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Bell Diving Supervisors QUESTIONS > Possible General Questions > Flashcards

Possible General Questions Flashcards

1
Q

At what depth is considered to be a Deep diving?

a. 50m
b. 100m
c. 150m
d. 180m

A

d

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2
Q

DMAC 20 Rev 1 Provides Guidance on Bell Lockout durations state maximum period that the divers will remain in saturation is….

A

This is normally 28 days including decompression.

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3
Q

What is the maximum allowed time a diver can spend in the water and how long the bell run should last?

A

No diver should spend more than 6 hours in water out of the bell. After 2 hours work he should be given the opportunity to return to the bell for refreshment.
A bell run should not last more than 8 hours from seal to seal.

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4
Q

When a diving project is considered finished?

A

When all divers have returned to atmospheric pressure and remained in close proximity to a recompression chamber for a specified time in case there is a need for treatment of decompression symptoms.

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5
Q

What is the absolute minimum team size to support divers during a closed bell operation and 24 hours life support operations?

A

9

➢ Diving supervisor
➢ Two life support supervisors
➢ Two life support technicians
➢ Two divers in the bell
➢ Standby diver on the surface
➢ Tender for the standby diver
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6
Q

Regards to valves in the Diving Bell, what you should know? with what type of valves?

A

The circuit supplying the diver’s gas should be fitted with a non-return valves and clearly labelled externally and internally.

O2 lines fitted with needle valves which are normally open.

Valves (except those carrying oxygen at more than 15 bar absolute), should be fitted with a quarter turn valve and are normally open.

At all times the diving supervisor shall have the control of the bell blow down supply to the bell.

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7
Q

In case of Emergency Isolation of Gas Circuits in the Event of a Ruptured Bell Umbilical, AODC009 recomends?

A
  1. Every bell carries an emergency waterproof checklist of all valves that must be closed or opened. A duplicate should be kept in dive control.
  2. The contingency plan with procedure for completing this checklist and confirming the operation with the Diving Supervisor via through water communications.
  3. Photographs of all internal and external bell valves should be available in dive control.
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8
Q

What you should be aware of regarding to on board gas in the Diving Bell?

A
  1. designed to supply the diver if the surface supply fails. It is normally arranged to come on-line automatically if the surface supply pressure drops below a set level. It usually incorporates an audible and visual indication.
  2. There must be an emergency supply of gas sufficient to support each working diver plus the bellman outside the bell for a minimum of 30 minutes at a breathing rate of 40 litres (1.5 ft3) per minute at the maximum depth of the diving operation.
  3. Sufficient O2 must be available for metabolic consumption by the maximum number of divers at 0.5 litres/minute per diver for at least 24 hours at the end of a bell run.
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9
Q

In case of Emergency, the diving bell should be fitted with a minimum equipment required. What are they?

A
  1. Lifting equipment suitable for lifting an injured or unconscious diver into the bell.
  2. Must be equipped with a location transponder using the internationally agreed frequency of 37.5 kHz.
  3. An internationally agreed common manifold block for attachment of an emergency umbilical.
  4. On-board gas supplies and survival systems must be capable of sustaining the divers for at least 24 hours. Personal survival equipment should be provided for each diver.
  5. Adequate supplies of soda lime.
  6. several means of communication: helium scramble, sound powered phone, through water communications, Tapping code.
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10
Q

AODC 061 considers that the release of the bell weights is the least desirable option.

True or False?

A

True

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11
Q

Wet transfers to another bell, is one of the ways to recovery of stranded divers.

True or false?

A

True

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12
Q

In a Emergency situation with a tapping code you open communication procedures with the bell (3.3.3). The diver answer with (1.2.3).
What that means?

A

(1.2.3) Do increase your pressure.

PS: have a good look in tapping code procedures.

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13
Q

What are the types of cursos in the bell handling system? Explain them.

A

Passive: simply rests on the bell and moves with it up or down the guide rails. The bell winch takes the weight of both the bell and the cursor.

Active: has its own winch, separate from the bell winch, and during deployment and recovery through the vessel moonpool the bell is locked inside the cursor. The cursor winch takes the weight of both the bell and the cursor.

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14
Q

What are the methods used on cross hauling systems? Explain them.

A

Static Line: Necessary to have sufficient water depth to adequately compensate for the length of the cross-haul wire rope sling (the static line). The water depth at the cross-haul location needs to be accurately determined. The sling should in turn be of the correct length to enable it to be run underneath/along the vessel/barge or across the structure to reach the remote point at which the load transfer commences underneath the bell launch position.

Winch Operated: The winch operated method allows the cross-haul wire (winch wire) to be adjusted up or down during the cross haul operation.

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15
Q

According to IMCA D050, what is the minimum quantities of gas for saturation diving?

A

a. Sufficient mixed gas to carry out the intended bell run.
b. Sufficient mixed gas to pressurise all deck chambers required for the operation to the maximum intended storage depth.
c. Sufficient gas to allow a full decompression from the storage depth to the surface.
d. Sufficient oxygen to allow for metabolic consumption (0.5l/m) by each diver plus that required to maintain the ppO2 during decompression.

All of the above stated should be double!!

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16
Q

In the chamber what is the minimum gas should be available for Bibs in case of contaminated atmosphere?

A

For all mixed gas diving there must be sufficient gas available to allow every diver in the chamber 4 hours breathing on the BIBS on storage depth.

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17
Q

Before start a saturation project, what should be the minimum amount of calibration gas available?

A

There should be a minimum of 3 weeks supply of calibration and zero gas for the analysers. This reserve should be maintained during the saturation.

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18
Q

The minimum duration of oxygen required for the bell onboard O2 supply, at the end of the bell run is?

A

24h

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19
Q

DMAC 04 Recommends in Open Circuit Bail-out Bottles for Heliox Saturation Diving the oxygen content should be?

A

Maximum of 1.4 bar
Minimum of 0.4 bar

PS: In closed bell & diving from a wet-bell, the volume of available gas in the bailout is based on a requirement of 10 metres of umbilical can be deployed for every full minute of bailout bottle duration,

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20
Q

Who is directly responsible for the control of the TUP operation?

A

Diving Supervisor

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21
Q

What you should know about bell checks?

A

a. Must be carried out before every bell run

b. Usually valid for 6 hours.

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22
Q

What the parameters of PPO2 it should be maintain in the chamber and in the bell?

A

Chamber: 0.35 - 0.5 (normally 0.4bar)
Bell: 0.6 - 0.9 bar

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23
Q

According to IMCA international code of practice for offshore diving must contain a minimum percentage of oxygen, which is?

A

2%

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24
Q

What are the potential hazards it can be found in diver gas recovery system?

A

a. Failure of the exhaust line which could cause a pressure drop in the diver’s helmet and a squeeze.
b. Excessive levels of contaminants in the recovered gas.
c. Unsafe ppO2. The diver’s gas supply needs to be monitored by an oxygen analyser with an audible and visual hi-lo alarm

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25
Q

State the outlines for decanting procedures for mixing gases.

A

a. Calibrated accurate gauges with small divisions.
b. new mix must be left for a MINIMUM OF 24 HOURS to complete homogenisation.
c. Accurate final mix analysis must be done and the cylinder clearly marked and colour coded

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26
Q

Depth gauge connection and the analysis valves are usually small bore.

True or false

A

True

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27
Q

Crossover systems are widely used on analysis lines on saturation systems, with one analyser switched between several chambers.

True or False

A

True

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28
Q

Crossover systems, in which one gauge serves two chambers and is switched between them is widely used.

True or False

A

False

They are potentially very dangerous and must never be used.

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29
Q

What are the requirements for Oxygen and Decompression?

A

The ppO2 is raised to a higher level before starting decompression

The required pp02 is then maintained during the decompression

Every time gas is vented out of a chamber, the ppO2 will drop and more oxygen must be added to maintain the correct ppO2

As the chamber gets shallower, the oxygen represents a higher percentage of the total volume, and the volume of oxygen coming out increases

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30
Q

BIBS masks requirements are?

A

Suitable stowage
Immediately available
Oxygen clean

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31
Q

What are the Environmental control units made for?

A

They can be internal and external

  • Carbon dioxide scrubbing
  • Heating
  • Cooling
  • Humidity
  • Moisture is extracted condensation
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32
Q

What is used to remove Carbon Dioxide (CO2) from chambers ?

A

Carbon Dioxide (CO2) is removed from chambers using a chemical absorbent

The most commonly used chemical is soda lime or sodium hydroxide

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33
Q

About CO2 removal, how much 1 kg of soda lime will absorb?

A

1 kg of soda lime will absorb about 120 litres of carbon dioxide

This is about 0.72m3 or 720 litres per day

A diver in a chamber produces as much carbon dioxide as the oxygen he uses

Just like metabolic oxygen use, carbon dioxide production is not affected by depth

1 kg of soda lime will last a diver for 4 hours

6 kg of soda lime will last a diver for 24 hours

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34
Q

About Chemical sampling tubes, what the supervisor should be aware of?

A
  • The True % could be called the True PPM or True PP depending on the measurement in use
  • The True reading refers to the reading one would get from an analyser reading at surface in the control room
  • Consider the True Percentage is the reading on the surface analyser
  • True percentage% = Scale reading/
    Absolute pressure
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35
Q

What is the maximum allowed SEP in the Bell and DDC?

A

In a bell is 2% or partial pressure of 20 mb or 20000ppm

In a DDC is 0.5% or partial pressure of 5mb or 5000ppm

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36
Q

About Gas supplies, the supervisor should always be aware of?

A
  1. For all mixed gas diving IMCA D050, there must be sufficient gas available to allow every diver in the chamber 4 hours breathing on the BIBS in case the chamber atmosphere becomes contaminated.
  2. Sufficient mixed gas to carry out the intended bell run, plus the same quantity as a reserve.
  3. Sufficient mixed gas to pressurise all deck chambers required for the operation to the maximum intended storage depth, plus at least an equal amount in reserve
  4. During the operation, the reserve of gas sufficient to completely pressurise the chambers must be maintained
  5. Sufficient gas to allow a full decompression from the storage depth to the surface twice, allowing for the normal daily consumption (This quantity to be doubled for safety reasons)
  6. Sufficient oxygen to allow for metabolic consumption by each diver plus that required to maintain the ppO2 during decompression (This quantity to be doubled for safety reasons)
  7. Gas reserves for the diver should be based on gas recovery systemnot operating
  8. Before a saturation dive there should be a minimum of 3 weeks supply of calibration & zero gas for analysers
  9. This reserve needs to be maintained during the saturation
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37
Q

Chamber Hygiene and bedding change should be perform how often?

A

Bedding changed every 3 days or twice per week.

General cleaning, pipework, walls, etc - every 3 days or twice per week

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38
Q

During a Saturation, you experience a rapid loss of chamber pressure. What are the consequences and what action the LST should perform?

A

Divers may suffer from decompression sickness, barotrauma and hypoxia as the PO2 drops

Major leak - considerable noise - communication difficult

Misting will occur as the temperature drops

Doors between chambers may seal

The divers should attempt to evacuate the leaking chamber and close the door

Diver’s should go on BIBS as the atmosphere maybe hypoxic or hyperoxic

They may need to evacuate to the bell or to a hyperbaric rescue vessel

Note: The LST should pressurise the system in an attempt to maintain pressure and other members of the surface should attempt to locate the leak

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39
Q

DMAC 028 recommends that every saturation system should provide a facility where an injured diver can be given medical treatment while under pressure. Designating one chamber.
What are the requirements of this chamber?

A

A minimum internal diameter of 1.8 metres (6 feet)but DMAC recommends 2.15m

The ability to remove or move out of the way, bunks and other equipment normally fitted to the chamber but not needed directly for a medical emergency

A bunk for the patient which should:

Be waist high

have access from at least one side and one end have a firm base

be able to tilt the patient to 30⁰ both at the foot and head ends

A working surface for medical instruments

A means for suspending IV drips overhead the patient

A convenient medical lock of at least 300mm diameter

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40
Q

During a saturation pressurization certain basics procedures should be followed, what are they?

A
  • The divers must be on BIBS for at least the first 10 msw (33 fsw)
  • The pressurisation must be stopped at about 1 msw (3 fsw) to check for leaks
  • Typical pressurisation rate is 2 meters per minute
  • Maximise circulation
  • Run ECU at full speed
  • Use emergency scrubber
  • Divers to wave towels around
  • Run any other internal fans
  • BIBS mixes breathable mix online
  • Follow pressurisation rates
  • Pressurisation rest periods may be required
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41
Q

What are the living parameters for a Environmental typical Heliox saturation?

A 
Humidity: 50% - 70%
PO2: 0.35 - 0.5bar
Temperature: 25 - 33 C
CO2: Less than 5mb (0.005ata)
N2: less than 1000mb (1ata)
Depth: 0.3m (1ft) of specified depth
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42
Q

In a split level saturation, what are the main concerns about it safety?

A

Leaks through the doors seals

Unbreathable atmosphere

Common lines

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43
Q

For how long a HES should be able to maintain pressure and support for the divers?

A

Maintaining the divers at the correct pressure and with life support for a minimum of 72 hours

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44
Q

What is the stand for HES, HRU, HRC, SPHL, LSP and HRF?

A

HRU: Hyperbaric Rescue Unit = is a general term for evacuation systems

HRC: Hyperbaric Rescue Chamber = is a floating chamber without a supporting crew

SPHL: Self Propelled Hyperbaric Lifeboat is a floating chamber with a support crew, usually contained in a conventional lifeboat

LSP Life Support Package

HRF: Hyperbaric Reception Facility is a chamber system located at a ‘safe location where the SPHL / HRC can be

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45
Q

Explain the 4 phases of Operational Emergency form launch divers to decompress?

A

Phase A:

Transfer of the divers into the HRU
Make it ready for launch
Maximum time to undertake this - 15 minutes

Phase B:

The launch of the HRU it to be 100m clear of the vessel/installation being evacuated
Maximum time to undertake this - 30 minutes
Time starts when the instruction to launch the HRU is given

Phase C:

The transit of the HRU to the reception site
Planning should be based on arrival at the safe haven within 75% of the HRU designed endurance
The safe haven is where the HRU arrives on completion of transit

Phase D:

Safe decompression of the divers

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46
Q

Who is the decision of decompress diver on HRU using LSP?

A

The decision to decompress the divers in the HRU using an LSP or providing a HRF medical treatment should be based on a full risk assessment involving the client

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47
Q

According to IMCA D014 rescue drills and HRU launch should be perfom?

A

Rescue drills - 14 days and Practice deployment every 6 months (IMO)

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48
Q

What are the minimum supervisory requirements for single bell operation, twin bell operation (with bottom turnaround) and Life support supervisors?

A

Single Bell: 2 supervisors per shift, if there is a trainee he should be in addition to it

Twin Bell: 3 supervisors per shift, one for each diving ops and a third one acting as relieve

LSS: at least 1 LSS and 1 LST per shift

PS: Divers from both bells are not permitted to work simultaneously

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49
Q

According to IMCA D002-10 the supervisor should be in control of the bell blowdown at all times, what are the main reasons?

a. contaminated bell atmosphere, supervisor enable to flush or vent
b. rapid internal pressure loss, enable to intervene.
c. divers became incapacitated
d. supervisor responsible for the course of the bell run

A

ABCD

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50
Q
  1. Through water comms must be tested?

a. at surface before bell launch
b. during the bell run
c. at working depth prior the diver lockout
d. at working depth post the diver lockout

A

C

Note: D022 states
‘‘Through water communications should be tested at the end of every dive, in preparation for the next dive, and recorded as a pre-dive check’’.

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51
Q
  1. If through water comms cannot be established diving operations should not proceed until the unit is operational again.

True or False?

A

True

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52
Q

According to IMCA D009 all quads should be fitted with their own permanent sling sets which should be correctly fitted to the designated attachment points on the frame.
What type of quads can you find offshore?

A

Type 1 (Vertical Quads) – The valves, fittings and pipework are all grouped together on the top face of the quad. Such quads typically contain 12 or 16 cylinders.

Type 2 (Horizontal Quads) – The valves, fittings and pipework are all grouped together on one end face of the quad. Such quads typically contain 45, 48 or 64 cylinders.

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53
Q

What ASOG stand for?

A

Acitivity Specific Operating Guidelines

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54
Q

About the chain hoist equipment, the stopper at the end of the chain should be capable of withstanding a load test of at least?

a. 2 times the maximum tension
b. 2.5 times the maximum tension
c. 150% of the WLL
d. 250% of the WLL

A

B

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55
Q

IMCA recommends that manufacture attachment points of lifting bags are designed with a MBF not less than…

a. 1.5 times
b. 2 times
c. 2.5 times
d. 3 times

A

A

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56
Q

What is the most common method to test equipment for oxygen cleaning?

A

Visual Inspection using UV light (3600 to 3900 angstrom)

Note: Tests are limited to determine the presence of contaminants, not the absence.

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57
Q

What is the most common method of approving materials for oxygen compatibility?

A

Bomb test

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58
Q

For how long is the medical examination pre-saturation valid?

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

A

C

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59
Q

One of the main items prohibited to take in Hyperbaric conditions is?

a) Battery Charges
b) Camera
c) Portable Computers
d) Toothbrush

A

A

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60
Q

The term “High Voltage” is used to refer to any voltage above?

a) 110V
b) 220V
c) 440V
d) 1000V

A

D

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61
Q

The term “ Low Voltage” is used to refer to any voltage below?

a) 24V
b) 50V
c) 110V
d) 220V

A

B

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62
Q

What is the maximum operating voltage of the system which safety can be assured for divers working in the vicinity of impressed current systems.

a. 30v
b. 50v
c. 110v
d. 24v

A

A

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63
Q

Flexible pipes carry out 25% or more of oxygen is limited to ….. of length.

a. 2 meters
b. 2.5 meters
c. 5 meters
d. 10 meters

A

C

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64
Q

Pressure of all Onboard gases (heliox and oxygen) must be reduced to a maximum of …… before entering the bell interior.

a. 6 bar plus ambient
b. 10 bar plus ambient
c. 30 bar over ambient
d. 40 bar maximum

A

C

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65
Q

What is the minimum diameter of a chamber manufactured after 1 January 2015 usef for hyperbaric evacuation system?

a. 1500mm or 60 inches
b. 1750mm or 69 inches
c. 1800mm or 72 inches
d. 2000mm or 80 inches

A

B

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66
Q

What is the recommended specification of “maximum detectable range” of a Helle Locator?

a. 200 meters
b. 300 meters
c. 400 meters
d. 500 meters

A

D

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67
Q

After decompression from 1,000 fsw to 400 fsw, the maximum downward excursion of a diver is 105 fsw. How long does the diver have to wait for a full upward excursion is permitted?

a. 12h
b. 24h
c. 48h
d. Diver has a free excursion.

A

C

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68
Q

According to HSE ACoP, how many diving supervisors can be appointed at any one time?

a. 1 supervisor
b. 2 supervisors
c. 2 supervisors and a trainee
d. 1 Superintendent

A

A

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69
Q

Following the BS EN 12021 - Breathing Gas Standards. What is the maximum allowed of Carbon Monoxide for Oxygen and Helium gas Mixtures?

a. 2 ppm
b. 3 ppm
c. 5 ppm
d. 0.2 ppm

A

D

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70
Q

Following the BS EN 12021 - Breathing Gas Standards. What is the maximum allowed of Carbon Monoxide for Nitrox mixtures?

a. 2 ppm
b. 3 ppm
c. 5 ppm
d. 0.2 ppm

A

B

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71
Q

A Certified David can be used as suspension point for cross hauling static line?

True or False

A

True

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72
Q

Bell tapping Code is to be located in a fixed position…

a. Only Outside of the Bell
b. Only Inside of the Bell
c. In the Diving Control Room
d. Outside and Inside of the Bell

A

D

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73
Q

Calibration of gases in the Dive Control and Saturation Control, should be done by the supervisor every…

a. 8 hours
b. 12 hours
c. 24 hours
d. Every Bell turn around

A

B

D022 - Analysers should be calibrated before every sat and every shift change thereafter or as indicated in company manuals.

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74
Q

The reasons of a Recovery system filters are to remove

a. Moisture and solid particles
b. Carbon Dioxide
c. Trace gases and bacteria
d. All of the above

A

D

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75
Q

Gas Recovery systems without a incorporate molecular filters can be used to pressurize the chamber.

True or False

A

False

Since the Chamber contains air before the pressurization, the recovery gas contain Nitrogen. If used there will be a increased nitrogen levels.

76
Q

Recovery systems with incorporate molecular filters can be set up to remove all gases, except:

a. Helium
b. Nitrogen
c. Oxygen
d. Argon

A

A

77
Q

About chambers water supply the Pressurised containers are normally supplied with what type of gas and what type of valve should be fitted in?

A

Normally with 2% or bottom mix via regulator piloted to the chamber pressure.

Non return valve to prevent accidental pressurisation of the water system.

78
Q

Solution of Tego 2001 containing 1% to 1.5% has the mix ratio with water by?

a. 100ml per 10 litres
b. 100ml per 20 litres
c. 100ml per 30 litres
d. 50/50% mix solution

A

A

79
Q

What is the last action of a bellman before lockout on a Bell emergency diver recovery?

a. Switch on OBG
b. Pull umbilical as tight as possible
c. Deploy the mazdam
d. Flood the trunking

A

D

80
Q

What is NORM stands for?

A

Naturally Ocurring Radioactive Material

81
Q

The Work Load Limit of a lifting bag is based in?

a. Saltwater
b. Freshwater
c. Depend where the job is taking place
d. 7:1 factor

A

B

82
Q

To avoid interference between the two brake systems, they must be tested separately. The hydraulic primary brake must be tested ………….. and the secondary brake tested ……………

A

Dynamically

Statically

83
Q

Silica Gel as the drying agent as it absorbs?

a. CO2
b. O2
c. Helium
d. Nitrogen

A

b. O2

84
Q

What drying agent is used to absorb CO2?

a. Silica Gel
b. Soda lime
c. Potassium Permanganate.
d. None of the above

A

c. Potassium Permanganate.

85
Q

If the hotwater of the diver drops below the pre set limits. There must to be.

a. An audio alarm
b. Diver will tell the supervisor about the situation
c. Visual Alarm
d. Audio and visual alarm at the dive control.

A

d

86
Q

What is the minimum length of umbilical for connection on the HRU?

A

50 meters

87
Q

What is the correct order of the ingredientes of filter?

A

Bottom: Soda sorb
Middle: Charcoal
Top: Purafil

88
Q

After surfacing from a icy-Helium saturation dive symptoms of decompression illness tend to appear within…

a. 2 hours
b. 4 hours
c. 6 hours
d. 8 hours

A

C

According to DMAC22.

89
Q

A minimum diameter of chamber for medical treatment to be carried out in saturation systems is?

a. 1.8m
b. 2m
c. 2.5m
d. 3m

A

A

According to DMAC28

90
Q

Deep saturation dives in excess of 200 metres, the surface interval should not be less than the duration of the dives, preferably 28 days.

True or false

A

True

DMAC21

91
Q

Contractors my need to use pure Helium offshore as…

a. Not allowed
b. For very deep dives
c. Calibration gas only
d. Allowable if agreed between client and contractor

A

C

DMAC05

92
Q

After a saturation completed, the diver should remain close to a chamber for at least?

a. 4h
b. 8h
c. 12h
d. 24h

A

C

93
Q

Depending o the diving operation there are different types of sampling tubes. What types are they?

A
  • carbon dioxide,
  • carbon monoxide,
  • hydrogen sulphide,
  • benzene
  • hydrocarbons.
94
Q

During a saturation operation, How Often DP alarms must be tested with dive control?

A

If diving is being carried out from a vessel operating on DP, then an audible and visible alarm activated by the DP operator must be fitted in dive control to inform the supervisor of the DP status.
It must be tested before each dive when operating on DP

States on D022 and D024

95
Q

Hot water alarms must to be fitted in the dive control showing…

A

audible and visible alarm which indicates if the water temperature moves outside the pre-set limits.

96
Q

Oxygen HP cylinder is acceptable inside of the bell?

A

No!

HP oxygen must not be available inside the bell.

97
Q

Safety meeting logged by the diving superintendent, should be logged by?

A

minutes

98
Q

Who should be in control of ensuring a suitable permit to work system between the diving team and installation manager?

A

Client

99
Q

Who is responsible for the health and safety of the dive team?

A

Diving supervisor

100
Q

Who is responsible to checking and maintain the HLB?

A

LSS

101
Q

State responsibilities of LST?

A

● carrying out chamber checks;
● carrying out pressurization and decompressions;
● supervising medical and equipment lock operations;
● assisting during TUP;
● maintaining the chamber environment within the limits specified by the company;
● calibrating analysis instruments;
● gas mixing;
● reporting any equipment faults, other potential hazards, near misses or accidents;
● assisting during any emergency procedures;

102
Q

How Divers in a chamber avoid suction injury from exhaust valves?

A

This hazard is normally avoided by fitting T-pieces or sections of drilled pipe to the valves.

103
Q

If Air is used as a scale gas on oxygen analysers, the scale should be set at?? the sample should be taken from?

A

20.9%.

From outside

104
Q

Diver gas recovery systems filter remove what?

A
  • moisture,
  • solid particles,
  • carbon dioxide,
  • trace gases
  • bacteria.
105
Q

During decompression, gas is normally exhausted to the atmosphere at depths less than ??

A

about 20 msw (66 fsw).

106
Q

Should the gas board be updated at least ?

A

once per shift

107
Q

Who is responsible for the divers during the course of the bell run?

A

Diving supervisor

108
Q

What you should take in consideration when sizing the bailout bottle?

A

Diameter of the mainway of the bell

109
Q

Both hyperthermia and hypothermia are gradual in onset and will not be noticed by the diver. How does the supervisor notice the sign?

A

Symptoms of fatigue or confusion, or changes in breathing pattern.

110
Q

The diver’s bail-out is not the secondary supply. In a wet bell it is acceptable that the secondary supply is provided from the onboard cylinders, provided that there is either one diver remaining in the wet bell to switch the supplies over manually or else that the switchover is automatic.

True or False

A

True

111
Q

In a wet bell ops the diving supervisor lost communication with the bell man. How can he establish a communication procedure?

A

Typically, the diving supervisor will signal the bell by flashing the bell lights and the divers will signal by operating the blow-down valve.

112
Q

How can a lost bell be located?

A

A lost bell can be located using a locator deployed from a surface vessel, a diver hand-held locator or a locator mounted in an ROV.

113
Q

The right process to test the through water communication system?

A

Through water communications should be tested at the end of every dive, in preparation for the next dive, and recorded as a pre-dive check. At depth!

D008 states:
‘‘On each dive a function check should be carried out prior to diver lock out at the working depth. If communication is not established diving operations should not proceed the unit is operational again.’’

114
Q

During the actual transfer the chamber system should be safeguarded by having a diver in the transfer lock controlling the trunking door and by ensuring that all doors to the transfer lock remain closed.

True or False

A

True

115
Q

Whose responsibility is keeping the diving supervisor informed of any changes that may affect the diving operation?

A

Client

116
Q

Is this correct to say?

Divers who have suffered an incident of decompression illness will need to record details of the treatment they received in their logbooks. They will need to show this to the supervisor responsible for the first dive after the treatment in order that a check can be made of their fitness to return to diving.

A

Yes

117
Q

Before any dive not involving saturation, the supervisor will need to ask the divers to confirm that they are fit to dive and will record this in the diving records.

True or False

A

True

118
Q

During a diving operation where the medical equipment should be held in a vessel?

A

Medical equipment should be held in the diving bell, chambers and hyperbaric rescue facility. In addition, specialised medical equipment needs to be held at the dive site.

119
Q

One of the main goals of a detailed risk assessment is?

A

The assessment should ensure that a failure of a single component should not lead to a dangerous situation.

120
Q

Is it mandatory for the offshore installation manager to have a background in diving and ROV operation?

A

The offshore manager will normally be the primary contact point offshore with the client, may or may not have a diving background.

121
Q

How many warning instructions signs must be in a HRU?

A

The warning instructions will normally be shown in at least two separate locations.

122
Q

How many marking signs must be shown on HRS?

A

Each system should be marked with three identical signs, as shown below. One should be on the top of the system, mounted horizontally, and the other two on opposite sides mounted as near vertical as possible.

123
Q

It is not acceptable to plan from the outset of a project to use a diving bell as a hyperbaric rescue unit.

True or False

A

True

124
Q

The purpose of the bell external bottom door is to __________?

a. Serve as an alternative to the inner door
b. Provide a positive mean of avoiding external pressure acting on the inner door
c. Serve no purpose other than aesthetics
d. Sese as a step ladder to assist diver entry into the bell

A

B

125
Q

Current IMCA guidance covers the need for bell doors to be in place which are capable of providing a pressure seal against both internal and external pressure. Where can this guidance be found

a. IMCA D018
b. IMCA D024
c. IMCA D014
d. IMCA D032

A

A

126
Q

The bell’s external door should always be kept closed during

a. The bell’s decent to working dept
b. Bell transfer to a different depth
c. Cross hauling operation
d. All of the above

A

D

127
Q

The decision to use or not use a bell outer door should alwaysdepend on _______.

a. The unanimous vote of the divers
b. The result of a vessel and site-specific robust risk assessment
c. The advice of the Diving SME
d. lts potential to cause umbilical fouling or impede diver recovery in an emergency

A

B

128
Q

When carrying out a ‘use or do not use bell external door ‘ risk assessment the mitigating measures provided should consider.(Check the applicable answers)

a. Height of deployment (air gap) with engineering calculation ofexternal force acting on the internal door if bell is dropped from height to water surface
b. Deployment technique to achieve planned depth
c. Thickness of the external door
d. All of the above

A

A, B

129
Q

Which of the following lists the correct Hierarchy of Controls frommost elective to least effective

a. Elimination, Substitution, Administrative Controls. PPE.Engineering Controls

b. PPE, Administrative Controls, Engineering Controls, Elimination,Substitution

c. Elimination, Substitution, Engineering Controls, AdministrativeControl, PPE

d. Administrative Controls, Engineering Controls PPE, Substitution, Elimination

A

C

130
Q

When the bell is provided with a fully operational castellated bottom door the external bottom door would become redundant and couldpossibly be removed.

a. True
b. False
c. Subject to risk assessment and management of change approval
d. Subject to the job scope

A

C

131
Q

When opening a battery housing one should? (Check applicable answers)

a. Not do so in a confined space
b. Always have a Fire Watch on standby
c. Consider purging the housing with air
d. Always wear eye and respiratory protection

A

A C D

132
Q

Why is it recommended that batteries be housed outside of thebell? (Check applicable answers)

a. So as to keep the bell balanced
b. To avoid heliox seepage into the battery and housing andconsequent pressure build up
c. Batteries carry the risk of an explosion and fire
d. Makes the task of replacing the batteries much easier

A

B C

133
Q

The battery compartment of the SPHL should always

A. be equipped with means to keep it well ventilated

B. Large enough to fit twice the needed capacity

C. Be situated within the chamber

D. Be painted with bold contrasting colours

A

A

134
Q

Which of these statements are true about the charging batteries (check all correct answers)

a. It must be assumed that regardless type or charging arrangementa charging battery will give off noxious flammable gas

b. Charging of batteries should be done only in an open and well ventilated space

c. The use of warning signs to draw attention to the danger ofexplosion during battery charging should be considered

d. A safe procedure must be adopted for the charging of diving system batteries

A

A B C D

135
Q

Bell external battery housing should ? (Check applicable answers)

a. Be fitted with a pressure relief device
b. Be waterproof
c. Be colour coded
d. Be pressure proof

A

A B D

136
Q

Which of these is not an IMCA D024 requirement for External BatteryPack?

a. Visual examination and function test in the last 6 months
b. Shunt diode protection should be provided
c. Battery terminals and leads must be Insulated to protect againstshort circuit
d. Periodic examination and testing of the cells by a competent person should form part of the PMS

A

A

137
Q

When employing a bell external battery pack? (Check applicable answers)

a. Batteries should always be used in accordance With manufacturers’ recommendations.

b. Batteries should be charged in line with the guidance given inIMCA D 055 - Prevention of explosions during battery charging inrelation to diving systems.

c. Lead acid batteries should not be used in a hyperbaric environment.

d. The battery casing should not be opened in a confined space andshould be fully vented.

A

A B C D

138
Q

Battery charging on board an SPHL can occur only after these considerations. (Check applicable answers)

a. Installation of a gas analyser to monitor the lifeboat atmosphere.

b. Batteries should be located outside the SPHL or physically isolated from the atmosphere inside the lifeboat by a water tightcompartment.

c. Approval from all the occupants of the SPHL.

d. Appropriate ventilation arrangements for the battery compartment should be made.

A

A B D

139
Q

Who is responsible for control of all TUP operation?

a. Dive Superintendent
b. Life Support Supervisor
c. On shift Life Support Technician
d. On shift Dive Supervisor

A

D

140
Q

During TUP of divers into the bell you are losing depth at a constantrate. What is your immediate course of action?

a. Instruct tenders to check for leaks
b. Maintain depth and transfer divers to a safe place
c. Inform the Dive Superintendent
d. Maintain depth and ignore the leak as it is within acceptable limits

A

B

141
Q

All members of the diving team should NEVER attempt to removethe trunking clamp without? (Check applicable answers)

a. The expressed instructions from the on-shift diving supervisor
b. Tapping the trunking to ensure there are no occupants
c. Ensuring the pressure gauge on the trunking is reading zero
d. Opening the bleed valve on the trunking to ensure there is no pressure in the trunking

A

A C D

142
Q

IMCA D014 Rev.2.1 mandates that all diving bell trunks should? (Check applicable answers)

a. Be equipped with pressure indicators/gauges

b. Locking clamps be equipped with pressure interlocks to ensure that they cannot be released while under pressure

c. Pressure indicator/gauges and pressure/vent lines should have their own penetrators to avoid single point failure in case ofblockage

d. Have an inner diameter of minimum 800 mm

A

A B C

143
Q

When are TUP operations in progress? (Check applicable answers)

a. As a safeguard have a diver in the transfer lock controlling thetrunking door and ensuring that all doors to the transfer lock remainclosed.

b. Communications between Dive Control, Saturation Control andDeck are to be kept open at alt times

c. All chamber bell and trunking depths MUST be monitored at alltimes

d. All steps the LSS, LST, Dive Tenders take cannot proceed withoutthe approval of the Dive Supervisor

A

A B C D

144
Q

All manway doors within the saturation complex should? (Checkapplicable answers)

a. Be kept open always to facilitate quick evacuation of divers toHRC in case of emergency

b. Be kept closed at all times unless diver/s are leaving or enteringthe lock/chamber

c. Have their status checked regularly by the Dive Supervisor andthe Life Support Supervisor

d. Be kept open or closed at the discretion of the divers

A

B C

145
Q

During a bell lock on operation your LST reports a steady loss of depth in the trunking. What is your immediate action?

a. Maintain pressurization of the trunking at rate of loss and proceed with TUP procedure
b. Instruct dive tenders to check for leaks
c. Vent the trunking to surface, decouple the bell from the trunking. Inspect the bell mating flange faces and O-ring seals
d. Vent the trunking to surface, follow company procedure

A

D

146
Q
  1. A safe TUP operation is dependent on? (Check applicable answers)

a. Strict adherence to company TUP procedures

b. Good communication between all personnel involved

c. Competence of the diving supervisor

d. Diligence and discipline of the entire diving crew

A

A B C D

147
Q

A step by step system specific plasticised TUP procedure MUST be posted? (Check applicable answers)

a. Saturation Control

b. Bridge

c. Dive Control

d. TUP chamber

A

A C

148
Q

A TUP Procedure needs to be? (Check applicable answers)

a. viewed and approved in line with the company standard

b. Only the most current revision to be used

c. System specific

d. Clearly define the roles and responsibilities of all involvedpersonnel at each step of the procedure.

A

A B C D

149
Q

As the diving supervisor you have to ensure the proper functioningof the Hyper-gas bell unit during a bell run by asking the bell occupants for the following: (Check all applicable answers)

a. LCD reading
b. Drain gas outlet water trap
c. Details of which LED lights are on
d. Flow meter reading

A

A C D

150
Q

The Hyper-gas topside repeater alarm sounds during a bell run. What would be your immediate action?

a. Instruct the bellman to flush the bell
b. Record the time of the alarm in the dive logbook
c. Confirm with the bell occupants if te bell unit alarm is activatedtoo
d. Instruct all bell occupants to go on BA Immediately

A

D

151
Q

We can greatly reduce the risk of bell atmosphere contamination byemploying enhanced diving procedures such as? (Check applicable answers)

a. Correct subsea positioning of the bell i.e. offset and up-stream ofcontaminated worksite

b. Complete decontamination of divers before entry into the bell

c. Deploying ROV to survey the worksite for possible contaminants

d. Using umbilical shrouds to protect the first 40 metres of umbilical from contact with contaminants

A

A B C D

152
Q

The primary defence against contamination of bell atmosphere should be? (Check applicable answers)

a. To ensure volatile compounds do not enter the diving bell

b. Monitor the bell atmosphere frequently with gas sampling tubes

c. Adopt enhanced diving procedures when diving in potentially contaminated water

d. Establish a bell contamination emergency response procedure

A

A C

153
Q

When diving in potentially contaminated water? (Check applicable answers)

a. All efforts should be made at the planning stage to identify andrisk assess any hazardous substances and contaminants that may be encountered at the dive site and/or system or installation to be

b. Flush the bell continuously with the bottom door in the openposition to maintain a positive pressure in the bell

c. Enhanced diving procedures should be employed to prevent or minimise the risk of contaminants being introduced in the bell by returning divers

d. Consideration should be given to providing a means of monitoringthe bell atmosphere for hydrocarbons and H2S

A

A C D

154
Q

Your divers are returning to the bell after 2 hours lockout working toinstall a plidco clamp on a Leaking pipeline carrying crude. Whatactions should you take? (Check all applicable answers)

a. Instruct the bellman to go on BA for diver recovery

b. Instruct divers to scrub umbilical in water before bellman recoverdiver stack especially the last 5 metres length from the diver

c. Instruct diver to remove protective over-suit and it necessaryboots and gloves prior to entering the bell

d. Monitor hyper-gas analyser for safe reading and diver may removehis diving helmet only when its deemed safe to do so.

A

A B C D

155
Q

The bell atmosphere may become contaminated with potentiallyanaesthetic vapours primarily via? (Check applicable answers)

a. Turbid water column

b. Gaseous ingress into the bell via the open bottom door

c. Malfunction of CO2 scrubber

d. ‘Gassing-Off:” of solid or liquid contaminants inadvertentlyintroduced into the bell by retuning diver/s

A

BD

156
Q
  1. In closed bell diving operations, on top of other gas reserves, there should be sufficient gas available in reserve to allow each diver how many hours of breathing on BIBS masks at the deepest storage depth?

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

  1. In Question 1 if the gas supplies fall to a level such that the remaining gas quantity does not meet this requirement ?

a. Decompression should be started immediately
b. The Diving Superintendent has to be informed immediately
c. A risk assessment needs to be performed to assess the feasibilityof continued operation
d. It is no cause for concern as this deficiency can be covered by other reserves such as pressurization gas reserve

In Question 1, what is the total volume of gas required in reserve for 6 divers at storage depth of 60 msw?

a. 28.8 m3
b. 33.6 m3
c. 172.8 m3
d. 201.6 m3

A
  1. D
  2. A
  3. D
157
Q

The objectives of guidance document IMCA D 050 Rev.1 includes? (check the appropriate answers)

a. Ensure that the amounts of emergency air and gas held at the site have been carefully considered and calculated

b. Ensure that supervisors do not start a dive and that they cease diving or commence decompression in saturation operation if theseamounts are reduced to below the identified minimum level

c. Assist the diving contractor in preparing the diving project plan.

d. Ensure that these amounts are displayed in dive control and insaturation/chamber control.

A

A B C D

158
Q

Before commencement of saturation diving, certain quantities of gas must be made available. (check the appropriate answers)

a. There should be sufficient oxygen to allow metabolic consumptionby each diver, any oxygen make-up prior to decompression, plusthat is required to maintain the PPO2 during decompression. Thisquantity should be doubled for safety reasons and held in twoseparate banks.

b. There should be a minimum of two weeks’ supply of calibrationand zero gas for the analysers. This reserve needs to be maintainedduring the saturation .

c. Sufficient mixed gas available to be able to pressurise the systemto the maximum intended storage depth, plus at least an equalamount as a reserve. This reserve must be maintained at all timesduring the operation.

d. Sufficient mixed gas should always be available at the start of abell-run to carry out the intended bell-run or for both intended bellruns if conducting bottom turn-around/continuous diving, plus thesame quantity should be held in reserve.

A

A C D

159
Q

What is the total metabolic O2 consumption for 6 divers for a day at a storage depth of 70msw?

a. 34.56 m3
b. 30.24 m3
c. 2160 litres
d. 4320 litres

A

D

160
Q

A Hyperbaric Reception Facility (HRF) with a floodable volume of 23 m3 is envisaged to mate with a Hyperbaric Rescue Unit. The project storage depth is 45 msw. What is the minimum quantity of pressurization gas that should be made available to the HRF according to IMCA D 050 Rev. 1,

a. 103.5 m3
b. 253 m3
c. 207 m3
d. 126.5 m3

A

C

161
Q

Which of these statements regarding minimum gas quantities required for life Support Package is true? (check the appropriate answers)

a. The minimum gas requirements for LSP is dependent on itsobjective. i.e. primary support for HRU decompression or interimsupport of HRU in transit to HRF.

b. The provision of therapeutic mix a as part of the LSP minimumgas requirement is optional

c. The exact minimum gas quantities are driven by HRU volume,depth, manning and location.

d. In circumstances where it may not be practical or possible for theLSP to contain all of the required gas, then the planning shouldinclude details of nearby locations which could supply additionalgas and consumables, details of the transport arrangements tomove these to the LSP and the likely timescale.

A

A C D

162
Q

The Hyperbaric Rescue Unit (HRU) should be capable of sustaining the divers at the correct pressure and with life support for a minimum of _______ hours.

a 24
b. 48
c. 72
d. 96

A

C

163
Q

What is the recommended maximum time duration to evacuate a saturation system, transferring all its occupants in to the hyperbaric evacuation unit (HRU) and making it ready for launch?

a. 20 minutes
b. 30 minutes
c. 15 minutes
d. 10 minutes

A

C

164
Q

Which of these statements regarding the Hyperbaric Evacuation Plan (HEP) is true? (select the appropriate answers)

a. Each project that involves saturation diving operations needs to include hyperbaric evacuation planning in the project preparations.

b. The HEP outlines in writing the method for the pressurisation, transfer to, launching, transit and recovery/reception of the Hyperbaric Rescue Unit (HRU).

c. The HEP assists operational staff with understanding their roles and responsibilities.

d. The HEP should be based on the worst case scenario of evacuation from a diving vessel or facility with lts full complement of diving bell(s) deployed and requiring recovery and evacuation of all saturation divers.

A

A C D

165
Q

Periodic hyperbaric evacuation drills are necessary to? (setect the appropriate answers)

a. Break the dreariness of routine operations.
b. Test the operational efficiency of the hyperbaric evacuation system.
c. Identify possible gaps and deficiencies in the hyperbaric evacuation procedure.
d. Test the response, skill knowledge and readiness of personnel.

A

B C D

166
Q

Link the following points to their respective phases of the hyperbaric evacuation process:

a. HRU launch - Phase A, Commence decompression - Phase B,Tansfer of divers into HRU - Phase C, Transit to HRF - Phase D,

b. Transfer of divers into HRU - Phase A, HRU launch - Phase B, Transit to HRF - Phase C, Commence decompression - Phase D

c. Transit to HRF - Phase A, HRU launch - Phase B, Commence decompression - Phase C. Transfer of divers into HRU - Phase D

d. Commence decompression - Phase A. Transit to HRF - Phase B, Transfer of divers into HRU - Phase C, HRU launch - Phase D

A

B

167
Q

Hyperbaric rescue units (HRU) should be marked with _____ identical signs. Att of which should be visible when the rescue system is boating in water.

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

A

C

168
Q

The hyperbaric evacuation plan (HEP) should contain details relating to? (select the appropriate answers)

a. Personnel manning levels and their required training and competency.

b. Procedure for the launch, support, recovery of chamber occupants and support crew of the hyperbaric evacuation system (HES).

c. The recovery to, and transfer into, a dedicated Hyperbaric Reception Facility (HRF). either fixed or portable, for final controlled decompression.

d. A list of all safety critical elements that are classified as single point failures and the mitigation provided.

A

A B C D

169
Q

A hyperbaric evacuation and recovery operation is considered complete when?

a. All divers have completed the required decompression, any therapeutic treatment and bend watch and are safely back at atmospheric pressure.
b. All divers are transferred out of the saturation system into the HRU.
c. The HRU is launched and is at least 100m clear of the vessel/installation being evacuated
d. The HRU arrives at its designated safe haven site or hyperbaric reception facility.

A

A

170
Q

What is the maximum rate of depth change during an excursion? (select the appropriate answers)

a. 18 msw per minute
b. 30 fsw per minute
c. 60 msw per minute
d. 60 fsw per minute

A

A D

171
Q

A lock-out is planned from a storage depth of 270 fsw. The diver will be working at the maximum upward excursion depth allowed, followed by a descending work scope that will eventually take the diver to the maximum downward excursion depth. Could the same 02 percentage be used in the diver’s bailout to remain within the DMAC 04 Rev2 PP02 Limit for the whole dive? (Assume a Lock-out ppo2 of 0.7 bar) Which of the following options below is the correct answer?

a. Upward - 186 fsw with a PPO2 of 0.75 bar and Downward - 358fsw with a PPO2 of 1.30 bar and a Bailout percentage of 12%
b. Upward - 186 fsw with a PPO2 of 0.75 bar and Downward - 358fsw with a PPO2 of 1.30 bar and a Bailout percentage of 11%
c. Upward: 194 fsw with a PPO2 of 0.82 bar and Downward - 358fsw with a PPO2 of 1.42 bar and a Bailout percentage of 12%

d. Upward - 194 fsw with a PPO2 of 0.76 bar and Downward - 358fsw with a PPO2 of 1.30 bar and a Bailout percentage of 11%

A

D

172
Q

If the Storage Depth is 190 fsw what would be the maximum downward excursion distance allowed, and the deepest attainable depths? (use Table 13-7 Unlimited Duration Downward Excursion Limits and Table 13-8 Unlimited Duration Upward Excursion Limits)

a. 73 fsw / 253 fsw
b. 75 fsw / 265 fsw
c. 63 fsw / 127 fsw
d. 77 fsw / 277 fsw

A

B

173
Q

The diving superintendent orders the decompression of one team currently stored at 430fsw to a new storage depth of 300 fsw to perform a task at 280 fsw. Which of the following statements is true?

A. The decompression to 300 fsw can completed with the divers locking out to 280fsw on arrival

B. The decompression can commence but you advise the Diving superintendent that they will have to decompress all the way to 280fsw as you cannot perform an upward excursio from a new storage depth for 72h after arrival

C. The decompression cannot commence immediately due to the minimum hold period not being completed since the teams last downward excursion.

D. The decompression cannot commence until he company minimum hold period is completed, and the team will have to decompress all the way to 280 fsw as you cannot perform an upward excursion from a new storage depth for 48 hours after arrival.

A

D

174
Q

During the drafting of a dive plan, an engineer has planned a diver lock out from a storage depth of 430 fsw with an upward excursion to 380fsw for a light inspection work scope. As the diving supervisor which of the following would you determine to be correct? (select the appropriate answers)

a. The excursion can be carried out as it is within the upward excursion limit set out in Table 13-8 (Unlimited Duration Upward Excursion Limits).

b. The dive can proceed as the team’s last performed dive was to 480fsw 29 hours previously.

c. The dive cannot proceed as the team performed a dive to 500fsw 29 hours previously.

d. The Dive can proceed as the team performed a dive to 530 fsw 49 hours previously.

A

A B C D

175
Q

If your company has a percentage limit in the allowable excursion set against the total allowable excursion limit in their diving tables, then what would be your company’s maximum downward excursion and deepest attainable depth for a storage depth of 370 fsw, if there was a 50% limit?

a. 101 fsw / 471 fsw
b. 50 fsw / 420 fsw
c. 45 fsw / 415 fsw
d. 51 fsw / 421 fsw

A

B

176
Q

At a storage depth of 400 fsw, during which dives were made to 495 fsw, What is the maximum upward excursion that may be made? (select the appropriate answers)

a. If less than 48 hours have elapsed since the 495 fsw excursion, Table 13-8 allows a maximum upward excursion of 104 fsw from the deepest depth of 500 fsw to a depth of 396 fsw.

b. If less than 48 hours have elapsed since the 495 fsw excursion, Table 13-8 allows a maximum upward excursion of 103 fsw from the deepest depth of 490 fsw to a depth of 387 fsw.

c. If more than 48 hours have elapsed since the excursion, the maximum upward excursion allowed is 104 fsw from 500 fsw to 396 fsw.

d. If more than 48 hours have elapsed since the excursion, the maximum upward excursion allowed is 93 fsw from 400 fsw to 307 fsw.

A

A D

177
Q

The divers were compressed to 600fsw from the surface. According to Table 13-7 (Unlimited Duration Downward Excursion Limits), the maximum downward excursion for an unlimited period not requiring decompression is ……? Just now the diver descends to 650fsw. Thus, for the next 48 hours, these divers may move freely between the depths of ……. and ……… white at a storage depth or 600fsw.

a. 727 fsw, 485 fsw and 727 fsw

b. 127 fsw, 531 fsw and 650 fsw

c. 727 fsw, 531 fsw and 650 fsw

d. 127 fsw, 531 fsw and 727 fsw

A

B

178
Q

What should be considered when deciding on the length of a closed diving bell umbilical?

A
  • The distance of the job from the proposed closed bell location;
  • The duration of the diver’s bail out bottle at the depth.
  • The diameter of the bell manway must be considered when sizing the bail out bottle, as this will dictate the diver’s ease of entry into the bell;
  • The size of the closed bell in relation to the storage of the diver’s and bellman’s umbilicals;
  • The type of umbilical, its bulk and buoyancy.
179
Q

Describe adiabatic compression by O2 line

A

It is when a oxygen with a High pressure is release into a low pressure system.
It can be avoided, for example by reducing the oxygen pressure at source, by installing a pressure controller directly on the outlet valve of the oxygen bank and/or use of needle valves instead of quarter-turn valves on all oxygen circuits.

180
Q

The load chain should be fitted with a stop at the free end. How much weight the stopper should be able to hold?

A

The stop should be capable of withstanding a load of at least 2.5 times the maximum tension in the load chain at the full design working load limit

181
Q

In case of divers working in contaminated water, where do they should be positioned?

A

Divers will be positioned downstream, and any show of bubbles must be reported to the Dive Supervisor Immediately.

182
Q

In relation diving in contaminated waters the Vessel and Diving Bell position should be optimised. lf possible offset and ___________ of potential contaminated worksite.

A

Upstream

183
Q

About concrete matress procedures, Throughout the over-boarding and deployment operations, from initially hooking up the mattress through to landing the installation frame back on deck, instant uninterruptible communication needs to be available between??

A 
● divers;
● dive control; 
● ROV control; 
● crane  operator; 
● deck leader; 
● bridge.
184
Q

Recover of concrete mattress is feaseble by frame or beam.

True or False

A

True.

But with a careful investigation and risk assessment.

185
Q

Between Bridge and Dive Control There should be both primary and secondary means of communication. if the vessel is in DP, the primary link must be?

A

Hard wired and dedicated.

Note: Both (Primary and Secondary) of which should be continuously available; and one should operate without the need for external power supply.

186
Q

On a designated dive support vessel where the DP status lights should be displayed?

A

In dive control rooms

Often also displayed in saturation control, on deck and in the ROV control room.

187
Q

Who is responsible to carry up to date diving operations log in a project?

A

The diving superintendent or supervisor is normally responsible for a variety of reports, which may include:
● daily report;
● near miss, incident and accident reports;
● key performance indicators that have been agreed as project benchmarks;
● medical log;
● shipping records and shipping returns;
● equipment failures and damage reports;
● monthly summary of emergency drills and exercises;
● gas quantities reports/status;
● minutes of safety meetings.

The diving superintendent or supervisor may delegate the completion of parts of the report to other team members, although he carries the final responsibility.

Bell Diving Supervisors QUESTIONS (15 decks)

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