Which action is essential to prevent ignition hazards when handling gases on a diving site?

• A. Keep open flames near storage for warmth.
• B. Rely on a single gas detector.
• C. Allow smoking in the gas area.
• D. No open flames present; ensure ventilation and monitoring.

Answer: (D)

Preventing ignition hazards with gases is all about removing ignition sources and controlling the environment. Gases used on a diving site can be flammable, so any open flame or spark near storage or handling areas must be eliminated. Keeping the area well ventilated helps disperse leaked gas, lowering the chance of reaching a flammable concentration, while continuous monitoring provides early warning of leaks so corrective action can be taken quickly. The other options create or ignore risks: open flames near storage, smoking in the gas area, or relying on a single detector can all fail to prevent ignition. So the safest, most effective approach is no open flames present combined with good ventilation and ongoing monitoring.