L Safety Flashcards
What are the six major causes of accidents?
Pre-occupation
Ignorance/lack of skill
Over familiarity
Laziness and fatigue
Physical hazards
Horse play
What steps need to be taken to minimise a hazard?
Know the hazard
Maintain safety discipline
Develop the habit of noticing potential dangers
What are the basic causes of electric shock?
Equipment failure (non contact)
Human error (contact)
Combination of equipment failure and human error
How much current will cause what reaction?
1mA- involuntary reaction
10mA- prevent from releasing hold
20mA- physical damage
30mA- can KILL
What is the resistance of a dry body and what happens to resistance if the body is damp?
1000 Ohms
Decreases
What is the highest voltage deemed safe in the RN?
24 DC V
Lowest unsafe voltage is 30V
What is the result of electric shock?
Immediate death or unconsciousness
Paralysis of respiratory muscles leading to asphyxia
Electric burns
Physiological shock
What is the electric shock procedure? (8)
Raise alarm
Isolate the person from supply if possible
If not possible stand on a dry insulating material and push or pull casualty clear of contact
Do not touch casualty with hands
When casualty is isolated check for a response
If no response:
Shout for help
Open their airway
Check for normal breathing
Keep shouting for assistance
If first aid trained perform CPR
What are the dangers of tantalum capacitors and how can they be minimised?
Filled with sulfuric acid and can explode
Personnel carrying out servicing are to wear face masks
What are the dangers of selenium rectifiers and how can they be minimised?
Toxic substances are released when selenium rectifiers burn out during operation
Care must be taken to ensure selenium dust is not inhaled or ingested
What is lotoxane and what measures should be carried out when using it?
Only recognised electrical cleaning agent in RN
Should never be sprayed on hot surfaces
Rubber gloves/ PPE should be worn
Used with adequate ventilation
What are the types of radioactive valve and their diagrams?
Class one radio active valve –> theta sign
Class two radioactive valve –> trifold symbol with words class 2
Hazard radioactive valve –> trifold symbol and words caution
What PPE should be worn whilst working in the galley?
DMS Boots
Overalls/ no. 4s with sleeves rolled down
Chefs hat
Where are the galleys isolating switches and how are they recognised?
Outside the galley
Painted red
What is the biggest fire hazard in the galley?
Deep fat fryer
As an ETME when are you permitted to work on live equipment?
When supervised by an ME senior rate
What precautions should personnel working on live equipment take? (8)
Do not take risks
Wear rubber gloves if practical
Use insulated tools if practical
Stand on rubber insulating mats
Avoid leaning on adjacent bulkheads or equipment
Wear insulating foot wear
Beware of voltages
Don’t rely on interlocks
Unless essential do not render interlocks or safety devices inoperative
Do not work alone
Take care so tools don’t cause short circuits
Work with one hand if possible, other in pocket
Check all items of portable equipment have been tested
how do you prove that the equipment is dead?
Isolate and carry out the correct tag-out procedure
Prove it is dead by using an item of GPTME, test between phases and phase and earth
Discharge any capacitors
If required fit shorting straps to prevent capacitors recharging