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Bell Diving Supervisors QUESTIONS > Saturation General Knowledge > Flashcards

Saturation General Knowledge Flashcards

1
Q

Who has legal responsibility for TUP?

a. Superintendent
b. On Shift Dive Supervisor
c. Life Support Supervisor
d. On Shift LST

A

b

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2
Q

During saturation storage you are losing depth at a constant rate. Which of the following action would you take?

a. Check for leaks
b. Maintain depth and check for leaks
c. Maintain depth but ignore the leaks as it is within acceptable limits
d. Inform Superintendent

A

b

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3
Q

While in saturation control a bang is heard followed by the sound of escaping gas, the gauge confirms that the system is loosing depth fast. You have on the panel unlimited amounts of 2%, 8% and 20%, bottom mix is 8%.
What action would you take and what gas would you use?

a. The 8% for at least one full minute then put the divers on BIBs
b. Try and communicate with the divers before adding gas. If it is confirmed,add the 20% for at least one full minute then put the divers on BIBs
c. Put the divers on BIBS then add the 2% for at least one full minute
d. Send someone to look for the problem and at the same time use any gas to maintain depth, the divers should know to go on BIBS without being told

A

d

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4
Q

Using reclaim, the divers gas must be analysed continuously for what and where should it be analysed?

a. Dive control for high and low oxygen and high CO2
b. Gas room for high and low oxygen and high CO2
c. Saturation control for high and low oxygen and high CO2
d. Dive control for low oxygen and high

A

a

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5
Q

Diving bells should be equipped to sustain vital functions in the event of loss of surface supplies for at least a period of:

a. 12 hours
b. 24 hours
c. 48 hours
d. 72 hours

A

b

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6
Q

Bell runs from “lock off” to “lock-on” should not exceed:

a. 4 hours
b. 6 hours
c. 8 hours
d. 12 hours

A

c

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7
Q

A method of heating a divers gas supply is required beyond which depth?

a. 50 msw
b. 70 msw
c. 120 msw
d. 150 msw

A

d

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8
Q
  1. What is the transmitting frequency of the bell emergency transponder?

a 53.5 kHz
b 53.7 kHz
c 73.5 kHz
d 37.5 kHz

A

d

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9
Q
  1. There should be sufficient mixed gas in the bell onboard bottles to allow for?
    a. Sufficient for the diver to remain outside the bell for 30 minutes at a breathing rate of 40 litres/min
    b. Sufficient for the diver to remain outside the bell for 40 minutes at a breathing rate of 30 litres/min
    c. Sufficient for the diver to remain outside the bell for 30 minutes at a breathing rate of 30 litres/min
    d. Enough supply to recover an injured diver
A

a

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10
Q
  1. What is the minimum duration of oxygen required for the bell onboard O2 supply, at the end of the bell run?

a Sufficient for 12 hours
b Sufficient for 24 hours
c Sufficient for 48 hours
d Sufficient for 72 hours

A

b

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11
Q
  1. How long is required for BIBS mix for the divers in the chamber?

a Sufficient for 2 hours BIBS for each diver
b Sufficient for 4 hours BIBS for each diver
c Sufficient for 6 hours BIBS for each diver
d Sufficient for 8 hours BIBS for each diver

A

b

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12
Q

After two hours work the bell diver should be given the opportunity to return to the bell for refreshment

True / False

A

True

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13
Q

Internal divers gas supply should be fitted with a non-return valve?

True / False

A

True

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14
Q

Cross-haul wires used as secondary recovery must be rated with safety factor of 8:1?

True / False

A

True

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15
Q

The ppO2 in the DDC is usually around 0.4 bar?

True / False

A

True

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16
Q
  1. You lose pressure during the TUP of the divers into the bell – what is your immediate action?

a Maintain pressure and transfer divers to a safe area
b Put the bell back in the water
c Call the Superintendent
d Shout loudly

A

a

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17
Q
  1. You lose communications with the diver locked out of the bell – what would you do?

a Deploy the Standby Diver
b Line pulls, flash hat light, free flow pneumo, if no response deploy Standby Diver
c Use through water communication system
d Raise the bell 5 metres

A

b

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18
Q
  1. The diver loses hot water would do you do?

a Try to finish the task
b Diver return to bell and recover bell if back up heating cannot be established
c Deploy Standby Diver
d Call the Dive Technician

A

b

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19
Q
  1. Who is responsible for a TUP procedure – LST, LSS, Dive Supervisor or Diving Superintendent?

a Life Support Supervisor
b Diving Superintendent
c Diving Supervisor
d Camp Boss

A

c

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20
Q
  1. If the bell primary communications failed, what would your first action be?

(a) Jump the standby diver
(b) Use Emergency Telephone
(c) Use Through Water Comms
(d) Raise bell 3 feet

A

b

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21
Q
  1. If the bell main power failed, would you?

(a) Call the diver back to the bell
(b) Call the DP operator
(c) Jump the standby diver
(d) Flash external lights to warn diver(s)

A

a

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22
Q
  1. If the diving bell was entangled on an underwater structure, what would you do first?

(a) Inform D.P. Operator (DPO)
(b) Slack main wire
(c) Get diver to lock out and investigate
(d) Slack the umbilical

A

a

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23
Q
  1. You are unable to T.U.P. from bell to chamber after a bounce dive. What would you do first?

(a) Contact shore base for advice
(b) Switch to saturation decompression
(c) Get the divers into their survival bags
(d) Continue the decompression table

A

d

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24
Q
  1. Your diver is suffering from oxygen toxicity (wrong gas was supplied via his umbilical) and is about to go into convulsion in the bell, what would you advise the bellman to do?

(a) Leave the divers hat on, but switch to onboard gas
(b) Put the diver on B.I.B.S
(c) Remove hat and protect the diver from injury
(d) Put the diver on an emergency re-breather

A

c

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25
Q
  1. Your bell man is suffering from hypercapnia, what would you advise the bellman to do?

(a) Put the standby divers hat on, and switch to onboard gas
(b) Put on BIBS, Flush through and change soda sorb cannister
(c) Insert a mouth gag and restrain the diver
(d) Put the diver on an emergency rebreather

A

b

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26
Q
  1. If the gas supplied to the bell fails for some reason, would you?

(a) Tell divers to seal inner lower door and repair fault
(b) Get divers into bell and tell them to standby
(c) Divers switch to onboard gas. Abort dive and recover bell
(d) Finish job with onboard gas, then recover bell

A

c

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27
Q
  1. The main gas umbilical supply on the bell for the diver must be fitted with?

(a) A quick connector
(b) A flow fuse
(c) An in line filter
(d) A non-return valve

A

d

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28
Q
  1. During a saturation dive, both your diver and bellman go unconscious in the bell at 120m. The lower doors are open. As the Diving Supervisor, what action would you take next?

(a) Raise bell to 60m as quickly as possible
(b) Flush bell atmosphere with oxygen
(c) Flush bell atmosphere with bottom mix (in this case 5/95)
(d) Lower bell 33m

A

c

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29
Q
  1. Secondary bell communications should be by?

(a) Emergency telephone
(b) Through water comms
(c) Flashing lights
(d) Umbilical line pull signals

A

a

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30
Q
  1. A bellman’s first action when told to lockout to rescue an unconscious diver is?

(a) Flood trunking
(b) Test bellmans comms
(c) Switch the diver to onboard gas
(d) Deploy rope lifting device

A

c

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31
Q
  1. If your bell was lost (main lift wire, guide wires and umbilical parted), what would you do first?

(a) Mark the location with a buoy
(b) Call the bellman on Through Water Comms (TWC)
(c) Launch an R.O.V.
(d) Call safety officer at diving contractor office

A

b

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32
Q
  1. Bell life support equipment ought to have a minimum duration of?

(a) 12 hours
(b) 24 hours
(c) 48 hours
(d) 72 hours

A

b

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33
Q
  1. A bell should have an adequate supply of emergency onboard gas to permit each diver?

(a) To return safely to the diving bell
(b) To clear himself if fouled and return to the bell
(c) To remain outside the bell for a minimum 15 mins
(d) To remain outside the bell for a minimum 30 mins

A

d

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34
Q
  1. A bell oxygen make up system should be fitted to?

(a) All transfer under pressure (TUP) bells
(b) All wet bells
(c) Every diving system
(d) All bells working deeper than 50m exposed to internal pressure

A

a

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35
Q
  1. All TUP bells must be fitted with a relocation transponder operating at?

(a) 73.5 KHZ
(b) 53.7.7 KHZ
(c) 3.75 KHZ
(d) 37.5 KHz

A

d

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36
Q
  1. How long prior to a dive are bell checks normally valid?

(a) 24 hours
(b) 6 hours
(c) 30 days
(d) 3 months

A

b

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37
Q
  1. An oxygen analyser with Hi / Lo visual and audible alarms is required?

(a) To monitor passageways to onboard storage gas rooms
(b) Downstream of the divers supply gas in dive control
(c) In the machinery container
(d) On deck at the gas storage area

A

b

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38
Q
  1. The bell may only be unmated from the system with the direct permission of?

(a) Diving Superintendent
(b) Diving Supervisor
(c) DPO or Captain of the vessel
(d) Winch operator

A

b

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39
Q

All HP/LP gas supply hose must be secured at the end with hold backs?

True / False

A

True

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40
Q

It does not matter if the gas quads are analysed before putting the gas on line to the control panel as the gas is analysed at the panel before it is used?

True / False

A

True

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41
Q

The percentage where oxygen is categorised as 100% is when the mix has 25% or more oxygen content?

True / False

A

True

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42
Q

The divers breathing gas must be analysed before being put online to the diver and continuously while in use?

True / False

A

True

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43
Q

Oxygen should be reduced to 40 bar maximum at the source under normal operating procedures?

True / False

A

True

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44
Q

The Life Support team must maintain gas quantity records during the diving project?

True / False

A

True

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45
Q

The colour code for a cylinder containing Air is the cylinder neck is brown and white quarters?

True / False

A

False

Air Cylinder: Neck Black and white. Grey body

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46
Q
  1. What is the minimum oxygen % in mixed gas permitted offshore?

a 2%
b 4%
c 6%
d 8%

A

A

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47
Q
  1. What is the minimum oxygen % in Nitrox mixes permitted offshore?

a 2%
b 4%
c 6%
d 8%

A

a

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48
Q
  1. In which document will you find minimum gas requirements?

a IMCA D014
b IMCA D018
c IMCA D024
d IMCA D050

A

d

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49
Q
  1. The minimum % O2 in helium allowed at an offshore dive site is?

(a) 1.5%
(b) 2%
(c) 2.5%
(d) 0.5%

A

b

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50
Q
  1. In which circumstances can helium mixtures contain less than 2% at an offshore dive site?
    (a) Geographical location makes it difficult to obtain supplies of 2% HeO2
    (b) Agreed by the client and diving contractor, risk assessed & a designated person appointed to be responsible for all mixtures of less than 2%
    (c) Where the use of 2% mixtures would be too rich for the planned working depth
    (d) All of the above
A

d

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51
Q
  1. Analysers should be calibrated every how often?
    (a) According to national regulations or manufacturers’ instructions
    (b) According to company procedures
    (c) When the operator suspects the analyser to be out of calibration
    (d) All of the above
A

d

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52
Q
  1. Gas should be analysed when?

(a) When a new quad arrives onboard
(b) Before the gas is put ‘on-line’
(c) After mixing
(d) All of the above

A

d

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53
Q
  1. After gas mixing & before using the contents, the gas is clear to be used?

(a) After 12 hours
(b) After 24 hours
(c) As decided by the Life Support Supervisor
(d) As decided by the Diving Supervisor

A

b

54
Q
  1. When mixing gas, in addition to using a gauge as large as possible, which of the following should be used?

a) A calibrated gauge with large divisions
(b) A calibrated gauge with small divisions
(c) Whatever gauge is available on the vessel
(d) Trial and Error method

A

b

55
Q
  1. Gas supplies and deliveries should be recorded where and by who?

(a) Gas board
(b) Gas log
(c) Designated gas man or LSS
(d) All of the above

A

d

56
Q
  1. It has been discovered that a 28% HeO2 mix has been inadvertently stored below decks in the onboard storage. What should be the initial actions?

(a) Report
(b) Make the area safe
(c) Arrange a meeting to formulate
(d) All of the above a plan to correct the situation

  1. Assuming from the above question, that a plan has been agreed, risk assessed, reviewed and approved; which of the following would, in your opinion, be the best plan?

(a) Pump the contents from storage to a quad on deck
(b) Decant the contents from storage to a quad on deck. The remaining gas to be diluted to make a weaker mix
(c) Decant the contents from storage to a quad on deck. The remaining gas to be pumped from storage to a quad on deck
(d) Decant from one storage tube to the other then pump both to a quad on deck

A
  1. D
  2. B
    PS: Remember O2 should not be pumped!
57
Q
  1. A 16 bottle deck quad has arrived onboard which appears to be in a poor state of repair with copious rust corrosion and pitting particularly around the pillar valves. Which of the following actions would you take?
    (a) After analysing the contents, transfer the gas immediately to another safe storage
    (b) After analysing, put on-line to be used immediately
    (c) Isolate the quad, put up signs and barriers and backload the quad as soon as possible
    (d) Use the quad as normal
A

c

58
Q

DMAC 031 provides guidance on medical equipment in saturation?

True / False

A

False

DMAC 28 The provision of emergency medical care for divers in saturation

DMAC 31 Accelerated emergency decompression (AED) from saturation

59
Q

Chamber environmental parameters must be logged every 30 minutes?

True / False

A

False

Should logged every hour

60
Q

The ppO2 in the chamber is usually about 400mb?

True / False

A

True

61
Q

When operating the oxygen injection to the chamber using a manually operated Valve, you can open the valve and then continue to do other work?

True / False

A

False

62
Q
  1. What are the first actions of the divers on discovering a fire in the chamber?

a On Bibs, raise alarm, try to fight the fire.
b Go to Hyperbaric Rescue Unit
c Vent the chambers 20 metres
d Let the LSS deal with it

A

a

63
Q
  1. As LST crew, what are your actions on hearing the ships fire alarm?

a If not at SAT control, return to SAT control and follow instruction of LSS

b Assist in moving the divers to the HRU

c Once the divers are transferred to the
HRU, go to your own lifeboat station

d All of the above

A

d

64
Q
  1. What bore pipe would normally be used for depth and analysis lines?

a Large bore
b Medium bore
c Small bore
d Any of the above

A

c

65
Q
  1. According to IMCA D018 Detail sheet 25.2, how often should viewports be replaced?

a 5 years from date of manufacture
b 10 years from date of installation
c 10 years from date of manufacture
d 20 years from date of installation

A

c

66
Q
  1. An internal ECU removes humidity by which process?

a Purification
b Hydration
c Osmosis
d Condensation

A

d

67
Q
  1. What is the function of prophylactic ear drops?

a No effect
b To treat ear infection
c Improve hearing
d To prevent ear infection

A

d

68
Q
  1. What are the hazards of split-level saturations?

a No additional hazards
b Leaks through door seals / unbreathable atmosphere / common lines
c Divers getting lost
d Supervisor confusion

A

b

69
Q
  1. IMCA D018 (detail sheet 25.1) recommends that PVHO’s (Pressure Vessels for Human Occupancy) should have an internal overpressure test (or other testing as agreed by an international classification society), plus a gas leak test at full working pressure every how often?

(a) 6 Months
(b) 2 ½ Years
(c) 5 Years
(d) Annually

A

c

70
Q
  1. Flammable materials should be removed from a Heliox saturation chamber during decompression when the O2% reaches?

(a) 25%
(b) 6%
(c) 50%
(d) 100%

A

b

71
Q
  1. Which of the following is the recommended saturation storage depth ppO2 level?

(a) 0.21 – 0.35
(b) 0.35 – 0.5
(c) 0.45 – 0.5
(d) 0.5 – 0.6

A

b

72
Q
  1. You are the Diving Supervisor and there is a sudden loss of pressure whilst transferring the divers from the entry lock to the bell during a TUP. What would you do?
    (a) Call the diving supervisor / LSS
    (b) Try to maintain pressure whilst transferring the divers to a secure compartment
    (c) Inform divers to close doors
    (d) Call the master
A

b

73
Q
  1. Your bellman is suffering from oxygen toxicity (too much O2 supplied during make up) and is about to go into convulsion in the bell. What would you advise to do?

(a) Vent the bell to get the correct ppO2
(b) Put the diver on BIBS & flush the bell
(c) Tell the diver to lay down to prevent injury
(d) Put the diver on an emergency rebreather

A

b

74
Q
  1. If your chamber CO2 analyser high alarm sounded, would you?
    (a) Call the DP operator
    (b) Warn the diver first
    (c) After verifying the flow, inform the divers in the chamber that the soda sorb requires changing and change out the soda sorb
    (d) Get one of your team to check the supply quad
A

c

75
Q
  1. Which of the following normal living parameters within the chamber during saturation would be regarded as suitable?
    (a) Temp 25-40oC, 600mb O2, CO2200ppm, Nitrogen 10mb, Humidity 55-70
    (b) Temp 25-33oC, 400mb O2, CO2<5mb, Nitrogen <1000ppm, Humidity 50-70
    (c) Temp 25-30oC, 500mb O2, CO2200ppm, Nitrogen 10mb, Humidity 20- 40
    (d) Temp 40-60oC, 500mb O2, CO2200ppm, Nitrogen 10mb, Humidity 70 – 80
A

b

76
Q
  1. When operating the medical lock who should you obtain permission to carry out the operation from?

(a) Diver inside the chamber
(b) Diving Technician
(c) Life Support Supervisor
(d) DPO

A

c

77
Q
  1. During a saturation, the BIBS mixture ‘on line’ to the chambers will normally be?

(a) Oxygen
(b) A treatment mix suitable for the depth
(c) Bottom mix
(d) As decided by the LSS

A

c

78
Q
  1. During a saturation, whose decision is it during an emergency situation, to go on BIBS?

(a) LSS
(b) Diving Supervisor
(c) Divers in saturation
(d) Diving Superintendent

A

c

79
Q
  1. During saturation, DDC BIBS supply external valves should normally be in the ………. position, so to be immediately available to the divers in the event of an emergency?

(a) Closed
(b) Open
(c) Does not matter as long as relevant personnel know which position they are in
(d) Half open

A

b

80
Q
  1. BIBS masks, supply valves & dump valves must all be?

(a) Quarter turn valves
(b) Stainless steel
(c) Have warning labels
(d) Oxygen clean

A

d

81
Q
  1. All chamber hull penetrations must have?

(a) Blanking plugs
(b) Either blanking plugs or valves on both sides
(c) Filters
(d) Silencers

A

b

82
Q
  1. Saturation chamber control must have which of the following?

(a) Voice communication with dive control
(b) Emergency lighting
(c) Emergency breathing apparatus for Life Support personnel
(d) All of the above

A

d

83
Q
  1. In the event of a contaminated DDC atmosphere, there should be sufficient gas to allow each diver?

(a) 4 hours breathing on BIBS at the deepest bottom depth
(b) 4 hours breathing on BIBS at the deepest treatment depth
(c) 4 hours breathing on BIBS at the deepest excursion depth
(d) 4 hours breathing on BIBS at the deepest storage depth

A

d

84
Q
  1. Emergency gas reserves are?

(a) To ensure the job can always be finished
(b) To be kept as a reserve & not used for diving
(c) To ensure peace of mind
(d) To allow the onboard gas bottles to be charged

A

b

85
Q
  1. During saturation, minor injuries should be?

(a) Treated but not reported immediately
(b) Not reported unless the condition worsens
(c) Reported & treated immediately
(d) All of the above

A

c

86
Q
  1. The chamber environmental log should be recorded every how often?

(a) Every hour
(b) Every 12 hours
(c) Every 24 hours
(d) Every 30 minutes

A

a

87
Q
  1. If a chamber or bell with the correct heliox atmosphere to support human life at 100 msw, is brought to the surface, what will become of the atmosphere in the chamber or bell?

(a) Anoxic
(b) Hyperoxic
(c) Remain breathable
(d) Unbreathable / hypoxic

A

d

88
Q

IMCA D053 is the DESIGN Audit document for the HRF?

True / False

A

True

89
Q

The HRU should be capable of maintaining suitable living conditions for a minimum of 60 hours?

True / False

A

False

90
Q

IMO Resolution A.692(17) provides guidance & specifications for HES?

True / False

A

True

91
Q

There are four distinct phases from launch of the HRU to safe decompression of the divers?

True / False

A

True

92
Q

When working within the framework of IMCA guidance a HRF is required

True / False

A

True

93
Q

The initials HRU mean Hyperbaric Rescue Underwater?

True / False

A

False

Hyperbaric Rescue Unit

94
Q

Hyperbaric evacuation drills should be carried out on a regular basis?

True / False

A

True

95
Q

The HRU must be launched every 3 months for drill and testing?

True / False

A

False

Every 6 months

96
Q

What is the duration the HRU is required to sustain life of its occupants?

a. 24 hours
b. 48 hours
c. 72 hours
d. 12 hours

A

c

97
Q
  1. What are the 4 phases of HRU launch and which is the correct order?
    (a) Transfer divers to HRU, launch HRU, decompress divers, and transit HRU to reception site.
    (b) Transfer divers to HRU, initiate decompression, launch HRU and transit HRU to reception site.
    (c) Transfer divers to HRU, launch HRU, transit HRU to reception site and decompress divers
    (d) None of the above
A

c

98
Q
  1. A HRU should be capable of supporting life for a minimum of?

(a) 12 hours
(b) 24 hours
(c) 48 hours
(d) 72 hours

A

d

99
Q
  1. Which of the following are not subject to SOLAS requirements?

(a) HRU
(b) SPHL
(c) HRC
(d) DDC

A

d

100
Q
  1. Which of the following IMCA documents gives guidance on hyperbaric evacuation systems?

(a) D 050
(b) D 051
(c) D 052
(d) D 053

A

c

101
Q
  1. The Life Support Package (LSP) should provide?
    (a) Gas mixtures, heating, cooling, toilet facilities
    (b) Power supply, gas mixtures, heating, cooling, toilet facilities
    (c) Power supply, gas mixtures, ice treatment, heating
    (d) Electrical supply, entertainment, newspaper, wi-fi
A

b

102
Q
  1. What is the simple definition of a SPHL?
    (a) A pressure vessel contained in a conventional lifeboat with a support crew onboard
    (b) A pressure vessel without a support crew
    (c) Steam powered hyperbaric lifeboat
    (d) Emergency evacuation
A

c

103
Q

According to IMO guidelines and specifications for hyperbaric evacuation systems: Resolution A.692 (17), how often should HRU be launched for testing purposes?

(a) 1 month
(b) 3 months
(c) 6 months
(d) 12 months

A

c

104
Q
  1. Readiness for evacuation of divers in a HRU should be?

(a) Regular practice
(b) Constant readiness
(c) A last resort action
(d) All of the above

A

D

105
Q
  1. A ‘Safe Haven’ is defined as?

(a) When the divers are in the HRU
(b) When the HRU is launched
(c) Where the divers are within 3 nautical miles of the reception facility
(d) Where the HRU arrives on completion of transit.

A

d

106
Q
  1. Arrival at the ‘Safe Haven’ should be planned to be within what percentage of the HRU designed endurance?

(a) 25 %
(b) 50%
(c) 75%
(d) 100%

A

c

107
Q

What a heave compensation is designed for?

A

to minimize out the effects of the vessel’s motion on the bell main cable

108
Q

What is important to know about the Bell winch system?

A
  • should have a back-up power supply to the main winch
  • secondary winch system / motor with back-up power supply
  • Guide wires - capable of lifting the bell as should cross-haul wires
109
Q

What are the requirements of PPO2 of bailout bottles?

A
  • DMAC 04 Rev.2 recommends that the maximum ppO2 in a bail- out bottle should be 1.4 bar
  • The minimum ppO2 supplied to the diver from the bailout should ideally be the same as the ppO2 in the divers primary supply
  • The absolute minimum ppO2 in a bailout is 0.4 bar
  • In closed bell & diving from a wet bell the volume of available gas in the ballout is based on 10 metres (33 ft) of umbilical can be deployed for every full minute of duration
110
Q

What are the basics of transfer under pressure ?

A
  • Doors must stay closed at all times unless divers are moving between bell and chamber
  • All systems must have pressure Interlocks
    If there is any unusual difficulty in opening the trunk clamp, this may indicate that regardless of pressure gauges and interlocks there is still pressure in the trunking
  • The Diving Supervisor is directly responsible for the control of the TUP operation
111
Q

In case of LOSS OF GAS SUPPLY

The Diving Supervisor should…..

A
  • Change over to the back- up supply immediately and inform diver
  • Switch over to the onboard supply in bell
  • Free-flow the divers pneumo
112
Q

In case of Loss of Pressure at Depth the Diving Supervisor should….

A
  • If the bell cannot be lifted without loss of pressure, likely causes are valves left open or a damaged ‘O’ seal on the bell door. Every bell should carry a valve closure checklist and a spare ‘O’ seal.
  • If the problem cannot be dealt with, the divers should await a wet transfer. If necessary they should put on survival equipment.
  • If the pressure loss only starts to occur after the bell has been lifted, it may be lowered back to working depth to allow the Diving Supervisor and divers to assess the situation.
113
Q

In case of lifting gear failure, what are the course of actions?

A
  • If the bell cannot be lifted, the divers should await intervention to free the bell or wet transfer
  • Another cable should be attached before the bell is lifted clear of the water
  • Every winch should have at least one back-up power supply
  • Possible to lift the bell into the air range using the umbilical
114
Q

You have a contaminated atmosphere in the bell. What are the actions of diver or diving supervisor?

A
  • Divers and/or Supervisor should flush bell
  • Divers returning to bell should not remove helmet
  • Dives on BIBS and inform Supervisor
115
Q

What are the safety considerations for choose the right mix ?

A
  • We need supply to the diver, a safe ppO2 at the working or storage depth
  • The amount of inert gas dissolved in the diver’s tissues and thus the decompression time depend on the partial pressure of the inert gas
  • The lower the ppHe, the shorter the decompression
  • Keeping the ppO2 as high as possible reduces inert gas in divers body
  • However, if the pp02 is too high, the divers would suffer from chronic or acute Oxygen Poisoning
116
Q

You add 10cm of oxygen in the bell, how much does increase in the PO2 meter?

A
  • 10cm (0.1 msw) of oxygen increases the PO2 by 10mb

Note:

  • 1 fsw of oxygen increases the pO2 by 0.03ata
  • 1 msw of oxygen increases the ppO2 by 0.1bar
  • 3 fsw of oxygen increases the ppO2 by 0.09ata
117
Q

What is the consequences of inhaling pure inert gas helium ?

A

Inhaling pure inert gas flushes oxygen from the diver’s tissues, causing immediate collapse followed quickly by death

118
Q

What are the potential hazards in a DIVER gas recovery systems?

A
  • Unsafe PO2 - Excessive levels Too high or too low oxygen analyser with audible and visual hi-lo alarm
  • Excessive levels of contaminants in the recovered gas
  • Failure of the exhaust line which could cause a pressure drop in the diver’s helmet and a possible squeeze
119
Q

What are the potential hazards of CHAMBER gas recovery systems?

A
  • Gas from chamber exhausts and medical locks is directed & collected in a large gas bag
  • Automatically pumped through a filtration system and returned to HP quads for re-use
    In the latter stages of decompression - oxygen percentage may be too high for re-use
  • Nitrogen levels in reclaimed gas need to be monitored
  • Some chamber recovery systems incorporate molecular filters which can remove all gases except helium
120
Q

What a supervisor should have knowledge of managing gas supplies?

A
  • Control of a diver gas recovery system remains with the Diving Supervisor
  • Gas Supplies Managed by a dedicated gasman or a Life Support Technician under overall responsibility of the Life Support Supervisor
  • The content, pressure, volume and location of every quad should be shown on the gas board
  • Gas log, recording all deliveries, dispatches, gas transfer or gas mixing
121
Q

What are the Methods of mixing gas offshore?

A

Blender / Mixmaker / Decanting

Decanting use:

Calibrated gauge with small divisions

Minimum of 24 hours before use

122
Q

Gas supplies are normally managed by a dedicated gasman or a life support technician. They are normally under the overall responsibility of the life support supervisor. How often gas board should be updated?

a. once daily
b. twice daily
c. every second day
d. at least 5 times a week

A

a. once daily

123
Q

In a decanting procedure Any empty cylinder to be used must be ‘washed out’ by partially filling it with the mixture of which the greater volume is to be used and then released to atmosphere.

True or False

A

True

124
Q

When Deployment of Divers Using In-Water Tending Points, This can be carried out in either saturation or air diving mode and utilises a device (basket or similar) suspended from the cherry picker, crane or working platform on the vessel.
The device must be man ridding lifting certified

True or false

A

False

PS: It is preferred but not essential that the basket be deployed on a man riding lifting device.

125
Q

About the minimum gas quantities requirements for offshore. Where the amounts should be displayed?

A

Dive control and in saturation/chamber control.

126
Q

About calibration gases, what you should know?

A
  • If the analysers cannot be calibrated prior to the dive then the dive cannot be carried out.
  • Sufficient quantities of calibration gases should be carried to complete the anticipated project scope
  • Consideration should be given to having two sources of each calibration gas on site, one designated for use and one as a spare.
  • For short mobilisations or work scopes consideration should be given to providing two smaller bottles of calibration gas rather than one larger one
  • D022 states a minimum quantity of 3 weeks supplies.
127
Q

Positioning the ROV or its tether below the bell during a bell run is not acceptable.

True or False

A

True

128
Q

What is the minimum safe working distance around the active WROV into which the diver should not enter?

A

4 meters

129
Q

Regular testing of all ROV line insulation monitor (LIM) systems should be undertaken and logged. How often?

A

On a 24 hourly basis during long dives.

130
Q

In respect to ROV and diving operations, How can you describe a simultaneous operation (SIMOP)

A
  • SIMOPS is defined as two or more separate work tasks being undertaken in different areas at the same time.
  • SIMOPS can be described as the potential clash of activities which could bring about an undesired event or set of circumstances.

Bell Diving Supervisors QUESTIONS (15 decks)

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