Fuels Flashcards
What is the ratio of AVCAT AND DIESO combination and why is it used
Mixed at a ratio of 50:50
Used to prevent the dieso fuel from waxing
Can only be done with WO 1 fuels permission
What precautions should be take into account when fuelling
Fuel expansion (don’t fill more than 95%)
Fire and explosion
Over pressured hoses
Smoking and naked lights
Inform ship of fueling
Prevention of spills
What is the purpose of emergency fuel accumulators and how many are used
Two emergency fuel accumulators
Provide enough fuel for electrical supplies to be restored in power loss
Enable controlled GT shutdown at 8 mins idle and 2 mins full power
What contaminates could get in fuel
Water
Dirt (fuel derived)
Sodium
Surfactants (detergents)
Microbiological contamination MBCs or SRBs
When can water enter fuel
Embarked during fueling
Condensation in tanks
Leaks in tanks
When can dirt enter fuel
Due to degradation of fuel
When can surfactants enter fuel
After tank cleaning
What is the marine engineering departments maintenance for fuel systems
To supply filtered fuel in the mains
Draining of fuel to main storage
Maintinenxe and replacement of fuel system components (filters, valves and hoses)
The operation of shut off cocks and changeover cocks for the fuel system
Filtering of fuel with portable filters where needed
Main components of the filter/water absorber and where
Fluted rod - inside compressed paper discs
Compressed paper discs - inside main housing
Differential pressure gauge - external between main and upper housing
Division plate - between main and upper housing
How does the hose end pressure controller function
Air pressure is used as the control datum and can easily be adjusted to suit aircraft needs
Control to within 5 + PSI can be achieved up to 500gal/min
When is the water test carried out for AVCAT
Prior to embarkation
Every 10 mins during embarkation
Prior to flying stations and every 24 hours when flying
24 hours after embarkation
Before and after transferring
After heavy ship movements
What can the WO 1 do on ships
Fuel advice for systems
Ship fuel safety visit
Help order fuel
Help calibrate fuel gauges
