USCG Exam PracticeBoiler and steam propulsion fundamentals
Under 46 CFR §56.50-30(a)(3), feed piping from the boiler to and including the required stop and stop-check valves must have a design pressure that exceeds the maximum allowable working pressure (MAWP) of the boiler by which of the following?
- A. 50 percent of MAWP or 450 psig, whichever is less
- ✓ 25 percent of MAWP or 225 psig, whichever is lessCorrect
- C. 10 percent of MAWP or 100 psig, whichever is greater
- D. 25 percent of MAWP or 225 psig, whichever is greater
Why B is correct
46 CFR §56.50-30(a)(3) specifies that feed piping from the boiler, to and including the required stop and stop-check valves, must have a design pressure which exceeds the MAWP of the boiler by either 25 percent or 225 psig, whichever is less. The 'whichever is less' qualifier is critical and distinguishes this from the distractor options that use 'whichever is greater' or different percentages.
Cited:46 CFR §56.50-30