When inspecting a tanker vehicle before driving, which component unique to tankers must be checked?

TANKER-SPECIFIC INSPECTION ITEMS go beyond the standard pre-trip because liquid or gas cargo introduces hazards that solid freight does not. WHAT TO CHECK: MANHOLE COVERS — must be properly closed and latched; an open or loose manhole cover during transport allows spills, contamination, and entry of debris; VENTS — must be the correct type for the commodity and operating properly; over-pressurization and vacuum must be managed; EMERGENCY SHUTOFF VALVES — close instantly when activated; must move freely and seal completely; INLET AND DISCHARGE VALVES — must be in the correct position (closed during transport, open only during loading/unloading); VAPOR RECOVERY VALVES — important for petroleum products to prevent atmospheric release; TANK SHELL — check for dents, bulges, cracks, or corrosion that could indicate structural weakness; CONNECTIONS AND HOSES — look for leaks at any fitting; SAFETY EQUIPMENT — appropriate to the commodity being transported (different requirements for flammable liquids vs. food-grade vs. corrosives); TANK CAPACITY AND LOAD PLANNING — verify the product density and total weight comply with axle weight limits; dense liquids (like some chemicals) can exceed gross weight limits before the tank appears full.