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IMCA Sat Supervisor General Knowledge > IMCA Sat Supervisor General Knowledge > Flashcards

IMCA Sat Supervisor General Knowledge Flashcards

Know your ropes

1
Q

What is the recommended ppo2 in a bailout?

A

1.4 max

Or
Bottom mix

Or
0.4 minimum

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2
Q

After a heliox sat a diver with no DCI symptoms should not fly for?

A

12 hours <600m
24 hours >600m

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3
Q

A diver should not dive after a DCS type 2 for how long?

A

1 week

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4
Q

Testing of gas cylinders falls under which British standard?

A

BS 5045

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5
Q

Gas manufacturers generally have an accuracy of ____ percent in the minor component of a mix?

A

0.5 %

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6
Q

Which gas is heaviest… CO \ CO2 \ H2s or N2?

A

CO2

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7
Q

When mixing gas wait how many hours before analysing?

A

6 hours

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8
Q

Maximum depth for a surface oriented stand by in the UK is?

A

50 meters

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9
Q

Maximum length of a bellman’s umbilical in Norway is?

A

40 meters

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10
Q

A skip / half height which is used to deploy a stand-by diver should be large enough for?

A

2 divers with diving equipment

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11
Q

The first action a bellman should take when told to lock out to rescue a diver is?

A

Switch to onboard gas

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12
Q

Soda like works best when it is?

A

Warm and wet

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13
Q

Breathing oxygen should have a purity of?

A

99.5%

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14
Q

Helium should have a purity of?

A

99.97%

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15
Q

The average 16 cylinder quad weighs?

A

1.5 tons

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16
Q

Lifting gear forming part of the diving plant and equipment must be tested to maximum working load every?

A

6 months

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17
Q

Bell primary winch brakes should be tested how?

A

Statically

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18
Q

Bell secondary brakes should be tested how?

A

Statically

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19
Q

Your diver is apparently unconscious, your first action would be to tell the bellman what?

A

Switch to onboard gas

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20
Q

Your diver is suffering hypercapnia, what would you advise the bellman to do?

A

Put the diver on BIBs

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21
Q

Your bellman has just rescued the diver, who isn’t breathing & has no pulse.

What do you advise the bellman to do first?

A

Give CPR and ventilate the diver

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22
Q

The number of DP reference systems that should be in use whilst diving is?

A

2 plus 1 back up

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23
Q

A bell 02 ADDS system requires how many litres per hour per person?

A

30 litres

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24
Q

A bell lift wire is likely to break due to?

A

Internal corrosion of the wire

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25
Q

If the bell internal comms failed, the first action would be to?

A

Call the diver back to the bell

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26
Q

If the bell was entangled on an underwater structure what is your first action?

A

Slack the main lift wire and umbilical

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27
Q

Diving vessels are not required to show diving lights when they are under what length?

A

12 meters

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28
Q

Under AODC guidance notes the diving supervisor may pass over total communications to whom?

A

Another appointed supervisor, who has signed onto the dive log

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29
Q

Divers comms are lost, and the bellman gets a succession of 2 bells on his umbilical - what do you advise the bellman to do?

A

Switch to on board gas, lock out and investigate

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30
Q

A bell ‘snub line’ should have a SWL of at least?

A

5 tons

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31
Q

AODC recommended bell divers minimum gas supply at depth should be?

A

30 minutes duration

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32
Q

A bell bottom door is not required when?

A

When internal pressure under seal is greater than sea bed

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33
Q

Bell life support should have a minimum duration of?

A

24 hours

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34
Q

A bell ADDS system must be fitted to?

A

All TUP bells

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35
Q

On a DP vessel communications must be provided between?

A

Dive control and the ships crane

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36
Q

In conditions of reduced visibility, the final decision about suitability for diving on DP rest with whom?

A

The master of the vessel

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37
Q

The AODC tapping code for do you have a seal is?

A

5 taps

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38
Q

Underwater welding electrolysis produces what?

A

Hydrogen

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39
Q

Underwater welding cables should be insulated along their whole length, but which area is most important?

A

All areas along cable to be insulated

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40
Q

What is the safe noise level for soft hat divers?

A

185 db

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41
Q

What is the recommended breaking strain of a bell wire?

A

8 times the SWL

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42
Q

The lowering system for diving bells should be controlled by?

A

The drive system of the winch

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43
Q

Secondary bell comms must be by?

A

Through water comms

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44
Q

What are the upper limits for CO2 / oil / CO & water in breathing air under BS EN 12021?

A 
CO2 = 500 ppm 
CO   = 005 ppm 
Oil   = 0.5 mg

Water:
40 to 200 bar 50 mg / M3
>200 bar 35 mg / m3

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45
Q

Norwegian emergency breathing rate is?

A

62.5 litres / minute

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46
Q

During a DDC leak test to MWP, what is the maximum leak rate in 24 hours?

A

1%

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47
Q

Bell handling systems should provide mating when?

A

Under any weather conditions

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48
Q

When using a cross hail wire for secondary recovery, the wire must be?

A

Sufficient strength to lift the bell to the interface

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49
Q

Your diver is recovered to the bell with his left thumb missing, and is unconscious, what is your first action?

A

A Airway
B Breathing
C Circulation

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50
Q

In the UK the length of time diving plant can be left without examination prior to diving is?

A

6 hours

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51
Q

Gas contained in a cylinder coloured black with a grey top is?

A

Nitrogen

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52
Q

A chamber view port has a yellowish colour, what would you suspect?

A

Aging of the view port

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53
Q

Liquid oxygen boils at?

A

183 degrees centigrade

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54
Q

Blood and lean muscles hold approximately how much more nitrogen than helium?

A

2.5 times

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55
Q

Expired air contains how much oxygen?

A

16%

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56
Q

When lowering a bell with a side door at atmospheric pressure what should be done with the inner door?

A

Left open until a hydrostatic seal has been proven on the outer door.

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57
Q

When using a bell or stage on a crane hook take what action?

A

Replace the hook with a shackle

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58
Q

If the gas supply to the bell fails for some reason do what?

A

Switch to onboard gas and recover the bell.

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59
Q

If your bell was lost first call who?

A

Bellman on the through water comms

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60
Q

A CO2 analyser works on the principle of?

A

Infrared absorption.

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61
Q

The most common radioactive material offshore is?

A

IR192

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62
Q

CO2 has a molecular weight of?

A

44

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63
Q

Secondary drowning can occur up to how many hours after a near drowning?

A

72 hours and is a hospital case.

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64
Q

What is IMCA DO 18?

A

Initial and periodic testing plant and equipment

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65
Q

Under DO18 topside cylinders require testing how often?

A

6 monthly external
2.5 year MWP
5 yearly hydraulic test plus the above.

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66
Q

How many litres in a cubic foot?

A

28.32

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67
Q

How many FSW in 1 MSW?

A

3.281

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68
Q

What is IMCA D12?

A

Stainless steel pipework and oxygen.

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69
Q

What is IMCA DO50?

A

Minimum gas requirements

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70
Q

What is IMCA DO 6?

A

Diving around pipelines

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71
Q

Greater than how deep is gas heating required?

A

150 msw

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72
Q

1 imperial ton equals?

A

2240 lbs

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73
Q

How many mb of CO2 is allowed in the bell maximum?

A

20

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74
Q

What are the minimum gas requirements for air diving?

A 
Sufficient gas for...
2 X 30 minute rescue dives to depth
1 X max treatment depth in chamber (50m)
3 X decompression cycles in the chamber 
90 cubic meters of medical oxygen
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75
Q

What is IMCA DO 07?

A

Scaffolding

76
Q

Under IMCA DO 07 what is the calculation to work out the minimum allowable horizontal clearance from a scaffolding operation to divers in the water?

A

1.3 X msw depth = minimum horizontal clearance between scaffolding and diving operations.

77
Q

What is the colour of an argon bottle?

78
Q

What is the colour of a nitrogen bottle?

A

Black with a grey top

79
Q

What is the IMCA DO 18 visual inspection schedule for a bailout?

A

6 monthly internal and internal

80
Q

What is IMCA DO 23?

A

Design of air diving system.

81
Q

What is IMCA DO24

A

Design of sat system

82
Q

What is IMCA DO43?

A

Colour coding of gas cylinders, quads and banks for diving operations.

83
Q

What is IMCA DO15

A

Scuba replacement

84
Q

Hemoglobin has an affinity to carbon monoxide how many times greater than oxygen?

85
Q

How many millibars of CO2 can be in a chamber max?

A

5 millibars

86
Q

What is the DMAC 15?

A

First aid to be kept on a dive site

87
Q

What is IMCA D11?

A

Annual audit

88
Q

How many times more does water conduct heat than air?

89
Q

On a vessel what do the lights Red - White - Red mean?

A

Restricted movement ability

90
Q

What is the IMCA DO 18?

A

Initial and periodic examination an testing and certification of diving plant and equipment

91
Q

What is IMCA DO10

A

Diving from DP vessels

92
Q

How soon can you dive after a type two DCS?

93
Q

How soon can you dive again after a type 1 bend?

94
Q

What is the normal onset of a type two bend?

A

10 to 20 minutes and up to 3 hours

95
Q

What are the DO50 requirements for saturation diving?

A

Sufficient gas for…

1) Divers in system to be on BIBs for 4 hours
2) Intended bell runs, plus the same again in reserve (excluding OBG & SPHL)
3) To blow down to intended storage depth and same again in reserve
4) Enough oxygen for metabolic use, make up and deco plus same again in reserve
5) 3 weeks supply of calibration gas

96
Q

What is a maximum single allowable DP movement?

A

10 meters (in two steps of 5m)

97
Q

What colour is an oxygen bottle?

A

Black with a white top.

98
Q

What is the maximum single heading change allowed at one time?

A

15 degrees maximum

99
Q

On a vessel what does a Ball - Diamond - Ball stand for?

A

Restricted maneuvering capabilities

100
Q

Diver heating from 50 meters is?

101
Q

What documents must be kept in dive control?

A

1) Company operations manual
2) Company diving manual
3) Safety management system.

102
Q

What is the recommended flow rate for an analyser?

A

2.5 to 3.5 litres per minute

103
Q

What colour is a calibration gas bottle?

104
Q

The 3 methods of heat loss are ?

A

Conduction
Convection
Radiation

105
Q

Helium conducts heat how many more times faster than air?

106
Q

What is IMCA DO 14?

A

International code of practice

107
Q

What is the IMCA DO 43?

A

Marking and colour coding of gas cylinders, quads and banks for diving.

108
Q

What is the daily CO2 metabolic production of a diver in the chamber?

A

720 litres \ day

109
Q

What is the DMAC 12

A

sonar and diving operations

110
Q

Under what distance does a joint risk assessment have to be conducted between the diving contractor and seismic surveyor?

A

30 kilometres

111
Q

Sea water weighs how much per square metre?

112
Q

Sea water weighs how much per cubic foot?

113
Q

Fresh water weighs how much per cubic foot?

114
Q

How many divisions to IMCA?

115
Q

Name the 4 divisions of IMCA

A

Diving
Marine
ROV
Survey

116
Q

What are the symptoms of a type 2 DCS?

A 
Onset within 1 - 3 hours
Pins and needles
Numbness and tingling 
Pain around waist
Loss of bladder control
Excessive fatigue
Paralysis
117
Q

Describe type 1 DCS

A

Onset usually in 20 minutes… But can be up to 24 hours
Joint pain
Muscle pain
Skin rash (skin bend)

118
Q

What are the signs of oxygen toxicity

A 
Vision (tunnel)
Euphoria
Numbness
Tingling
Irritability
Dizziness
119
Q

Describe cause chronic oxygen toxicity

A

Breathing >27% for a sustained period of time

120
Q

Describe the symptoms of chronic oxygen toxicity

A

Slow onset and recovery
Dry \ burning cough
Tickle in the throat
Burning sensation in the lungs

121
Q

Describe the symptoms of HPNS

A

Muscle twitching
Micro sleep
Dizziness
Nausea

122
Q

Describe acute oxygen toxicity

A

PPO2 >1.6 bar
Fast onset and recovery
Affects brain and spinal cord

123
Q

What is IMCA DO 37?

A

Surface supplied mixed has diving systems

124
Q

What is the IMCA DO 16?

125
Q

What is the IMCA DO 14?

A

International Code Of Practice

126
Q

What is the IOGP 411

A

International Oil & Gas Producers recommended diving practice

127
Q

Hyperthermia is a rise in body temperature of _____ degrees C to over _____?

A

A rise of 2 degrees from 37 degrees to over 39 degrees centigrade

128
Q

Diver heating from surface to 50m is?

129
Q

Definition of a raised PPO2 is?

130
Q

Sounds travels how many times faster in water than air?

A

4 times (1489 meters / second)

131
Q

What is DMAC 15?

A

Medical equipment to be held onsie

132
Q

What is BSEN 12021?

A

British air purity standards

133
Q

Under BSEN 1202 how often should breathing air be tested?

A

Every 3 months

134
Q

Under IMCA how often should breathing air be tested?

A

Every 6 months

135
Q

What are the limits of PP02 wet and dry?

A
  1. 4 wet

2. 8 Dry

136
Q

DO 18 for cylinders that go under water the testing schedule is?

A

2 yearly: Internal & external visual inspection

4 yearly: Hydraulic over pressure test plus internal and external visual inspection

137
Q

What are the CO2 limits?

A

Chamber: 5000 PPM \ .5% SEP

Bell: 20,000 PPM \ 2% SEP

138
Q

Gas consumption rates metric

A

35 litres \ min normal
40 litres \ min emergency
62.5 litres emergency Norway
BIBs 20 litres \ minute

139
Q

Gas construction rates imperial

A
  1. 25 cubic feet / min normal
  2. 5 cubic feet / min emergency
  3. 2 cubic feet / min Emergency Norway
140
Q

How many litres / cubic feet?

A

28.32 litres / cubic feet

141
Q

1 USA ton is how many lbs?

142
Q

How many cubic feet are in 1 cubic mater

A

35.32 cubic feet

143
Q

Describe the frame work of the 1974 Health & Safety At Work statutory instruments

A

SI 2776: Approved codes of practice for diving:

Offshore
Onshore
Scientific
Recreational
Military
144
Q

What is the flow rate for an O2 analyser?

A

2.5 litres a minute

145
Q

What is the flow rate for a CO2 analyser?

A

3.5 litres a minute

146
Q

How many PSI in 1 bar / how many millimetres of Hg?

A

14.5 psi \ 750 mm Hg

147
Q

What is the Archimedes formula?

A

Upthrust = volume X density

148
Q

How soon can you dive after a pneumothorax?

149
Q

How many cubic feet are there in 1 cubic metre?

150
Q

What is the IMCA DO 21

A

Diving in contaminated waters

151
Q

Outline the hierarchy of control of risk

A

Elimination
Substitution
Engineering controls (isolate, enclose, contain, limit)
Administrative controls (policies & procedures)
PPE

152
Q

What are the 5 pathways into the body when diving in contaminated water?

A 
Inhalation
Skin contact
Ingestion
Aspiration
Ionising radation
153
Q

What is considered a safe distance for radiography under water?

A

8 meters

  • If closer exposure has to be less than 7.5 uSV \ hour
154
Q

What is the half life of IR192?

155
Q

Use and storage of radioactive material is governed by?

A

Ionising regulations 2017 & IRR 17

156
Q

In radiography what is an RSO & RPS?

A

RSO = Radiation Safety Officer (person responsible for the source)

RPS = Radiation Protection Supervisor (normally a trained dive supervisor)

157
Q

At what anaesthetic level will a hyper gas alarm at?

A

10% of the level to induce anaesthesia

158
Q

How do you calculate the maximum deco limits for divers in sat?

A

Maximum depth X 1.5 = maximum allowed combined decompression in a given sat.

159
Q

What does the average 64 bottle quad weigh?

160
Q

What are the bounce diving requirements under DO50?

A

1) Enough gas for the planned work + 1 emergency dive to maximum depth
2) Enough to press the DDC to depth twice
3) Enough gas to flush from depth for two decompression cycles
4) Two different LP air sources or one HP source
5) Enough heliox to allow for a treatment saturation and subsequent decompression

161
Q

What are the DO50 requirements for saturation diving?

A

Enough gas for…

1) All divers to be on BIB’s for 4 hours
2) The intended bell runs, plus same again in reserve (excluding SPHL & OBG)
3) Intended storage depth, plus same again in reserve
4) Metabolic / make up & deco, plus the same again in reserve in a separate bank
5) 3 weeks supply of calibration gas

162
Q

What is the normal onset period of a type two bend?

A

10 - 20 minutes…. And up to 3 hours post dive

163
Q

What are the minimum Manning requirements for closed bell diving?

A 
2 Supervisors
2 LSS
2 Techs
2 divers
1 Standby diver

9 men in total

164
Q

What are the given timing parameters for closed bell diving?

A

6 hours maximum in the water
Between 2 to 3 hours in the water before a refreshment break in the bell
Not less than 15 minutes up to 30 minutes with the hat off
8 hours seal to seal

165
Q

Who has to agree to a 28 day extension?

A

Contractors medical advisor, the divers and the supervisor

166
Q

What are the sat surface intervals in the UK?

A

10 days or half time of the first sat, which ever is lesser

ie: A 5 day sat would require 2.5 days out
28 days first sat requires 10 days out minimum

Second surface interval to be not less than the duration of the longest last two sats

  • Over 200m full time out irrespective
167
Q

Under DO2 & HSE ACOP continuous diving operations require a minimum of how many diving supervisors per shift?

A

Two

Direct control of operation identified by the supervisor signed into the log

168
Q

Under IMCA DO2\10 at all times the diving supervisor shall have control of the blow down.

True or False?

169
Q

Describe the emergency gas requirements for closed bell diving

A

1) Enough gas to support each diver, plus bellman, outside the bell for a minimum of 30 minutes @ 40 litres a minute at the maximum depth o the operation.
2) Sufficient O2 for metabolic consumption, X the number of divers, for 24 hours timed from the end of the bellrun.

170
Q

What frequency do the bell transponders work on?

Channel A?

Channel B?

A

Channel A: 38.5 kHz

Channel B: 39.5 kHz

171
Q

What are the minimum emergency valve connections for closed bell diving?

A

1) Hot water

2) Breathing gas

172
Q

What are the through water communications methods?

Primary?

Secondary?

Tertiary?

A 
Primary      = Through water comms
Secondary = Sound powered phone
Tertiary      =  Tapping code
173
Q

What are the two options for stranded bell?

A

1) Thru water transfer

2) Diver or ROV intervention

174
Q

What is the HSE UK ACOP Regulation # 9

A

1 Only one supervisor to be in control of the blow down at one time

175
Q

Describe how a bell winch should be powered?

A

Should have a main & secondary winch motor and a back up power supply for each

176
Q

What must a bell handling system do?

A

1) Lock on & off the system
2) Lower safely through the splash zone without undue spinning
3) Position and maintain the bell at the working depth
4) Allow the bell to be safely recovered to deck
5) Locate the bell accurately even in heavy sea onto the trunking

177
Q

What are the main elements of a bell handling system?

A

1) A frame
2) Winch main cable and guide wires
3) Umbilical handling system
4) Heave comp
5) Cross haul system
6) Secondary recovery system

178
Q

What are the 5 means of communication with lost comms to the bell?

A

1) Sound powered phone
2) Through water comms
3) Flashing bell lights
4) Hand signals to camera
5) Tapping codes

179
Q

What are the 4 means of gaining a divers attention in lost comms to the diver?

A

1) Umbilical pulls
2) Flashing hat light
3) ROV lights
4) Pneumo signals

180
Q

What do you do if not water is lost to your bell?

A

Switch to a back up system and recover the bell

181
Q

What do you do when your sat diver loses gas?

A

1) Diver goes onto bailout
2) Supervisor to change to back supply and inform the diver
3) Switch over to OBG supply
4) Free flow the divers Pneumo
5) Lock in the diver take a seal and recover the bell
6) Investigate the cause of the lost gas situation

182
Q

What is the recommended PPO2 in a diving mix according to DO22

A

0.6 to 0.9 bar

183
Q

What is the recommended PPO2 in a chamber according DO22

184
Q

What are the actions for a bellman for an unconscious diver?

A

1) Switch to onboard gas
2) Deploy the man lift
3) Lockout and follow the divers umbilical
4) Check divers breathing and BoB supply
5) Recover the diver back to the bell

185
Q

A Dreger tube that reads N = 10 is a a surface reading tube, and is not used in the bell

True or false?

186
Q

What are the CO2 limits in the bell?

PPM \ % \ PPco2

A

20,000 PPM \ 2% \ 0.02

187
Q

What are the PPco2 limits for the chamber?

A

5000 PPM \ 0.5 % \ 0.005 PPco2

IMCA Sat Supervisor General Knowledge (1 decks)

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