When a gas leak occurs, immediate action is critical. If you smell gas, never touch electrical switches. Open windows for ventilation and evacuate immediately. Follow the step-by-step guide below.
How to Detect a Gas Leak
Early detection is the first step in preventing a gas accident. City gas (LNG) has a distinctive rotten-egg odor (from added odorant), while LP gas (propane/butane) has its own characteristic smell. Watch for these warning signs:
- Persistent unexplained gas smell indoors
- Gas stove flames burning orange or red instead of blue
- Gas meter readings increasing with no usage
- Hissing sounds near pipes or valves
⚠️ Important Note
Carbon monoxide (CO) is colorless and odorless — it cannot be detected by smell. Always install a CO detector in rooms with gas boilers.
5 Immediate Actions When a Gas Leak Is Suspected
If you suspect a gas leak, follow these steps calmly and in order. Skipping or reordering steps increases the risk of explosion or fire.
- 1 Shut off the gas supply: Close the stove cock, intermediate valve, and meter valve in that order.
- 2 Do NOT touch electrical switches: Do not turn on or off any lights, fans, or outlets. Sparks can ignite the gas.
- 3 Open windows and doors for ventilation: Open all windows and doors as quickly as possible. Use natural ventilation only — do not turn on fans.
- 4 Evacuate immediately: Take everyone in the building outside. Use stairs, not elevators.
- 5 Call emergency services and your gas company: Once outside, call 119 (Korea emergency) and notify your gas supplier immediately.
LNG vs. LP Gas: Key Differences in Leak Behavior
Understanding how different types of gas behave when leaking helps you respond faster and more safely.
| Property | City Gas (LNG) | LP Gas (Propane/Butane) |
|---|---|---|
| Main component | Methane (CH₄) | Propane / Butane |
| Density vs. air | Lighter (rises upward) | Heavier (settles at floor) |
| Ventilation priority | Open ceiling-level windows first | Open floor-level openings first |
| Lower explosive limit | 5% | 2.1% (more dangerous) |
📞 Emergency Contacts (Korea)
Gas leak emergency: 119 | Korea Gas Safety Corporation: 1544-4500