🔍 Key Concepts

• Overflow prevention during fuel transfer operations • The purpose and limitations of high-level alarms • Using direct level measurements (sounding/ullaging) versus relying on time estimates

💭 Think About

• Which option gives you continuous, positive control of the actual fuel level in the tank, instead of depending on an automatic device or a guess? • What might happen if the alarm fails, or if the transfer rate is different from previous transfers—would that method still protect against a spill? • As a tank nears full, do you generally want to increase or decrease how closely you monitor the level to prevent an overflow?

✅ Before You Answer

• Verify which method relies on actual measurement of tank level rather than assumptions or history. • Check which choice does not depend on a single device (like one alarm) that could fail silently. • Consider which option requires you to stop before the tank is completely full, leaving a safe margin for expansion and surge.