Question 873 Deck Safety

70% to pass

When using a high-velocity fog stream in a passageway, the possibility of a blow back must be guarded against. Blow back is most likely to occur when _______________.

A a bulkhead collapses due to heat and pressure
B the only opening in a passageway is the one from which the nozzle is being advanced
C pressure builds up in the nozzle which causes a surge of water
D pressure in the fire hose drops below 100 psi
AI Explanation

The correct answer is B) the only opening in a passageway is the one from which the nozzle is being advanced. When using a high-velocity fog stream in a passageway, the possibility of blow back is most likely to occur when there is only one opening, which is the one the nozzle is being advanced through. This is because the pressurized water stream can create a back pressure in the passageway, forcing the water to blow back towards the nozzle operator. The other answer choices, such as a collapsing bulkhead or pressure drops in the fire hose, are not directly related to the specific scenario of using a high-velocity fog stream in a confined passageway.

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Official Resources
46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
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