The only ignition sources on tank ships and barges for starting fires are open flames and sparks.

• A. True
• B. False
• C. Sometimes
• D. Not applicable

Answer: (B)

Ignition sources on tank ships and barges include more than just open flames and sparks. Any energy source capable of igniting a flammable vapor–air mixture must be controlled, so hazards come from static electricity, hot surfaces, electrical equipment that can arc or overheat, and mechanical sparks from moving parts or metal-to-metal contact. Hot work like welding or grinding, as well as radiant heat from nearby equipment, can also ignite vapors. External sources such as lightning or heat transfer from nearby fires can contribute as well. Because these ships carry volatile cargo, safety practices target all potential ignition sources, using grounded bonding for static control, intrinsically safe or explosion-proof equipment, proper ventilation, inerting when needed, and strict hot-work controls.