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LSafety > L Safety > Flashcards

L Safety Flashcards

1
Q

How do we tackle the problem before it happens ??

A

Know the Hazards
Maintain safety discipline
Develop a habit of noticing potential dangers
Fist aid procedures

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2
Q

What are the major causes of accidents ?? (6 marks)

A 
Pre occupation 
ignorance of lack of skill 
over familiarity 
laziness of fatigue 
physical hazards 
horseplay
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3
Q

Causes of electric shock ?

A

Equipment failure
Human error ( direct contact)
A combination of both

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4
Q

What happens to the human body when exposed to different electrical current ??

A

1mA- involuntary reaction
10mA- prevents release
20mA- physical damage
30mA- can kill

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5
Q

What voltage is considered safe on ship ??

A

24V

But no voltage should be considered safe

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6
Q

What are the four sections on a LOTO sheet

A

LOTO index sheet
LOTO safety certificate
LOTO label
LOTO display board

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7
Q

What is the correct electrical shock procedure if they don’t respond ??

A 
Raise alarm LVA 
isolate person from supply if possible 
check for response 
if no response check airway 
check breathing 
keep shouting for help
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8
Q

Before carrying out LOTO on equipment/system what 3 steps must be carried out ??

A

all isolation points must be identified

the equipment user is to be informed

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9
Q

Name the three dangerous components and their associated hazards found on board HM ships

A

Tantalum capacitors- They may explode and contain sulphuric acid
Selenium rectifier- toxic substances are released when they burn out
panettone TPC
Radio active materials

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10
Q

What precautions are to be taken when using penetone

A

flash point of 53 degrees
keep away form naked flames
supply and exhaust fans are to be running
never to be sprayed on electrical equipment
always wear rubber gloves

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11
Q

what PPE should be worn whilst working in the galley

A

Overalls
DMS
Chefs hat

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12
Q

whats the biggest fire hazard within the galley

A

deep fat fryer due to the high oil temp 180-190 degrees

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13
Q

what are the precautions to be taken when working on live electrical equipment

A

do not take risks
wear rubber gloves if possible
use insulated tools
take care not to cause short circuits
wear insulated footwear
be aware of the voltages that are or can be present
do not rely on interlocks or other safety devices
unless essential do not render interlocks or safety devices inoperative
Do not work alone make sure your assistant knows the safety procedure and isolation points
stand on rubber mats avoid leaning on bulkheads or equipment
work with one hand if possible
check that all equipment is in date

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14
Q

what are the precautions to be taken when working with dead equipment

A

isolate and carry the LOTO procedure
prove that the equipment is dead using GPTME
discharge any capacitors in the circuit using GPTME set to volt
is required fit shorting straps to prevent capacitors from re charging

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15
Q

why is it important to advert your eyes when removing fumes

A

in case of arcing which can damage the eyes

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16
Q

when carrying the tag-out where should PART “B” of the tag-out be placed

A

on the tag-out board

17
Q

why are shorting straps fitted to capacitors during maintenance

A

to prevent them from recharging

18
Q

when is it considered safe to work on live electrical equipment

A

when supervised by a senior rate

19
Q

What specific PPE should you wear when working on tantalum capacitors

A

face protection

20
Q

Three types of change over switches

A

Normal/Alternative
Normal/Emergency
Normal/Alternative/Emergency

21
Q

What should happen to labels after reinstating tag-out

A

removed and destroyed

22
Q

What is the resistance of the human body when dry

A

1k ohms

23
Q

What are the reasons for isolating supplies using the LOTO system

A

Allow maintenance to proceed without hazard to maintainers of equipment
isolate equipment that is defective and its operation may be dangerous
prevention of the selection of a mode of equipment operation which may be unavailable or dangerous
where supplies have been provided equipment has yet to be fitted
where equipment has been removed

24
Q

Radio active valves three stages

A

Class one - theta sign
Class two- trefoil symbol and worlds class two
Hazard- trefoil symbol and word caution in black

25
Q

HV ships

A

HV Live
Informs personnel that the ship is either
Generating HV
Is capable of generating HV
Is connected to an external HV shore supply
HV dead
the ship is no longer capable of generating distributing or receiving HV
All sources of HV supply are disconnected
HV safe
Informs personnel that a particular compartment area is safe to entre with all forums of HV power source.

26
Q

Define Competent PersoL Safety

A

A person who has sufficient technical knowledge or experience to enable the person to avoid danger from electrical hazards

27
Q

Hazards associated with Arc flash:

A

HEAT - Up to 20,000 degrees
PLASMA Discharge- IR Radiation
LIGHT- UV Radiation
PRESSURE WAVE- Vaporised copper expands up to 67 000 times
SHARPNEL- Molten copper insulation pieces of switchboards
SOUND- records up to 5kA to 30kA arc

28
Q

Before carrying out LOTO on equipment/system what 3 steps must be carried out

A

Obtain permission from senior rate
Identify all isolation points
Inform anyone who will be affected

29
Q

describe the procedure for removing fuses

A

place finger on centre of fuse holder, use free hand to unscrew fuse holder using fuse key, when unscrewing look away in case of arc flash. Remove fuse from holder and keep safe. Replace empty fuse holder to maintain dead front of fuse panel.

30
Q

when carrying out LOTO where should part b be kept

A

on LOTO board

31
Q

LOTO procedure

A 
Obtain permission 
Points of isolation 
inform users 
Fill out index sheet collect serial numb 
Complete safety certificate 
Complete LOTO label A B C 
Make sure equipment switch is off 
Remove fuse attach par A to empty fuse holder 
Place part B on LOTO board 
Place part C with fuse key in box

LSafety (1 decks)

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