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Air 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 - 8000)

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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.

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

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

19
Q

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

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.

20
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

21
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.

22
Q

What is the most commom material used in O2 line systems by many contractors, endorsed by IMCA?

A

'’Tungum’’, is a non-magnetic bronze copper alloy with non-sparking properties.

23
Q

What is a ‘‘bomb test’’?

A

Tests are carried out to determine the compatibility of a material for use in oxygen-enriched or pure oxygen atmospheres at pre-designated pressures. A vast amount of information has been gathered on the compatibility of materials.

24
Q

What is the most commom visual test done to determining the oxygen cleanliness?

A

UV light @ (3600-3900 Angstrom)

All cleaned components should be clearly marked “CLEANED FOR OXYGEN
SERVICE”. Any components not marked should be cleaned prior to use.

25
Q

What is the minimum amount of cylinders it can be used in a portable diving systems?

A

At least 3 horizontally mounted cylinders, each with a minimum foldable volume of 46 litres and a working pressure of not less than 150bar (2175 psi). The cylinders must be manifolded through the dive control panel so that the diver and standby diver each have a dedicated supply. A third cylinder should be provided which can be switched on to either supply.

Air Diving Supervisors QUESTIONS (12 decks)

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