Fire Prevention, Fire Fighting. Test 20

Instructions for 'Preparation for welding or hot work in cargo tanks' is laid down by the Norwegian Maritime Directorate. Which of the following requirements regarding welding or hot work corresponds to these instructions?

A common certificate for hot and cold work permit shall be used.
Check list and certificate to be signed by the chief engineer and a licenced welder.
Before hot work or welding in tanks is started, a complete set of duly signed check lists and certificates shall be provided.
A complete set of check lists and certificates to be issued by the safety officer for each tank.

If the place work cannot be satisfactory cleaned by washing, it shall be cleaned chemically.
Only spark free tools to be used for cleaning of tank bottoms and for sediments removal.
If the hot work is to be carried out at the bottom of the tank, the entire bottom shall be thoroughly cleaned and all sediments removed.
Areas difficult to clean shall be covered by fire-resistant material.

Tanks adjacent to the tank where work is to be carried out shall be cleaned and free of gas.
In ships for which inert gas system is not required, separate cleaning procedures may be used for non-adjacent tanks.
In ships for which inert gas system is not required, all non-adjacent cargo tanks shall be washed with water.
The pipe systems shall be cleaned after tanks are cleaned and gas measured.

Instructions for 'Preparation for welding or hot work in cargo tanks' is laid down by the Norwegian Maritime Directorate. During ongoing inspection on work in cargo tanks, the gas concentration shall be checked:

Every hour.
Every fourth hour.
Every second hour.
Every 30 minutes.

Measuring of tank atmosphere shall be performed by one explosimeter.
When the tank has been satisfactory cleaned there shall be a 24 hour quarantene. Ventilation to be stopped and gas measuring to be carried out every second hour.
When the tank has been satisfactory cleaned.
Ventilation from deck may only be carried out with the ship's inert gas fans.

The entering permit shall be based on the check-list for gas freeing and check-list for equipment and preparedness.
The entering permit shall be signed by the Sen.Off.Deck only.
The entering permit shall be signed by the safety officer only.
For a ship at sea, at least 24 hours shall have elapsed from completion of tank cleaning to the tank may be entered.

If the ventilation has been stopped for more than 30 minutes, new gas measurement shall be carried out before the tank is reentered.
If the mechanical ventilation is stopped, the tank shall be left within 5 minutes.
The tank shall have been mechanically vented for at least two hours before it is entered for inspection or work.
The tank shall be mechanically ventilated as long as there is people in it.

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Fire Prevention, Fire Fighting. Test 20

Fire Prevention, Fire Fighting. Test 20

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