DieselShip's Online Content Library

Q8. With reference to fire smothering agents explain why:

a) Effectiveness of foam is directly related to its degree of effervescence and surface tension. (6)

b) low expansion foam is best suited for use against localized fire, while high expansion foam is most effective in with major conflagrations,

c) In the absence of foam appliances, water jets can be effectively used against oil fires (5)

Q7. a) Explain working of galley CO2 firefighting control system (8)

b) sketch circuit diagram and explain working of electrical oven fitted in a ship’s galley. (8)

Q9. With reference to the fixed CO2 flooding system for fire fighting on board ships, explain the following:

a) Advantages and disadvantages of CO2 as a fire fighting medium (8)

b) The purpose of providing time delay with a suitable block and line diagram (4)

c) What are the jobs pertaining to the five yearly maintenance routines on the system. (4)

Q8. How will you fight a fire in a purifier room? How will you at least restrict the fire if you are the first person to sight the fire in the purifier room? (16)

Q4. a) Sketch and describe the working of a Sprinkler type, automatic fire detection and firefighting system on ships, labelling it components in the circuit (10)

(b) What maintenance is required periodically? State the routine tests required? (10)

Q8.a) CO2 is to be released in engine room in case of fire. Briefly describe steps taken before it can be released.

b) What means are provided to prevent inadvertent release of CO2 in engine room?

Q5. Write short notes on following:

(a) Flammability diagram and its significance (10)

(b) Risk assessment: why and how it is carried out on ships with examples (10)

Q8. a) Describe CO2 Fixed fire fighting system for machinery spaces and cargo spaces of a bulk carrier. (8)

b) Explain safety precautions taken prior to release of CO2 to the engine room. (8)

Q1. Considering that the engine room is the most common single space on board ships for fire to break out, discuss the merits and demerits of the following fixed firefighting systems: (20)

(a) Carbon dioxide

(b) Pressure water spray

(c) High expansion foam

Q9.a) Draw and Explain flammability diagram (4)

b) What is critical dilution in flammability diagram?  (4)

c) How does inert gas reduce flammability range.

d) Describe purging and gas freeing operation of cargo tank in Crude Oil Tanker. (4)

Q4. During the loading of a petroleum tanker, the incoming cargo forces out from the tank its previous atmospheric contents (air-vapour-inert gas).

Explain:

(a) The dangers of venting during the loading via open tank hatches (10)

(b) Why the pressure/vacuum valves is not used for venting (10)

Q7. How will you fight a fire in a galley? How will you at least restrict the fire if you are the first person to sight the fire in the galley? (16)