Originally steam ship f/o service and settling tanks were designed with only a high suction and a low suction and no other valves. What was the purpose of the low suction?
• Low vs high suction arrangements in fuel oil (f/o) service and settling tanks • Behavior of water, sludge, and sediment in fuel oil tanks • How early steam ship fuel transfer systems handled contamination without extra valves
• Think about where water and sludge tend to accumulate in a fuel oil tank and which suction (high or low) would reach that area. • Consider what problem engineers were trying to solve if they only had two suction levels and no extra valves or drains. • Ask yourself in normal and rough weather, which suction line would be used for day‑to‑day fuel supply and which would be used only when needed for a specific maintenance or cleanliness purpose.
• Verify what collects at the bottom of fuel oil tanks over time and why. • Consider which suction (high or low) would normally be used for cleaner fuel to engines. • Check which option clearly relates to dealing with contaminants (water/sludge) rather than fuel quantity or pump performance.
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