USCG Exam PracticeBoiler and steam propulsion fundamentals
Under 46 CFR §56.50-30, 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 amount?
- A. 10 percent or 100 psig, whichever is greater
- ✓ 25 percent or 225 psig, whichever is lessCorrect
- C. 25 percent or 225 psig, whichever is greater
- D. 10 percent or 150 psig, whichever is less
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 exceeding the boiler MAWP by either 25 percent or 225 psig, whichever is less. This is a specific regulatory value that must not be confused with the greater-of or different-percentage alternatives. (46 CFR §56.50-30)
Cited:46 CFR §56.50-30