Since towing vessels take on fresh water from shore as a source of make-up water for the closed, re-circulating cooling water systems supporting diesel engines, what property of the make-up water is most important in contributing to cooling system problems?
• Closed, re‑circulating cooling water systems and how they concentrate certain substances over time • Differences between suspended solids (like sand) and dissolved solids (like minerals in hard water) • How scale, corrosion, and fouling typically develop inside engine cooling passages
• In a closed cooling system that keeps reusing the same water, what happens to materials that do NOT evaporate out with the water? • Which type of contamination is most likely to form hard deposits on heat‑transfer surfaces and inside small cooling passages? • Which option would gradually reduce heat‑transfer efficiency and be hardest to remove once it builds up?
• Distinguish clearly between suspended versus dissolved materials in the water • Think about which contaminant will accumulate and harden on hot metal surfaces as the system operates • Consider which factor cooling‑water treatment chemicals are most commonly designed to control in diesel engine systems
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