What is the purpose of the mixing tank shown...

🔍 Key Concepts

• Location of the mixing tank in relation to the main engine supply and return lines • What happens to hot return fuel from the engine during changeover from HFO (heavy fuel oil) to DO (distillate oil) • How a vent line and moisture trap work compared to the main reason for having a mixing/buffer tank

💭 Think About

• Trace the flow of fuel from the service tanks, through the heaters and engine, and back to the mixing tank—what must be controlled during this loop? • During a rapid switch from hot heavy fuel to cold distillate, what could happen to pumps, injectors, and pipes if the temperature (and viscosity) changed suddenly? • Is venting and day-tank protection the primary design purpose of this tank, or side effects of how it is arranged in the system?

✅ Before You Answer

• Confirm which lines are connected to the mixing tank (engine return, booster pump suction, vents) in the illustration • Decide what single problem would be most serious for the fuel system if the mixing tank were removed entirely • Check whether preventing vapor venting or day tank overheating requires a dedicated tank, or if these could be solved more simply without a mixing tank

What is the purpose of the mixing tank shown in the illustration? Illustration MO-0058

To permit vaporized lighter fuel fractions to vent

To prevent overheating of the day tank

To enable the changeover from hot heavy fuel to cold distillate fuel to occur gradually

All of the above

🔍 Key Concepts

💭 Think About

✅ Before You Answer