1 Flashcards
State methods of embarking fuel when alongside
RAZ
Road bowser/tanker
Jetty storage tank
Ligher barge
Fixed jetty pipeline
State the flow of fuel from a tanker to the service tanks when RAS
Tanker
Filling trunk
Manifold
Displaced tanks
Centrifuge
Undisciplined tanks
Fuel transfer pump
Service tank
Fuel boost pump
Fuel boost rig main
Engines
Where is fuel generally stored on board and where will they be located
Displaced tanks at the lowest part of the ship
What is the purpose of the fuel tank filling valves
Directs fuel to chosen displaced tanks
What device separates large quantities of water from fuel, and how does it achieve this
Centrifuge
It spins liquid at 5000rpm the water exits as it is heavier than fuel
What level are the undisplaced tanks filled to
95%
What level do the pre filters filter the fuel to
5 microns
What may filters elements be constructed from
Paper
Cloth
Fine wire mesh
Wool
What is the purpose of the coalescer
Removes water down to 10 ppm from the oil
Where does the ready use tank take its supply from, and how does it regulate the correct level
The fuel comes from the undisplaced tank via the fuel transfer pump
What is MBG and where would it generally be found
Micro biological growth
Old stale fuel with sodium content interface
4 tests carried out on fuel and explanation of each one
Visual-fuel needs to be bright and clear
Water reaction test- add 20 ml of water to 80 ml of dual and shake. The interface should not be larger than 2 ml once settled
Colour test - the darker the fuel the older it is using the lovibond colour comparator
Diesel filtration test- diesel filtration test kit used during fuel embarkation to indicate the particulate contamination
What hazards are associated with fuel systems
Fire/ explosion
Toxicity
Dermatitis
Pollution
Define a system
A series of interconnecting pipes and components that will deliver a substance from one point to another
Define an Open loop system
The working fluid is consumed
Closed loop system
The working fluid is reused e.g lube oil
What is a header tank
A reservoir to top up the system
What is a service tank
A supply of clean, water free fuel
Why is a drain tank
Collects oil returning from a system
What is a contents gauge
Clock/dial showing how much fluid is in the tank
What is a gauge glass
A visual indication to tank level (press button to read)
What is a sounding tube
Used to measure the depth of liquid in a tank (dip tape)
What do strainers do
Remove large course particles
What does the type of pipe work depend on
1Type of Fluid
2Temperature and pressure
3Other materials used within the system
High pressure salt water has what piping
Phosphor bronze
Domestic fresh water has what piping
Copper
Lib oil has what piping
Copper nickel
Castings have what piping
Brass
Sewage piping has what piping
Plastic
Define gasket
Non asbestos fibre made of leather,paper,cork,copper or rubber
Define mechanical seals
Rotating components such as pump shafts
Define Keeler ring couplings
Used on high pressure pipe work connections
Define Gland packing
Silicone ,wool, wax- dependant on fluid type, pressure and temp
Purpose of valves
Provide a method of controlling flow or pressure of a liquid or gas or to provide a means of isolating various systems or components
Toes of valves
1Globe valve
2Hate valve
3Flap valve
4Saunders valve
5Ball seated cock
6Relief valve -prevents over pressurisation
7Reducing valve - reduces pressure for part of a system
8Non return valve - prevents reverse flow
9Pressure control valve - maintains pressure ata set level, monitors the outlet pressure
10Rov- remote operation valve - rod gearing or automated
