USCG Exam PracticePumps, valves, and piping systems
Under 46 CFR §56.07-10, relief valves are required at pump discharges EXCEPT for which type of pump under specified conditions?
- A. Reciprocating positive displacement pumps rated below 150 psig
- ✓ Centrifugal pumps so designed that system maximum allowable working pressure cannot be exceededCorrect
- C. Gear pumps with integral pressure bypass valves
- D. Diaphragm pumps operating on non-flammable fluids
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. No similar exception is provided for reciprocating, gear, or diaphragm pumps in the supplied text.
Cited:46 CFR §56.07-10