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Questions and Answers
What is a potential consequence of a faulty air compressor during vessel maneuvering?
What is a potential consequence of a faulty air compressor during vessel maneuvering?
Which factor can lead to an air bottle becoming empty?
Which factor can lead to an air bottle becoming empty?
What should be done if a vessel needs to sail with only one functioning compressor?
What should be done if a vessel needs to sail with only one functioning compressor?
What must be conducted if a vessel has to sail while dealing with a non-functional compressor?
What must be conducted if a vessel has to sail while dealing with a non-functional compressor?
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During which situation is it critical for the deck officer to monitor air bottle pressure?
During which situation is it critical for the deck officer to monitor air bottle pressure?
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What is the primary reason a diesel engine requires a high compression ratio?
What is the primary reason a diesel engine requires a high compression ratio?
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What effect does low-speed turning of the engine have on the air within the cylinder?
What effect does low-speed turning of the engine have on the air within the cylinder?
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Which component is essential to maintain the required air pressure for starting the engine?
Which component is essential to maintain the required air pressure for starting the engine?
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What is one reason that can cause the air bottle to get empty?
What is one reason that can cause the air bottle to get empty?
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What can be affected by a leakage in the air line?
What can be affected by a leakage in the air line?
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How many air bottles are typically onboard a vessel for starting the engine?
How many air bottles are typically onboard a vessel for starting the engine?
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What condition must the air bottle maintain in order for the engine to start?
What condition must the air bottle maintain in order for the engine to start?
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In case of compressor problems, what is a potential solution to ensure function?
In case of compressor problems, what is a potential solution to ensure function?
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What is the primary reason a diesel engine needs to turn in order to start?
What is the primary reason a diesel engine needs to turn in order to start?
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In smaller and medium-sized diesel engines, how is the engine typically started?
In smaller and medium-sized diesel engines, how is the engine typically started?
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What is the effect of cold temperatures on diesel engine starting?
What is the effect of cold temperatures on diesel engine starting?
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For large diesel engines, how is starting air supplied to the cylinders?
For large diesel engines, how is starting air supplied to the cylinders?
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Why is the compression of air important in a diesel engine?
Why is the compression of air important in a diesel engine?
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What is a common challenge for starting large diesel engines compared to smaller ones?
What is a common challenge for starting large diesel engines compared to smaller ones?
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What can lead to an empty starting air bottle in a diesel engine?
What can lead to an empty starting air bottle in a diesel engine?
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What happens during the initial stroke of the piston in a diesel engine?
What happens during the initial stroke of the piston in a diesel engine?
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Study Notes
Marine Power Plant (DMARPOWER)
- Course: Semester 1, 2023-2024
- Prepared by: Chief Eng. Hamid Reza Soltani
- Institution: International Maritime College Oman, National University
Marine Diesel Engine (Lesson 13)
- Objectives:
- Discuss reasons for diesel engine needing to turn to start
- Discuss reasons for air bottle emptying
Class Group Task Activity (Task 12)
- Question 1:
- Small/medium diesel engines: start by turning flywheel
- Large diesel engines: starting air supplied directly to cylinder
- Question 2:
- Cold diesel engines harder to start because fuel vaporization is harder at lower temperatures
- Heat gets transferred out of combustion chamber to engine parts, hindering adequate temperatures for ignition.
- Question 3:
- High compression ratio needed.
- Heat from compression ignites the fuel.
- Air skips between piston rings and cylinder liner during low speed turning, increasing sealing pressure.
Class Group Task Activity (Task 13)
- Question 1:
- Air for starting from air bottles on board.
- Minimum air pressure required for engine start.
- Low air pressure in air bottle causes engine failure, require waiting to fill the bottle
- Question 2:
- Multiple reasons for air bottle emptying
- Too many starting kicks on the engine: deck officers must be aware of the number of consecutive kicks
- Problems with air compressor: dual compressors exist usually; one is the emergency compressor. The emergency compressor draws air from the emergency supply
- Leakage in air lines: Air line leakage (deck and engine rooms), resulting in loss during maneuvering can impact engine operation and this is more potentially dangerous if the air compressor is faulty.
- Multiple reasons for air bottle emptying
- Question 3:
- Importance of monitoring air bottle pressure during maneuvering.
- Deck officers must monitor and inform engine room of quickly decreasing pressure
- Question 4:
- Importance of having a working compressor during sailing if only one works
- To address blackouts, having a working compressor is crucial
References
- Wharton, A. J. (1995). Diesel Engines. Oxford.
- Jassal, R. (2016). Marine engineering Principles for Deck Officer.
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Description
This quiz explores key concepts related to Marine Diesel Engines, including the necessity of engine turning for starting, the impact of temperature on starting, and the role of compression in ignition. Ideal for students in the Semester 1 course at the International Maritime College Oman, it reinforces understanding through practical task questions.
