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Q5. A.  During the weighment of CO2 bottles required for total flooding of Engine room, it was observed that few bottles are less than the original capacity.  State the reasons for the same and checks / tests to be made prior refilling;

B. State how often the CO2 bottles are required to be weighed and pressure tested.

Q2. Explain in detail how you would isolate CO2 Fixed firefighting system foe routine maintenance. Please enumerate the Maintenance schedules and their frequency performed on this system. Describe all tests and inspections you would make and how you would return the system to service.

Q5. With reference to fixed CO2 system for fighting machinery space fires:

a) sketch a CO2 bottled system.

b) How the number of CO2 bottles required for ship is calculated?

c) explain how the system sketched in part (a) is protected from overpressure

d) Describe the periodic maintenance required.

Q7. a) C02 is to be released in engine room in case of fire. Briefly describe steps taken before it can be released. What means are provided to prevent inadvertent release of C02 in engine room? (12)

b) Briefly discuss the procedure for re-entering the engine room after the release of CO2. (8)

Q8. Describe CO2 fixed firefighting system for machinery spaces and cargo spaces of a bulk carrier. Explain safety precautions taken prior to release of CO2 to the engine room. (20)

Q4. What maintenance and checks are carried out on CO2 bottles:

a) Weekly

b) Monthly

c) Yearly

d) 2 Yearly basis and

What schedule is followed for pressure testing of the bottles. (20)

Q2. a) C02 is to be released in engine room in case of fire. Briefly describe steps taken before it can be released. (7)

b) What means are provided to prevent inadvertent release of C02 in engine room? (7)

c) How the number of CO2 bottles required for a ship is calculated? (6)

Q5. a) List the precautions that must be taken before releasing CO2 into the engine room in the event of a fire. Why is it critical to ensure these steps are followed to safeguard crew and equipment? (7)

b) Describe the actions that should be taken immediately after CO2 release to manage the fire and prevent re-ignition. (6)

c) Explain the factors that determine the quality of CO2 required for effective fire suppression in ship’s engine room. Outline the formula and method used to calculate the number of CO2 bottles needed on board. (7)

Q8. a) Sketch and describe a total flooding CO2 gas system suitable for the protection of machinery spaces. (8)

b) State, with reasons, which valve should be operated first in the system shown in (a).  (8)