L-Safety Flashcards
what are the six major causes of accidents?
1.pre-occupation
2.igroance or lack of skill
3.over familiarity
4.laziness / fatigue
5. physical hazards
6.horseplay
why do we need to know the hazards
so that we know what to expect when starting a job and what PPE is required
why are SOPs important?
as they are written to do the job in the safest way quickly.
why do you need to notice hazards regularly?
so that we are always aware of them so always look for danger before starting a job.
what is a electric shock ?
current passing through the body to earth
what is human error
direct contact with a conductor by a error.
failure to observe safety precautions
not reporting defects
inspect equipment
what is equipment failure?
break down of the insulators around the conductor which can then touch the casing
indirect contact.
what is the rough resistance of a human body?
1k ohms can be lowered by damp skin
what current can kill you?
30mA
is it current or voltage that kills you?
current will kill you not voltage
what is the only voltage considered to be safe on board
24volts DC
but no supply is really safe
what are the effects of electric shock
death / unconsciousness
asphyxia
burns
physiological shock
what happens when you are exposed to 1mA?
involuntary response
what happens when you are exposed to 10mA?
unable to release hold
what happens when you are exposed to 20mA?
physical damage
why is LOTO important?
as it prevent the energising of equipment you are working on which could lead to a accident
when can a system can be turned back on
(there u go dale)?
when section 2 is completed
only done by team leader or originator
what are the steps to prevent accidents?
know the hazards
maintain safety discipline
develop habit of noticing hazards
what are the procedure for electric shocks
Loud Vocal Alarm
isolate the supply
remove the casualty if possible
DRABC
what is the LOTO procedure
+
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
what is the isolation procedure?
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
what are the four hazardous component?
tantalum capacitors
selenium rectifiers
penetone / lotoxane
radio active valves
what is the danger of a tantalum capacitors?
can explode when to much current or voltage is passed through realising sulphuric acid
full face protection required
what is the danger of a selenium rectifiers?
release toxic dust if burnt out
do not inhale or ingest dust
what is the danger of lotoxane?
degreaser for electrical contacts
fume inhalation
where gloves
use in ventilated space
do not spray on hot surfaces
what is penetone TPC / lotoxane
degreaser
12 months shelf life
53 degrees c flash point
keep away from flames
not use on HM submarines
what are the signs for radioactive valves?
class one - theta signs
class two - trefoil sign with class 2
hazard - trefoil sign with caution
what PPE is need for the galley?
DMS boots
Sleeves down on 4’s or overalls
chef’s paper hat
how do you isolate the galley from outside it?
pull the red galley isolation switch
what is the most dangerous piece of kit in the galley?
Deep fat fryer
when should you work on live equipment?
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
precautions for working with Live electrical equipment
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
what are the precautions for working on dead electrical equipment?
YOU prove it is dead
isolate and carry out the correct lock out
prove it is dead again using GPTME
how do you prove dead?
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
what is the job of a change over switch?
to allow one piece of kit to use two supplies
what are the 3 types of hand change over switches?
normal / alternative
normal/ emergency
normal / alternative / emergency
what does HCOS stand for?
Hand Change Over Switch
why do you never change HCOS when running?
it will kill the equipment its running
how do you supply a motor with a HCOS
switch the motor off
wait for it to stop spinning by sight or wait 10 secs
switch to alternative
restart the motor
what is high voltage
working voltage exceeding 1000 volts AC (RMS) or 1500 Volts DC
what are the terms associated with HV
HV live ( generating or connected to HV)
HV dead( not generating or receiving HV)
HV safe(all sources discounted and HV decay period elapsed)
how are the key personal in terms of HV
authorising engineer (MEO)
authorising person in control (APC)
authorising person(AP)
competent person (ME dept.)
HV aware(everyone on board)
what is the documentation for HV
permit to work(PTW)
sanction to test(SFT)
limiting access(LOA)
switching schedule (SS)
what is arc flash?
current jumping a air gap between phases/neutral/ earth causing plasma
