USCG Exam PracticePumps, valves, and piping systems
When a piping system component such as a valve has a maximum allowable working pressure lower than that computed for the pipe itself, what does 46 CFR §56.07-10 require?
- A. The pipe must be replaced with a heavier schedule to match the component rating.
- ✓ The system pressure must be limited to the lowest component maximum allowable working pressure.Correct
- C. The component must be replaced with one rated to match the pipe's computed pressure.
- D. A waiver must be obtained from the Commandant before the system is placed in service.
Why B is correct
46 CFR §56.07-10(a)(2) states that where the maximum allowable working pressure of a system component 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. The regulation does not require pipe replacement or a Commandant waiver in this circumstance.
Cited:46 CFR §56.07-10