Main Engine Construction and Safety

Question 1

What are chocks for

Answer 1

They act as a vibration barrier between the main engine and the tank top
Limits the movement of the main engine from the vessel

Question 2

What are two different types of chocks

Answer 2

Resin
Iron

Question 3

What could cause a main engine to trip and shut down

Answer 3

Overspeed
Low lube oil pressure (0.2 bar and falling)
High cooling water temperature
OMD can cause shutdown on some engines
Emergency stop

Question 4

How does the emergency stop on a main engine work

Answer 4

It racks out the fuel rack so that no more fuel can get to the engine
This can be done hydraulically, electrically or pneumatically

Question 5

What is an OMD and how does it work

Answer 5

Oil Mist Detector
It checks the density of the oily mist in the crankcase and alarms when it reaches a set point
It can be done by using a light source to check the light obscuration in a reference tube

Question 6

What might happen if high levels of oil mist are present in the crankcase

Answer 6

It could cause a crankcase explosion