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ME-175-22-03 > L-Safety > Flashcards

L-Safety Flashcards

1
Q

what are the six major causes of accidents?

A

1.pre-occupation
2.igroance or lack of skill
3.over familiarity
4.laziness / fatigue
5. physical hazards
6.horseplay

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2
Q

why do we need to know the hazards

A

so that we know what to expect when starting a job and what PPE is required

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3
Q

why are SOPs important?

A

as they are written to do the job in the safest way quickly.

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4
Q

why do you need to notice hazards regularly?

A

so that we are always aware of them so always look for danger before starting a job.

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5
Q

what is a electric shock ?

A

current passing through the body to earth

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6
Q

what is human error

A

direct contact with a conductor by a error.
failure to observe safety precautions
not reporting defects
inspect equipment

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7
Q

what is equipment failure?

A

break down of the insulators around the conductor which can then touch the casing
indirect contact.

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8
Q

what is the rough resistance of a human body?

A

1k ohms can be lowered by damp skin

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9
Q

what current can kill you?

A

30mA

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10
Q

is it current or voltage that kills you?

A

current will kill you not voltage

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11
Q

what is the only voltage considered to be safe on board

A

24volts DC
but no supply is really safe

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12
Q

what are the effects of electric shock

A

death / unconsciousness
asphyxia
burns
physiological shock

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13
Q

what happens when you are exposed to 1mA?

A

involuntary response

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14
Q

what happens when you are exposed to 10mA?

A

unable to release hold

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15
Q

what happens when you are exposed to 20mA?

A

physical damage

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16
Q

why is LOTO important?

A

as it prevent the energising of equipment you are working on which could lead to a accident

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17
Q

when can a system can be turned back on
(there u go dale)?

A

when section 2 is completed
only done by team leader or originator

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18
Q

what are the steps to prevent accidents?

A

know the hazards
maintain safety discipline
develop habit of noticing hazards

19
Q

what are the procedure for electric shocks

A

Loud Vocal Alarm
isolate the supply
remove the casualty if possible
DRABC

20
Q

what is the LOTO procedure

A

+
fill out LOTO index sheet
fill out part A B and C of the tag
place part A on the fuse board
Place part B on the LOTO Board
attach part C to the fuse
place the fuse and part C by the LOTO board

21
Q

what is the isolation procedure?

A

obtain permission
identify all isolation points
inform all users
fill out LOTO index and tag
attach part A to fuse empty fuse holder
place part B on LOTO board
place Part C on fuses

22
Q

what are the four hazardous component?

A

tantalum capacitors
selenium rectifiers
penetone / lotoxane
radio active valves

23
Q

what is the danger of a tantalum capacitors?

A

can explode when to much current or voltage is passed through realising sulphuric acid
full face protection required

24
Q

what is the danger of a selenium rectifiers?

A

release toxic dust if burnt out
do not inhale or ingest dust

25
Q

what is the danger of lotoxane?

A

degreaser for electrical contacts
fume inhalation
where gloves
use in ventilated space
do not spray on hot surfaces

26
Q

what is penetone TPC / lotoxane

A

degreaser
12 months shelf life
53 degrees c flash point
keep away from flames
not use on HM submarines

27
Q

what are the signs for radioactive valves?

A

class one - theta signs
class two - trefoil sign with class 2
hazard - trefoil sign with caution

28
Q

what PPE is need for the galley?

A

DMS boots
Sleeves down on 4’s or overalls
chef’s paper hat

29
Q

how do you isolate the galley from outside it?

A

pull the red galley isolation switch

30
Q

what is the most dangerous piece of kit in the galley?

A

Deep fat fryer

31
Q

when should you work on live equipment?

A

when there is no alternative and must be approved by the MEO
and supervised by a ME senior rate
never on HV 1,000v ac or 1,500v dc

32
Q

precautions for working with Live electrical equipment

A

1.do not take unnecessary risks
2.wear rubber glove if practicable
3.use insulated tools
4.stand on rubber insulating mats
5.avoid leaning on bulkheads or equipment(secondary injuries)
6.wear insulating footwear
7.beware of voltage that could become live
8.don’t rely on interlocks or other safety devices
9.don’t bypass safety devices
10.don’t work alone
11.work one handed
12.don’t cause short circuits
13.ensure all portable equipment is tested and in date

33
Q

what are the precautions for working on dead electrical equipment?

A

YOU prove it is dead
isolate and carry out the correct lock out
prove it is dead again using GPTME

34
Q

how do you prove dead?

A

check the voltage between all 3 phases should be 0 volts
check each phase between know good earth
discharge any capacitors and fit with shorting strap

35
Q

what is the job of a change over switch?

A

to allow one piece of kit to use two supplies

36
Q

what are the 3 types of hand change over switches?

A

normal / alternative
normal/ emergency
normal / alternative / emergency

37
Q

what does HCOS stand for?

A

Hand Change Over Switch

38
Q

why do you never change HCOS when running?

A

it will kill the equipment its running

39
Q

how do you supply a motor with a HCOS

A

switch the motor off
wait for it to stop spinning by sight or wait 10 secs
switch to alternative
restart the motor

40
Q

what is high voltage

A

working voltage exceeding 1000 volts AC (RMS) or 1500 Volts DC

41
Q

what are the terms associated with HV

A

HV live ( generating or connected to HV)
HV dead( not generating or receiving HV)
HV safe(all sources discounted and HV decay period elapsed)

42
Q

how are the key personal in terms of HV

A

authorising engineer (MEO)
authorising person in control (APC)
authorising person(AP)
competent person (ME dept.)
HV aware(everyone on board)

43
Q

what is the documentation for HV

A

permit to work(PTW)
sanction to test(SFT)
limiting access(LOA)
switching schedule (SS)

44
Q

what is arc flash?

A

current jumping a air gap between phases/neutral/ earth causing plasma

ME-175-22-03 (15 decks)

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