🔍 Key Concepts

• Tank venting systems on tankers and barges • How enclosed tanks respond to temperature changes and cargo transfer (loading/discharging) • Difference between line pressure control and tank atmosphere control

💭 Think About

• When cargo is loaded into or discharged from a tank, what happens to the air/vapors in that enclosed space? • What problem could occur if a tank cannot breathe in or out as pressure changes? Think about both overpressure and vacuum. • Which choices deal with controlling conditions inside the tank versus controlling flow in pipelines or pumps?

✅ Before You Answer

• Identify which answer choices refer to pump or pipeline performance rather than tank safety. • Decide which option mentions both pressure AND vacuum, since enclosed spaces can experience either during cargo operations. • Ask yourself: which function is directly related to preventing structural damage or rupture of a closed tank due to pressure changes?