USCG Exam PracticePumps, valves, and piping systems
Under 46 CFR §56.07-10, when a relief valve is installed to protect a piping system, the relief valve setting must not exceed which pressure limit?
- A. 110 percent of the system's maximum allowable working pressure
- B. 120 percent of the system's maximum allowable working pressure
- ✓ The system's maximum allowable working pressureCorrect
- D. 150 percent of the system's maximum allowable working pressure
Why C is correct
46 CFR §56.07-10(b)(2) states that the relief valve setting must not exceed the maximum allowable working pressure of the system. The 120 percent figure refers to the pressure at which the manufacturer must certify the rated relieving capacity, not the set pressure limit.
Cited:46 CFR §56.07-10