🔍 Key Concepts
• Function of a lube oil settling tank in a steam plant (where dirty oil sits so water and sludge can separate by gravity before purification).
• Piping clues on the diagram: look for connections to the purifier / separator, and to a sludge tank or drain coming from the same tank.
• Physical location and fittings: settling tanks are usually above the purifiers, fitted with heating coils and drains from the bottom to remove water and sludge.
💭 Think About
• On the diagram, which labeled tank is connected so that oil can flow from it to the purifier or separator and also down to a sludge or drain line?
• Compare items A, B, C, and K: which one is drawn as a larger storage-type tank whose job would reasonably be to hold contaminated lube oil for a period of time, rather than to act as a sump, day tank, or heater?
• Look at the text and arrows around each labeled item: which one has indications of heating, venting, and sludge/water drains typical for a settling tank?
✅ Before You Answer
• Confirm that the tank you pick is not the main lube oil sump or drain tank but a separate tank feeding the cleaning system.
• Verify that the selected item has a piping line leading toward the purifier/separator section of the diagram.
• Check for a bottom connection labeled to a sludge tank, drain, or bilge, which is characteristic of a settling tank.