Under fire conditions, what is not an indicator preceding a rupture of a compressed gas tank?

Under fire conditions, what is not an indicator preceding a rupture of a compressed gas tank?

• A. A change in the position of the tank
• B. Hissing sound from a valve
• C. Cracking or popping noises
• D. Bulging seams

Answer: (A)

Under fire conditions, a compressed gas tank will show warning signs that the internal pressure is pushing the vessel toward failure. A hiss from the valve means gas is escaping as the relief device vents; cracking or popping noises indicate the metal or seams are yielding under heat or pressure; bulging seams reveal the wall is deforming because of internal pressure. These signs directly reflect internal stress and imminent rupture. A change in the tank’s position isn’t a reliable warning because movement can result from external forces, shifting ground, or the tank being bumped, and it doesn’t reliably indicate that the tank is about to fail.

Under fire conditions, a compressed gas tank will show warning signs that the internal pressure is pushing the vessel toward failure. A hiss from the valve means gas is escaping as the relief device vents; cracking or popping noises indicate the metal or seams are yielding under heat or pressure; bulging seams reveal the wall is deforming because of internal pressure. These signs directly reflect internal stress and imminent rupture. A change in the tank’s position isn’t a reliable warning because movement can result from external forces, shifting ground, or the tank being bumped, and it doesn’t reliably indicate that the tank is about to fail.