USCG Exam PracticePumps, valves, and piping systems
According to 46 CFR §56.07-10, relief valves are required at pump discharges EXCEPT for which type of pump under what condition?
- A. Reciprocating pumps that are fitted with a bypass line back to the suction
- ✓ Centrifugal pumps so designed and applied that a pressure in excess of the system maximum allowable working pressure cannot be developedCorrect
- C. Gear pumps whose discharge pressure is limited by a manufacturer-installed pressure regulator
- D. Centrifugal pumps installed in non-vital systems only
Why B is correct
46 CFR §56.07-10(b)(1) states that relief valves are required at pump discharges except for centrifugal pumps so designed and applied that a pressure in excess of the maximum allowable working pressure for the system cannot be developed. The exception is specific to centrifugal pumps meeting that design criterion, not to pump location in vital versus non-vital systems.
Cited:46 CFR §56.07-10