Theory 1 Flashcards
What is a system
Series of interconnecting pipes and components to deliver a substance from one point to another
What’s an open system
Fluid is consumed
Closed system
Fluid is reused
3 ways to measure tanks
Sounding tube
Gauge glass
Contents gauge
Material used in the system depends on
Type of service applied
Operating temp
Material in system
Phosphor bronze use
HP sea water
Brass pipe use
Casting
Copper pipe use
Fresh water
Plastic pipe use
Sewage
Copper nikel
Lub oil
Gasket materials
NAF, paper, leather, cork, rubber
3 types of seal
Mechanical seal
Keelering coupling
Gland packing
What do valves do
Valve control flow of a liquid
What does a reducing valve do
Turns high pressure to low pressure
2 types of Pump
Dynamic displacement
Positive displacement
Types of thermometers
Fixed brass
Pocket
Clock
What do pressure control valves do
Maintain system pressure
What does rod gearing do
Mechanical control from remote location
What do accumulators do
Stores potential energy
Smooths out pulsations
3 types of accumulators
Piston
Bag
bladder
What is valve overlap
Both valves open while piston at TDC to promote airflow and get fresh air in and exhaust air out the cylinder
Applications of diesel engines
Diesel generator
Propulsion
Air compressors
Fire pumps
Coolant mix
Al 39 + fresh water, 50:50
Piston rings uses
Compression
Prevent oil in combustion chamber
Transfers heat
Lubricate the liner
What does crankshaft do
Turns reciprocating motion to rotary motion
What does fly wheel do
Promotes smooth running of engine
Carries through non power strokes
What does an injector do
Measured atomised fuel into top of cylinder
What does relief valve do
Protects other components
4 oil tests
Water in oil
Acidity/total base number
Viscosity
Insolubles
Fuel system diagram components
Service tank: Filling line Strainer Vent Water drain
Lift pump
Dual Filters
Injector pump
Injectors
Change over cock
Sea water cooler diagram
Sea cock Strainer S.W pump Lub oil cooler Fresh water cooler Engine block Sump Strainer Relief valve FW pump Thermostat Header tank
