USCG Exam PracticeBoiler and steam propulsion fundamentals
According to 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 exceeding the maximum allowable working pressure (MAWP) of the boiler by which of the following amounts?
- A. 10 percent or 100 psig, whichever is less
- ✓ 25 percent or 225 psig, whichever is lessCorrect
- C. 25 percent or 225 psig, whichever is greater
- D. 50 percent or 500 psig, whichever is less
Why B is correct
46 CFR §56.50-30(a)(3) states 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. The 'whichever is greater' option is a common distractor but is incorrect. (46 CFR §56.50-30)
Cited:46 CFR §56.50-30