Image source: ETtoday
“Another gas explosion.”
Whenever these words appear in the news, they are often followed by terrifying images of collapsed buildings, shattered walls, and flames rising into the sky.
You may have opened this article because you recently saw another gas explosion in the news, because your home gas pipeline was just replaced, or simply because you want to know one thing:
Is my home truly safe?
These disasters can destroy homes and take lives in an instant. But are they really just unfortunate accidents? Or are they preventable human-made disasters hidden in pipelines, gas appliances, and even our daily habits?
This guide has one purpose: to help you understand what gas explosions are, why they happen, how to prevent them, and how to protect yourself and your family.
1. What Is a Gas Explosion? An Invisible Fuel Out of Control
A gas explosion is a type of chemical explosion. Chemical explosions can generally be divided into detonation and deflagration.
In a detonation, the flame front can travel faster than the speed of sound, producing shock waves and massive destructive force. This is commonly associated with explosives or military bombs.
A gas explosion usually belongs to the category of deflagration. Gases, dust, and even gunpowder in bullets can all burn through deflagration. Although the flame propagation speed is slower than detonation, and deflagration does not typically produce the same kind of shock wave, gas explosion scenes can still look devastating.
Why?
Because high-temperature burning gas expands violently. The pressure created by this expansion can be amplified by gas concentration and enclosed spaces. Under the right conditions, flame speed may accelerate and create intense combustion and destructive pressure waves.
So what actually causes a gas explosion?
Key Concept: The Explosion Pentagon
An explosion is essentially an upgraded version of the “fire triangle.”
Most people know that fire requires three basic elements:
- Fuel — natural gas, LPG, or other flammable gases
- Oxidizer — oxygen
- Heat — an ignition source
However, an explosion requires two additional critical conditions:
4. Dispersion
The gas and air must be mixed evenly enough to form a mixture within the explosive concentration range. If the gas concentration is too low or too high, it will not explode.
5. Confinement
This is what gives an explosion its destructive “blast” effect.
Indoors, high-pressure gas produced by combustion becomes trapped and cannot be released quickly. Pressure builds up and creates a destructive impact. This is also why explosions near hard walls or solid surfaces can become much more powerful due to reflected pressure waves.
Explosions occurring near or inside hard solid surfaces can be amplified by reflected shock waves, increasing intensity by 2 to 9 times. As a result, people located between the blast center and a building may suffer injuries that are 2 to 3 times more severe than those in open areas.
Together, these five conditions form the Explosion Pentagon.
Image source: Internet
Why Can One Tiny Spark Cause an Explosion?
The natural gas and LPG used in daily life are naturally colorless and odorless. For safety reasons, gas suppliers add an odorant, usually mercaptan, so people can detect leaks through a “rotten egg” smell.
In most cases, a gas explosion does not happen immediately. Instead, gas leaks slowly and accumulates in low areas or ceiling corners, depending on the type of gas.
Dangerous Concentration Ranges
- Natural gas, mainly methane: 5% to 15%
- LPG, liquefied petroleum gas: 1.9% to 9%
Once gas builds up to a dangerous explosive concentration, even a tiny spark from switching an electrical appliance on or off can ignite the mixture and trigger a devastating explosion.
Image source: Citizen of the Earth, Taiwan
2. The Deadly Threat of Gas Explosions: Five Types of Blast Injuries
Gas explosions are especially dangerous because the damage they cause can affect the human body in several ways at once, resulting in complex injuries.
1. Blast Wave Injuries
The intense pressure wave created by an explosion can easily damage hollow organs in the body, including:
- Eardrums: perforation and hearing loss
- Lungs: pulmonary contusion, pneumothorax, or hemothorax
- Intestines: perforation and internal bleeding
Blast wave injuries often leave no obvious external wounds. A person may appear unharmed on the outside while suffering life-threatening internal injuries, especially to the brain and lungs.
Traumatic brain injury and lung injury are often major causes of delayed death among explosion survivors.
2. Fragmentation Injuries
Explosion fragments, such as glass or metal, can fly at high speed and cause puncture wounds, lacerations, and fractures.
These are among the most visible and common external injuries. However, fragments may remain inside the wound. If they are not properly removed and treated, they may later cause infection or loss of function.
3. Impact Injuries
The force of rapidly expanding gas can throw a person several meters, or even dozens of meters, into walls, vehicles, or the ground.
This may cause concussion, fractures, internal organ rupture, and other major trauma. It is also one of the key causes of mass casualties in explosion incidents.
4. Burns and Other Injuries
Gas explosions are often accompanied by extreme heat and flames, which may cause burns and inhalation injuries.
Other possible injuries include eye damage and crush syndrome caused by structural collapse at the scene.
5. Chemical, Biological, or Radiological Contamination
Some explosions may also involve the release of chemical, biological, or radiological substances, leading to unexplained fever, shock, immune system abnormalities, and other symptoms among survivors.
This type of blast injury is relatively rare and remains a topic of medical discussion and research. It is usually associated with special explosion events, such as terrorist attacks, rather than ordinary gas explosions.
Invisible Wounds: Psychological Trauma
In addition to physical injuries, gas explosion survivors may also experience long-term psychological trauma.
Common aftereffects include post-traumatic stress disorder, anxiety, and depression.
This is why treating gas explosion victims can be extremely complex. They are not only facing immediate injuries, but also a long and difficult road to recovery.
Image source: The New England Journal of Medicine
3. Overlooked Gas Explosion Risks
Like many fires, gas explosions are rarely sudden accidents. They are often the result of accumulated risks and repeated negligence.
One of the most common thoughts people have is:
“It probably won’t happen to my home.”
But hidden risks may already be present:
- Gas hoses that have been used for more than five years without replacement
- Aging connectors that are never inspected
- Poor kitchen ventilation or heavy grease buildup
- Electrical wiring and gas pipelines installed too close together during renovation
Never rely on luck when it comes to gas safety. Once a gas explosion occurs, the consequences are often more than anyone can bear.
Looking back at the Kaohsiung gas explosion that shocked Taiwan, long-term corrosion and poor management of industrial pipelines led to a tragedy that claimed 32 lives.
In the Taichung department store gas explosion incident, the main gas valve was not shut off, and pipeline damage caused during construction led to the explosion.
History continues to remind us of the heavy cost of neglecting public safety.
Image source: PTS
4. Prevention First: From Daily Safety to Emergency Response SOP
“Prevention is better than cure” is especially true for gas explosions.
Once a gas explosion happens, the cost of rescue, treatment, and recovery can be unimaginably high.
Below are key steps for preventing gas explosions, responding to gas leaks, and taking action after an explosion.
① Gas Equipment Installation and Maintenance
Correct installation and regular inspection are the first steps in preventing gas leaks.
Make sure gas cylinders are placed outdoors in a well-ventilated area. Check that pipelines are not cracked or aging, that connectors are securely fixed, and that all gas appliances and accessories are certified and compliant.
Replace gas hoses regularly, clean gas stoves, and keep combustion stable and safe.
② Build Safe Gas-Use Habits
Always remember this principle:
When people leave, the flame must go out.
Keep the kitchen ventilated while cooking. Prevent soup or liquid from overflowing and avoid letting wind blow out the flame.
Do not install gas water heaters inside bathrooms. Make sure water heaters have proper exhaust ventilation and are inspected every six months to reduce the risk of carbon monoxide poisoning.
③ Gas Leak SOP: Remember “Do Not, Shut Off, Open, Leave”
According to Taiwan’s National Fire Agency, the gas leak response can be remembered with four key actions:
Do not turn any electrical appliance on or off.
Do not turn lights on. Do not turn lights off. Do not turn on the range hood. Any tiny spark could become an ignition source.
Immediately shut off the main gas valve or gas cylinder valve.
Slowly open the windows to allow ventilation. Avoid sudden or forceful movements that may cause friction or sparks.
Leave the area quickly. Once you are outdoors in a safe location, call 119 for emergency assistance.
Image source: Ministry of the Interior
④ Install Detection and Alarm Devices
Human senses have limits.
When we are asleep, when our sense of smell becomes fatigued, or when no one is home, a certified gas and carbon monoxide alarm is the only device that can provide 24-hour continuous protection.
However, correct installation is essential.
Natural Gas, NG, Methane
Natural gas is lighter than air and rises when it leaks.
Install the detector near the ceiling, within 30 cm of the ceiling.
LPG, Liquefied Petroleum Gas
LPG is heavier than air and accumulates near the floor.
Install the detector within 30 cm of the floor.
A two-in-one gas and carbon monoxide detector is one of the safest choices. It provides dual protection in one device.
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Dual Detection with Real-Time Display
Whether the danger is carbon monoxide from incomplete combustion or leaking gas, such as LPG or natural gas, the detector can identify the threat and display the concentration on screen.
When harmful gas concentration becomes too high, the detector immediately sounds an 85 dB alarm at 3 meters, helping people notice the danger quickly even in noisy environments.
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Certified in Taiwan and the United States
In addition to approval from Taiwan’s fire safety authority, the product has also obtained UL safety testing certification from the United States, providing stronger safety assurance.
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Five-Year Warranty and Product Liability Coverage
The product comes with a five-year original manufacturer warranty and product liability insurance coverage of up to USD 10 million, offering greater peace of mind.
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Easy Installation and Flexible Use
The device is easy to use. Simply plug it in or install batteries to operate. With a sliding bracket and a 1.8-meter extension cord, it can be placed near a bedside or mounted securely on a wall.
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Clear Status Indicator Lights
Bright LED indicators clearly show the working status of the alarm.
⑤ After a Gas Explosion: Do Not Rush to Extinguish the Fire
Please note that the “Do Not, Shut Off, Open, Leave” SOP applies to gas leaks.
If a gas explosion has already occurred, the response principles are completely different.
Evacuation Comes First
After a gas explosion, do not rush in with a fire extinguisher.
The first priority is to determine whether the building structure is stable and whether there is an immediate risk of collapse.
Leave Immediately If the Situation Is Unclear
If you cannot confirm whether the gas leak has stopped or whether a second explosion may occur, evacuate to a safe location immediately.
Leave It to Professionals
Call 119 immediately. Fire suppression, search, and rescue should be handled by professionally trained firefighters.
Is Using a Fire Extinguisher Immediately After a Restaurant Gas Explosion Really the Safest Choice?
In a gas explosion, the safest action is not always to fight the fire immediately.
If the explosion has already occurred, the environment may still contain leaking gas, unstable structures, secondary explosion risks, or hidden ignition sources. In this situation, evacuation and emergency reporting are far more important than attempting to extinguish the fire yourself.
5. Conclusion: From Fear to Action
The scars left by disasters are not only broken walls and collapsed buildings. They are also the fear that survivors may carry for the rest of their lives.
We cannot simply wait for the next breaking news alert.
Every gas explosion is a painful lesson written in lives and loss.
After reading this guide, you now have a more complete understanding of gas explosion prevention and emergency response than most people. The next step is to turn knowledge into action.
Today, check your home gas hose. Confirm your water heater ventilation. Review whether your gas and carbon monoxide detector is installed in the correct location.
Improving emergency preparedness is a responsibility we owe to ourselves, to our families, and to those who have lost their lives in disasters.
