Cargo Handling. Operations. Test 6 – Online Maritime Tests

What measures should be taken in order to avoid explosive gases to form on top of coal cargoes?

Cover the top of the cargo by tarpaulins
Keep hatches and ventilators closed and airtight
Ventilate the holds as well as possible
Moisten the top of the cargo by water at the completion of loading

During a ship to ship cargo transfer operation it is required that:

None of the listed alternatives need be maintained.
An efficient engine room watch with the main engine on standby be maintained.
The main engine be on 1 hour notice.
The main engine be on 1/2 hour notice, and no watch need be maintained in the Engine room.

Before loading ore cargo, any spaces which previously contained oil, even if not being used for ore (example - wing tanks on an O/O carrier) should be cleaned and gasfreed. On the ore loaded voyage these spaces should:

Be kept completely sealed?
Be re-inerted after cleaning and gasfreeing?
Be checked at regular intervals for gas which might be released perhaps from sludge deposits; and if such gas found, the tank to be re-gasfreed?
Be kept sealed after filling a foot of water in the bottom to prevent gas evolution from bottom sludge?

Under normal circumstances 21% O2 is diluting toxic gases, which one are we talking about?

Sulfur, monoxide, hydro chloride, carbon dioxide?
None to be diluted?
Natrium monoxide, ferro chloride, hydrogen sulfide dioxide?
Carbon monoxide, nitrogen dioxide, nitric oxide, sulfur dioxide?

How would you ventilate your cargo holds when sailing from hot climate to cold climate?

Ventilate excessively?
No ventilation should be done?
Ventilation only during night time?
Ventilate only during day time?

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