Question 156Safety & Environmental - 1st Asst/Chief

The correct answer is B) calibrate the gas leak detectors. Span gas, which is a known calibration gas, is used aboard liquefied natural gas (LNG) carriers to calibrate the gas leak detectors. This is necessary to ensure the proper operation of the leak detection system, which is a critical safety feature on LNG vessels. The other answer choices are incorrect because span gas is not used to detect leaks directly (A), odorize the cargo (C), or inert the barrier spaces (D). Those functions are performed by other systems and components on an LNG carrier.