Question 181Steam Plants - Assistant Engineer
70% to passCoast Guard Regulations, 46 CFR Part 54, require steam safety and relief valves to be provided with a substantial lifting device, capable of lifting the disc from its seat at what percentage of the set pressure?
A0%
B25%
C75%
D90%
AI Explanation
The correct answer is C) 75%. According to 46 CFR Part 54, which covers pressure vessels, the regulations require that steam safety and relief valves must be provided with a substantial lifting device capable of lifting the valve disc from its seat at a minimum of 75% of the set pressure. This ensures that the valves can be properly tested and inspected to confirm they will function as intended in an emergency situation. The other answer choices are incorrect because 0% would not allow for any testing, 25% is below the 75% regulatory requirement, and 90% is above the minimum 75% threshold specified in the regulations.
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