Auxiliary Machinery. Test 25 – Online Maritime Tests

The principal objects for boiler feed water treatment should be:

Prevention of scale formation in the boiler and feed water system by (a) using distilled water or (b) precipitating all scale forming salts into a non-adherent sludge.
Prevention of corrosion in the boiler and feed water system by maintaining the boiler water in an alkaline condition and free from dissolved gases.
Control of the sludge formation and prevention of carry over with the steam.
All of the mentioned reasons.

The main purpose of the superheater vent valve on the boiler is

Lower too high superheater pressure after shut down
Ensure a flow of steam through the superheater when raising steam pressure after shut down
Remove air from the superheater
Remove water from the superheater

If the refrigerating compressor has been running satisfactorily for a long period of time but suddenly the compartment temperature started to rise, the trouble might be

Solenoid valve jammed shut
Expansion valve has water frozen in it
All alternatives
A refrigerant leak has developed

The fuel oil separator (ALCAP) bowl discharge is not working properly

Broken water seal.
Opening water function missing.
Water outlet valve is not closing properly.
Back pressure in oil outlet too high.

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