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 wall thickness must be increased to match the valve rating.
- ✓ The system pressure must be limited to the lowest component maximum allowable working pressure.Correct
- C. A relief valve must be installed immediately downstream of the lower-rated component.
- D. The component must be replaced with one rated to match the pipe's computed pressure.
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.
Cited:46 CFR §56.07-10(a)(2)