USCG Exam PracticeLube oil and fuel oil systems
Power-operated shutoff valves on oil tanks are required to meet specific regulatory standards. Which of the following correctly states a requirement for the emergency manual operation of such valves?
- A. Emergency manual operation is required only for valves located inside the tank and need not be provided for externally mounted valves
- ✓ The valve must be provided with a means of emergency manual operation to both open and close the valve regardless of the status of the power operating system, with instructions conspicuously posted at the valveCorrect
- C. Emergency manual operation is required to close the valve only; remote power actuation is the sole means required for opening
- D. The energy storage system for fluid power actuated valves may be cross-connected to the emergency manual system to satisfy both requirements simultaneously
Why B is correct
46 CFR §56.50-60(d)(3)(iv) requires that power-operated valves be provided with a means of emergency manual operation to both open and close the valve regardless of the status of the power operating system, and that instructions and warnings regarding the emergency system be conspicuously posted at the valve. The regulation does not limit emergency manual operation to closing only, nor does it exempt externally mounted valves.
Cited:46 CFR §56.50-60