system 
Reference system
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5
Q

What’s the maximum power percentage output allowed for brief periods of the thrusters?

A

80%

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6
Q

What’s the 3 colors displayed in a dive control in a DP alert status box and what does it means?

A

Constant GREEN LIGHT - normal operation status

Flashing YELLOW LIGHT - degraded operation status

Constant RED LIGHT with audible alarm - DP emergency status

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7
Q

What’s the minimum personal required in a DP control room during dive operations?

A

2 - one been fully competent for all aspects of DP control without supervision.

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8
Q

What’s the minimum DP duration before commencing dive operation?

A

30 minutes

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9
Q

What lights are displayed at night to indicate a vessel on DP carrying out diving operations?

A

RED - WHITE - RED

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10
Q

What Symbols are displayed in the day light to indicate a vessel on DP carrying out dive operation?

A

BALL - DIAMOND - BALL

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11
Q

What’s the minimum separation between diving basket or bell and the subsea asset?

A

5 meters

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12
Q

Vessels movements should be orientated around what, during diving ops?

A

The work station, always notify dive supervisors, divers and ROV.

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13
Q

The shallow the water the greater the scope of movement.

True or false?

A

False

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14
Q

What’s the minimum distance should be maintain between anchor chains and the bell or diving baskets?

A

50 meters or indicated in the company manual.

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15
Q

What’s the recommended distance for moving the vessel when changing locations with diver in the water?

A

5 meters increments

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16
Q

A DP system can be disturbed subsea when carrying out dive ops, by what?

A

Bell flushing
Divers free flow
Large volume of compressed air - dumping
HP water jet

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17
Q

Name 2 propulsion systems?

A

Azimuth thrusters
Tunnel thrusters
Main engines propellers and rudder.

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18
Q

Name 3 types of position reference systems. PRS?

A 
Tault wire
Hydro-acoustic Position Reference. HPR
Differential Global Positioning System. DGPS
Laser Radar System. 
FM radar system.
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19
Q

What’s the recommended distance to maintain separation between a ships beacon to and subsea asset?

A

10 meters

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20
Q

What’s the maximum angle of deflection when using a tault wire before having to reset reference ?

A

15 degrees

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21
Q

How many DP reference systems are required for diving operation to commence?

A

3 systems.

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22
Q

What are the 6 main vessels movements and specify them?

A

HEAVE - up and down of the vessel
SWAY - moving straight to port and starboard of the vessel
SURGE - forward and stern of the vessel
ROLL - rolling to port and starboard
PITCH - rolling bow and stern
YAW - circular movement keeping the centre of the vessel

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23
Q

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

A) 5km
B) 10km
C) 1200m
D) Where diving and seismic activity will occur within a distance of 30km (18.6 miles) a joint risk assessment should be conducted, between the clients/operators involved and the seismic and diving contractors in advance of any simultaneous operations.

A

D

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24
Q

What zone is safe to use Artemis units?

A

Zone 1

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25
Q

What sign is circular on blue background with symbols in white?

A) prohibition sign
B) warning sign
C) safe condition sign
D) mandatory sign

A

D) mandatory sign

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26
Q

What sign is circular with red border and a crossbar over a black symbol on a white background ?

A) warning sign
B) prohibition sign
C) mandatory sign
D) safe condition sign

A

B) prohibition sign

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27
Q

On a DP vessel, communications when diving must be provided between?

A) dive control and masters cabin
B) dive control and engine room
C) dive control and LST cabin
D) dive control and ships crane if being used for diving ops

A

D) dive control and ships crane if being used for diving ops

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28
Q

In conditions of reduced visibility, decisions about the suitability for diving from DP vessels should be rest with?

a) the LST supervisor
b) the diving superintendent
c) the diving supervisor & captain / OIM
d) the radio operator

A

c) the diving supervisor and captain / OIM

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29
Q

What’s the single most important criterion for the diver exposed to LOW frequency sonar?

a) vibratory sensation in the hands, arms and legs
b) DCI
c) Unable to hear supervisor over the comms
d) disorientation due to vestibular stimulation.

A

d) disorientation due to vestibular stimulation.

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30
Q

Your DPO informs you there is a fishing boat approaching the DSV and he is unable to contact them by radio. What action would you take?

a) continue normal diving ops
b) abort the dive and recover the bell
c) warn the divers to standby to move to agreed safe place
d) tell the DPO to move the vessel

A

c) warn the divers to standby to move to agreed safe place

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31
Q

When diving on DP in shallow water, which of the following is least affected?

a) vertical tault wire
b) radio or surface position reference
c) acoustic system HPR
d) vessel capability

A

b) radio or surface position reference

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32
Q

An acoustic beacon for the DP PRS should not be located within what distance of the subsea structure?

a) 5m
b) 10m
c) 30m
d) 100m

A

b) 10m

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33
Q

What sign is a triangle with a black border and a symbol on a yellow background?

A) prohibition sign
B) warning sign
C) safe condition sign
D) mandatory sign

A

b) warning sign

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34
Q

Under U.K. regs, what’s the minimum number of the independent position references system “ in use” during DP diving ops?

a) 1
b) 2
c) 3
d) 4

A

c) 3

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35
Q

In addition to the diving supervisor, whom should the DP operator inform of an “Alert status”?

a) LST
b) master and diving supt
c) master and client rep
d) diving supt and client rep

A

b) master and diving supt

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36
Q

If diving alongside a platform at 100msw, where over the side tubular work is in progress, how far should the dive station be away from the platform?

a) 100m
b) 30m
c) 130m
d) 1000m

A

c) 130m

1. 3m times depth

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37
Q

All divers in the water should have a communication system that?

a) allows direct comms with supv
b) uses unscrambler for helium mixtures
c) is recorded & kept for 24h
d) all of the above

A

d) all of the above

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38
Q

Who has the responsibility to direct a diving ops safely?

a) the superintendent
b) the client
c) the supervisor
d) the master or OIM

A

c) the supervisor

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39
Q

Who has the responsibility to ensure that the diving regs are complied with?

a) the client
b) the operator
c) the principle contractor
d) the master or OIM
e) the supervisor or project manager
f) all of the above

A

f) all of the above

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40
Q

SI 2776/1997 covers?

a) commercial diving offshore only
b) commercial diving inland/inshore only
c) both of the above
d) diving into that pub in Peter head

A

c) both of the above

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41
Q

Who has a duty to disclose information, and to ensure there actions do not endanger the divers safety?

a) clients or their representatives
b) master or OIMs
c) crane drivers, maintenance personnel
d) everyone involved in the diving project directly or indirectly.

A

d) everyone involved in the diving project directly or indirectly.

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42
Q

The client, OIM, master and any other person having responsibility for a diving location, must have in writing ?

a) the name of the diving contractor
b) tests and certificates for diving equipment
c) the names of the divers
d) the times and locations of the tea breaks

A

a) the name of the diving contractor

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43
Q

A risk assessment shall be Carried out…

a) only on risk to members of the dive team
b) within 24h of them being identified
c) before the diving project starts
d) only on risks to the public arising from the diving project

A

c) before the diving project starts

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44
Q

Risk assessment are required under?

a) the diving regulations SI 1997 2776
b) the management of health and safety at work regs 2004
c) the national association of the housewife’s and mother’s
d) both a and b

A

d) both a and b

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45
Q

The diving project plan would include…

a) the outcome of the risk assessment
b) contractor operating rules
c) diving techniques and procedures
d) contingency plan to manage recognize risks
e) all of the above plus more

A

e) all of the above plus more

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46
Q

Comms between a seismic vessel surveying and DSV should be continuous where the operating distance is LESS than?

a) 5km
b) 10km
c) 1km
d) Where diving and seismic activity will occur within a distance of 30km (18.6 miles) a joint risk assessment should be conducted, between the clients/operators involved and the seismic and diving contractors in advance of any simultaneous operations

A

d) Where diving and seismic activity will occur within a distance of 30km (18.6 miles) a joint risk assessment should be conducted, between the clients/operators involved and the seismic and diving contractors in advance of any simultaneous operations

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47
Q

State and explain the reference systems for DP vessels.

A
  • tault wire: lateral movement detected by sensor head on boom. Depressor weight on seabed. The deeper the water the greater the operating radius of the vessel.
  • Artemis: the mobile antenna is on the vessel & the fixed antenna is on the jacket, shore, fixed location
  • acoustic: transducer under the ship and a transponder on seabed.
  • satellites DGPS
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48
Q

State the limitations of these reference systems?

Tault wire, Artemis and HPRS.

A
  • Tault wire: if the wire is not kept in straight line, shallow water or fouled in/on structure. Max usual deflection 15°. All equipment should be clear of wires, min of 5m above & 10m to side of any subsea structure.
  • Artemis: blockage of the signal
  • Acoustic: deeper the water, longer takes to react. Maybe out of range. Water jet aeration affects.
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49
Q

What you need to know about vessel movements with the diver in water?

A

a) max movement any direction - 10m (often done 5m steps)
b) max 5° heading change
c) cannot change both distances & heading at the same time.
d) thrusters must not exceed 80% of power capability for more than “brief and isolated periods”
e) most common cause of DP incidents is operator error
f) visibility under 0.5nm is NOT recommended for surface orientated diving.

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50
Q

What’s the most common cause leading to fire?

A

Bad housekeeping.

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51
Q

During diving ops, how many reference systems must be online?

A
  • at least 3 different position system should be online
  • 2 of them should be different type

note: should have 2 anemometers, 2 vertical reference sensors and 3 gyro compass
* Anemometers not considered reference system.

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52
Q

Which DP system is most likely to be affected by the pitch and roll of a DP vessel?

a. DGPS
b. Taut wire
c. Acoustic transponder
d. Artemis

A

b

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53
Q

During DP diving operations a diver umbilical must be physically restrained at the tending point to prevent him from coming within:

a. 3 metres of the thrusters
b. 5 metres of the thrusters
c. 7 metres of the thrusters
d. 10 metres of the thrusters

A

b

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54
Q

During DP vessel movements, on-line position references shall be:

a. one in number
b. two in number
c. three in number
d. four in number

A

c

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55
Q

A DP Vessel can be defined as in NORMAL OPERATIONAL STATUS when which of the following apply?

a The vessel is under DP control and the DP system is operating normally with all the appropriate back up systems available

b Vessels indicated position and heading is within pre-determined limits for all but brief and isolated periods

c When no risk of collision exists

d All of the above

A

d

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56
Q

A flashing red light in dive control on a DP Vessel is accompanied by:

a A PA announcement from the bridge
b A distinctive audio alarm
c An alternative green and yellow light
d A warning sign on the display

A

b

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57
Q

When a DP Vessel is operating a vertical taut wire reference system:

a The operating radius is increased in shallower water

b The deeper the water the greater the operating radius

c The operating radius remains the same regardless of depth

A

b

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58
Q

Horizontal operation clearance between a suspended mooring line and a deployed bell should normally be a minimum of:

a. 20 metres
b. 50 metres
c. 60 metres
d. 100 metres

A

b

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59
Q

The Mobile antenna of the artemis system is:

a The antenna on the platform or structure
b The antenna on the vessel
c Neither of the above
d A combination of one or both of the above

A

b

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60
Q

During diving operation from a DP Vessel the minimum normal acceptable reference systems deployed, connected to the DP computer(s) and in use is:

a One with one on standby
b At least two, with one on standby
c Three
d One, one on standby and one switched off

A

c

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61
Q

The DP operator must apply which status if the available power units are reduced to the level that failure of one more could prevent the vessel holding position:

a Yellow
b Green
c Red
d None

A

a

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62
Q

Of the following, which is incorrect:

a Artemis, 2 acoustic transponders, taut wire
b 2 taut wires, 1 acoustic transponder
c 2 taut wires, 3 acoustic transponders
d 3 acoustic transponders, artemis

A

d

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63
Q

In an air dive through the moonpool of a DP diving 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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64
Q

The DP operator will apply the red alert under which of the following conditions:

a Failure or loss of one DP computer

b Reduction of independent position sensors to one

c System failure results in an inability to maintain positioning or heading control

d The vessels indicated position strays beyond the set limits for more than brief and isolated periods.

A

c

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65
Q

What alert level must be activated by the DP operator if there is a possible risk of collision:

a Yellow
b Red
c Green
d None

A

a

66
Q

On DP the divers maximum length of umbilicals will not be greater than:

a The distance between, surface and the wet bell or 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 basket and work site

A

b

67
Q

Horizontal clearance between a suspended mooring line, and a deployed basket or bell should normally be a minimum of

a 20 metres
b 50 metres
c 60 metres
d 100 metres

A

b

68
Q

Why should care be taken in the use of water jets from a DP vessel?

a Diver is exposed to excessive noise
b Operating noise may interfere with the acoustic transponder
c Disruption of communications
d Interference of navigation system by pump

A

b

69
Q

What constitutes a Zone I area?

a An explosive gas and air mix could occur in a normal operation

b Breathing sets being worn

c An explosive gas and air mix is always present

d An explosive gas and air mix is unlikely to occur and when it does, it will pass rapidly

A

a

70
Q

Using the Beaufort wind scale a gale is:

a 23-28 knots
b 28-34 knots
c 34-40 knots
d 40-45 knots

A

c

71
Q

An imminent gale warning is:

a 0-6 hours
b 6-12 hours
c 12-24 hours
d 24-36 hours

A

a

72
Q

While on DP the maximum heading change allowed is:

a 5 degrees
b 10 degrees
c 15 degrees
d 20 degrees

A

c

73
Q

A diver, working from a DP Vessel, is about to operate a HP Water Jetting gun. Which of the following precautions applies?

a The tender takes up divers slack
b The Dive Supervisor informs the DP Operator on the bridge
c The yellow light in Dive Control is switched on
d The diver’s platform is recovered to surface

A

b

74
Q

A transducer when used as a reference system for a DP Diving Operation can be used:

a With a number of different transponders
b In conjunction with a number of different transducers
c Only if used with a transponder on the end of a taut wire
d Only if used with a transponder on the artemis fixed position

A

a

75
Q

The frequency of a Divers Hand Held Locator is:

a. 37.5 KHz
b. 40.0 KHz
c. 55.5 KHz
d. 73.5 KHz

A

a

76
Q

On the Beaufort scale a strong breeze is:

a. Force 1
b. Force 2
c. Force 5
d. Force 6

A

d

77
Q

Under the IMO after July 1994, how many classes of DP vessels are there?

a) 1
b) 2
c) 3
d) 4

A

c

78
Q

What alarm would indicated a DP “degraded operational status”

a) steady green light
b) steady red light
c) flashing yellow light
d) flashing blue light

A

c

79
Q

In addition to the diving supv, whom should the dp operator inform of an “alert status”

a) LST
b) master and diving supt
c) master and rep client
d) diving supt & clientrep

A

b

80
Q

When diving with anchor patterns, what’s is the minimum distance between the diving stage and any mooring lines?

a) 15m
b) 50m
c) 100m
d) 3m

A

b

81
Q

What’s considered a min safe distance of tault wire from UW structure ?

a) 3m
b) 5m
c) 10m
d) 15m

A

c

82
Q

How far would a platform protrude at 50msw with a batter of 1 in 10?

a) 5m
b) 50m
c) 51m
d) 500m

A

a

83
Q

What’s the average limiting vertical angle of a tault wire when re-location became necessary ?

a) 5 degrees
b) 15 degrees
c) 30 degrees
d) 10 degrees

A

b

84
Q

The vertical tault wire can be deployed and recovered in diving mode with permission of?

a) the master
b) OIM
c) diving supervisor
d) superintendent

A

c

85
Q

When a weather forecast gives the wind direction as veering, which direction is it traveling?

a) north to south
b) clockwise ( sw to w)
c) anti-clockwise
d) east to west

A

b

86
Q

How high should a diving stage or wet bell be kept above a wellhead structure?

a) 5m
b) 10m
c) 15m
d) 20m

A

a

87
Q

What’s the minimum surface visibility considered for safe DP diving ops?

a) 150m
b) 100m
c) decide by master and diving supv
d) decided by dive supt

A

c

88
Q

When fog or mist is possible during diving ops, whom should you consult as to safety?

a) project manager
b) master of the vessel
c) radio op.
d) divers

A

b

89
Q

A DP vessel can be defined as in NORMAL OPERATIONAL STATUS when which of the following apply?

a) the vessel is under DP control and the DP system is operating normally with all the appropriate backup system
b) when thrusters output and total power consumption does not exceed 80% of the maximum thrust or total available power for more than a brief and isolated periods
c) vessels indicated position and heading is within pre-determined limits for all but brief isolated periods
d) when no risk of collision exists
e) all of the above

A

e

90
Q

When a DP vessel is operating a vertical tault wire reference system….

a) the operating radius of the vessel is increased in shallower water
b) the deeper the water, the greater the operating radius of the vessel
c) the operating radius of the vessel remains the same regardless of depth
d) all of the above

A

b

91
Q

The mobile antenna of the Artemis system is…

a) the antenna on the platform or structure
b) the antenna on the vessel
c) neither of the above
d) a combination of one or both of the above

A

b

92
Q

When the vessel moves about its centre vertical axis to compensate for wind or sea does it?

a) list
b) surge
c) yaw
d) sway

A

c

93
Q

Which of the following is not a position reference sensor?

a) tault wire
b) artemis
c) hydro acoustic reference
d) anemometer

A

d

94
Q

Which DP reference sensor system must always be operating during DP diving ops?

a) tault wire
b) Artemis or surface reference
c) INS
d) HPR

A

b

95
Q

What’s the minimum number of independent position reference system in use during DP diving ops?

a) 1
b) 2
c) 3
d) 4

A

c

96
Q

How long should the vessel be held on DP before diving ops commence?

a) 30min
b) 1h
c) 90min
d) 2h

A

a

97
Q

There must be how many qualified persons in the control room at all times when continuous diving?

a) 1
b) 2
c) 3
d) 4

A

b

98
Q

Define significant wave height.

A

Average Height of the largest one third of all waves recorded over a 10 minute period

99
Q

Define the Coriolis effect.

A

A wind driven sea current – not the same direction as the wind but an angle of 45 degrees to it

100
Q

The near by platform has stopped all over the side work because the visibility is so poor the standby vessel could not see any possible man overboard, should?

a Diving stop for the same reason
b Ignore it as it isn’t foggy underwater
c It’s up to the vessel master only to decide
d Haven’t the foggiest idea

A

a

101
Q

An imminent gale warning is…

a) 0-6 hours
b) 6-12 hours
c) 12-24 hours
d) 24-36 hours

A

a

102
Q

Name a rotational degree of freedom controlled by D.P.?

a Surge
b Sway
c Yaw
d Heave

A

c

103
Q

Using the Beaufort scale, a gale is?

a 40-45 knots
b 34-40 knots
c 23-28 knots
d 28-34 knots

A

b

104
Q

What alert must be activated by the DP operator if there is a possible risk of collision?

a Yellow
b Red
c Green
d None

A

a

105
Q

A diver working from a D.P. controlled vessel is about to operate a H.P. water jetting gun, which of the following precautions applies?

a The tender takes up the divers slack
b The diver supervisor informs the D.P. operator on the bridge
c The yellow light in dive control is switched on
d The divers platform is recovered to the surface

A

b

106
Q

Horizontal clearance between a suspended mooring line and a deployed bell or basket, should normally be a minimum of ?

a 100 metres
b 20 metres
c 60 metres
d 50 metres

A

d

107
Q

Define the stages of Gale Warnings.

A

Gale: beaufort scale Force 8, 34‐40 knots
Severe Gale: Force 9, 41‐47 knots
Violent Storm: Force 11, 64 knots or more
Hurricane: Force 12

108
Q

When the wind is Veering, in what direction is it blowing?

A

Clockwise direction.

SW to W exemple

109
Q

When the wind is blowing from SE to NE, what’s the name of it?

A

Backing - Wind in anti clockwise direction.

110
Q

When you hear that the area is expecting a ‘‘Imminent Gale’’, what does it mean?

A

Imminent: within 6h of time
Gale: force 8, wind between 34 - 40 knots

Note: Soon: 6 to 12h
Later: more than 12h

111
Q

Relation to visibility conditions, define the stages of it.

A

Fog: Less than 1000m
Poor: between 1000m and 2nm
Moderate: between 2nm and 5nm
Good: more than 5nm

112
Q

What’s the definition of tides?

A

Is a combination of gravitational effects of the sun and moon.
Rises and Falls every 6h 12min period.

113
Q

What is the difference between ‘‘Spring Tides’’ and ‘‘Neap Tides’’?

A

Spring: When the sun and the moon are aligned and tidal range is at greatest

Neap: When the sun and the moon are at 90⁰ to each other and the tidal range is at lowest.

114
Q

Regards to hazardous areas, zone 2 means?

A

Zone 2: Explosive gas/mixture is unlikely to occur.

note:
Zone 1: Explosive gas/mixture is likely to occur

Zone 0: Explosive gas/mixture always present

115
Q

How many environmental vessel sensors should be online for diving operations?

A 
2 anemometers - preferably different locations and supplies cable routes
2 VRU ( vertical reference units) - with separate cable and routes
3 Gyro compasses
116
Q

What is the accuracy of standard deviation for vessel’s positions references?

A

Each of the vessel’s position references should provide position information accurate to ±2% of the water depth.

For example in 30m of water the information provided by the reference systems should have a standard deviation of ±0.6m

117
Q

Which reference system should be always online?

A

Radio or Surface reference system.

Always 3 different systems

118
Q

Joystick control is acceptable during diving operations.

True or False

A

False

119
Q

Joystick control is not acceptable during diving operations.

True or False

A

True

120
Q

What is the maximum length of umbilical the diver should have it, if his bailout content last 3min 30sec ?

A

35 meters

note: for every 10 meters the diver should have 1 min of bailout.

121
Q

Explain the causes and types of tides ?

A

Tides are caused by the combination gravitational effects of the sun and moon.

Sun and the moon aligned, tidal range is at greatest - Spring tides
Sun and the moon are 90 degrees to each other tidal range at lowest - Neap tide

122
Q

What is the relation between force exerced on a diver and water current velocity?

A

The current is proporcional to the water velocity squared.

If the velocity doubles, the force increases 4 times

123
Q

When you hear that will be a soon near gale, what is that means?

A

Soon means between 6h and 12h weather

Near Gale is wind force 7 speed between 28 and 33 knots

124
Q

How might HP water jetting affects a DP DSV position system?

a) noise and bubbles may affect HPR system
b) hose may get into thrusters
c) jet could damage ships hull
d) hoses may foul divers umbilical

A

a) noise and bubbles may affect HPR system

125
Q

How close can a vessel approach a platform before permission is required from OIM to come closer?

a) 100m
b) 500m
c) 1500m
d) 2400m

A

b) 500m

126
Q

A DP alert would be given when thruster power output exceeds ?

a) 100%
b) 50%
c) 70%
d) 80%

A

d) 80%

127
Q

A vessel has a draft of 5m and thrusters 20m from the diving deployment point. The wet bell is at 40msw. What’s the maximum length of umbilical would you allow paid out?

a) 20m
b) 25m
c) 35m
d) 40m

A

c) 35m

Square 20 + square 40= minus 5 thrusters safety minus 5 draft

128
Q

Using the Beaufort scale describe the wind and sea state for Beaufort number 4 and 7.

A

No 4 – Moderate Breeze (11 to 16 knots) Small waves becoming longer (1-1.5 metres)

No 7 – Near Gale (28 to 33 knots) White foam from breaking waves – beginning to be blown in direction of wind (4.0 – 5.5m)

129
Q

What is the maximum movement recommended for a vessel on D.P. with divers in the water?

(a) 5 metres
(b) 10 metres in steps of 5 metres
(c) 15 metres
(d) 20 metres

A

b

130
Q

What is the minimum number of D.P. position reference systems which should be utilised during diving operations? (Excluding backup systems)

(a) 1
(b) 2
(c) 3
(d) 2 + 1 backup

A

c

131
Q

Underwater welding produces which gas?

(a) CO
(b) CO2
(c) He
(d) H2

A

d

132
Q

Regarding the rigging on an open bottom lift bag, which of the following is most likely to cause problems?

(a) When inflating it
(b) When deflating it
(c) When full & still attached
(d) When topping it up

A

a

133
Q

What is the recommended minimum surface visibility for diving operations?

(a) 100 metres
(b) 200 metres
(c) 1000 metres
(d) 10,000 metres

A

c

134
Q

When using bells with side door systems, on lowering at atmospheric pressure, such as in bounce diving:

(a) The inner and outer doors should be closed on descent
(b) The inner side door should be left open until a seal is proved on the outer side door
(c) The inner side door should be dogged tight
(d) A watch should be kept for a pressure build up between both side doors

A

b

135
Q

When recovering a bell from a saturation dive, the winch driver should observe?

(a) The doors are closed and sealed
(b) The speed of ascent
(c) The external lights are off before leaving the water
(d) The wire spooling on the winch

A

d

136
Q

An acoustic beacon for D.P. location should not be located within what distance of a subsea structure?

(a) 5 metres
(b) 10 metres
(c) 30 metres
(d) 100 metres

A

b

137
Q

Acoustic beacons should be deployed where, to avoid interference with a HPR DP system?

(a) Downwind & up current
(b) Downwind & down current
(c) Upwind & up current
(d) Upwind & down current

A

c

138
Q

When diving from a DP Vessel that is pitching and rolling due to the sea and environmental conditions, which of the following DP Reference systems will be mostly affected by this?

(a) Taut Wire
(b) HPR
(c) GPRS
(d) Fan Beam

A

a

139
Q

What is the common radiation source used offshore?

(a) IR I92
(b) IR 912
(c) D 023
(d) IR 219

A

a

140
Q

Who has the ultimate responsibility of a radiation source during diving operations?

(a) Diving Supervisor
(b) Dive Technician
(c) Radiation Supervisor
(d) LSS

A

c

141
Q

The recommended safe distance from a radiation source during exposure is?

(a) 15 metres
(b) 8 metres
(c) Does not matter as water is a barrier
(d) 3 metres

A

b

142
Q

Breakage and loss of bell umbilical would best be indicated by?

(a) Loss of indication on bell interior pneumo
(b) Loss of bell heating supply
(c) Loss of bell T.V. picture
(d) Loss of pressure on bell umbilical gas line

A

d

143
Q

Using a 500 fsw gauge, what does the reference marked on the gauge, +/-0.25 of 1% refer to in depth?

(a) 0.25 fsw
(b) 12.5 fsw
(c) 50 fsw
(d) 1.25 fsw

A

d

144
Q

A D.P. operator should inform the Diving Supervisor of?

(a) Ship and helicopter movements in the vicinity
(b) Use or intention to use, water jetting equipment
(c) Intention to dump mud, galley waste etc.
(d) Possibility of divers blanking acoustic reference signals

A

a

145
Q

In conditions of reduced surface visibility, decisions about the suitability of conditions for diving from D.P. vessels should rest with?

(a) The Master of the vessel
(b) The diving superintendent
(c) The diving supervisor in the control room
(d) The radio operator

A

a

146
Q

Under the “International regulations for preventing collisions at sea”, vessels engaged in U/W operations must display?

(a) 3 all round lights in a vertical line, the upper and lower being white and middle being red
(b) 3 all round lights in a vertical line, all 3 being white and where they can best be seen
(c) 3 all round lights in a vertical line, the upper and lower being red, the middle being white
(d) 3 all round lights in a vertical line, all 3 being red where they can best be seen

A

c

147
Q

Diving vessels are required to exhibit the diving lights under the “collision regulations” when, they are?

(a) Less than 50m in length
(b) Less than 20m in length
(c) All vessels that are restricted in the ability to manoeuvre
(d) Less than 7m in length

A

c

148
Q

The divers communications fail and the bellman, who cannot see the diver, gives a pull on the diver’s umbilical. He receives a signal of a succession of 2 bells in reply, what would you tell the bellman?

(a) Lock out and investigate
(b) Give the diver more gas
(c) Give the diver less gas
(d) Pull the diver back by his umbilical

A

a

149
Q

What is considered as an upper limit for currents for bell divers carrying out normal work on the seabed according to IMCA D067?

(a) 0.5 knots
(b) 1.0 knots
(c) 1.5 knots
(d) 1.8 knots

A

b

150
Q

A winch used for deploying a standby diver should have?

(a) A pawl or ratchet capable of locking the winch rope drum
(b) An operating lever capable of locking in any position
(c) A clutch capable of engaging during brake failure
(d) A secondary means of braking if auto mechanism fails

A

d

151
Q

When calculating for bell buoyancy what is the standard weight of a fully dressed diver which should be taken into account?

(a) 100 kg
(b) 125 kg
(c) 150 kg
(d) 200 kg

A

c

152
Q

What ASOG stand for?

A

Activity Specific Operating Guidelines

153
Q

On your arrival of a new vessel you have a blue light on DP ASOG. What does it mean?

a. Normal operations - all systems fully functional and operating within acceptable performance limits

b. Advisory status - approaching performance limits or reportable alarm status. Operations may continue whilst
risks are being assessed. A failure has occurred that does not affect DP redundancy

c. Reduced status - Pre-defined performance limits reached, component or system failure resulting in loss of redundancy
d. Emergency status - pre-defined operational or performance limits exceeded, component or system failure resulting in loss of control or position, internal or external emergency situation affecting the vessel

A

B

154
Q

What is your course of action if you see a Blue light on your DP ASOG mode?

a. For DP operations to commence and
continue the conditions in the GREEN column must be met

b. Commence preparation to
safely terminate operations. Specific guidance for vessel types is available in the
appendices

c. Abandon operations. Take immediate action, i.e. initiate emergency disconnect
sequence (EDS) to ensure the safety of people, the environment, the operation and the vessel.

d. Conduct risk assessment to determine whether to continue, change position or cease operations

A

D

155
Q

According to IMCA D067 what is the limit of saturation mid water light work?

a. 0.7 knots
b. 1.0 knots
c. 1.2 knots
d. 1.5 knots

A

B

156
Q

During a saturation on the bottom the current increase to 1.6 knots. According to IMCA recommendations in what category of work is the job placed?

a. Normal work
b. Light Work
c. No diving
d. See Notes

A

C

Note: Diving in currents between 1 and 1.2 knots should not be considered as a normal operation.

157
Q

A DP full functional checks of the operation of the thrusters, power generation, auto DP and IJS and manual controls should be repeated when the vessel returns to the field after an absence of more than?

a. 8h
b. 12h
c. 24h
d. 48h

A

C

158
Q

ESD (Emergency Shut Down) systems should be operable in an advisory mode. They should be designed as

a. Individual shutdown buttons.
b. A cascade function from a higher level to lower levels.
c. There should be a single overall ESD button.
d. should compromise the redundancy concept of the vessel.

A

A

159
Q

According to D023 and D024, DP alarms must to be fitted in the dive control. This alarms should be tested how often?

A

Before Each Dive when operating on DP.

160
Q

A red alert should sound where about in the vessel ou platform?

A

The red alert, accompanied by a distinctive alarm, should additionally sound in the master/OIM’s cabin, operations superintendent’s cabin (if applicable) and the senior diving supervisor’s cabin (if applicable). A local means of acknowledging and silencing these alarms and flashing lights should be provided

161
Q

Determining safe separation limits between the DP diving vessel and an adjacent fixed structure, the vessel position footprint under normal operating conditions should not exceed…

A

50% of a defined critical excursion limit

Bell Diving Supervisors QUESTIONS (15 decks)

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