Question 922 Deck Safety

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What is the function of the bypass valve on the self-contained breathing apparatus?

A The valve reduces the high pressure in the bottle to about 3 psi above atmospheric pressure.
B When pressure in the apparatus exceeds 7 psi above atmospheric pressure, the valve opens to release pressure.
C In the event of a malfunction in the equipment, the valve can be operated manually to give the wearer air.
D The valve opens in excessive heat to release the oxygen in the bottle and prevent the bottle from exploding.
AI Explanation

The correct answer is C) In the event of a malfunction in the equipment, the valve can be operated manually to give the wearer air. The bypass valve on a self-contained breathing apparatus (SCBA) is designed to provide the wearer with an emergency backup air supply in case of equipment failure. This allows the wearer to safely exit a hazardous environment if the main air supply malfunctions. The other answer choices do not accurately describe the primary function of the bypass valve.

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