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According to the Fire Safety Systems Code what is the maximum oxygen content permitted in the cargo tanks of an oil tanker?:
According to the Fire Safety Systems Code which one of the following would be considered a safe amount of oxygen in the output from an inert gas plant?:
According to the instructions in this module, which of these options would be carried out first when starting up a flue gas plant?:
How often must the scrubber be flushed with water?:
If the inert gas at the blower outlet gets too hot a high temperature alarm is given. What will happen if the temperature of the gas continues to rise?:
In an oil cargo tank in which there is a mixture of hydrocarbon gas and air, which of the following is the best definition of the “Lower flammable limit” (LFL)?:
In an oil cargo tank in which there is a mixture of hydrocarbon gas and air, which of the following is the best definition of the “Upper flammable limit” (UFL)?:
In relation to oil tanker cargo spaces which one of the following is the best definition of the expression “gas freeing”?:
In relation to oil tanker cargo spaces which one of the following is the best definition of the expression “purging”?:
In some types of inert gas plants using flue gas, air is supplied to the boiler uptake valves. What is the reason for this?:
In which one of the following IMO publications would you find the requirements for the design of a new inert gas system?:
Many oil tankers are fitted with an inert gas system supplying their cargo tanks. What is the main purpose of introducing inert gas into a cargo tank?:
On an oil tanker how long must the deck water seal supply be left on after the inert gas system is shut down?:
On inert gas plants when the scrubber water flow drops below a certain rate an alarm is given. What will happen if the flow rate drops further?:
In some inert gas plants using flue gas the speed of the blowers is variable. Which of the following is the best explanation for fitting variable speed blowers?:
Select the best option from those given to complete the following statement in relation to protection against excessive vacuum as fitted to the inert gas deck main. The correct operation of the pressure/vacuum breaker is dependent on:
Some oil tankers are fitted with one large inert gas blower and one smaller blower. Which of the following is the best explanation for fitting a small blower?:
The power supply to a flue gas type inert gas plant is normally left on, even when the plant is shutdown. Which of the following best describes the reason for this?:
These diagrams below represent different types of deck seals. Which one is the wet type deck seal?:
What is the Fire Safety Systems Code requirement regarding non return devices in the inert gas main for inert gas systems on oil tankers?:
What is the main risk associated with dilution of a normally inerted cargo oil tank atmosphere with fresh air?:
What is the purpose of the deck water seal fitted to an oil tanker’s inert gas system?:
What is the purpose of the pressure/vacuum breaker fitted to an oil tanker’s inert gas system?:
What is the recommended period for opening up the non-return valve on deck for internal inspection?:
When an oil tanker has a flue gas type inert gas plant which is also used for gas freeing of cargo tanks, where is the air normally drawn from?:
When entering any part of the inert gas system to carry out maintenance or inspections, which of the following is the main danger to personnel?:
When opened up the scrubber unit of a flue gas type, inert gas plant is found to contain a mattress of polypropylene mesh. Which of the following is the best explanation for this mesh being there?:
When the inert gas plant on an oil tanker suffers an automatic shutdown, which one of the options below is true of the seawater pumps and blowers?:
When working inside parts of the inert gas system, such as the scrubber or deck water seal, which procedure must be followed?:
Which of the following are hazards that may exist within a tanker’s inert gas plant if vapors are allowed back from the oil cargo tanks? Select all that apply:
Which of the following best describes the action to be taken by the watchkeeper as soon as the blower in a flue gas type inert gas plant is stopped during shutdown of the plant?:
Which of the following best describes the most likely cause of low deck main pressure while a flue gas type inert gas plant is running?:
Which of the following best describes the most likely cause of the boiler soot blowers failing to work while a flue gas type inert gas plant is running?:
Which of the following best describes the most likely initial consequence of low boiler load when a flue gas type inert gas plant is running?:
Which of the following best describes the reason for the fixed oxygen meter being fitted close to its sampling point?:
Which of the following is the best definition for “inert gas”, as used to protect the cargo spaces of oil tankers?:
Which of the following is the best explanation of the purpose of the scrubber unit in a flue gas type inert gas plant?:
Which of the following is the location that the gas regulating valve is required to be fitted to in inert gas systems on oil tankers?:
Which of the following is the main purpose of filling the free space above the oil cargo onboard a tanker with inert gas?:
Which of the following is the typical oxygen level in the exhaust gas that can be achieved from good combustion in a ship’s boiler?:
Which of the following operations is carried out last when shutting down a typical flue gas plant?:
Which one of the following automatically prevents excessive overpressure or vacuum in the inert gas main?:
Which one of the following is a check that should be carried out on a P/V valve fitted to an inert gas deck main?:
Which one of the following is a maintenance problem that can be seen during an external examination of the blower of an inert gas plant?:
Which one of the following is likely to happen if the oxygen content of the inert gas being supplied to the cargo spaces of an oil tanker rises above 8 % and the “high-high” oxygen alarm sounds?:
Which one of the following is likely to occur if the flue gas temperature is too high at the blower outlet?:
Which one of the following is the generally agreed reason for the rise in explosions experienced in the 1960s and 1970s, as oil tankers became larger?:
Which one of the following is the minimum required capacity of the blowers fitted to an oil tanker’s inert gas plant, as a proportion of the ship’s maximum cargo discharge rate?:
Which one of the following should be done before starting up the flue gas plant?:
Which one of the following would be the best gas to use to zero the fixed oxygen analyser monitoring an inert gas plant?:
Which one of the following would expect to happen if the blower on a flue gas plant tripped out overload?:
Which one of the following would you expect to happen on an oil tanker if the pressure in the inert gas main falls to about 50 mm Water Gauge during cargo discharge operations?:
Which one of the oxygen levels given in the options is the minimum level for the oxygen content in the output from a flue gas plant that you should take action to investigate why the oxygen content is not lower?:
Which term is used to identify the operation whereby inert gas is introduced into a cargo tank in order to reduce the oxygen content throughout the atmosphere of the tank to 8 % or less by volume?:
Which three of the given options are likely causes of high oxygen content indication on the oxygen analyser fitted to a flue gas plant?:
Which two of the following are alarms that are normally found on a flue gas scrubber?:
Which two of the following are alarms that are normally found on an inert gas deck main?:
Which two of the following are items that should be checked during the internal inspection of a flue gas scrubber?: