USCG Exam PracticeLube oil and fuel oil systems
Under 46 CFR §56.50-60, a power-operated shutoff valve on a fuel oil tank is fitted with both local and remote power actuators. The local power actuator is used to open the valve. Which of the following statements correctly describes the regulatory requirement for the remote actuator in this condition?
- A. The remote actuator is locked out whenever the local actuator has been used, and must be reset at the valve before remote operation is restored.
- ✓ The positioning of the valve by the local power actuator must not void the ability of the remote power actuator to close the valve.Correct
- C. The remote actuator may only close the valve after the local actuator has returned to its neutral position.
- D. The energy storage system for the remote actuator must be recharged before the remote actuator can close the valve following local operation.
Why B is correct
46 CFR §56.50-60(d)(3)(iii) requires that positioning of the valve by either the local or remote power actuators must not void the ability of the other actuator to close the valve. This ensures that remote emergency closure capability is always maintained regardless of local actuator status.
Cited:46 CFR §56.50-60