L SAFETY Flashcards
WHAT ARE THE MAJOR CAUSES OF ACCIDENTS?
- PRE OCCUPATION
- LAZINESS OR FATIGUE
- IGNORANCE OR LACK OF SKILL
- PHYSICAL HAZARDS
- OVER FAMILIRATY
- HORSEPLAY
HOW DO WE TACKLE THE ACCIDENT PROBLEM?
KNOW THE HAZARD, MAINTAIN SAFETY DISCIPLINE, DEVELOP THE HABIT OF NOTICING POTENTIAL DANGERS
WHAT ARE THE MAIN 3 CAUSES OF ELECTRIC SHOCK?
HUMAN FAILURE
EQUIPMENT FAILURE
COMBINATION OF THE ABOVE
WHAT HAPPENS TO THE HUMAN BODY WHEN EXPOSED DIFFERENT TO ELECTRICAL CURRENTS?
1MA- INVOLUNTARY REACTION
10MA- UNABLE TO RELEASE HOLD
20MA- PHYSICAL DAMAGE
30MA- CAN KILL
WHAT VOLTAGE IS CONSIDERED SAFE ON BOARD?
UPTO 30 VOLTS IS TO BE CONSIDERED SAFE TO WORK ON
BEFORE TAGGING OUT A PIECE OF EQUIPMENT WHAT TWO SYSTEMS MUST BE CARRIED OUT?
ALL ISOLATION POINTS ARE TO BE IDENTIFIED
THE EQUIPMENT USER IS TO BE IDENTIFIED
DESCRIBE THE PROCEDURE FOR REMOVING FUSES
- PLACE FINGER IN THE CENTRE OF THE FUSE HOLDER FIRMLY
- WITH THE FREE HAND UNSCREW THE FUSE HOLDER WITH A FUSE KEY
- WHEN UNSCREWED FIRMLY GRASP THE FUSE HOLDER, TURN HEAD AWAY FROM FUSE PANEL AND REMOVE THE FUSE HOLDER SMARTLY
- REMOVE THE FUSE FROM THE HOLDER AND REPLACE THE EMPTY FUSE HOLDER TO MAINTAIN A DEAD FRONT
- REPEAT FOR SECOND AND THIRD FUSE WAY
NAME THE DANGEROUS COMPONENTS AND THEIR ASSOCIATED HAZARDS FOUND ON BOARD HM SHIPS
TANTALUM CAPACITOR- SUBJECT TO CERTAIN CONDITIONS THEY MAY EXPLODE, CONTAIN SULPHURIC ACID
SELENIUM RECTIFIER- TOXIC SUBSTANCES ARE RELEASED WHEN THEY BURN OUT DURING OPERATION
PENTONE TPC
WHAT PRECAUTIONS ARE TO BE TAKEN WHEN USING PENOTONE TPC
- FLASH POINT OF 53’C
- KEEP AWAY FROM NAKED FLAMES
- SUPPLY AND EXHAUST FANS ARE TO BE RUNNING
- NEVER TO BE SPRAYED ON TO LIVE ELECTRICAL EQUIPMENT
- ALWAYS WEAR RUBBER GLOVES
WHAT PPE SHOULD BE WORN WHILST WORKING IN THE GALLEY
CHEF HAT
DMS BOOTS
OVERALL OR NUMBER 4S WITH SLEEVES KEPT DOWN
HOW ARE GALLEY SUPPLIES ISOLATED IN THE EVENT OF A FIRE?
ALL SUPPLIES HAVE ISOLATION SWITCHES OUTSIDE THE GALLEY, THEY ARE ALL PAINTED RED
WHAT IS THE BIGGEST FIRE HAZARD WITHIN THE GALLEY?
DEEP FAT FRYER DUE TO HIGH OIL TEMP OF 180-190’C
WHAT ARE THE PRECAUTIONS TO BE TAKEN WHEN WORKING ON LIVE ELECTRICAL EQUIPMENT?
- DO NOT TAKE RISKS
- WEAR RUBBER GLOVES
- USE INSULATED TOOLS
- TAKE CARE NOT TO CAUSE SHORT CIRCUITS
- WEAR INSULATING FOOTWEAR
- BE AWARE OF 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 ASSISANT KNOWS SAFETY PROCEDURE AND ISOLATION POINTS
- STAND ON RUBBER MATS, AVOID LEANING ON BULKHEADS OR EQUIPMENT
- WORK WITH ONE HAND IF POSSIBLE
- CHECK ALL TEST EQUIPMENT IS IN DATE
WHAT ARE THE PRECAUTIONS TO BE TAKEN WHEN WORKING ON DEAD EQUIPMENT?
- ISOLATE AND CARRY OUT LOCK OFF TAG OUT
- PROVE THE EQUIPMENT IS DEAD USING GPTME
- DISCHARGE ANY CAPACITORS IN THE CIRCUIT USING GPTME SET TO VOLTS
- IF REQUIRED FIT SHORTING STRAPS TO PREVENT CAPACITORS FROM RE-CHARGING
WHAT IS THE CORRECT PROCEDURES FOR THE RESTORATION OF SUPPLIES?
- THE RESTORATION OF SUPPLIES IS CARRIED OUT BY THE PERSON WHO CARRIED OUT THE TAG-OUT
- OBTAIN PERMISSION AND AUTHORITY TO RESTORE SUPPLIES
- REMOVE PART A OF THE TAG OUT AND HAND IT TO THE SENIOUR RATE
- REMOVE PART B FROM THE TAG OUT BOARD AND HAND IT TO THE SENIOUR RATE
- OBTAIN THE CORRECT FUSES FROM THE TAG OUT BOX AND DITCH PART C OF THE TAG OUT
- CHECK EQUIPMENT IS SWITCHED OFF
- REPLACE THE FUSES, TAKING CARE TO AVERT EYES, TO AVOID ARC EYE
- SECTION2 OF THE TAG OUT TASK SHEET IS TO BE COMPLETED AND THE TAG OUT INDEX SHEET CLOSED
- THE COMPLETED SAFETY CERTIFICATE TO BE PLACED INTO SECTION 6 OF THE TAG OUT LOG.
WHAT SHOULD YOU WEAR WHEN WORKING ON TANTALUM CAPACITORS
FACE PROTECTION
LIST THE 3 TYPES OF HAND CHANGE OVER SWITHCES
NORMAL/ALTERNATIVE
NORMAL/EMERGENCY
NORMAL/ALTERNATIVE/EMERGENCY
WHAT SHOULD HAPPEN T0 THE LABELS AFTER REINSTATING A TAG-OUT?
REMOVED AND DESTROYED
WHAT IS THE RESISTANCE OF THE HUMAN BODY WHEN DRY
1 KILLER HOLMES 1000 HOLMES
WHY IS IT IMPORTANT TO AVERT YOUR EYES WHEN REMOVING FUSES?
IN CASE OF ARCING, WHICH CAN DAMAGE EYES
WHEN CARRYING OUT A TAG OUT, WHERE SHOULD PART B OF THE TAG OUT BE PLACED?
ON THE TAG- OUT BOARD
WHY ARE SHORTING STRAPS FITTED TO A 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 is the correct electric shock procedure?
- loud vocal alarm
- isolate person from supply, if possible
- if not able to isolate supply, remove person from supply, safely
- check for response
- if no response, check airway
- check breathing
- keep shouting for help
- if first aid trained, carry out cpr whilst shouting for assistance
state the procedure for isolating supplies
- obtain permissions from senior rate to carry out isolations
- identify points of isolation; this should include alternative supplies, or other energy sources
- inform users and anyone who may be affected by removal of supplies
- fill out entry in index sheet collecting next sequential number
- senior rate and person requiring LOTO to complete relevant sections of the LOTO safety certificate and sign
- complete loto label parts a,b,c
- removes fuses and replace with part a of the label
- place part b of label on loto display board and part c with fuses/keys in box provided
the reason for isolating supplies the loto system
a. Allow maintenance to proceed without hazard to maintainers of equipment
b. isolate equipment that is defective and its operation may be dangerous
c. prevention of the selection of a mode of a equipment operation which may be unavailable or dangerous
d. where supplies have been provided but equipment has yet to be fitted
e. where equipment has been removed
after removing an empty fuse holder what is the procedure for replacing a fuse once you have been given permission
a) collect good fuses from the loto board drawer
b) remove empty fuse holders, and part a of the loto label
c) using approved test equipment, test for voltage across empty fuse ways
d) when replacing fuses, ensure correct size and rating is used
e) averting eyes, locate the fuse carrier smartly onto the bus bar
f) tighten screw threads by hand, then nip tight with a fuse key
procedure for replacing fuses
1 remove empty fuse holder
- using approved test equipment, test for voltage across empty fuse way
- when replacing fuses, ensure correct size and rating is used
- averting eyes, locate the fuse carrier smartly onto the bus bar
- tighten screw threads by hand, then nip tight with a fuse key
what does hv stand for and define its values?
- high voltage
2. 1500 vdc
hazards associated with arc flash list four?
heat: up to 20,000’c
plasma: discharge: ir radiation
light: very intense blinding light. uv radiation
pressure wave: vaporised copper expands up to 67,000 times
shrapnel: molten copper, insulation, pieces of switchboard
sound: at 2m distance 140-165db recorded- permanent hearing damage
smoke: containing poisonous vapours and molten particles
what does the term breakers racked in or out mean
the most likely occurrence of an arc flash event is when breakers are racked in and out and when making or breaking the electrical connections
state when additional testing for dead is done
when there has been any break at work
when handing over to pther personnel
if inspections are required
name 2 parts of the long term loto log
long term index sheet
safety certificate
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 but equipment has yet to be fitted
where the equipment has been removed
what is a competent person responsibilities on a hv system control?
a CP is a person who has sufficient technical knowledge or experience to enable the person to avoid danger from electrical hazards
what does the term hv live mean and its definition
hv live informs personnel that the ship is either generating hv, is capable of generating hv or is connected to an external hv shore supply
what does the term HV dead mean and the definition
- the ship is no longer capable of generating, disturbing or receiving hv.
- all sources of hv supply are disconnected and isolated
- with circuit main earths applied.
what does the term hv safe mean and the definition
informs personnel that as a compartment/area is safe to enter with all forms of hv power source disconnected and the appropriate hv decay periods have elapsed.
this term must only be used in conjunction with the clearly identified compartment/area
give 3 reasons why a long term loto may be required?
equipment which is likely to be out of action for a period in excess of 6 months
equipment which is redundant and for which authority or guidance for removal is awaited
when electrical supplies have been fitted for equipment yet to be installed
when equipment fitted temporarily for a specific operational task or trail has been removed
short term lotos that are in the excess of 6 months old and have yet to be rectified
radioactive valves are broken down into three categories what are they?
class 1 theta sign
class 2 trefoil symbol and words class 2
hazard trefoil symbol and the word caution
work is never carried out on live equipment with voltages above
a. voltages above 1000 vac
b. voltages 1500 vdc
list the 5 examples of human failure that could lead to electric shock
failure to observe proper safety precautions
shoddy work
failure to properly test for portable equipment
familiarity
standing in damp surrounding
how would you prove that a circuit is dead before working on it?
by measuring for zero volts between phases and between phase and earth
what are the 3 items of paper work required for a loto routine?
loto index sheet
loto safety certificate
loto label
loto display board
when you replace the fuses at the fuse panel. how do you prove electrical switches are open or not?
using gptme and measure for zero volts across the empty fuse ways.
after removing an empty fuse holder what is the procedure for replacement of a fuse once you have been given permission
remove empty fuse holders from the fuse key
using approved test equipment, test for 0 voltage across empty fuse ways
when replacing fuses, ensure correct size and rating is used in the empty fuse holder
averting eyes, locate the fuse carrier smartly onto the bus bar
tighten screw threads by hand, then nip tight with a fuse key
list the combination of equipment failure and human error
failure to repair leads when carrying out maintenance routines
use of unapproved test equipment
