Coast Guard Regulations (46 CFR) require...

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Question 1 of 205eccef9bbacbc34ba4d455b8

Coast Guard Regulations (46 CFR) require safety and relief valves for air service to be provided with a substantial lifting device, capable of lifting the disk from its seat when the pressure in the vessel is __________.

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🔍 Key Concepts

• 46 CFR requirements for safety and relief valves on air service systems • Purpose of a lifting device / test lever on a safety or relief valve • Relationship between set pressure and the pressure at which the valve’s lifting device must still be able to operate

💭 Think About

• Think about why the Coast Guard wants you to be able to lift the valve disk before it reaches its full set pressure — what are you trying to test or verify? • Is it safer for the required lifting pressure to be below, equal to, or above the set pressure, and why? • Among the choices, which percentage would still clearly be in a safe range for testing while giving a meaningful check of valve operation?

✅ Before You Answer

• Verify in 46 CFR, Part 52 or Part 54/56 style provisions dealing with safety and relief valves and test levers for air or steam service, not fuel or hydraulic systems • Check the exact wording around “substantial lifting device” or test lever and the phrase “capable of lifting the disk from its seat when the pressure in the vessel is …” • Confirm whether the regulation specifies a value less than, equal to, or greater than the set pressure, then match that to the closest answer choice

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