USCG Exam PracticeLube oil and fuel oil systems
Under 46 CFR §56.50-60, which of the following is a correct statement regarding valves installed on the OUTSIDE of oil tanks that are subject to internal head pressure?
- A. They may be made of cast iron and arranged for remote control only.
- ✓ They must be made of steel, ductile cast iron ASTM F1155, or a ductile nonferrous alloy with a melting point above 1,700 °F, and must have both local and remote manual control.Correct
- C. They must be made of nonferrous material and may be arranged for local control only.
- D. They may be made of any approved material provided a remote emergency shutoff is fitted outside the machinery space.
Why B is correct
46 CFR §56.50-60(d)(1) specifies that valves installed on the outside of oil tanks must be made of steel, ductile cast iron ASTM F1155, or a ductile nonferrous alloy with a melting point above 1,700 °F, and must be arranged for manual control both locally and remotely from a safe location outside the compartment. Cast iron with remote control only applies to valves installed on the inside of the tank per §56.50-60(d)(2).
Cited:46 CFR §56.50-60