🔍 Key Concepts

• Interface level between oil and water inside the bowl and how it is controlled by the gravity disk size • Effect of throughput (feed rate) on separation efficiency in a purifier centrifuge • Purpose of operating at a relatively high separating temperature for fuel oil cleaning

💭 Think About

• Look at the illustration and identify where the oil/water interface would sit in the disk stack and which component fixes that position. • Ask yourself: which option would actually move the oil/water interface so close to the clean oil outlet that water could pass out with the oil, even if the machine is otherwise operating correctly? • Consider which options would mainly change the rate of separation versus which would change the location of the interface inside the bowl.

✅ Before You Answer

• Be clear on which part in the figure represents the gravity disk / pairing disk and which side is the clean oil outlet versus the water outlet. • Verify what happens to the interface if the gravity disk is too large versus too small for a given oil density and temperature. • Confirm that 95°C (203°F) is a typical temperature used to improve separation of fuel oil, not to worsen it, and that a partially closed clean oil valve affects flow/pressure, not the basic separation boundary.