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Bell Diving Supervisors QUESTIONS > Equipment tests and tools > Flashcards

Equipment tests and tools Flashcards

1
Q

What is the safety factor for Wire Rope and Slings?

a) 4:1
b) 5:1
c) 7:1
d) 8:1

A

b) 5:1

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2
Q

What is the safety factor for wire ropes used for man riding?

a) 4:1
b) 5:1
c) 7:1
d) 8:1

A

d) 8:1

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3
Q

Multi-legged slings should ideally be used with the legs at less than…… never with legs more than…..

a) 120 and 90
b) 80 and 100
c) 90 and 120
d) 90 and 180

A

c) 90 and 120

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4
Q

IMCA recomends the use of HPWJ for cleaning SA 2 1/2, at what pressure?

A

210 - 500 bar (4000 - 8000psi)

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5
Q

What is the minimum length of hose required per jetting gun unit?

A

1.5 times the maximum anticipated working depth.

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6
Q

What is the minimum lance lenght of water jet gun?

a) 60cm
b) 80cm
c) 90cm
d) 1m

A

a) 60cm

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7
Q

What is the tipically safe voltage used for electrical power tools on deck?

a) 24V
b) 110V
c) 220V
d) 440v

A

b) 110V

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8
Q

The maximum voltage a diver could be exposed to underwater with ELBs or RCDs?

A

110v

Always prefer DC than AC

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9
Q

The maximum voltage a diver could be exposed to underwater without ELBs or RCDs?

A

Is 24V

Always prefer DC than AC

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10
Q

The Negative terminal of a welding cable is conected to:

a) workpiece
b) knife switch
c) torch
d) neutro

A

c) torch

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11
Q

The positive terminal of a welding cable is conected to:

a) workpiece
b) knife switch
c) torch
d) neutro

A

a) workpiece

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12
Q

Cold cutting discs shoud always be discarded after used in the water.

True ar false

A

True

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13
Q

What are the 4 types of cutting methods ?

A
  1. Mechanical
  2. Explosive
  3. Eletrochemical
  4. Thermal
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14
Q

What is the use of a flash arrestor in the oxy cutting torch?

A

Is a safety device to stop the flame or reverse flow of a gas back up into equipment or supply line.
Protects the user and the equipment from damage or explosions.

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15
Q

What are the main safety features should be incorporated on oxy arc burning equipment?

A

A flashback arrestor and Monel screen in combination with a pressure relief valve

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16
Q

Whats the difference between a inverter line and hold back line on lifting bags operations?

A

The inverter line is in place to invert and spill the gas from the bag if there is a failure on any part of the rigging between the bag and the load and the bag breaks free and starts an uncontrolled ascent

The hold-back line is provided to restrain or hold-back the positive buoyancy of the lift bag. It should be attached in such a way as to prevent an uncontrolled ascent of the load being lifted.

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17
Q

All underwater air lift bags (including small bags up to 50 kg WLL) should be fitted with a suitable manufactured attachment point for an inverter line.

True or False

A

True

From 1 of january of 2018

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18
Q

What is the minimum factor of safety for an underwater air lift bag and the each webbing slings on its working load limit?

A

air lift bags is 5:1

each webbing slings is 7:1

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19
Q
  1. IMCA D018 recommends the annual bell winch static test of each brake system should be to what multiple of working load?

(a) 1.1
(b) 1.5
(c) 8:1
(d) 1.25

A

d

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20
Q
  1. The braking mechanism of a bell winch must have?

(a) A back up air motor system
(b) Two independent braking systems
(c) A back up accumulator
(d) A foot pedal operating switch (“Deadmans” pedal)

A

b

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21
Q
  1. The lowering system for diving bells should be controlled by?

(a) The drive system of the winch
(b) An Air Motor
(c) The secondary brake tension spring
(d) A pawl or ratchet mechanism

A

a

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22
Q
  1. If the energy supplying the handling system fails, brakes should be applied?

(a) Automatically
(b) By “deadmans pedal”
(c) By winch driver
(d) By back-up power

A

a

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23
Q
  1. Bell handling systems should provide?

(a) Mating to/from chamber within 30 minutes in all weather conditions
(b) Mating under stormy weather conditions
(c) Easy and firm mating to/from chamber in all weather conditions
(d) Mating providing vessel is not listing

A

c

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24
Q
  1. When powered systems for bell mating fail:-

(a) A back up electrical supply should be available
(b) A contingency plan must be prepared
(c) Decompression in the bell must be possible
(d) Auxiliary power or appropriate means should be provided

A

d

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25
Q
  1. When a bell cross-haul wire can be used for secondary recovery, the wire must be?

(a) 1.5 times S.W.L. of main wire
(b) Sufficient strength to lift bell to interface man riding 8:1
(c) Sufficient strength to lift bell onto deck
(d) 6.5 times S.W.L. of main wire

A

b

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26
Q
  1. According to IMCA D 018 lifting plant forming part of the diving equipment used for man-riding must have an independent static load test on each brake system at 1.25 times the SWL, every how often?

(a) Every 6 months
(b) Every year
(c) Every 3 years
(d) Every 5 years

A

b

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27
Q
  1. According to IMCA D 018, when in service, lifting appliances & equipment used for man-riding must have a dynamic test of launch and recovery on each brake system at 1.25 times the maximum SWL, every how often?

(a) 6 months
(b) 2.5 years
(c) 5 years
(d) 12 months

A

d

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28
Q
  1. A bell main wire should have a safety factor breaking strain of?

(a) 5:1
(b) 6:1
(c) 7:1
(d) 8:1

A

d

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29
Q

Gas Reclaim System, Gas Mixer and Gas Blenders should have Visual examination and function test (including any safety devices other than PRVs) every…

A

6 months

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30
Q

Bell Ballast Release Systems should be tested…

A

6 months: Visual examination and function test of all mechanisms

12 months: Overload test to 1.5 times the static load of the ballast weight in the air. NDE carried out on all critical items

12 months: Dry function test of all components and release mechanisms

12 months: Test bell positive buoyancy and confirm this is in line with original requirement

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31
Q

Hyperbaric Evacuation Launch Systems should be tested how often?

A

6 months: Thorough visual examination for deterioration

6 months: Practice deployment

12 months: Function test

5 years: Falls should be replaced

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32
Q

What is the testing period for Emergency Survival Packs and Passive Scrubbers?

A

6 months: Visual examination for water ingress and integrity of packaging or container Check condition of passive scrubber charge

6 months: Diving bell survival packs should be unpacked, checked and repacked or returned to the suppliers for overhaul

3 years: Hyperbaric evacuation system survival packs should be unpacked, checked and repacked or returned to the suppliers for overhaul

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33
Q

What is the Common reply frequency of Diver Hand Held Locator?

A

37.5 KHz (Test every 6 months).

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34
Q

DMAC026 state standards for cleaning saturation chamber, toilets and bedding.
How often they should be cleanead?

A
  • The toilet, sink and shower areas, service-locks and their immediate areas, and table surfaces should be cleansed daily.
  • Chamber walls and bulkheads and BIBS masks, etc., should be cleansed twice weekly.
  • Shower-heads should be removed and locked out for cleansing on the surface twice weekly
  • Bedding Changed every 3 days.
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35
Q

IMCA D024 state a minimum volume required for bells with capacity of 3 man.
What is such capacity?

A

The bell should have the following minimum volume, although this is very dependent on the configuration, whether one umbilical is carried outside etc.

2 man bell – 3.0 m3 (105 cu ft)
3 man bell – 4.5 m3 (160 cu ft)
4 man bell – 6.0 m3 (210 cu ft)

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36
Q

As a minimum should be provide two connections as laid down by IMO in A Bell external manifold for emergency. What are they?

A

¾” NPT (female) for hot water

½” NPT (female) for breathing gas

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37
Q

IMCA D024 state that in the bell should be a transponder and strobe light available. What is the frequency of the transponder?
What is the minimum operating durations of the strobe light?

A

Frequency: 37.5 Khz
Strobe: 24h

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38
Q

About the on board gases in the Bell, what are the minimum requirements stated on D024.

A
  • There must be an emergency supply of breathing gas carried on board 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/minute at the maximum depth of the diving operation.
  • The pressure of all onboard gas (both oxygen and heliox) must be reduced to a maximum of 30 bar over ambient before it enters the bell interior
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39
Q

At the end of a bell run, how much oxygen must to be available?

A

Sufficient oxygen 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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40
Q

How often should be tested a heave compensation system?

A
  • A warning (light etc.) should be visible to both the diving supervisor and the winch operator if the heave compensation system is in operation
  • 6 months: Visual examination and function test at maximum SWL as an integral part of the lifting system in the last
  • 12 months: Dynamic test at 1.25 times maximum SWL as an integral part of the lifting system in the last
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41
Q

About digital gauges, what is IMCA D024 states?

A

If the gauge is digital then the display must be large and clear enough to be read in all conditions. It must be clearly marked on the unit whether it reads in feet or metres and it should display the reading to one decimal point.

(Exam Question)

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42
Q

What is the minimum period a heating or cooling system should work continuolsly?

A

If heating (or cooling) is powered by mechanical means (an HRU engine for example) then this should be capable of running for a minimum of 72 hours continuously

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43
Q

What is the minimum gas quantity for HRU gas supply?

A
  • Mixed Gas A minimum quantity of mixed gas must be carried sufficient to compensate for the use of the food lock and to allow for minor leakage. This quantity should be as specified by the diving contractor in their risk assessment
  • Oxygen Sufficient oxygen must be carried to allow for metabolic consumption by the maximum number of divers for 72 hours. This quantity should be as specified by the diving contractor in their risk assessment
  • Oxygen Injection The oxygen supply must be fitted with a device where it is injected at a controlled rate. Typically this will be a flowmeter or similar device
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44
Q

The minimum length for a Umbilical Connection to HRU is ?

A

50 meters

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45
Q

A Certification Registrations should be kept

for how long ?

A

2 or 5 years

PS: All certificates issued under the requirements of this code should be retained in a register for a minimum period of two or five years depending on the item of equipment and its application. This includes the six-monthly certificates which should be retained for two years.

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46
Q

View Ports should be checked how often?

A

6 months: Visual examination in situ

2.5 years: Gas leak test as an integral part of the PVHO to which it is fitted

5 years: Internal overpressure test plus a gas leak test as an integral part of the PVHO to which it is fitted

10 years: Complete renewal from fabrication date

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47
Q

The PMS ( Planned Maintenace System) for Diving chambers and Bells includes tests how often?

A
  • 6 monthly visual examinations
  • 2 1/2 years gas leak test at MWP
  • 5 years internal overpressure
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48
Q

Umbilicals and Pipework should be tested how often?

A
  • 6 monthly function test

- 2 years to MWP

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49
Q

For Man Riding Winches what is the difference between 6 and 12 months test?

A
  • 6 months: function test + static load test each break at Working Weight of Basket/Bell
  • 12 months: static load test each break at 1.25x SWL + Dynamic test of launch/recovery at 1.25x SWL + NDT critical areas.
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50
Q

Main wire termination for Man Riding should be checked every?

A
  • 6 months: function test of Basket/Bell at work weight + Visual examination
  • 12 months: cut back beyond first sheave and destruction test 8:1
    Re-terminate + Function test at working weight
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51
Q

Compressors should be checked for delivery rate and pressure plus gas purity every?

A

6 months IMCA
3 months UK HSE

Check BS EN 12021

CO: 5 PPM
CO2: 500 PPM
Oil: 0.5mg/m3
Water: 25mg/m3 - Compressor outlet
50mg/m3 - at cylinder outlet, pressure 40 - 200 bar
35mg/m3 - at cylinder outlet pressure above 200 bar

In UK Maximum allowable CO is 3PPM

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52
Q

Dry internal cylinders not used underwater should be checked every?

A
  • 6 months external visual
  • 2 1/2 years leak test to MWP
  • 5 years Internal/External visual + Leak test to MWP + if necessary overpressure test
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53
Q

Wet internal cylinders not used U/W should be tested every?

A
  • 6 months: external visual
  • 15 months: internal and external visual + MWP leak test
  • 5 years: as above + 1.5x MWP
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54
Q

Cylinders used underwater according to IMCA D018 should be tested every?

A
  • 6 months: external visual
  • 2.5 years: external/internal + gas leak MWP + hydraulic overpressure test (If necessary)
  • 5 years: as 2.5 years + 1.5x MWP hydrostatic.
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55
Q

Pressure Relief Valves has to be checked for function test at MWP how often?

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

A

d. 30 months

PS: 6 months should be visual

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56
Q

What is SI 2776-1997?

a) U.K. diving regs 1997
b) pipelines act 1997
c) continental shelf act 1997
d) petroleum and submarine pipelines act 1997

A

a) U.K. diving regs 1997

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57
Q

How often should cylinders not used underwater, be overpressure tested?

a) 10 yearly
b) 5 yearly
c) 2 yearly
d) 3 yearly

A

b) 5 yearly

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58
Q

Gas cylinder or quads used in diving ops must have marked on them?

a) weight
b) wall thickness
c) colour and chemical formula of content
d) year of manufacture

A

c) colour and chemical formula of content

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59
Q

Diving plant and diving equipment test certificates are normally in force for?

a) 3 months
b) 6 months
c) 1 year
d) 2 years

A

b) 6 months

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60
Q

IMCA recommends periodic internal examination of bailout bottles for corrosion?

a) every 3 months
b) every 6 months
c) every year
d) every 2.5 years

A

d) every 2.5 years

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61
Q

DMAC recommends not flying intercontinental after a Heliox dive for at least?

a) 4h
b) 12h
c) 24h
d) 48h

A

c) 24h

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62
Q

Depth gauge should be tested every?

a) 3 months
b) 12 months
c) 6 months
d) 24 months

A

6 months ‐ IMCA @ 0.25% Accuracy

HSE ‐ 12 Months

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63
Q

How many standby divers are required for four divers in the water?

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

A

b) 2

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64
Q

Air samples should be taken under BS EN 12021 for a breathing air compressor & analysed every?

a) month
b) 4 months
c) 6 months
d) 12 months

A

c) 6 months - IMCA

HSE: BS EN 12021: UK REGS= 3 months

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65
Q

Multi legged slings should generally be used with the legs at less than what angle to each other, when lifting load?

a) 90°
b) 120°
c) 45°
d) 180°

A

a) 90°

66
Q

Any flexible hoses connected to O2 cylinder should be?

a) HP rubber hoses
b) MP hoses
c) O2 approved hoses
d) LP hoses

A

c) O2 approved hoses

67
Q

A diving umbilical require pressure testing at MWP every?

a) 6 months
b) 12 months
c) 24 months
d) 60 months

A

c) 24 months

68
Q

Static load testing of man-riding equipment takes place every?

a) 3 months
b) 1 year
c) 6 months
d) 2 years

A

c) 6 months

69
Q

Nitrox gas cylinders are usually coloured ?

a) all blue
b) grey body/black top
c) grey body/black and white quarter top
d) pink

A

c) grey body/black and white quarter top

70
Q

Under IMCA international ACoPs, what’s the max depth and bottom time for surface supplied mixed gas wet bell dive?

a) 50msw 30min
b) 50msw 25min
c) 75msw 30min
d) 85msw 30min

A

c) 75msw 30min

71
Q

What’s IMCA, DMAC, SOLAS, IMO, RIDDOR standards for?

A

IMCA - Internacional marine contractors association
DMAC - Diving medical advisory committee
IMO - International maritime organization
SOLAS - Safety offshore life at sea
RIDDOR - reporting injuries, diseases and dangerous occurrences regulations 1995

72
Q

What’s the minimum required team for surface air, mixed gas and saturation diving?

A
  • surface diving: 5
  • surface mixed gas diving: 6
  • saturation diving: 9
73
Q

State colour code for gas cylinders.

A
  • helium: Brown
  • oxygen: white
  • nitrogen: black
  • carbon dioxide: grey
  • argon: dark blue
  • calibration gas: pink
  • inert gases: should be bright green

NOTE: mixture of these gases are colour code in quarters sections on the shoulder of the cylinder.

74
Q

What’s state IMCA D018 plant and equipment?

A

All plant and equipment used in a diving ops must be tested and examined 6 monthly by a competent person and certificate issue. The originals in the contractors office and a copy offshore.

75
Q

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

A
  • 6 monthly visual
  • 2.5 years working pressure leak test (1% max in 24h)
  • 5 years overpressure test

View ports

  • 6 monthly visual
  • 2.5 years leak test
  • 5 year overpressure leak
  • 10 year renewal
76
Q

What’s the period for testing umbilicals and pipework?

A
  • 6 monthly function

- 2 year MWP test and leak test

77
Q

What’s the period for testing man-riding winches?

A
  • 6 monthly visual function + static load test each break @ working weight of basket/Bell
  • 12 months: Independent static load test each break at 1.25x SWL + Dynamic test of launch/Recovery @1.25x swl

Main wire should be rated 8:1.
Cross haul 8:1
- 6 monthly function test @ work weight + visual
- 12 monthly - cut back beyond first sheave and destruction test
- re-terminate and test at work weight

78
Q

What’s the period for testing lifting bags?

A
  • 6 monthly visual test
  • yearly load test at MWL
  • PRV opens at 2 Psi above ambient
79
Q

What’s the period for testing compressors?

A
  • 6 monthly test flow and purity BS EN 12021

Note: UK 3 monthly

80
Q

What’s the period for testing cylinders NOT used u/w?

A
  • 6 monthly external visual
  • 2.5 yearly leak test MWP
  • 5 yearly leak test MWP if required overpressure
81
Q

What’s the period for testing cylinders used underwater?

A
  • 6 monthly external visual ( plus visual internal inspection)
  • 2.5 yearly internal/external visual, gas leak MWP (+ hydraulic test if required)
  • 5 yearly (as 2.5 years plus) 1.5 x MWP hydraulic test.
82
Q

Diving regulations states that a diver must have heat provided in the bell and in the water beyond what depth?

a) 1.5 m
b) 40 m
c) 50 m
d) 150 m

A

C

83
Q

Divers gas must be heated beyond what depth?

a) 40 m
b) 50 m
c) 150 m
d) 160 m

A

C

84
Q

When should you not use PTFE thread tape.

A

Industry and HSE both stipulate that PTFE Tape should not be used on O2 systems

(NB: DVIS 3 – Production of Phosgene Gas is nonsense)

85
Q

Cylinders taken underwater must be given a hydraulic overpressure test to 1.5 x MWP every:

a 5 years
b 1 year
c 4 years
d 6 months

A

a

86
Q

Plant and equipment, (other than cylinders and pressure vessels) used in diving operations, must be tested by a competent person every:

a 6 months
b 2 months
c 3 months
d year

A

A

87
Q

Beyond what depth is it compulsory to use a diving bell?

a 50 msw
b 200 fsw
c 45 msw
d 60 msw

A

A

88
Q

Gauges which directly affect the diver, (i.e., depth gauge, gas supply, pressure gauge) must be tested every:

a 3 months
b 6 months
c 9 months
d 1 month

A

B - IMCA 6 months

U.K. and Norway: 12 months

Note: if doesn’t specify anything in the question, go for the IMCA answer.

89
Q

The Master of a vessel, or OIM, has the authority to:

a Commence a dive
b Commence and terminate a dive
c Terminate a dive only
d No authority at all

A

C

90
Q

Other than test pressures, WP, FV, test date, etc., what information must be displayed on a cylinder containing gas?

a Type and per cent of gas inside
b Percentages of gasses
c Proper colour coded
d Proper colour code, chemical formula, percentages of gases contained.

A

D

91
Q

A wet bell or basket used for transporting a diver to the worksite must meet the following minimum requirements:

a Be capable of carrying two fully dressed divers and safety chain fitted
b Have an emergency gas supply fitted
c Be fitted with overhead protection and used with proper lifting gear
d All of the above

A

D

92
Q

All plant and equipment must be inspected by a competent person:

a 24 hours before diving commences
b 12 hours before diving commences
c immediately before use
d 7 days before diving commences

A

C

93
Q

As a reportable disease, decompression sickness must be reported, in writing to the Health and Safety Executive:

a Within 3 months
b Within 3 days
c Within 28 days
d Within 10 days

A

D

94
Q

The Supervisor should not “hand over” to his relief without:

a Fully brief him of the dive
b Making him a cup of coffee
c Signing his personal log book
d Fully briefing his relief and signing over his command in the dive log book.

A

D

95
Q

Prior to commencement of any diving operation it is the Supervisor’s duty to:

a Fully brief his dive team
b Check all plant and equipment
c Check weather forecast, diver’s logs, certificates, gas supplies
d Check shipping movements, underwater hazards
e All of the above and more

A

E

96
Q

What is the minimum qualification for a diver to work offshore:

a Part I
b Part II
c Part III
d Part IV

A

A

97
Q

Hyperbaric doctor who visits a diving site due to an accident:

a Has legal responsibility
b Advises the supervisor only
c Has control of the treatment table
d Relieves the supervisor on the panel and enters details in the dive log.

A

B

98
Q

HSE Diving Information Sheet recommends that oxygen quad pressure be reduced at source to:

a 20 bar
b 35 bar
c 40 bar
d 50 bar

A

C

99
Q

For safety purposes, what minimum percentage of oxygen in a mix is handled as pure oxygen?

a 25%
b 100%
c 21%
d 50%

A

A

100
Q

Who is responsible for ensuring a risk assessment is carried out prior to the diving project commencing?

a HSE
b Dive Supervisor
c Offshore Manager
d Diving Contractor

A

D

101
Q

Only the minimum amount of gas acceptable for safe diving is onboard, do you?

a Keep quiet. you can cover it in the gas figures
b The divers reclaim is working so it’ll be okay
c Diving must cease until gas stocks are replenished
d The job should finish soon so continue

A

C

102
Q

Who has final responsibility for all checks on diving plant and equipment prior to the commencement of a dive:

a. Bellman
b. Dive Supervisor
c. Standby Diver
d. The Surface Crew

A

B

103
Q

A supervisor needs to have been a qualified diver unless:

a. He was supervising prior to 1984
b. He has successfully passed all the relevant IMCA examinations
c. He was supervising for a 2 year period prior to 1981
d. He has a letter of appointment from a diving contractor

A

C

104
Q

Recording during diving operations should be kept:

a. For a minimum of 8 hours
b. For a minimum of 12 hours
c. For a minimum of 24 hours
d. For a minimum of 48 hours

A

IMCA 24h

U.K. 48h

Note: if doesn’t specify anything in the question, go for the IMCA answer.

105
Q

Closed bell diving techniques should be used when diving deeper than:

a. 30 metres
b. 50 metres
c. 60 metres
d. 75 metres

A

B

106
Q

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

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

A

A

107
Q

Who has the main responsibility for ensuring that a diving project is safely managed:

a. Diving Supervisor
b. HSE
c. The Operator
d. The Diving Contractor

A

D

108
Q

A Dive Supervisor is supervising a job he considers unsafe, does he?

a Stop the job until he feels it safe to continue
b Continue as the Dive Superintendent says to
c Continue as the job has already been risk assessed
d Continue after asking the divers if they want to

A

A

109
Q

The divers suffer some bad burns from a previously unspecified seabed chemical, should?

a It be ignored, it’s just an everyday hazard of the job
b The job is behind schedule so best ignored
c The client should supply details and the job be Re-Risk Assessed
d Dress the wounds and continue using PPE

A

C

110
Q

No man-riding lifting gear-forming part of the diving plant must be tested to 1.5x max SWL….

A) every 6 months
B) every year
C) every 2 years
D) every 5 years

A

B) every year

111
Q

What’s the recommended minimum breaking strain of a bell winch wire?

a) 1.5 x the working load
b) 1.25 x the working load
c) 1.1 x the working load
d) 8 x the working load

A

d) 8 x the working load

112
Q

The lowering system for the diving bells should be controlled by?

a) the drive system of the winch
b) an air motor
c) the secondary break tension spring
d) a pawl or ratchet mechanism

A

a) the drive system of the winch

113
Q

The upper limit for Co2 in breathing air under BS EN 12021 is?

a) 1 mg/m3
b) 50ml.m3
c) 0.05 ml.m3
d) 500 ml.m3

A

d) 500 ml.m3

114
Q

When using a cross-haul wire on a bell, the wire must be?

a) 1.5 x swl of main wire
b) sufficient strength to lift bell to interface
c) 8:1 safety factor
d) 6.5 x swl of main wire

A

c) 8:1 safety factor

115
Q

When should diving plant be examined before diving?

a) 24h before
b) before diving commences
c) 30 days before
d) within 6h before diving

A

b) before diving commences

116
Q

Diving plant electrical equipment should be retested every?

a) 3 months
b) 6 months
c) 2 years
d) 60 months

A

b) 6 months

117
Q

Gas pipe work on a diving system needs pressure testing at max W.P. Every…?

a) 6 months
b) 12 months
c) 24 months
d) 60 months

A

c) 24 months

118
Q

Bell hydraulic winches should be tested ?

a) primary brake dynamically, secondary brake statically
b) primary brake dynamically, secondary brake dynamically
c) primary brake statically, secondary brake dynamically
d) primary brake statically, secondary brake statically

A

a) primary brake dynamically, secondary brake statically

119
Q

Under BS EN 12021 what is the max limit for CO in a breathing air?

a) 1ml.m3
b) 500ml.m3
c) 5ml.m3
d) 15ml.m3

A

c) 5ml.m3

120
Q

Hydraulic power units used for man riding winches should have there hydraulic fluid analyzed or replaced every….?

a) 6 months
b) 18 months
c) 15 months
d) 12 months

A

d) 12 months

121
Q

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

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

A

c) 2 1/2 years

122
Q

Umbilicals are tested every 2 years at?

a) normal working pressure
b) max rate working pressure
c) 1.1 times mwp
d) 1.25 times mwp

A

b) max rate working pressure

123
Q

Hydraulic overpressure retesting is applied to bailout cylinders used underwater how often ?

a) 6 months
b) 2 yearly
c) 5 yearly
d) 10 yearly

A

c) 5 yearly

124
Q

Diving helmets are functioning tested every?

a) 6 months
b) 3 months
c) 3 months gas/ air 6 months comms
d) 1 year

A

a) 6 months

125
Q

A diving project could finish?

a) after the last man leaves the water or chamber
b) when the client declarer complete
c) after the bend watch period
d) when the supervisor runs out of tea

A

c) after the bend watch period

126
Q

With regard to record keeping, what must a diver do?

A

keep for 2 years

update daily logbook

127
Q

What defines “ the contractor”?

A

Is the company in overall control of the diving operations. Defines a management structure in writing.

128
Q

What must a client inform the contractor of?

A
  • details of risk assessments of any possible substance likely to be encountered by the diving team that could be a hazard to their health
  • drill cuttings on the sea bed
  • contaminated effluent
  • chemicals and petroleum products
  • hydrogen sulphide
  • info about any impressed current system
  • radiations sources, details and risk assessments
  • keep divings supervisor informed of any changes of may affect the diving ops
129
Q

What information should be in the dive plan?

A
  • Risk management process, JSAs, toolbox, management and responsibilities of the relevant personnel
  • national and international and flag state standards, regulations, guidelines
  • health and environmental requirements of the country
  • health and security precautions
  • Project safety management system (SMS)
  • personnel roles and responsibilities
  • diving crew familiarization plan and sign off sheets
  • weather working policy
  • diving operating maintenance procedures
  • mob and demob plans
  • detailed step by step work procedures
  • SIMOPS procedures
  • contractors manuals and docs
  • code, standards and reference documents
  • accident/ near-miss investigations procedures
  • deployment of divers and standby divers
  • equipment tool and materials to be used and their deployment
  • equipment audit report and certies
  • permit to work system
  • lift plans
  • minimum gas/breathing mixtures requirements
  • any locations specific hazards identified by the client
  • suitable emergency and contingency plans
130
Q

Whose responsibility is to ensure divers have indate medicals, diver training and first aid certificate?

a) the superintendent
b) the client
c) the diving supervisor
d) the ops manager

A

c) the diving supervisor

131
Q

How long should a voice recordings should be kept assuming no incident occurred during diving ops?

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

A

c) 24h - IMCA reg
d) 48h - UK reg

(EXAM)

132
Q

How long must diving records (logs) be kept for, from a date of the last entry?

a) 2 years
b) 5 years
c) 1 year
d) end of the contract

A

a) 2 years

133
Q

Man riding winches should be tested 6 monthly to what value of the working load?

a) 1.5 times
b) normal working load
c) 1.1 times
d) 1.25 times

A

b) normal working load weight

134
Q

Under what circumstances could Bell winch brakes be tested together on the same test?

a) if there are air on the air winch
b) if they are hydraulic over centre valve operated
c) under no circumstances
d) if they are mechanical

A

c) under no circumstances

135
Q

2% O2 must always be a helium used in diving ops. What’s the minimum required for n2?

a) 100n2
b) 10% O2
c) 2%N2
d) 5%O2

A

c) 2%N2

136
Q

How long is a divers first aid Certificate valid?

a) 3 years
b) 3+ years, if booked refresher course
c) 2 years unless 02 trained
d) unlimited if outside 12 mile limit

A

a) 3 years

137
Q

What is the safe working pressure SWP, used in the offshore industry to removal of marine growth?

A

245 - 690 bar (5.000 - 10.000 psi)

note:
IMCA recommends 210 - 500 (4.000 to 8.000 psi) to clean SA 2 ½.

138
Q

What is de difference between SWL and WLL? and what the stands is for?

A

WLL is the ultimate permissible load assigned by the manufacturer of the item. The SWL may be the same as the WLL but may be of a lower value assigned by an independent competent person taking account of particular service conditions.

SWL: Safe Working Load
WLL: Working Load Limit

139
Q

Regards to Divers certificates and qualifications, what you should you know?

A
  1. Should hold a diving qualification suitable for the work they intend to do;
  2. Will need to have the original certificate in their possession at the site of the diving project

– copies should not be accepted

140
Q

What is the longest period that someone can be asked to work?

A

The longest period a person will be asked to work, and only in exceptional circumstances, will be 16 hours before being given eight hours of unbroken rest.

141
Q

Working periods should be planned so each person is normally asked to work for a maximum of….

a) 8h
b) 12h
c) 16h
d) 24h

A

B) 12h

Work should be planned so that each person is normally asked to work for a maximum of 12 continuous hours, and is then given a 12-hour unbroken rest period between shifts.
(IMCA D014)

142
Q

For diving operations only DP vessels with IMO equipment class 2 or 3 should be used.

True or False

A

True

143
Q

The maximum noise level for hooded and unhooded divers near sonar transmissions is?

A

Hooded: 185db @ 10m away

Unhooded: 175db @ 30m away

144
Q

The use and storage of radioactive materials is governed by ….

A

The Ionising Radiation Regulation 1999’’

145
Q

Activate Alumina absorbs…

a) Helium
b) Air
c) CO2
d) Water

A

d) Water

146
Q

What is the component part whose failure could cause or contribute substantially to a major accident, normally considered to be safety critical equipment?

A

Computer Software

147
Q

Who should be responsable for safeguarding any pipeline inlets under lower pressure than surrounding water?

A

Responsibility of the pipeline owner.

148
Q

Umbilicals should be marked for length at least every …………. meters using a recognised system which allows easy visual identification of the length paid out.

A. 5
B. 10
C. 33
D. 1

A

B

149
Q

Umbilicals should be marked for length at least every ………… feet using a recognised system which allows easy visual identification of the length paid out.

A. 5
B. 10
C. 33
D. 1

A

C

150
Q

OBGs on wet bell should have enough air to last a diver for ………… at his deepest depth.

a. 10 minutes
b. 20 minutes
c. 30 minutes
d. 1 hours

A

C. 30 minutes

151
Q

Internal pressure test of all valves, pipework, fittings, etc. to 1.5 times maximum working pressure when new.

True or False

A

True

152
Q

Drum Capacity The winch drum must be able to accept the full length of wire being used.
This means that there should be a clear space between the outside of the top layer of wire and the edge of the drum flange of at least ……….. the wire diameter.

a. 1 times
b. 2 times
c. 2.5 times
d. 4 times

A

c. 2.5 times

153
Q

Hydraulics and pneumatic hoses must be appropriately supported and secured at intervals not exceeding ……….

a. 1 meter
b. 2 meters
c. 3 meters
d. 5 meters

A

b. 2 meters

154
Q

In a which category a classification society or insurance company surveyor, or Chief Engineer certificated falls in ?

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

A

c. Catergory 3

155
Q

You are transferring gas via a flexible hose. What categories of competent person are qualified to perform a visual inspection of the hose?

a. Category 1
b. Category 1 and 2
c. Category 3 and 4
d. Category 1,2,3 or 4

A

D

156
Q

IMCA does not approve or recognise any doctors for diving medicals.

True or False

A

True

157
Q

What is the minimum allowed content of Chromium and Nickel used in used in oxygen lines systems?

A

22%

Used to operate oxygen lines pressure above 40 bar.

158
Q

What type of material is used for O2 line systems by many contractors that IMCA endorses?

A

Tungum, This is a non-magnetic bronze copper alloy with non-sparking properties. IMCA endorses this policy as the safest, as well as the most convenient, way of proceeding.

PS: Question was on the final exam

159
Q

What material is used to operate oxygen lines above 40bar?

A

High-alloyed Cr-Ni steels with a content of Cr and Ni of together at least 22%.

Cr - Chromium
Ni - Nickel

160
Q

In case of main power loss, the UPS should be able to feed the recording communication system for at least?

a. 10min
b. 30min
c. 1 hour
d. 2 hours

A

b

161
Q

Cross-Haul System should be tested how often?

A

General: Where a winching system is used to traverse the bell horizontally while in the water, and thereby supports part or all of the weight of the bell in water, it must be load and function tested at 1.5 times the weight of the bell in water within the last 6 months.

Bell Diving Supervisors QUESTIONS (15 decks)

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