NAVIGATION ENGLISH 
What are main duties of the Third Engineer?
The Third Engineer is usually responsible for the following.
1.Watch-keeping from 0800 to 1200, and from 2000 to 2400 every day;
2.Giving assistance to the First Engineer in all technical matters;
3.Operation and maintenance of other auxiliary machinery except those under the charge of the Second Engineer;
4.Taking positive measures in the safe and efficient operation of all machinery, and guarding against fire and oil pollution;
5.Safety procedures and maintenance of all safety equipment, and engine control system in a thoroughly efficient state;
6.Carrying out instructions relating to ballasting and de-ballasting, and recording the operation;
7.Testing the telegraph before departure and recording all engine movement in the Bell Book for staying in the engine room when vessel is entering or leaving a port or when the engine is on stand-by or in maneuvering;
8.In charge of Emergency fire pump and lifeboat engine.
How do you maintain Emergency Battery?
I should check and fill in some distilled water, or electrolyzed solution (电解液) if necessary, erase the oxide and test the gravity of the specification periodically. The record shall be made after work is done.
Describe the procedure for starting an emergency generator.
1.To check the lube oil level in the crankcase and fuel oil level in the tank;
2.To see whether there is any leakage;
3.To check the air pressure if the generator is the air-started model; and to check the battery voltage to see whether it is normal if the generator is the battery-started model;
4.Also to make sure there are no obstacles around the machine.
What chemicals did you use to treat the boiler water? When you test alkalinity and acidity of water in boiler by PH test paper? The result shows the boiler water is in acidity. Please describe what the possible cause is.
I have ever used the following brand chemicals: Unitor, Drew and so on.
We should keep the boil water’s PH scale between 10.5 and 11.5.
If the water become of acidity (Ph scale is below 10), it is may be caused by following reasons:
The water has not been given enough blow-down, or has not been filled enough alkalinity chemicals.