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L Safety > Gh > Flashcards

Gh Flashcards

1
Q

What are the major causes of accidents

A 
Physical hazards 
Ignorance
Over familiarity 
Laziness 
Preoccupation 
Horseplay
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2
Q

How do we tackle the accident problem

A

Know the hazard- know the precaution
Maintain safety discipline
Develop habit of noticing potential danger

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3
Q

What are the 3 main cause of electric shock

A

Equipment failure
Human failure
Combination of both

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4
Q

What happens to the body when exposed to these Electric currents: 1mA
20mA
10mA
30m

A

1mA = involuntary reaction
20mA physical damage
10mA - prevents from releasing hold
30mA- can kill

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5
Q

What voltage on board is considered to be safe

A

24VDC

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6
Q

What is the correct electric shock procedure

A
  1. LVA
  2. isolate person from supply
  3. if you can’t use wood or something else to Get them away
  4. check for response
  5. keep shouting for help
  6. check airway
  7. check breathing
  8. Keep shouting for help
  9. cpr if first aid trained 30 compressions 2 rescue breaths
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7
Q

Before tagging out a piece of equipment what 3 steps must be carried out

A
  1. Obtain permission from senior rate ME to carry out isolations
  2. All isolation points are to be identified
  3. equipment user must be informed
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8
Q

Describe the procedure for removing fuses

A
  1. Place finger in the centre of the fuse holder firmly
  2. With the free hand unscrew the fuse holder w fuse key
  3. grab the the fuse holder, turn head and remove & remove the fuse holder
  4. remove the fuse from holder put the empty fuse holder back to maintain a dead front
  5. repeat for second & third fuse way
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9
Q

Dangerous components and their hazard on board HM ships

A

Tantalum capacitors - explodes & releases sulphuric acid -wear face protection

Selenium rectifiers - toxic dust released when they burn out - wear rubber gloves & face protection

Penetone tpc lotoxane - 53 flash point 12 month shelf life don’t spray on named flames and hot surfaces - rubber gloves fan upper deck & face covering

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10
Q

What PPE should be worn when working in the galley?

A

DMS BOOTS
CHEFS HAT
OVERALLS OR 4S SLEEVES ROLLED UP

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11
Q

How are all galley supplies isolated in the event of a fire?

A

All supplies have isolation switches outside galley painted red

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12
Q

What is the biggest fire hazard within the galley

A

Deep fat fryer due to high oil temp of 180-190 degrees

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13
Q

What are the precautions to be taken when working on LIVE electrical equipment (8marks)

A
  1. Don’t Take risks
  2. rubber gloves
  3. use insulated tools
  4. don’t use short circuits
  5. wear insulated footwear
  6. don’t work alone
  7. work with one hand if you can
  8. check test equipment is up to date
  9. stand on rubber mats
  10. be awAre of voltages
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14
Q

Precautions to take when working on DEAD equipment

A
  1. Isolate and carry out LOTO procedure
  2. prove equipment is dead using GPTME
  3. discharge capacitors using GPTME set to volts
  4. fit shorting straps when needed to prevent capacitors from recharging
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15
Q

What is the procedure to follow when removing a LOTO

A
  1. obtain permission
  2. sign LOTO safety certificate for removAL
  3. collect the correct fuses, Part B&C label
  4. make sure circuit isolation switches are open
  5. Remove part A and empty fuse holder, using a GPTME set voltage measure across the empty fuse way, if it’s 0 put the fuse back in fuse holder and the fuse holder back in fuse way then repeat for fuseway 2&3
  6. Return LOTO labels ABC to senior rate
  7. Sign safety certificate for LOTO removal &closure
  8. close LOTO index sheet entry
  9. Destroy label put certificate in section 6 of log book
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16
Q

What specific PPE should you wear when working on Tantalum capacitor

A

Face protection

17
Q

3 types of hand change over switches

A

Normal/alternative
Normal/emergency
Normal/alternative/emergency

18
Q

What should happen to labels after reinstating a tag-out

A

Removed and destroyed

19
Q

What is the resistance of the human body, when dry

A

1k omega / 1000 omega

20
Q

Why avert your eyes when removing fuses

A

In case of sparks

21
Q

When carrying out a tag - out where should part B go

A

On the tag out board

22
Q

Why are shorting straps fitted to capacitors during maintenance

A

To prevent them from recharging

23
Q

When is it considered safe to work in live electrical equipment

A

When supervised by a senior rate

24
Q

Three categories for radioactive valves

A

Class 1 theta sign
Class 2 “class 2”
Hazard “caution”

25
Q

Work is never carried out on voltages above what?

A

1000 vac

1500 vdc

26
Q

How would you prove that a circuit is DEAD before working on it

A

Measuring for 0 volts with GPTM phase to phase phase to earth

27
Q

3 items needed for a LOTO routine

A

Label
Index sheet
Safety certificate

28
Q

How do you prove electrical switches are open or not

A

Using GPTME measure for 0 volts across the fuse ways

29
Q

5 examples of human failure that can lead to electrical shock

A 
Shoddy work 
Familiarity 
Damp surroundings
Not following safety precautions 
Not testing equipment beforehand
30
Q

4 hazards associated with arc flash

A

Heat
Sound
Smoke
Light

31
Q

What is a component person

A

Someone trained and experienced enough to help someone avoid danger from electrical hazards

32
Q

What does HV live mean

A

Generating HV or is connected to an external HV shore supply

33
Q

HV DEAD?

A

Can’t generate , distribute or receive HV

Sources of HV supply are disconnected and isolated

34
Q

HV SAFE?

A

Compartment or area has no HV supply

35
Q

Term breakers RACKED IN OR OUT MEAN

A

Arc flash event breaks electrical connection

36
Q

State when additional testing for DEAD need to be done

A

Hand overs to new personnel
Break in any work
Inspections

L Safety (1 decks)

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