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 which materials, and what dual means of operation is required?
- ✓ Steel, ductile cast iron ASTM F1155, or a ductile nonferrous alloy with melting point above 1,700 °F; with both local manual control at the valve and remote control from a safe location outside the compartmentCorrect
- B. Cast iron or ductile iron; with remote control only from outside the machinery space
- C. Steel or copper alloy with melting point above 1,000 °F; with local manual control only
- D. Steel, ductile cast iron ASTM F1155, or a ductile nonferrous alloy with melting point above 1,700 °F; with remote control only, local control being prohibited for safety
Why A is correct
46 CFR §56.50-60(d)(1) specifies that outside-tank shutoff valves must be steel, ductile cast iron ASTM F1155, or a ductile nonferrous alloy with a melting point above 1,700 °F, and must have both local manual control at the valve and remote control from a readily accessible safe location outside the compartment. Option B describes the inside-tank valve provision under §56.50-60(d)(2), which permits cast iron and remote-only control.
Cited:46 CFR §56.50-60