Exam Question
With respect to tankers describe
(a) How pump room and cargo tanks are ventilated
(b) The main problem of carrying liquefied natural gas
(c) How the boil off from liquefied natural gas is handled.
Class 2 (2nd Engineer)
MEKG
📅 Dec 2018
Reference Answer
(a) Tanker Pump Room Ventilation
Pump rooms on tankers are required to be mechanically ventilated . The ventilation system must be of the exhaust type and designed to prevent the accumulation of flammable vapors. To ensure this, the system needs to have a minimum capacity of 20 air changes per hour based on the gross volume of the space. The exhaust fans must be a non-sparking type , and the air ducts should be arranged to provide effective ventilation throughout the entire space. The discharge from the exhaust fans must be led to a safe location on the open deck.
Cargo Tank Ventilation
Cargo tanks are ventilated to make them "gas free," which means removing flammable or toxic vapors. This can be achieved using portable fans or blowers . These fans must be constructed to prevent incendiary sparking, for example, if the impeller were to touch the casing. The fans must also have sufficient capacity and penetration to quickly gas-free the entire tank atmosphere.
Pump rooms on tankers are required to be mechanically ventilated . The ventilation system must be of the exhaust type and designed to prevent the accumulation of flammable vapors. To ensure this, the system needs to have a minimum capacity of 20 air changes per hour based on the gross volume of the space. The exhaust fans must be a non-sparking type , and the air ducts should be arranged to provide effective ventilation throughout the entire space. The discharge from the exhaust fans must be led to a safe location on the open deck.
Cargo Tank Ventilation
Cargo tanks are ventilated to make them "gas free," which means removing flammable or toxic vapors. This can be achieved using portable fans or blowers . These fans must be constructed to prevent incendiary sparking, for example, if the impeller were to touch the casing. The fans must also have sufficient capacity and penetration to quickly gas-free the entire tank atmosphere.
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