USCG Exam PracticeBoiler and steam propulsion fundamentals
Under 46 CFR §56.50-30, what is the required design pressure for feed piping from the boiler to and including the required stop and stop-check valves?
- A. Equal to the maximum allowable working pressure of the boiler
- B. The feed pump relief valve setting or the shutoff head of the pump, whichever is greater
- ✓ Exceeding the maximum allowable working pressure of the boiler by either 25 percent or 225 psig, whichever is lessCorrect
- D. Exceeding the maximum allowable working pressure of the boiler by either 25 percent or 225 psig, whichever is greater
Why C 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 maximum allowable working pressure of the boiler by either 25 percent or 225 psig, whichever is less. The 'whichever is greater' formulation is incorrect and would be a more demanding but non-regulatory standard. (46 CFR §56.50-30)
Cited:46 CFR §56.50-30