Question 1271 Deck General

The correct answer is D) safety relief valves. According to the regulations, cargo tanks containing liquefied flammable gases (LFG) are fitted with safety relief valves to prevent excessive pressure buildup. These valves are designed to automatically open at a predetermined pressure to release the excess pressure and prevent tank rupture or failure. This is a critical safety feature required by the regulations to ensure the safe handling and transportation of LFG cargoes. The other options are incorrect because: A) flame screens are not used for pressure relief, B) excess flow valves are used to prevent excessive flow in the event of a line rupture, and C) pressure vacuum relief valves are used to allow air/vapor exchange during loading and unloading, not for pressure relief.