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AD1 > AD1 Exam Bank > Flashcards

AD1 Exam Bank Flashcards

1
Q

BROCO general rules (8):

A
  • No work of any kind carried out above the diver
  • The work return lead is to be securely grounded to the work or strike plate.
  • The BROCO torch and all power cables are to be fully insulated and checked before diving. Repaired by a qualified electrician only.
  • Only DC power.
  • A +ve double-pole isolator switch must be part of the circuit to protect the diver.
  • The work return (earthing) clamp must be +ve polarity.
  • All torch and oxygen hoses and connections must be free from oil, grease and dirt.
  • the circuit breaker is to be in the ‘COLD’ position unless the diver is actually attempting to strike an arc.
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2
Q

BROCO safety rules (6):

A
  • The diver is to wear gloves. Where possible, diver is to be insulated from the water.
  • Power to be ‘COLD’ as soon as arc is struck and when cutting is not taking place.
  • The diver must signal surface to make sure power is off before changing rods.
  • Under no circumstances is the diver to position himself between the BROCO torch and the work clamp. In doing so they are risking electric shock.
  • Before making cut, check behind target. Cut top to bottom.
  • Arc eye doesn’t happen underwater, but make sure you use welding lens.
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3
Q

What is OSDS max working depth?

A

50m

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4
Q

Min Bailout pressure 9m or shallower?

Min bailout pressure greater than 9m?

Max bailout pressure

A

100 bar

170 bar

232 bar

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5
Q

What size bailout do you need 0-21m

A

7 litre

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6
Q

What size bailout do you need 0-50m

A

12 litre

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7
Q

What does OSDS stand for?

A

Open Space Diving System

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8
Q

What colour a synthetic hose?

What is its shelf life and service life?

A

Yellow

Unlimited years shelf life, 10 years service life

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9
Q

What colour is natural rubber hose?

What is its service life and shelf life?

A

Red

10 years shelf life, 5 years service life

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10
Q

How many rods are in a BROCO rod?

What are they?

How long does a BROCO rod last?

A

7

6 Alloy and 1 Magnesium

60 secs

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11
Q

What pressure should the O2 be set to for BROCO at surface?

What pressure should the O2 be set to for BROCO below 10m?

A
  1. 2 bar

7. 4 bar

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12
Q

How much do you leave at the end of a BROCO rod?

What is the minimum distance that’s you should stay away from the end of a BROCO rod?

What angle are you to cut at?

A

3 inches

100mm

30-90 degrees

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13
Q

How much O2 should stream from the end of the rod?

A

6 inches

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14
Q

GT 18 (HydPac)

Gas consumption

Hydraulic reservoir capacity

Battery

What should you do if unit is to be stowed for over 30 days?

What length hoses do you have and which is which?

A

Gas consumption: 4L/hour

Hydraulic reservoir capacity: 11L

Battery: 12V

What should you do if unit is to be stowed for over 30 days? Add an additive to the fuel tank

What length hoses do you have and which is which?
15m and 30m
5/8 Red bore hose (away from hydpac)
3/4 Blue return hose (back to hydpac)

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15
Q

Concreting safety rules (5)

A
  • Divers employed pouring concrete need voice comms with surface
  • Must wear gloves to avoid chemical burns
  • Never enter for work or construction when pouring
  • Wash off all splashes
  • All additional HSE + CDM regs must be applied
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16
Q

Concerting general rules (7)

A
  • Admixtures should be used if available. If Admixtures not available concrete must be prevented from falling through water. Measures must be taken to prevent cement/fine sand washout after placement.
  • Concrete is to be more free flowing than normal. Plasticisers are to be used if available.
  • Cement content increased by 10-15% to allow for inevitable losses.
  • If work done in stages, Latinate must be removed at every stage by screeing away on completion of each layer.
  • If concrete placed on silt bottom, silt should be removed to prevent it mixing with concrete.
  • allow for difficult working conditions. Do as much on surface as possible.
  • Advance planning is essential. Once concrete is delivered and pouring starts it must not stop.
17
Q

Concreting Methods

A
  • Bags
  • Bottom opening skip
  • Tremie (has go devil plug)
  • Toggle bag
  • Grouted aggregate
  • Pumping
18
Q

What year is ‘diving at work regulations’

What year is ‘Health and safety at work act’

A

1997

1974

19
Q

How heavy is the 17K helmet?

A

13 Kg

20
Q

What is the in service life of the recovery harness?

Where can the expiry date be found?

A

5 years

Harness label

21
Q

How many panels can 1 person operate?

A
  1. therefore 4 divers
22
Q

Umbilical sizes.

Which hose is yellow?
Which hoses are red?
Which hose is orange?

A

40m (we use)
60m
80m (we use)
100m

Yellow - Air supply
Red- Comms and depth cable
Orange - Camera/Lights

23
Q

What is Caloric Vertigo?

What is Alternobaric vertigo?

What is Ostietis Externa (swimmers ear)?

A

Caloric - difference in temp across ears

Alternobaric- difference in pressure across the ears

Swimmers ear - ear infection caused by over equalising/cute and grazes in inner ear.

24
Q

Diving at altitude

What do you add on to the depth of the dive if diving at altitude?
100-300m
300-2000m
2000-3000m

A

100-300m. Add 0.25 of the depth of the dive
300-2000m. Add 0.3 of the depth of the dive
2000-3000m. Add 0.5 of the depth of the dive.

25
Q

Flying after diving

What are the time restrictions for flying after no stop dives and dives with stops?

Think helicopter (300m), small plane (1500m), and commercial flight.

A

Type of dive Min time between diving and flying Max altitude
No stops No restrictions 300m
2 hours 1500m
4 hours Unlimited (commercial)
Stops 2 hours 300m
8 hours 1500m
12 hours Unlimited (commercial)

26
Q

What sizes do the HP supply hoses come in?

A

2m

  1. 5m
  2. 5m
27
Q

What is the required output on the control panel?

What is the panel output capability?

A

11 bar at surface to 16 bar at 50m

0 bar to 20 bar +- 1 bar

28
Q

What does DSMS stand for?

A

Diving safety management system

29
Q

What is the maximum working panel supply pressure?

A

205 bar

30
Q

At what pressures do you inform and change cylinders?

A

Shallower than 21m
Inform @ 60, change @ 50

Deeper than 21m
Inform at 70, change @ 60

31
Q

What are the min and max temperatures for OSDS

Air

Sea water

Fresh water

A

Air: -10 to +50
Sea water: -2 to +35
Fresh water: +2 to +35

32
Q

GT18 (Hydpac)

Fuel:
Engine Oil:
Red:
Blue:
Horse power:
Circuit capacityL
Weight:
Fuel capacity:
Hydraulic Oil:
A 
Fuel: petrol/unleaded
Engine Oil: OMD 90
Red:out
Blue: in
Horse power: 18
Circuit capacity: 30L/min
Weight:149.6 Kg
Fuel capacity: 20.8L
Hydraulic Oil: Biodegradable

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