L Safety Flashcards
How do we tackle the problem before it happens ??
Know the Hazards
Maintain safety discipline
Develop a habit of noticing potential dangers
Fist aid procedures
What are the major causes of accidents ?? (6 marks)
Pre occupation ignorance of lack of skill over familiarity laziness of fatigue physical hazards horseplay
Causes of electric shock ?
Equipment failure
Human error ( direct contact)
A combination of both
What happens to the human body when exposed to different electrical current ??
1mA- involuntary reaction
10mA- prevents release
20mA- physical damage
30mA- can kill
What voltage is considered safe on ship ??
24V
But no voltage should be considered safe
What are the four sections on a LOTO sheet
LOTO index sheet
LOTO safety certificate
LOTO label
LOTO display board
What is the correct electrical shock procedure if they don’t respond ??
Raise alarm LVA isolate person from supply if possible check for response if no response check airway check breathing keep shouting for help
Before carrying out LOTO on equipment/system what 3 steps must be carried out ??
all isolation points must be identified
the equipment user is to be informed
Name the three dangerous components and their associated hazards found on board HM ships
Tantalum capacitors- They may explode and contain sulphuric acid
Selenium rectifier- toxic substances are released when they burn out
panettone TPC
Radio active materials
What precautions are to be taken when using penetone
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
what PPE should be worn whilst working in the galley
Overalls
DMS
Chefs hat
whats the biggest fire hazard within the galley
deep fat fryer due to the high oil temp 180-190 degrees
what are the precautions to be taken when working on live electrical equipment
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
what are the precautions to be taken when working with dead equipment
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
why is it important to advert your eyes when removing fumes
in case of arcing which can damage the eyes
when carrying the tag-out where should PART “B” of the tag-out be placed
on the tag-out board
why are shorting straps fitted to capacitors during maintenance
to prevent them from recharging
when is it considered safe to work on live electrical equipment
when supervised by a senior rate
What specific PPE should you wear when working on tantalum capacitors
face protection
Three types of change over switches
Normal/Alternative
Normal/Emergency
Normal/Alternative/Emergency
What should happen to labels after reinstating tag-out
removed and destroyed
What is the resistance of the human body when dry
1k ohms
What are the reasons for isolating supplies using the LOTO system
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
Radio active valves three stages
Class one - theta sign
Class two- trefoil symbol and worlds class two
Hazard- trefoil symbol and word caution in black
HV ships
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.
Define Competent PersoL Safety
A person who has sufficient technical knowledge or experience to enable the person to avoid danger from electrical hazards
Hazards associated with Arc flash:
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
Before carrying out LOTO on equipment/system what 3 steps must be carried out
Obtain permission from senior rate
Identify all isolation points
Inform anyone who will be affected
describe the procedure for removing fuses
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.
when carrying out LOTO where should part b be kept
on LOTO board
LOTO procedure
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
