Which of the following is a crucial safety measure on LNG ships regarding cargo?

Regular leak testing is a crucial safety measure on LNG (Liquefied Natural Gas) ships regarding cargo because it ensures that any potential leaks in the cargo containment systems are detected and addressed promptly. LNG is stored at very low temperatures, and any leaks can lead to the release of gas, which poses serious safety risks, including explosive hazards. By performing routine leak tests, personnel can verify the integrity of the containment systems and ensure that the ship operates safely without the risk of gas escaping into the environment.

Monitoring the temperature closely does contribute to safety; however, it primarily helps in maintaining the LNG in its liquid state. Simply ensuring gas is never freed or always keeping tanks full are not practical guidelines for safety, as there will be instances where gas is intentionally vaporized for various operational needs. Regular leak testing, therefore, is the proactive approach to preventing incidents and ensuring the safety of the crew, ship, and the environment.