L safety Flashcards
What are the 6 major causes of accidents?
- Pre- occupation - personal worry, distractions
- Ignorance, lack of skill
- Over familiarity, repetition leads to loss of attention to detail
- Laziness and fatigue
- Physical hazards, oil on deck, unguarded machinery, toxic processes.
- Horseplay, messing around not paying attention to your surroundings.
What are the 3 steps you can take to eliminate the accident problem
- Know the hazard - know the precaution
- Maintain safety discipline
- Develop the habit of noticing potential dangers
What are 3 three basic causes of electric shock?
- Equipment failure (indirect contact)
- Human failure (direct contact)
- combination of equipment failure and human failure
State an example of equipment failure
Break down of insulation causing an appliance to become live.
State some examples of human failure.
- Failure to observe proper safety precautions
- Familiarity
- shoddy work
- standing in damp surroundings
- failure to properly test portable equipment
State 2 examples of combination failure (human and equipment)
- Failure to repair leads when carrying out maintenance routines.
- Use of unproven test equipment
What would these 4 different levels of current do to the human body? 1mA 10mA 20mA 30mA
1mA - Involuntary reaction
2mA - Prevent you releasing your hold
20mA - Physical damage
30mA - Can cause death
What is the resistance of the human body when dry?
What factor can decrease the resistance?
- 1kohm
2. The resistance could be lower if the skin is damp
What is the only safe voltage onboard?
24v DC
State the electric shock procedure.
- Raise the alarm (LVA)
- Isolate person from supply, if possible, e.g. switch off supply, open breakers
- if step 2 is not possible, stand on a dry insulating material and try to push or pull the casualty clear of the contact, using similar insulating material as a lever.
- When the casualty is isolated from the supply, check for a response. Shake the casualty by the shoulder and ask loudly ‘are you alright?’
- Shout for help
- Open and check the airway
- Check for normal breathing.
- If you are qualified you should carry out CPR and keep shouting for assistance until help arrives.
What are the purposes of lock off - tag out? (LOTO)
- Allow maintenance to proceed without hazard to maintainers
- Isolate equipment that is defective and dangerous.
- To prevent selection of modes of equipment which may be dangerous.
- Where supplies have been provided but equipment has yet to be fitted
The LOTO consists of five sections or parts what are they?
- The LOTO index sheet
- The LOTO safety certificate
- LOTO label
- LOTO display board
- The removed equipment
The short term tag-out log is comprised of six parts. What are they?
- Instruction and TEM’S
- Audit records
- Index
- New LOTO certificates
- LOTO safety certificates in force
- Closed LOTO certificates
What are the reasons a Long term LOTO would be required?
- Equipment which is likely to be out of action for a period in excess of six months.
- Equipment which is redundant and guidance is needed for removal.
- When electrical supplies have been fitted for equipment yet to be installed.
- Temporary equipment needed for a specific purpose has been removed.
- Short term LOTO’S that are in excess of 6 months old and have yet to be rectified.
What are the 2 parts that comprise the Long term LOTO?
Part 1 - Long term LOTO index
Part 2- Long term LOTO safety certificate
State the procedure for Isolations
- Obtain permission from senior rate to carry out isolations
- Identify all points of isolation
- Inform users and any one who may be affected by removal of supplies.
- Fill out entry in index sheet and collect next sequential serial number
- Senior rate and person requiring LOTO to complete relevant sections of LOTO safety certificate and sign
- Complete LOTO label parts A, B and C. Then turn off equipment
- Remove fuses and attach part A of LOTO label to empty fuse holder
- Place part B of LOTO label on LOTO board and place part C of LOTO label, with fuses, in box provided.
State the procedure for replacing fuses
- Remove the empty fuse holder from the fuse way
- Using approved GPTME test for voltage across the empty fuse way to ensure the fuse way is dead.
- Use the correctly rated fuse to stop cable burnouts.
- Averting eyes, locate the fuse carrier smartly onto the bus bars.
- Tighten with fuse key whilst holding the fuse carrier firmly in place.
- The person completing the LOTO should have parts A,B and C in their possession for inspection by senior rate.
- Complete section 2A of the LOTO safety certificate.
Where are tantalum capacitors found?
Inside AVR’S on ship.
What is the purpose of a tantalum capacitor?
To store an electrical charge.
What is the hazard of a tantalum capacitor?
What PPE should be used when working on this component?
- Under certain conditions these components can explode spraying adjoining components and personnel with sulfuric acid.
- Face protection
What is the purpose of a selenium rectifier?
To change AC voltage to DC voltage
Where can selenium rectifiers be found?
In winches and capstans
What is the hazard when working with selenium rectifiers?
Toxic substances are released when rectifiers burn out.
What is Penetone TPC used to clean?
Electrical components