Podcast
Questions and Answers
What triggers an alarm in the atmosphere according to the text?
What triggers an alarm in the atmosphere according to the text?
Vapourised oil condensing and forming white mist
What does the oil mist detector do in terms of levels of white mist?
What does the oil mist detector do in terms of levels of white mist?
Triggers an alarm when mist levels are below those of an actual explosive condition
What is the purpose of a crankcase relief valve in the event of a crankcase explosion?
What is the purpose of a crankcase relief valve in the event of a crankcase explosion?
To deal with pressure wave and flames
What are the elements resulting from an initial crankcase explosion?
What are the elements resulting from an initial crankcase explosion?
What material is the valve disc of a crankcase relief valve typically made of?
What material is the valve disc of a crankcase relief valve typically made of?
What is the purpose of the large diameter spring in a crankcase relief valve?
What is the purpose of the large diameter spring in a crankcase relief valve?
What is the function of the external deflector in the construction of a crankcase relief valve?
What is the function of the external deflector in the construction of a crankcase relief valve?
What is the purpose of fitting a test weight to an overspeed device?
What is the purpose of fitting a test weight to an overspeed device?
How do many diesel engines utilize compressed air in starting the engine?
How do many diesel engines utilize compressed air in starting the engine?
What advantage do air start valves direct into individual cylinders provide in starting diesel engines?
What advantage do air start valves direct into individual cylinders provide in starting diesel engines?
What is the risk associated with air start valve systems if key equipment fails?
What is the risk associated with air start valve systems if key equipment fails?
Why is it preferable to trip an overspeed device at a lower speed?
Why is it preferable to trip an overspeed device at a lower speed?
Explain how an overspeed trip of the centrifugal type operates.
Explain how an overspeed trip of the centrifugal type operates.
What is the common use of compressed air in starting diesel engines?
What is the common use of compressed air in starting diesel engines?
State TWO methods of detecting a potential crankcase explosion.
State TWO methods of detecting a potential crankcase explosion.
When the engine crankcase oil mist detector activates, what actions must be taken by the on-watch engineer?
When the engine crankcase oil mist detector activates, what actions must be taken by the on-watch engineer?
Sketch a crankcase explosion relief door and label the MAIN components.
Sketch a crankcase explosion relief door and label the MAIN components.
Explain why crankcases may have relief valves fitted.
Explain why crankcases may have relief valves fitted.
Outline the circumstances which may cause the relief valves to operate.
Outline the circumstances which may cause the relief valves to operate.
What does the 'Gain' represent in governors?
What does the 'Gain' represent in governors?
State a safety detection system that may be fitted in diesel engine crankcases.
State a safety detection system that may be fitted in diesel engine crankcases.
State the implications of a much higher value on the engine crankcase pressure gauge and the immediate actions to be taken.
State the implications of a much higher value on the engine crankcase pressure gauge and the immediate actions to be taken.
How do electronic governors differ from mechanical governors?
How do electronic governors differ from mechanical governors?
Outline the checks and investigations to ascertain the cause of increased crankcase pressure.
Outline the checks and investigations to ascertain the cause of increased crankcase pressure.
What is the role of the comparator in an electronic governor system?
What is the role of the comparator in an electronic governor system?
What are some of the sensors used in an electronic governor system?
What are some of the sensors used in an electronic governor system?
How does the electronic governor system control the speed of the engine?
How does the electronic governor system control the speed of the engine?
How does the speed sensing unit of the hydraulic governor respond to an increase in engine speed?
How does the speed sensing unit of the hydraulic governor respond to an increase in engine speed?
What happens to the pilot valve when the speed sensing unit moves the weights outwards?
What happens to the pilot valve when the speed sensing unit moves the weights outwards?
How does the downwards movement of the servo piston affect the fuel supplied to the engine?
How does the downwards movement of the servo piston affect the fuel supplied to the engine?
What role does the feedback link play in controlling the engine speed?
What role does the feedback link play in controlling the engine speed?
How does the pilot valve react to the movement of the weights back inwards?
How does the pilot valve react to the movement of the weights back inwards?
What is the aim of the hydraulic governor in response to load changes affecting speed?
What is the aim of the hydraulic governor in response to load changes affecting speed?
What is another term used to describe 'amplification' in the context of the hydraulic governor?
What is another term used to describe 'amplification' in the context of the hydraulic governor?
