Question 129Steam Plants - 1st Asst/Chief
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, steam safety and relief valves must be provided with a substantial lifting device capable of lifting the valve disc from its seat at 75% of the set pressure. This ensures that the valve can be properly tested and verified to be functioning correctly at pressures below the full set pressure. The other answer choices are incorrect - 0% would not provide any meaningful testing capability, 25% is too low, and 90% is too high and may damage the valve during testing.
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