🔍 Key Concepts

• heat transfer and fouling in fuel oil heaters • effect of velocity/flow rate on deposit build‑up inside tubes • what factors directly vs indirectly influence fouling on the oil side

💭 Think About

• Which of these options would most directly change how fast deposits can settle and stick to the oil‑side surfaces inside the heater? • If you increase that factor, would you expect fouling to increase or decrease? Why? Think in terms of scouring vs. settling. • Which choices deal with conditions on the steam side or mechanical design, rather than what is happening right at the oil‑side surface where fouling occurs?

✅ Before You Answer

• Identify which choice most clearly affects oil velocity/turbulence inside the heater passages. • Separate factors that influence the steam side from those that act on the oil side of the heater. • Ask: if this factor doubles, does it logically reduce the chance of deposits sticking on the oil‑side surfaces?