How should cargo tank hatches be protected...

Question 1 / 2707066636ee728f7522a1c51761e

Question 1 of 2707066636ee728f7522a1c51761e

How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?

Question 1 of 27070

How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?

🔍 Key Concepts

• Gas freeing and why it matters for cargo tanks • Purpose of ullage openings during loading/discharging • Functions of gooseneck vents, warning signs, flame screens, and PV (pressure-vacuum) valves on tankers

💭 Think About

• Which device is specifically intended to reduce the risk of ignition when vapors can escape from an opening? • When the ullage opening is open on a tank that is not gas free, what is the main hazard you are protecting against? • Among the choices, which ones control pressure, which warn people, and which actually address flame or ignition sources at an opening?

✅ Before You Answer

• Identify which option is designed to stop flame propagation through an opening • Confirm which devices are for pressure control versus fire/explosion protection • Consider which option is applied at or over an opening that may emit flammable vapors

Question 1 of 27070

How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?

With gooseneck vents

With warning signs

With flame screens

With pressure-vacuum relief valves