USCG Exam PracticeLube oil and fuel oil systems
Under 46 CFR §56.50-60(d)(1), shutoff valves installed on the outside of oil tanks must be made of approved materials and must be arranged for both local and remote manual control. If a power-operated valve is installed to meet this requirement, which of the following statements correctly describes the emergency manual operation requirement?
- A. Emergency manual operation is required only for closing; remote power operation is sufficient for opening
- ✓ Emergency manual operation to both open and close the valve must be provided regardless of the status of the power operating system, and if it interferes with power operation it must be protected and posted with instructionsCorrect
- C. Emergency manual operation is not required provided the energy storage system has capacity to cycle all valves twice from any initial position
- D. Emergency manual operation to close only is required; opening against spring pressure is considered sufficient for emergency purposes
Why B is correct
46 CFR §56.50-60(d)(3)(iv) requires that power-operated shutoff valves be provided with a means of emergency manual operation to both open and close the valve regardless of the power system status. If that manual operation interferes with power operation, it must be protected by covers, locking devices, or similar means, and instructions and warnings must be conspicuously posted at the valve.