USCG Exam PracticePumps, valves, and piping systems
Under 46 CFR §56.07-10, when the maximum allowable working pressure of a valve installed in a piping system is lower than the pressure computed for the pipe itself, how must the system pressure be determined?
- A. The system pressure is set at the pressure computed for the pipe, and the valve is replaced with one of higher rating
- ✓ The system pressure must be limited to the lowest maximum allowable working pressure among all system componentsCorrect
- C. The system pressure is averaged between the pipe rating and the valve rating
- D. The system pressure is set at 120 percent of the valve's rated working pressure
Why B is correct
46 CFR §56.07-10(a)(2) states that where the maximum allowable working pressure of a system component such as a valve or fitting is less than that computed for the pipe or tubing, the system pressure must be limited to the lowest of the component maximum allowable working pressures.
Cited:46 CFR §56.07-10