Oil Tankers. Test 10

Where is the inert gas tapped which is led to the Oxygen Analyser?

Which of the groups contains the three isolating devices fitted between the inert gas bulkhead valve and the cargo tank valves?

Which type of valves are fitted as suction valves on the inert gas blower fans?

How can you be assured that the inert gas analyser will give the correct reading of the oxygen content of the inert gas?

The instrument is calibrated every year in the presence of the Classification Surveyor.
The instrument is calibrated with fresh air every 3 months and should indicate 21 % oxygen in fresh air
A zero setting knob activates a 'Wheatstone Bridge' with a calibrated resistor in order to compare.
The instrument is calibrated with nitrogen holding 3 % oxygen (grey colour test bottle)

How is fresh air supply ensured in cargo tanks via the inert gas supply line?

By opening the suction cover on the inert gas supply fans and stopping the boiler
By removing the fresh air intake blank on the inert gas fan suction line, ensuring that the boiler uptake valve is closed
By stopping the boiler firing so that only fresh air is supplied by the boiler uptake
By keeping the boiler uptake valves closed and opening the inspection cover on the scrubber tower

The correct position for taking a 'bottom' sample is _____

Your vessel is loading liquid oil cargo and oil begins to flow out of a tank vent. Your first action should be to _____

Inert gas- how can you tell if the demister units in the scrubber tower need to be cleaned?

Review Answers